self-contained interoperable controller model ucp-1 · caution: this symbol is intended to alert...

© 2015 Taco Electronic Solutions, Inc. 1

Application Guide 505-052

DXUV Single Zone VAV ControllerSelf-Contained Interoperable Controller Model UCP-1

SUPERSEDES: April 18, 2016 EFFECTIVE: April 26, 2016Plant ID: 001-4211

Table of Contents

DXUV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Purpose of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . 4

Representations and Warranties . . . . . . . . . . . . . . . . . 4

Applicable Documentation . . . . . . . . . . . . . . . . . . . . . . 4

Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . 5General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Static Electricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5FCC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Before Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6About this Document . . . . . . . . . . . . . . . . . . . . . . . . 6Inspecting the Equipment . . . . . . . . . . . . . . . . . . . . 6What is Not Included with this Equipment . . . . . . . . 6Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . 6Selecting a Power Source . . . . . . . . . . . . . . . . . . . . 6

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Mounting the Device . . . . . . . . . . . . . . . . . . . . . . . . 7Routing Cabling to the Device . . . . . . . . . . . . . . . . . 8Grounding the Device . . . . . . . . . . . . . . . . . . . . . . . 8

Wiring Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Connecting Input Devices . . . . . . . . . . . . . . . . . . . 11Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Other Connections . . . . . . . . . . . . . . . . . . . . . . . . . 13

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Electrical Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Electrical Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . 14Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Recommended Sensor Wire . . . . . . . . . . . . . . . . . 15Recommended LON Bus FTT-10A Network Wire . 15Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Application Description . . . . . . . . . . . . . . . . . . . . . . . . 16

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . 19Space Temp / RH Sensor Configuration . . . . . . . . 19Space Temperature Setpoints . . . . . . . . . . . . . . . . 20Supply Air Temperature Control . . . . . . . . . . . . . . 22Supply Air Heating and Cooling Sequence . . . . . . 23Modulated Stages . . . . . . . . . . . . . . . . . . . . . . . . . 25Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Fan Proof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Economizer Control . . . . . . . . . . . . . . . . . . . . . . . . 30Economizer Functions . . . . . . . . . . . . . . . . . . . . . . 31Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . 32Humidification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Hydronic Zone Interaction . . . . . . . . . . . . . . . . . . . 33Cutoff Temperatures . . . . . . . . . . . . . . . . . . . . . . . 34Indoor Air Quality (IAQ) . . . . . . . . . . . . . . . . . . . . . 34Smoke Detection . . . . . . . . . . . . . . . . . . . . . . . . . . 34Mixed Air Low Limit Detection . . . . . . . . . . . . . . . . 34Filter Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Real Time Clock (RTC) . . . . . . . . . . . . . . . . . . . . . 35Local Backup Schedules . . . . . . . . . . . . . . . . . . . . 35Runtime Accumulations . . . . . . . . . . . . . . . . . . . . . 35Alarms and Events. . . . . . . . . . . . . . . . . . . . . . . . . 35Outside Air Control Setup and Flow Rate Calibration36Automatic Configuration . . . . . . . . . . . . . . . . . . . . 37Communications . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Controller Identification . . . . . . . . . . . . . . . . . . . . . . . 40Network Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 52Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . 53

iWorx® DXUV

2 505-052, Effective: April 26, 2016 © 2015 Taco Electronic Solutions, Inc.

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iWorx® DXUV

505-052, Effective: April 26, 2016 3 © 2015 Taco Electronic Solutions, Inc.

DXUVThe DXUV Single Zone VAV controller is designed as a single zone controller capable of supplying conditioned air to a Space. It can alternately be associated to a BZU3 and provide conditioned air to multiple spaces.

OverviewDigital inputs are provided for fan status, mixed air low limit status, smoke detector and filter status. Analog inputs are provided for supply, return and mixed air temperatures. Indoor Air Quality may be defined by the user as analog or dig-ital. Zone temperature and humidity may be sensed by a two wire serial interface to an iWorx TS300 series thermostat. An analog (0-10V) input is provided for differential pressure for reading air flow rate. The same DP input may be alter-natively configured as a flow or velocity input.

Zone temperature and zone humidity are sensed by a two-wire serial interface to an iWorx® TS302/TS304/TS306 ther-mostat. Alternatively, the controller may be associated with a BZU3 with zone temperature, setpoints, hvac mode and fan mode communicated from the BZU3. When the DXUV is associated to a BZU, the DXUV’s stat input may be con-figured as a space humidity input. If dehumidification isn't used and the Free Cooling type is not configured to Rtn Air Humidity, then the STAT input may also be configured for a thermistor input (TS100).

The controller incorporates digital output triacs for fan enable, two stages of heating, two stages of cooling, a humidifier and dehumidification reheat floating point valve (open/close). In addition, analog outputs are provided for a modulating fan, modulating economizer and modulated heating and cooling.

The DXUV is based on the LONWORKS® networking technology. The controller can be networked to a higher-level con-trol system for monitoring and control applications.

Features• Space temperature controlled by fan modulation with fan enable• Modulated economizer minimum position and flow rate• Two stages of cooling, or a floating point cooling valve, or a modulated cooling valve• Two stages of heating, or a floating point heating valve, or a modulated heating valve• One heating stage and one cooling stage may be designated as a modulating stages• Heating and cooling setpoints defined by outside air temperature reset curve• Humidification• Dehumidification with heat, Dehumidification with reheat• Economizer enabled based on enthalpy or dry bulb calculations• Optional calibration of air flow (differential pressure) sensor• Runtime accumulation for heating, cooling and fan• Individual temperature setpoints for occupied/unoccupied heat and cool• Time proportioned control of the staged outputs to reduce cycling• Proportional + Integral control of the modulated fan and modulated heating and cooling• Thermostat with space temperature, space humidity, setpoint adjust, fan override, occupancy override• Supports association with BZU3 Hydronic Zone Controller• Local backup schedule• Minimum cycle timer• Mixed air low limit protection• Filter status, fan proof, and smoke detection inputs• Fan control energized on call for heating or cooling• IAQ compensation based on IAQ input• Outside Air Temperature Cutoffs• Supply Air Temperature cooling limit

iWorx® DXUV


• Automatic heat/cool changeover• Automatic configuration with the LCI• Alarm/Event reporting• Real-Time Clock• LONWORKS® interface to building automation systems

PURPOSE OF THIS GUIDEThe iWorx® DXUV Application Guide provides application information for the DXUV Controller.

The reader should understand basic HVAC concepts, intelligent environmental control automation, and basic LON-WORKS networking and communications. This Guide is written for:

• Users who engineer control logic• Users who set up hardware configuration• Users who change hardware or control logic• Technicians and field engineers

REPRESENTATIONS AND WARRANTIESThis Document is subject to change from time to time at the sole discretion of Taco Electronic Solutions, Inc. All updates to the Document are available at www.taco-hvac.com. When installing this product, it is the reader’s responsi-bility to ensure that the latest version of the Document is being used.

iWorx® products shall only be used for the applications identified in the product specifications and for no other pur-poses. For example, iWorx® products are not intended for use to support fire suppression systems, life support sys-tems, critical care applications, commercial aviation, nuclear facilities or any other applications where product failure could lead to injury to person, loss of life, or catastrophic property damage and should not be used for such purposes.

Taco Electronic Solutions, Inc. will not be responsible for any product or part not installed or operated in conformity with the Document and instructions or which has been subject to accident, disaster, neglect, misuse, misapplication, inade-quate operating environment, repair, attempted repair, modification or alteration, or other abuse. For further informa-tion, please refer to the last page of this Document for the company’s Limited Warranty Statement, which is also issued with the product or available at www.taco-hvac.com.

APPLICABLE DOCUMENTATIONTable 1: Applicable Documentation

Description Audience PurposeiWorx® DXUV Application Guide, Document No. 505-052 (this docu-ment)

– Application Engineers– Wholesalers– Contractors– Start-up Technicians– End user

Provides instructions for setting up and using the iWorx® DXUV.

iWorx® BZU3 Application Guide, Document No. 505-038

– Application Engineers– Installers– Service Personnel– Start-up Technicians– End user

Provides instructions for setting up and using the iWorx® BZU3 controller.

iWorx® DXUV


INSTALLATION INSTRUCTIONS

GeneralCAUTION: This symbol is intended to alert the user to the presence of important installation and mainte-nance (servicing) instructions in the literature accompanying the equipment.

CAUTION: Risk of explosion if battery is replaced by an incorrect type. Contains lithium type battery; dis-pose of properly.

WARNING: Electrical shock hazard. Disconnect ALL power sources when installing or servicing this equipment to prevent electrical shock or equipment damage.

Make all wiring connections in accordance with these instructions and in accordance with pertinent national and local electrical codes. Use only copper conductors that are suitable for 167 °F (75 °C).

Static ElectricityStatic charges produce voltages that can damage this equipment. Follow these static electricity precautions when han-dling this equipment.

• Work in a static free area.• Touch a known, securely grounded object to discharge any charge you may have accumulated.• Use a wrist strap when handling printed circuit boards. The strap must be secured to earth ground.

FCC ComplianceThis equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference. This equip-ment can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a par-ticular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.• Increase the separation between the equipment and the receiver.• Connect the equipment to a power source different from that to which the receiver is connected.

iWorx® LCI Application Guide, Doc-ument No. 505-002

– Application Engineers– Installers– Service Personnel– Start-up Technicians– End user

Provides instructions for setting up and using the iWorx® Local Control Interface.

http://www.iWorxWizard.com – Application Engineers– Wholesalers– Contractors

An on-line configuration and submittal package generator based on user input. Automatically generates bill of materials, sequence of operations, flow diagrams, wiring diagrams, points and specifications.

Additional Documentation LonWorks FTT-10A Free Topology Transceiver User’s Guide, published by Echelon Cor-poration. It provides specifications and user instructions for the FTT-10A Free Topology Transceiver. See also: www.echelon.com/support/documentation/manuals/transceivers.

Description Audience Purpose

iWorx® DXUV


• Consult the equipment supplier or an experienced radio/TV technician for help.

You are cautioned that any changes or modifications to this equipment not expressly approved in these instructions could void your authority to operate this equipment in the United States.

BEFORE INSTALLING

About this DocumentThe instructions in this manual are for the DXUV controller, which supports one multiplexed package unit.

Inspecting the EquipmentInspect the shipping carton for damage. If damaged, notify the carrier immediately. Inspect the equipment for damage. Return damaged equipment to the supplier.

What is Not Included with this Equipment• A power source for the equipment electronics and peripheral devices.• Tools necessary to install, troubleshoot and service the equipment.• The screws or DIN rail needed to mount the device.• Peripheral devices, such as sensors, actuators, etc.• Cabling, cabling raceway, and fittings necessary to connect this equipment to the power source, FTT-10A network

and peripheral devices.

Equipment LocationAbide by all warnings regarding equipment location provided earlier in this document.

Optimally, the equipment should be installed within a secure enclosure.

If the equipment is to be installed outside, it must be contained within a protective enclosure. The enclosure must main-tain internal temperature and humidity within the ranges specified for this equipment.

The equipment must be installed within 500 feet of all input peripherals (smoke detectors, sensors, etc.) that are con-nected to the equipment.

Selecting a Power SourceThis equipment requires a UL recognized Class 2 external power source (not supplied) to operate. The controller power input requires a voltage of 24 Volts AC.

To calculate power source current requirements, add the power consumption of all peripheral devices to that of the controller.

The controller and sensor power supplies can use the same power source. If both are using the same power source, the loads must have EMF protection. This protection can be integral to the load, or installed in the 24 VAC wiring across the load’s coil.

To provide necessary RFI and transient protection, the controller’s ground (GND) pin (T40) must be connected to earth ground or the earth ground of the packaged unit’s enclosure ground. Failure to properly ground the controller may cause it to exceed FCC limits. Excessive noise could also produce inaccurate sensor data. The power source must be capable of operating with this connection to ground.

iWorx® DXUV


INSTALLATIONWarning: Electrical shock hazard. To prevent electrical shock or equipment damage, disconnect ALL power sources to controllers and loads before installing or servicing this equipment or modifying any wir-ing.

Mounting the Device1.Select a mounting location. Enclosure mounting is recommended. 2.Hold the controller on the panel you wish to mount it on. With a marker or pencil mark the mounting locations on

the panel. 3.Using a small drill bit pre-drill the mounting holes. 4.Using two #6 pan head screws, mount the controller to the panel. 5.Wire the controller (See Routing Cabling to the Device).

iWorx® DXUV


Figure 1: Mounting Dimensions

Routing Cabling to the DeviceCabling used to connect the power source and cabling used to connect the FTT-10A network must remain separated within the control enclosure and wiring conduit.

Grounding the DeviceThe ground terminal (T40) must be securely connected to earth ground. Failure to properly ground this equipment will result in improper operation. Improper grounding may also increase the risk of electrical shock and may increase the possibility of interference with radio/TV reception.

For best performance, connect the power supply common terminal (T38) to the same external point as the ground terminal (T40).

iWorx® DXUV


WIRING INFORMATIONWARNING: Terminals 6, 9, 12, 15, 18, and 38 are connected internally on all DXUV controllers. Disconnect ALL power sources when installing or servicing this equipment to prevent electrical shock or equipment damage.

Figure 2: Typical DXUV Wiring - "BZU" Hydronic Zone Configuration

iWorx® DXUV


Figure 3: Typical DXUV Wiring - TS302, Power Sourcing Configuration

iWorx® DXUV


Figure 4: Typical DXUV Wiring - Precon III (TS100), Power Isolated Configuration

Connecting Input Devices

Differential Pressure (DP) To connect the Differential Pressure sensor to the controller, connect the positive wire from the sensor to DP (T19) and the other wire to the adjacent common (T18). The sensor must be a 0-10 Volt type.

Mixed Air Temperature (MAT)To connect the Mixed Air thermistor to the unit, attach one wire from the thermistor to MAT (T17) and the other wire to the adjacent common (T18).

iWorx® DXUV


Supply Air Temperature (SAT)To connect the Supply Air thermistor to the unit, attach one wire from the thermistor to SAT (T16) and the other wire to the adjacent common (T15).

Smoke Detect (SMK)This is a digital, dry contact style input. To connect the Smoke Detection sensor to the controller, connect one wire from the sensor to SMK (T14) and the other wire to the adjacent common (T15).

Filter (FIL)This is a digital, dry contact style input. To connect the Filter Status sensor to the controller, connect one wire from the sensor to FIL (T13) and the other wire to the adjacent common (T12).

Mixed Air Low Limit / Freeze Detect (MLL)This is a digital, dry contact style input. To connect the Mixed Air Low limit sensor to the controller, connect one wire from the sensor to MLL (T11) and the other wire to the adjacent common (T12).

Indoor Air Quality (IAQ)Use the LCI to configure this sensor as either a 0-10V analog input, or a digital, dry contact style input. Refer to the wir-ing diagram for correct dip switch settings.

To connect either type of IAQ sensor to the controller, connect the positive wire from the sensor to IAQ (T10) and the other wire to the adjacent common (T9).

Supply Air Humidity (SAH)To connect the Supply Air Humidity sensor to the unit, connect the positive wire from the sensor to SAH (T8) and the other wire to the adjacent common (T9). The sensor must be a 0-10 Volt type.

Return Air Temperature (RAT)To connect the return air temperature sensor to the controller, connect one wire of the sensor to RAT (T7) and the other wire to the adjacent common (T6).

Fan Proof (FNP)This is a digital, dry contact style input. To connect the Filter Status sensor to the controller, connect one wire from the sensor to FNP (T5) and the other wire to the adjacent common (T6).

Thermostat / Space Humidity / Space Temperature (STAT)To connect a TS302/TS304/TS306 thermostat, a Precon III thermistor (TS100 series), or 0-10V humidity sensor to the controller, connect one wire from the sensor to STAT (T3) and the other wire to the adjacent common (T4). Configure the controller for the appropriate sensor and note the limitations in functionality described in “Space Temp / RH Sensor Configuration” on page 19.

NOTE: if configured for a Precon III thermistor or 0-10V humidity sensor, W15 must be in the UI11 position and SW2 positions 3 & 4 must be set properly.

Digital Outputs

Cooling Stage 1 (C1)The cooling stage 1 output must be connected to a 24 VAC pilot relay if the load is greater than 1 ampere. If the load is less than 1 ampere, connect cooling stage 1 to C1 (T31) and the adjacent common (T30).

Cooling Stage 2 (C2)The cooling stage 2 output must be connected to a 24 VAC pilot relay if the load is greater than 1 ampere. If the load is less than 1 ampere, connect cooling stage 2 to C2 (T29) and the adjacent common (T30).

iWorx® DXUV


Reheat Valve Open (RVO)The Reheat Valve Open output must be connected to a 24 VAC pilot relay if the load is greater than 1 ampere. If the load is less than 1 ampere, connect the Reheat Valve Open to RVO (T28) and the adjacent common (T27).

Reheat Valve Close (RVC)The Reheat Valve Close output must be connected to a 24 VAC pilot relay if the load is greater than 1 ampere. If the load is less than 1 ampere, connect the Reheat Valve Close to RVC (T26) and the adjacent common (T27).

Heating Stage 1 (H1)The Heating Stage 1 output must be connected to a 24 VAC pilot relay if the load is greater than 1 ampere. If the load is less than 1 ampere, connect the Heating Stage 1 to H1 (T25) and the adjacent common (T24).

Heating Stage 2 (H2)The Heating Stage 2 output must be connected to a 24 VAC pilot relay if the load is greater than 1 ampere. If the load is less than 1 ampere, connect the Heating Stage 2 to H2 (T23) and the adjacent common (T24).

Fan Enable (FAN)The Fan Enable output must be connected to a 24 VAC pilot relay if the load is greater than 1 ampere. If the load is less than 1 ampere, connect Fan Enable to FAN (T22) and the adjacent common (T21).

Humidifier (HDFR)The Humidifier output must be connected to a 24 VAC pilot relay if the load is greater than 1 ampere. If the load is less than 1 ampere, connect Humidifier to HDFR (T20) and the adjacent common (T21).

Analog Outputs

Modulated Economizer (ECNM)The Modulated Economizer output is set from 0 to 10V through the control logic. Connect the positive wire from the economizer actuator to ECNM (T37) and the other wire to the adjacent common (T36).

Modulated Heating (HTGM)The Modulated Heating output is set from 0 to 10V through the control logic. Connect the positive wire from the heating actuator to HTGM (T35) and the other wire to the adjacent common (T36).

Modulated Cooling (CLGM)The Modulated Cooling output is set from 0 to 10V through the control logic. Connect the positive wire from the cooling actuator to CLGM (T34) and the other wire to the adjacent common (T33).

Modulated Fan (FANM)The Modulated Fan output is set from 0 to 10V through the control logic. Connect the positive wire from the fan actuator to FANM (T32) and the other wire to the adjacent common (T33).

Other Connections

Network (LON)Network wiring must be twisted pair. One network wire must be connected to terminal NETA (T1) and the other network wire must be connected to terminal NETB (T2). Polarity is not an issue since an FTT-10A network is used for commu-nications.

iWorx® DXUV


Power (PWR)Connect one output wire from a 24 VAC power supply to PWR (T39) and the other output wire from the power supply to the adjacent common terminal (T38). T38 must be connected to earth ground.

Ground (GND)Terminal GND (T40) must be connected to earth ground. Failure to properly ground this equipment will result in improper operation. Improper grounding may also increase the risk of electrical shock, and may increase the possibility of interference with radio and TV reception.

SPECIFICATIONS

Electrical InputsResolution: 10 bit

Humidity Inputs (SAH, RAH): Analog, 0-10 Volt

Air Temperature (SAT, RAT, MAT): Precon Type III 10K thermistor

Fan Proof (FNP): Dry Contact, Normally Closed

Digital Switch Inputs (FIL, MLL, SMK): Dry Contact, Normally Open

Indoor Air Quality (IAQ) Options: • Dry Contact, Normally Open• Analog, 0-10 Volt

Differential Pressure (DP) Options: • Analog, 0-10 Volt, Flow Rate• Analog, 0-10 Volt, Velocity Rate• Analog, 0-10 Volt, Differential Pressure

Thermostat (STAT) Options: • 10 Volt nominal, limited to 0.04 A - TS300 Series thermostat• Precon Type III 10K thermistor• Analog, 0-10 Volt - humidity sensor

Electrical OutputsHumidifier (HDFR), Fan Enable (FAN), Heating/Cooling Stages (H1, H2, C1, C2), Reheat Valve Open/Close (RVO, RVC): 24 Volts AC, 1A @ 50C, 0.5A @ 60C, limited by the Class 2 supply rating

Modulated Fan (FANM), Modulated Heating/Cooling (HTGM, CLGM), Modulated Economizer (ECNM): 0-10 Volts DC, 2K Ohm minimum load, 8 bit resolution

PowerRequires: 24VAC (20VAC to 28VAC), requires an external Class 2 supply

Consumes: 7.2W with no external loads, maximum limited by the Class 2 supply rating

iWorx® DXUV


Recommended Sensor Wire Maximum Length: 500 feet (152 meters)

Recommended LON Bus FTT-10A Network WireSpeed: 78KBPS

Max Volts: 42.4 Volts DC

Cabling: Maximum node-to-node distance: 1312 feet (400 meters); Maximum total distance: 1640 feet (500 meters)

MechanicalDimensions: 5.55” (141mm) high, 6.54” (166 mm) wide, 1.75” deep (44 mm), ABS

Controller Weight: 0.70 pounds (0.32 kilograms)

Shipping Weight: 1.0 pounds (0.46 kilograms)

Processor: 3150 Neuron 10 MHz

Flash: 48 Kilobytes

SRAM: 8 Kilobytes

Termination: 0.197” (5.0 mm) Pluggable Terminal Blocks, 14-22 AWG

Temperature: 32 °F to 140 °F (0 °C to 60 °C)

Humidity: 0 to 90%, non-condensing

UL Listed for US and Canada, Energy Management Equipment PAZX and PAZX7

FCC Part 15 Class A compliant

Cable Type Pairs Details Taco Catalog No.18AWG 1 Stranded Twisted Shielded Pair, Plenum WIR-018

Cable Type Pairs Details Taco Catalog No.Level 4 22AWG (0.65mm) 1 Unshielded, Plenum, U.L. Type CMP WIR-022

iWorx® DXUV


APPLICATION DESCRIPTIONFigure 5: DXUV Single Zone VAV Application

iWorx® DXUV


Space Temperature Control - The DXUV controller maintains the temperature of an air space to a user-defined set-point by modulating the fan speed. The space temperature setpoint is configured and may be overridden at the thermo-stat.

Supply Air Temperature Control - The supply air temperature is controlled by sequencing the heating and cooling stages or modulating heating and cooling valves. The supply air setpoint is indirectly configured by configuring the parameters for the Supply Air Setpoint Reset Curve which varies the supply air setpoint based on the difference between the space temperature setpoint and space temperature. The heating and cooling stages are enabled based on the space temperature and the space temperature setpoint.

Free Cooling - The DXUV determines if free cooling is available based on a dry bulb temperature comparison or an enthalpy comparison using either local return air or global humidity. Outdoor temperature, outdoor humidity and global humidity are provided by an ASM or CSM controller. Indoor humidity may be provided by a thermostat or humidity sen-sor. Indoor temperature may be provided by a thermostat, thermistor or a BZU3 controller.

Mixed Air Temperature Control - When free cooling is available, the economizer is modulated to allow outside air to be mixed in. In addition to maintaining the Mixed Air Temperature setpoint, the economizer also insures both a mini-mum flow rate and a minimum position. Flow rate feedback is provided by either a Flow sensor, a Velocity sensor, or a Differential Pressure sensor. Calibration of the Differential Pressure sensor is optional.

Dehumidification - Dehumidification of the air space is achieved using the cooling outputs to lower the supply air tem-perature. The controller is configured for normal dehumidification without any reheat, dehumidification with reheat, or dehumidification with heat. Dehumidification with heat requires the heating coils to be located downstream from (after) the cooling coils in the duct.

Humidification - Humidification of the air space is achieved using a digitally controller humidifier. Configurable limits for Supply Air Humidity and Purge Time insure that humidity does not build up in the supply duct.

Thermostat - The controller's thermostat input may be configured for a TS302/TS304/TS306 thermostat, a Precon-III temperature sensor, or a 0-10V humidity sensor.

Occupied Status - The controller operates in occupied or unoccupied state. The LCI determines the active operating mode. The controller maintains the comfort level to a user-defined setpoint during the occupied state. The controller uses setup and setback values during the unoccupied state. A backup schedule is provided in case the LCI is not avail-able.

Fan Proof - A digital input is provided to monitor the status of the supply air fan. If fan proof fails at any time while the fan is on, the controller turns off the fan output and all stages of heating and cooling. The controller returns to normal operation after it is reset. An alarm is reported to the LCI when this condition exists. This failure is delayed for 30 sec-onds when the fan is initially turned on.

Smoke Detection - The controller monitors a digital input to determine the presence of smoke. When the input indi-cates smoke, the controller turns off the supply air fan and all stages of heating and cooling immediately. The controller returns to normal operation after it is reset. An alarm is reported to the LCI when smoke is detected.

Air Filter - The controller monitors the status of the air filter. An external pressure switch is wired to the input to deter-mine when the filter becomes dirty. An alarm is reported to the LCI when this condition exists.

Mixed Air Low Limit (Freeze) - Mixed air low limit protection is provided through a digital input. If a low limit condition exists, the controller turns off the supply air fan and all stages of heating and cooling. An alarm is reported to the LCI when this condition exits. If configured for either analog or floating point valve, the heating valve opens 100% to pre-vent freezing of the coils. The controller returns to normal operation after it is reset. Following the reset or the beginning of occupancy, there is a 10 minute delay before the mixed air low limit is checked again.

Indoor Air Quality - An indoor air quality (IAQ) input is provided. If an indoor air quality condition is indicated, the sup-ply air fan is energized and the economizer is overridden to supply fresh air to the space. An IAQ alarm is sent to the LCI only after a configurable period of time has passed to give the fan and economizer the opportunity to clear the con-dition. The IAQ input is configured for either an analog (0-10V) or digital input.

Runtimes - The controller monitors the runtime of the cooling stages, heating stages, and fan. When any of the run-times exceeds a user-configured limit, a maintenance alarm is reported to the LCI.

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Temperature Limit Alarms - When the space temperature exceeds a user-configured limit, a high limit alarm is reported to the LCI. When the space temperature drops below a user-configured limit, a low limit alarm is reported to the LCI. When the space temperature returns to the proper range, a return to normal alarm is reported to the LCI.

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SEQUENCE OF OPERATIONThis section describes the detailed sequence of operation for the controller’s algorithms.

Space Temp / RH Sensor ConfigurationThe Space Temp / RH Sensor input (STAT) may be configured for a TS302/TS304/TS306 thermostat, a Precon III thermistor or a 0-10V humidity sensor. The sensor choice impacts the ability of the controller to provide humidification, dehumidification and free cooling as summarized in the following table:

TS302/TS304/TS306 ThermostatThe space temperature, setpoint adjustment, humidity, fan auto/on status, and occupancy override request are moni-tored by the thermostat and communicated to the controller. The controller automatically detects a failure of the ther-mostat. If the thermostat fails, the cooling stages, heating stages, economizer, and fan are turned off and control is disabled. The accumulated extended occupancy time is displayed on the same page and is updated every day at 11:00 pm. If a BZU3 is associated with the DXUV controller, the space temperature and setpoint inputs from the thermostat are ignored; humidity and fan status are not.

NOTE: Although other thermostats are supported (TS301, TS303, TS305), only the TS302 and TS304 thermostats support humidity. A humidity reading is necessary for dehumidification, humidification and localized free cooling that is based on enthalpy.

0-10V RH SensorThe space humidity is provided by a humidity sensor where 0 and 10V correspond to 0 and 100% humidity. When the controller is associated with a BZU3, the BZU3 provides the zone temperature. A humidity sensor on the DXUV is used when humidification, dehumidification and/or free cooling that is based on enthalpy are required.

Precon III (TS100 Series) ThermistorThe space temperature is provided by a Precon III thermistor. When configured for a thermistor input, humidification, dehumidification, and free cooling based on return air are not available because there is no humidity sensor. However, free cooling based on global humidity or dry bulb temperature is still available.

Thermostat Configuration

Zone Temp

Source

Free Cooling Configuration Inside RH Source Outside RH

SourceHumid and Dehumid? Free Cooling?

SLink Thermo-stat

Rtn Air Humidity Thermostat ASM/CSM Yes Yes

SLink Thermo-stat

Global Humidity ASM/CSM ASM/CSM Yes Yes

SLink Thermo-stat

Dry Bulb Temp Thermostat ASM/CSM Yes Yes

Used for RH BZU3 Rtn Air Humidity RH Sensor ASM/CSM Yes YesUsed for RH BZU3 Global Humidity ASM/CSM ASM/CSM Yes YesUsed for RH BZU3 Dry Bulb Temp RH Sensor ASM/CSM Yes YesPrecon III Temp

SensorRtn Air Humidity - ASM/CSM - -

Precon III Temp Sensor

Global Humidity ASM/CSM ASM/CSM - Yes

Precon III Temp Sensor

Dry Bulb Temp - ASM/CSM - Yes

Not Used BZU3 Rtn Air Humidity - ASM/CSM - -Not Used BZU3 Global Humidity ASM/CSM ASM/CSM - YesNot Used BZU3 Dry Bulb Temp - ASM/CSM - Yes

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Space Temperature SetpointsThe DXUV controls the Space Temperature by modulating the Fan. See “Fan Operation” on page 28. Feedback for the space temperature is the thermostat, Precon III or BZU3 (see previous section). The heating and cooling setpoints for both occupied and unoccupied periods are user-configured values.

Setpoints in Occupied ModeThe heating and cooling setpoints for the occupied periods are user-configured offsets from the space setpoint. The zero energy band (ZEB) is the temperature range between the heating and cooling setpoints where there is no heating or cooling demand.

The effective setpoint is a calculated value based on the space setpoint and the thermostat's setpoint offset value. The thermostat's setpoint offset is used to increase or decrease the space setpoint from the local thermostat in occupied mode only. The thermostat's setpoint offset is limited to plus or minus the programmed setpoint adjustment limit. The thermostat's setpoint offset affects the calculated heating and calculated cooling setpoints by an equal amount.

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The actual programmed heating and cooling setpoints are not changed by the thermostat's setpoint offset; the offset is simply added to the programmed setpoints to derive the calculated values. If a thermostat is not used, the thermostat offset values are zero.

CoolingSp = SpaceSp + CoolingOffset

HeatingSp = SpaceSp - HeatingOffset

ZebOcc = CoolingSp - HeatingSp

EffectiveSP = SpaceSp ± ThermostatSpOffset

CalcCoolingSp = CoolingSp ± ThermostatSpOffset

CalcHeatingSp = HeatingSp ± ThermostatSpOffset

Figure 6: Setpoint Adjustment (Occupied Mode)

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Setpoints in Unoccupied ModeThe heating and cooling setpoints for the unoccupied periods are user-configurable; they are not configured as offsets as the occupied mode setpoints are. As in the occupied mode, the zero energy band (ZEB) in the unoccupied mode is the temperature range between the heating and cooling setpoints where there is no heating or cooling demand. The space setpoint for unoccupied mode is calculated as the temperature that is halfway between the heating and cooling setpoints, or midway into the zero energy band.

ZebUnOcc = CoolingSp - HeatingSetpoint

SpaceSp = HeatingSp + (ZebUnocc / 2)

Figure 7: Space Setpoint Calculation (Unoccupied Mode)

Supply Air Temperature ControlThe DXUV is configured to use Heating and Cooling Setpoints from the SAT Setpoints configuration page, or to calcu-late a reset setpoint from the parameters found on the Reset Setpoints configuration page. When the Differential tem-peratures from the Reset Setpoints configuration page are zero, the values from the SAT Setpoints page are used.

To disable the Supply Air Temperature setpoint reset, configure the Max Differential parameter to zero. When disabled, the space heating and cooling setpoints are used for Supply Air Temperature setpoints.

If the Supply Air Temperature setpoint reset curve is enabled, the DXUV controller calculates Supply Air Temperature setpoints with the supply temperature reset curve as defined in the following algorithm:

• When the space temperature differential is less than Min Differential, the supply temperature setpoint is set to the Setp Low value.

• When the space temperature differential is more than Max Differential, the supply temperature setpoint is set to the Setp High value.

• When the temperature differential is between Setp Low and Setp High, the supply temperature setpoint is set to a linear interpolation between Setp Low and Setp High values.

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Figure 8: Supply Air Temperature Reset Curves

Supply Air Heating and Cooling SequenceThe controller is configured to use floating control outputs, a modulated analog output, or two stages of output for heat-ing and cooling the supply air. One stage may also be designated as a modulating stage.

Heating and Cooling with StagesThe stages are sequenced based on the supply air temperature, the supply air heating and cooling setpoints and the control bands.

Heating stages are enabled when the temperature falls below Heating ON; Cooling stages are enabled when the tem-perature rises above Cooling ON.

Heating stages do not change when the temperature is above Heating ON and below Heating SP; cooling stages do not change when the temperature is below Cooling ON and above Cooling SP.

Heating stages cycle off when the temperature is above Heating SP. If the temperature rises above setpoint, heating stages are disabled immediately. Cooling stages cycle off when the temperature is below Cooling SP. If the tempera-ture falls below setpoint, cooling stages are disabled immediately.

The Heating and Cooling Stage Sequence is shown in the diagram below. Temperatures shown are default values in Fahrenheit.

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Figure 9: Heating and Cooling Stage Sequence

Heating and Cooling with Floating Point OutputStaged Outputs may be configured for floating point control of a valve. Floating point control is enabled when stages are set to zero and the configured valve travel time is non-zero. Stage 1 output is the valve OPEN signal and stage 2 output is the valve CLOSE signal.

After a reset, the floating point valve is calibrated by closing the valve for a period of twice the travel time. This ensures that the valve is fully closed. When the valve is at its calculated 0 or 100 percent position, the valve is overdriven for 30 seconds to ensure that the valve is fully closed or open.

The floating point control is similar to the cooling modulated algorithm. For the cooling valve, when the supply temper-ature is above the cooling setpoint, the valve is driven open. When the supply temperature is below the cooling set-point, the valve is driven closed.

Similarly for the heating valve, when the supply temperature is below the heating setpoint, the valve is driven open. When the supply temperature is above the heating setpoint, the valve is driven closed.

There is a ±1.0 °F (0.55 °C) deadband around the setpoint to prevent the valve from dithering. During mixed air low limit alarms, the heating and cooling valves are driven to 100%.

Heating and Cooling with Modulated OutputThe calculated loop setpoint is derived from the cooling setpoint and the loop proportional gain:

CalcCoolingLoopSp = CalcCoolingSp + 1 / (2 * Kp)

CalcHeatingLoopSp = CalcHeatingSp - 1 / (2 * Kp)

The output is modulated by a P+I control loop based on the supply air heating or cooling setpoint and the supply air temperature. The P+I control loop modulates the output to maintain a constant supply temperature.

As the temperature falls below the supply air heating setpoint, the heating output modulates open. As the temperature rises above the the supply air heating setpoint, the heating output modulates closed. Similarly, as the temperature rises above the supply air cooling setpoint, the cooling output modulates open. As the temperature falls below the supply air cooling setpoint, the cooling output modulates closed.

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To prevent the integral component from becoming too large, there is an anti-wind-up reset protection. This protection clamps the integral value when all of the components add up to more than 100% or less than 0%.

Kp = Proportional Gain

Ki = Integral Gain

ErrorHeatingLoop = | HeatingLoopSp - Temperature |

ErrorCoolingLoop = | CoolingLoopSp - Temperature |

Modulated StagesThe DXUV supports simultaneous staged and modulated output for both heating and cooling. Two parameters in the Staged Heating and Staged Cooling configuration pages configure the modulating stage.

When Stage Modulation is set to “No Mod”, the staging operates without modulated output as described above. When Stage Modulation is set to either “Stage 1 Mod” or “Stage 2 Mod”, the modulated output occurs simultaneously with the staged outputs.

Modulating stages function the same for both heating and cooling. For modulating stages to function properly, the mod-ulation settings must be configured in addition to the staged settings.

The DXUV supports two stages with stage one modulating, two stages with stage two modulating and one stage that is modulating. Each configuration is described below:

One StageWhen there is only one stage, and it is configured for modulation, the modulated output begins when the stage is ener-gized. The Stage Delay Threshold is ignored as there are no other stages.

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The modulation output and the displayed output ranges are both 0 to 100%. The relation between displayed output, modulation and staging is shown below:

Two Stages, Stage Two ModulatingWhen there are two stages with the second stage modulating, the modulated output does not begin until the second stage is energized. The Stage Delay Threshold is ignored as there are no stages after the second stage.

During the first stage, the modulation output remains off and the displayed output is 50%. When the second stage is energized, the modulation starts and increases towards 100%. The displayed output in the second stage ranges from 50 to 100%.

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Two Stages, Stage One ModulatingWhen there are two stages with the first stage modulating, the modulated output begins when the first stage is ener-gized. The second stage is not energized until the configured “Stage Time” after the modulated output reaches the Stage Delay Threshold.

When the second stage is energized, the integral component of the modulation algorithm is cleared and modulation continues. This sets the modulated output to a value based solely on the error, usually a low value. The integral is then allowed to increase and the modulated output rises towards 100%.

During the first stage, the displayed output ranges from 0 to 50%. During the second stage, the displayed output values range from 50 to 100%.

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Fan OperationThe fan operates in one of the two configurable ranges: 0 to 10 Volts and 0 to 5 Volts. The configuration parameter Min-imum Output is a percentage of this configured range. The Fan Output displayed on the LCI is also a percentage of the range. The configuration parameter Control Band defines the temperature region where the Fan Output is proportional to the required heating or cooling.

When the space temperature is below the control band in heating, or above the control band in cooling, then the fan operates at 100%. When the space temperature is within the control band, the fan speed is proportional to how much heating/cooling is required.

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When the temperature is between the heating and cooling setpoints, if the space is occupied and the Fan Type is On, then the Fan Output remains at the configured Minimum Speed. If the space is unoccupied, or if the Fan Type is Auto, then the Fan Output is zero.

Figure 10: Occupied Fan Operation

Figure 11: Unoccupied Fan Operation

Fan Type / Staged Heat CombinationsThe fan is configured to one of four fan types (below); these interact with the staged heating in the following ways:

Fan Type DescriptionAuto The fan is enabled when cooling or heating. Heating output (staged, modulated or floating control) delivers heat

to control the supply air temperature whereas the fan output delivers heat to control the zone temperature.On The fan is enabled when the zone is occupied or overridden from the thermostat. Heating output (staged, mod-

ulated or floating control) delivers heat to control the supply air temperature whereas the fan output delivers heat to control the zone temperature.

Auto No Heat As with the Auto fan type, the fan is used in cooling mode; unlike Auto fan type, the fan is NOT used in heating mode. If an economizer is enabled, the fan functions the same as Auto mode.

Auto W/Radi-ant

The fan is used in cooling, and heating all stages of heating except for the first stage which is used to energize radiant heat. This is useful for applications that allow the radiant heat to attempt to reach the setpoint without energizing the fan. If an economizer is enabled, the fan functions the same as Auto mode.

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When the zone initially requires heating, the first stage of heating comes on to energize the radiant heat. The fan does not run and the supply air temperature is not controlled during the first stage of heating.

When additional heat is required in the zone, the second stage of the heat output is used as “ON/OFF” control of the supply air temperature, and the fan is modulated to control zone temperature.

As the heating requirement is reduced, the fan and stage 2 outputs de-energize; stage 1 (the radiant heat) stays on until the zone heating requirement is gone.

Figure 12: Auto Radiant Fan Operation

Fan ProofWhen there is a demand for heating or cooling, the fan output is energized. A fan status input is provided for monitoring the operation of the fan. When the fan is initially turned on, there is a configurable delay before the fan status is checked. After the delay, if the fan is on and the status indicates that the fan is not running, a fan failure alarm is gener-ated.

The heating and cooling stages are interlocked with the fan. When a fan failure alarm exists, the heating stages, cool-ing stages and the fan turn off. Normal operation resumes when the controller is reset or power cycled.

NOTE: If a fan status switch is not provided, the input must be jumpered to the adjacent common. After a fan failure, the controller's status LED turns solid red. To return the controller to normal operation after the failure condition is resolved, the controller must be reset or power cycled.

Economizer ControlThe controller supports a configurable modulated economizer. The economizer is enabled based on the availability of free cooling from the outdoor air. All free cooling configurations require outdoor air temperature provided by an ASM or CSM controller. Enthalpy-based free cooling requires outside air humidity, also provided by an ASM or CSM controller.

Free Cooling based on return air is only supported when the Thermostat is configured as:

• “SLink” - with a TS302/TS304/TS306 thermostat. These thermostat models provide both zone temperature and zone humidity,

• “Used for RH” - with a 0-10V RH sensor and an associated BZU3 to provide temperature.

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Configurations with a Precon III (TS100 Series) connected to the STAT input do not have a local humidity input and cannot support Free Cooling based on return air enthalpy.

Free cooling type and enthalpy offsets are configured in the Free Cooling configuration page. Each of the free cooling types are described below:

Dry Bulb Free CoolingFree cooling may be configured to compare outdoor air temperature and indoor air temperature.

When the outdoor air temperature is a configured amount below the indoor air temperature, free cooling is enabled. When the outdoor air temperature rises above the indoor temperature, free cooling is disabled.

Dry bulb free cooling does not require humidity data.

Enthalpy Based Free CoolingIn both Return Air Humidity and Global Humidity configurations, an enthalpy calculation (total energy) is performed on the outside air based on the outside air temperature and humidity provided by an ASM or CSM on the network.

Inside air enthalpy is based on the return air or a global inside air humidity value also provided by an ASM or CSM on the network.

Enthalpy used in free cooling (BTU/lb) is the total energy density of the air which consists of the enthalpy of the dry air (sensible heat) + the enthalpy of the evaporated water (latent heat).

Free cooling based on comparing the enthalpies of inside and outside air rather than simple dry bulb temperatures more accurately represents the total energy savings achieved by using outside air.

Return Air Free CoolingWith the Return Air Humidity configuration, the inside air enthalpy calculation is based on the temperature from the associated BZU3 or thermostat, and humidity from the local humidity sensor or thermostat.

If the outside air enthalpy is lower than the inside air enthalpy minus the free cooling setpoint then the economizer is enabled for free cooling.

Global Free CoolingWith the Global Humidity configuration, the inside enthalpy calculation is based on the temperature from the associated BZU3 or thermostat, and the global inside air humidity provided by an ASM or CSM controller.

Economizer FunctionsThe modulated economizer is enabled when free cooling is available as determined by the enthalpy or dry-bulb calcu-lations described above. The economizer may be configured to be disabled during unoccupied periods.

When the economizer is enabled, a control loop modulates the economizer output position to maintain a constant mixed air temperature. As the mixed air temperature increases above the economizer setpoint, the economizer posi-tion is modulated open. As the mixed air temperature falls below the setpoint, the economizer position is modulated closed.

In addition to a configurable minimum position, the DXUV economizer supports a configurable minimum flow rate. The economizer maintains both a minimum position and minimum flow rate. Detailed Economizer operation is described below.

• When the Economizer is not enabled (configuration or by virtue of occupied status) or if the fan proof has not ener-gized yet:•The economizer closes completely - this is the ONLY configuration when the economizer goes below the Min

Position configuration.• When the Economizer is enabled but the controller is heating, or the economizer is ready to supply Free Cooling

but Free Cooling is not available:•If the minimum flow is configured, the economizer maintains minimum flow.

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•The economizer opens when the flow rate is below the minimum flow.•The economizer closes when the flow rate is more than 5% above minimum flow.•The economizer maintains its present position when the flow rate is between the minimum flow and 5% above

the minimum flow. (flow deadband).• The economizer is in Free Cooling mode and the mixed air temperature is more than 1 °F above the setpoint (too

warm):•The economizer opens regardless of flow rate. This cools the mixed air temperature and increases the flow rate.

• The economizer is in Free Cooling mode and the mixed air temperature is between 0 and 1 °F above setpoint (temperature deadband):

•If the flow rate is less than minimum flow, the economizer opens, otherwise it will maintain its present position.• The economizer is in Free Cooling mode and the mixed air temperature is between Minimum Temperature and set-

point (slightly cool):•If the flow rate is less than minimum flow then the economizer opens.•If the flow rate is more than 5% above minimum flow then the economizer closes.•If the flow rate is between minimum flow and 5% above minimum flow then the economizer maintains its present

position.• The economizer is in Free Cooling mode and the mixed air temperature is below Minimum Temperature (very

cool):•The economizer closes regardless of the flow rate.Figure 13: Economizer Operations

Note that if communications is lost with the ASM or CSM, the economizer is disabled. If communication is lost with the BZU3 (for configurations that rely on it for temperature data), all control loops are disabled including the economizer.

DehumidificationDehumidification is supported when the DXUV thermostat is configured for:

• “SLink” - with a TS302/TS304/TS306 thermostat. These thermostat models provide both zone temperature and zone humidity, or

• “Used for RH” - with a 0-10V RH sensor and an associated BZU3 to provide temperature.Configurations with a Precon III (TS100 Series) have no local humidity input and cannot support dehumidification.

To enable dehumidification, configure the dehumidification type to occupied or always enabled and configure the dehu-midification setpoint to a valid non-zero value.

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Dehumidification begins when the space humidity rises above the dehumidification setpoint and the space temperature is above the space heating setpoint. When the humidity falls below the dehumidification setpoint minus 3%, or the tem-perature falls below the heating setpoint minus the shutoff offset, dehumidification stops.

During Dehumidification, the operating mode is displayed as Dehumid and the cooling outputs stage on, or modulating output or floating control valve will be set to 100%.

The reheat type is configured to Normal, w/Reheat or w/Heat. This configuration determines how the heating interacts with dehumidification:

Normal DehumidificationNormal dehumidification stops when the space temperature drops below the cooling setpoint minus the shutoff offset; dehumidification remains disabled while the controller is in heating mode.

Dehumidification With ReheatDehumidification with reheat modulates a floating point valve to drive an external reheat element. Cooling and reheat-ing may occur at the same time.

During reheat, the normal heating and cooling setpoints are ignored and the reheat valve modulates to maintain the configured reheat temperature setpoint. When the dehumidification setpoint is reached, the normal heating and cooling resumes.

Dehumidification With HeatDehumidification with heat may energize the heating and cooling coils at the same time. The heating coil must be placed downstream from the cooling coil in the duct to allow the heating coil to heat the air which is cooled below the cooling setpoint minus the Shutoff Offset.

HumidificationIn addition to a supply air humidity (SAH) input, humidification requires space humidity; the thermostat must be config-ured for:

• “SLink” - with a TS302/TS304/TS306 thermostat. These thermostat models provide both zone temperature and zone humidity, or

• “Used for RH” - with a 0-10V RH sensor and an associated BZU3 to provide temperature.Configurations with a Precon III (TS100 Series thermostat) have no local humidity input and cannot support humidifica-tion.

To enable humidification, configure the Humidification Type to either “Occupied or Always Enabled,” and the Space Setpoint to a non-zero value.

The humidification output is energized when the space humidity falls below the configured space setpoint. Humidifica-tion remains on until the space humidity rises 1% above the humidity setpoint. The space setpoint is a minimum humid-ity setpoint value.

To safeguard against too much humidity in the supply air duct, humidification is also disabled when the supply humidity rises above the supply setpoint. The supply setpoint is a maximum humidity setpoint.

Hydronic Zone InteractionTo configure the DXUV to be part of a hydronic zone, associate the DXUV with a BZU3 from the BZU3 controller's con-figuration screens. Refer to the BZU3 Application Guide for details on this procedure.

The DXUV controller initiates network communication with the associated BZU3 Zone controller, which replies with the following zone parameters to the DXUV. These zone parameters take precedence over the DXUV calculated parame-ters:

• space temperature

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• occupied setpoint• unoccupied setpoint• hvac mode• fan mode• occupied status

For example: when the DXUV is configured with a TS302/TS304/TS306 thermostat, the space temperature from the thermostat is ignored and the space temperature from the BZU3 is used for temperature control, however, the space humidity from the thermostat is not ignored because humidity data is not provided by the BZU3.

Cutoff TemperaturesCutoff temperatures may be configured for heating, cooling and the economizer to suppress mechanical equipment from activating if the outside air temperature is above or below a configured cutoff setpoint.

Heating will be suspended when the Outside Air Temperature rises above the configured max OAT heat and resumes when the outside air temperature falls 5°F below the max OAT heat. Cooling is suspended when the outside air tem-perature falls below the configured min OAT cool and resumes when the outside air temperature rises 5°F above the min OAT cool. The economizer closes the dampers to the MinAirPosition whenever the outside air temperature is out-side the Max OAT Econ and Min OAT Econ temperature limits.

The Supply Air Temperature is monitored and compared to the SAT Cooling Limit. If the supply air temperature falls below the SAT Cooling Limit, additional cooling is not enabled. If the supply air temperature rises above the SAT Cool-ing Limit additional cooling is enabled as needed.

Indoor Air Quality (IAQ)An indoor air quality input is provided (IAQ). If an indoor air quality condition is indicated, the fan is increased to the configured maximum and the economizer is overridden to 100% to supply fresh air to the space.

The controller waits for a configurable delay period to give the increased air flow a chance to clear the IAQ condition before sending the IAQ alarm to the LCI. If the IAQ condition goes away during the delay period, no alarm is sent.

The source of an indoor air quality signal is configured to be either a digital sensor providing an on/off signal or a ana-log sensor. To use a digital IAQ sensor, configure the IAQ mode to digital. To use the analog IAQ sensor, configure the IAQ mode to analog and configure the Analog IAQ Sensor page.

The IAQ Reset Limit defines the temperature band around the space temperature setpoints where the IAQ mode oper-ates. When the temperature rises above the cooling setpoint plus the IAQ Reset Limit, or drops below the heating set-point minus the IAQ Reset Limit, the controller resumes normal fan and economizer control to maintain a comfortable space temperature regardless of the air quality. Once the space temperature is brought within the space setpoints, if the IAQ condition still exists, the controller resumes the IAQ mode of operation.

Smoke DetectionA smoke detector input is provided (SMK). If the smoke detector indicates that smoke is present, all of the outputs are turned off. The controller returns to normal operation when it is reset or power cycled.

Mixed Air Low Limit DetectionA mixed air low limit detection input is provided (MLL). If a low limit condition is detected, all of the outputs are turned off. The controller returns to normal operation when it is reset or power cycled. After the DXUV switches from unoccu-pied mode to occupied mode, there is a ten minute delay before it reports Mixed Air Low Limit alarms. If heating is con-figured as modulated or floating point, the heating valve opens to 100%.

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Filter StatusA filter status input is provided (FIL). If the filter status indicates that maintenance is required on the filter, an alarm is sent to the LCI and the controller continues to operate normally.

Analog OutputsAll modulated outputs support both normal and reverse actuation. Configure the minimum voltage scaling parameter less than the maximum voltage scaling factor for normal actuation. Configure the minimum voltage scaling parameter more than the maximum voltage scaling factor for reverse actuation.

Real Time Clock (RTC)The real-time clock is synchronized with the LCI each day at midnight. The controller uses the real-time clock and the local backup schedule during periods when the LCI is not available.

Local Backup SchedulesNormally, the LCI determines the operating mode (occupied or unoccupied). Local backup schedules may be config-ured for week days and weekend days for use when the LCI is not available. Backup schedules are used if communi-cations with the LCI is lost for more than ten (10) minutes. If communications with the LCI is lost and the backup schedules have not been configured, the controller operates in the occupied mode.

Runtime AccumulationsThe total runtime is accumulated for heating, cooling and fan outputs. The runtimes may be used to indicate that main-tenance is required on the equipment controlled by these outputs. The runtime may be reset from the LCI.

Alarms and EventsThe controller detects certain alarm conditions; if the controller is communicating on the LCI's LON network, the alarms are sent to the LCI.

If the DXUV is in any of these alarm situations, the status LED is red; otherwise the status LED is green.

Digital Input AlarmsThe controller monitors the status of the digital inputs and generates alarms for the following events:

• Fan failure (Fan Failed Alarm)• Smoke detected (Smoke Detected Alarm)• Mixed air low limit (Low Limit Alarm)• Dirty filter (Dirty Filter Alarm)• Indoor air quality (Indoor Air Quality Alarm)

Thermostat FailureThe controller automatically detects the presence of the local thermostat and monitors its status. If the thermostat fails to communicate with the controller, a Thermostat Failed Alarm is generated and the controller's status LED turns red. If the space temperature is overridden by a host controller, or if the thermostat input is configured for a Precon or humid-ity sensor, this alarm is disabled.

Maintenance AlarmThe controller provides user-configurable run limits for generating runtime Maintenance alarms. When any of the cool-ing, heating or fan runtime limits are exceeded, a maintenance alarm is sent to the LCI.

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Space Temperature AlarmsThe controller generates high and low limit alarms for the space temperature. The space temperature alarm limit offset is a configurable value.

The temperature limits are calculated based on the control setpoints, alarm limit offset, and control band.

When the measured space temperature exceeds the high limit, a high limit alarm (Space Temperature High Limit Alarm) is generated. When the space temperature drops down 1° F (0.55 °C) below the high limit, the Space Tempera-ture Return to Normal alarm is generated.

When the space temperature drops below the low limit, a low limit alarm is generated (Space Temperature Low Limit Alarm). A return to normal alarm is generated when the space temperature rises 1° F (0.55 °C) above the low limit.

When the controller switches between the unoccupied and occupied modes of operation, space temperature alarms are inhibited for 30 minutes to eliminate nuisance alarms.

Outside Air Control Setup and Flow Rate CalibrationThe differential pressure sensor input (DP) may be configured for a differential pressure sensor, a velocity sensor or a flow sensor.

To use the DP input with a flow sensor, configure the Sensor Option on the OA Control Setup page to “Flow” and con-figure the Flow Sensor page with valid values.

To use the DP input with a velocity sensor, configure the Sensor Option on the OA Control Setup page to “Velocity”, the Area with the cross sectional duct area, and configure the Velocity Sensor page with valid values.

The remainder of this section describes how to use the DP input with a differential pressure sensor.

The Pressure Sensor configuration screen is used to configure the pressure sensor's voltage and flow rate ranges. The OA Control Setup configuration screen provides additional parameters that the DXUV requires to calculate the flow constant (K) used in converting differential pressure to flow rate (CFM), or to calibrate the flow constant when a flow rate is known.

The Sensor Option parameter in the OA Control Setup screen has the following choices:

Flow (Default)Use the DP input with a flow sensor configured in the Flow Sensor configuration page.

VelocityUse the DP input with a velocity sensor configured in the Velocity Sensor configuration page. Calculate flow using the Area parameter on the OA Control Setup screen as follows:

Flow (CFM) = Velocity (FPM) X Area (Sq FT)

dP UncalibratedUse the DP input with a differential pressure sensor configured in the Pressure Sensor configuration page. The flow rate is calculated using the Area and Sensor Gain parameters as follows:

Flow (CFM) = 4005 X Area (Sq FT) X Sqrt(dP (WC) / Sensor Gain (No Units))

dP CalibratedUse the DP input with a differential pressure sensor configured in the Pressure Sensor configuration page. The flow rate is calculated using the previously calibrated flow constant (K) that was saved on the controller in non-volatile mem-ory when a calibration was performed. The flow rate calculation is:

Flow (CFM) = K (CFM) X Sqrt(dP)

iWorx® DXUV


CALIBRATEThe Calibration option calculates the flow constant (K) and saves it to non-volatile memory. Calibration also changes the configuration option to “Calibrated” and updates the Area parameter with a new value based on the calibration.

The procedure for auto-calibrating the flow constant (K) is:

• open the damper to 100% from the commissioning screen• select the configuration option “CALIBRATE” from OA Control Setup screen• when the air flow has settled, measure the air using air flow measuring equipment• enter the “Flow Rate” from the air flow measuring equipment in the “Calibration Flow” parameter• select “Enter”

Not Used

When this option is chosen, flow rate cannot be measured and minimum flow cannot be maintained.

CommissioningThe DXUV provides the ability to override normal operation through the commissioning configuration screen. When commissioning is enabled, values in this screen are used for outputs. Configurable outputs are:

Automatic ConfigurationThe DXUV and iWorx® Local Control Interface (LCI) use a self-configuring network management scheme requiring no external tools, binding, or LONWORKS knowledge. The LCI recognizes and configures the DXUV when the controller’s service pin is pressed. The controller’s status light flashes green until the controller is configured, and is solid green after the controller is configured. Once the service pin has been pressed, no further action is required by the user; the controller is fully accessible to the LCI. Users may bind to SNVTs on the DXUV with LNS or other LONWORKS tools if they wish.

The LCI also provides network supervision of the DXUV. The LCI periodically sends a "ping" message to the DXUV, which elicits a response. If the response fails, an alarm is displayed on the LCI. The LCI also uses the "ping" message to refresh the occupancy mode and other system wide data.

Output ConfigurationHumidifier On/OffFan Enable On/OffHeating Stage 2 On/OffHeating Stage 1 On/OffReheat Valve Close On/OffReheat Valve Open On/OffCooling Stage 2 On/OffCooling Stage 1 On/OffModulated Fan 0-10 VDCModulated Cooling 0-10 VDCModulated Heating 0-10 VDCModulated Economizer 0-10 VDC

iWorx® DXUV


CommunicationsThis section describes the explicit messaging necessary for free cooling calculations and hydronic zone interaction.

Figure 14: DXUV Network Communication

Table 2: Ping Message

Table 3: Ping Reply Message

U8 HourU8 MinuteU8 SecondU8 Occupied CommandU8 UnitsSNVT_temp_p Hot Water TempSNVT_temp_p Outdoor Air Temp (OAT)SNVT_lev_percent Outdoor Air Humidity (ORH)SNVT_lev_percent Indoor Air Humidity (IRH)U8 Unit EnableSNVT_temp_p Cold Water TempSNVT_temp_p Supply Air TempSNVT_lev_percent Supply Air RHSNVT_temp_p DL Adjust 1SNVT_temp_p DL Adjust 2SNVT_temp_p DL Adjust 3

U8 Unit NumberSNVT_temp_p Hot Water TempSNVT_temp_p Outdoor Air Temp (OAT)SNVT_lev_percent Outdoor Air Humidity (ORH)SNVT_lev_percent Indoor Air Humidity (IRH)

iWorx® DXUV


Table 4: Master Configuration Message

Table 5: BZU3 Poll Request

Table 6: BZU3 Poll Response

Communication Required for Free CoolingAn ASM or CSM controller must be on the network for free cooling to occur. The ASM/CSM is the source for outside air temperature and outside air humidity that is ultimately used by all the controllers on the network.

Ping messages are periodically sent from the LCI to all iWorx® controllers on the network. When the ASM/CSM con-troller receives a ping message from the LCI, it replies with a ping reply message that contains outside air temperature and outside air humidity. Ping replies from other controllers are not used other than to verify communications.

The LCI includes the outside air temperature and outside air humidity in future ping messages sent to the DXUV (and all controllers). The DXUV compares its own temperature and humidity to the outside air temperature and humidity to determine if free cooling is available.

If the DXUV has not received a ping message from the LCI in 10 minutes, the DXUV's normally green status LED changes to amber.

Communication Required for Hydronic Zone InteractionThe BZU3 controller must be on the network for hydronic zone interaction to occur. In a BZU3 configuration screen, the DXUV is associated with the BZU3. This action does not set parameters on the BZU3, it initiates the LCI to send a Master CFG message with BZU3 association data to the DXUV. The BZU3 association data is saved and used by the DXUV for initiating polling messages to the BZU3.

Periodically, the DXUV sends a polling message to the BZU3 which responds with a message containing the zone's temperature, setpoints, occupied state, HVAC mode and fan mode.

U8 Unit EnableU8 Energy AlarmSNVT_temp_p Cold Water TempSNVT_temp_p Supply Air TempSNVT_lev_percent Supply Air RH

U8 SequenceU8 Total UnitsU8 Starting UnitU8 Reference ZoneU8 Units In MessageU8[6] Neuron IDU8 Unit NumberU8 Controller Type

SNVT_temp_p Zone Occupied SetpointSNVT_temp_p Zone Unoccupied Setpoint

SNVT_temp_p Zone TemperatureSNVT_temp_p Occupied SetpointSNVT_temp_p Unoccupied SetpointU8 : 4 HVAC StatusU8 : 3 Fan ModeU8 : 1 Occupancy State

iWorx® DXUV


CONTROLLER IDENTIFICATIONOnce the DXUV is properly installed and recognized by the Local Control Interface (LCI), the LCI can be used to con-figure the settings of the controller. This section describes the commands available on the LCI for configuration of the DXUV, and the meanings and suggested values for controller parameters. For more information on using the LCI, see the iWorx® LCI Application Guide.

Network InputsThe DXUV allows a network manager to write to Network Input Variables (NVI) for the purpose of overriding the config-uration, operation and outputs of the DXUV.

Values written to NVIs have absolute priority over any other controller operation.

nviSpaceTempThis overrides the space temperature as obtained from the thermostat, sensor, or ASM/CSM module and is used by the controller for space temperature control. Writing to this variable is also reflected in the controller's output of the space temperature displayed on the LCI.

nviSpaceRhThis overrides the space humidity as obtained from the thermostat or sensor and is used by the controller for space humidity control and determination of free cooling. Writing to this variable is also reflected in the controller's output of the space humidity displayed on the LCI.

nviSupAirTempThis overrides the supply air temperature as obtained from the sensor and is used by the controller for supply temper-ature control. Writing to this variable is also reflected in the controller's output of the supply air temperature displayed on the LCI.

nviRetAirTempThis overrides the return air temperature as obtained from the sensor and is used by the controller for space tempera-ture control. Writing to this variable is also reflected in the controller's output of the return air temperature displayed on the LCI.

nviMixAirTempThis overrides the mixed air temperature as obtained from the sensor and is used by the controller for economizer con-trol. Writing to this variable is also reflected in the controller's output of the mixed air tempreature displayed on the LCI.

nviSupAirRhThis overrides the supply air humidity as obtained from the sensor and is used by the controller for humidification con-trol. Writing to this variable is also reflected in the controller's output of the supply air humidity displayed on the LCI.

nviAirFloThis overrides the air flow as obtained from the sensor (in any configuration) and is used by the controller for econo-mizer control. Writing to this variable is also reflected in the controller's output of the air flow rate displayed on the LCI.

nviSetpointThis overrides the setpoint as obtained from the thermostat, the LCI or from a pre-configured schedule. Writing to this variable will also be reflected in the controller's output of the effective setpoint as displayed on the LCI.

iWorx® DXUV


nviOccCmdThis overrides the occupancy as obtained from the thermostat. Writing to this variable is also reflected in the control-ler's output of the occupancy mode. Note that this is NOT the occupancy sensor. The occupancy sensor hardware input (OCC) is still displayed on the LCI based on its configuration.

nviResetRuntimeThis is a command to reset the fan, heating and cooling runtimes. If the value sent is 0, then no reset occurs; if the value sent is 1, then the runtimes are reset.

nviSysTimeThis is a time stamp to set the date and time. Writing to this variable changes the time on the device and affects all time-related functions such as schedules.

nviOutOverrideThis is a structure (defined inTable 8 on page 42) that overrides the hardware digital and analog outputs on the DXUV. These values allow the network controller to directly control the analog and digital outputs of the board.

NOTE: the DXUV makes no attempt to interpret the outputs; assigning meaningless outputs produces unpredictable results.

Table 7: Network Variable Inputs (NVIs)

Internal Variable Name Format Range DescriptionnviSpaceTemp SNVT_temp_p -29 to 230° F (-33 to 210° C) Space TemperaturenviSpaceRh SNVT_lev_percent 0 to 100% Space HumiditynviSupAirTemp SNVT_temp_p -29 to 230° F (-33 to 210° C) Supply Air TermperaturenviRetAirTemp SNVT_temp_p -29 to 230° F (-33 to 210° C) Return Air TemperaturenviSupAirRh SNVT_lev_percent 0 to 100% Supply Air HumiditynviAirFlow SNVT_flow 0 to 138,860 CFM (0 to 65535

LPS)Volumetric Air Flow Rate

nviSetpoint SNVT_temp_p -29 to 230° F (-33 to 210° C) Space SetpointnviOccCmd SNVT_occupancy 0 = occupied

1 = unoccupied 2 = bypass 3 = standby -1 = nul

Occupancy Command

nviResetRuntime SNVT_lev_disc 0 = no reset 1 = reset runtimes

Resets fan, heating and cooling runtimes

nviSysTime SNVT_time_stamp Date/Time System TimenviOutOverride See Table Structure Output Overrides

iWorx® DXUV


Table 8: Output Override Structure

InputsThe Inputs screen displays the current values of the DXUV’s inputs. These values cannot be changed.

Name Type/Range Default DescriptiondigOut[8] Unsigned Byte:

0=OFF1=ON0xFF=no override

0xFF0xFF0xFF0xFF0xFF0xFF0xFF0xFF

digOut[0] = TO1 (pin31) C1digOut[1] = TO2 (pin31) C2digOut[2] = TO3 (pin31) RVOdigOut[3] = TO4 (pin31) RVCdigOut[4] = TO5 (pin31) H1digOut[5] = TO6 (pin31) H2digOut[6] = TO7 (pin31) FANdigOut[7] = TO8 (pin31) HDFR

aOut[4] SNVT_lev_percent:0% to 100%32767=no override

32767327673276732767

aOut[0] = AO 0 (pin 37) ECNMaOut[1] = AO 1 (pin 35) HTGMaOut[2] = AO 2 (pin 34) CLGMaOut[3] = AO 3 (pin 32) FANM

fpOut[4] SNVT_lev_percent:0% to 100%32767=no override

32767327673276732767

fpOut[0] = unassignedfpOut[1] = unassignedfpOut[2] = unassignedfpOut[3] = unassigned

Input Range DescriptionOutside Temp -29 to 230 °F (-33.9 to 110 °C) The outside air temperature com-

municated through the LCI from the ASM/CSM controller.

Space Temperature -29 to 230 °F (-33.9 to 110 °C) Space temperatureReturn Air Temp -29 to 230 °F (-33.9 to 110 °C) Return air temperatureMixed Air Temp -29 to 230 °F (-33.9 to 110 °C) Mixed air temperatureSupply Air Temp -29 to 230 °F (-33.9 to 110 °C) Supply air temperatureSpace RH 0.00% to 100.00% Space air relative humiditySupply Air RH 0.00% to 100.00% Supply air relative humidityAir Flow Rate 0 to 138,860 CFM (0 to 65535 LPS) Air flow rateIn Enthalpy 0.0 to 60.0 BTU/lb. (0.0 to 129.6 kjoule/kg) Calculated inside air enthalpyOut Enthalpy 0.0 to 60.0 BTU/lb. (0.0 to 129.6 kjoule/kg) Calculated outside air enthalpyOcc. Ext. Time Rem. 0 to 60 min Extended occupancy time remain-

ingSmoke Detector Normal,

SmokeStatus of the smoke detector

Fan Status Off, On

Status of the fan proof switch

Low Limit Normal, Low Limit

Status of the low limit status switch

Filter Status Normal, Dirty

Status of the filter status switch

iWorx® DXUV


OutputsThis screen displays the current values of the DXUV’s outputs. These values cannot be changed.

Indoor Air Qual. Normal, Alarm

Status of the indoor air quality when configured for digital input

Occupance Mode Occupied, Unoccupied, Bypass

Occupancy mode of the controller

IAQ 0 to 4000 ppm Reading of the indoor air quality sensor when configured for analog input

Output Range DescriptionMode Heat,

Cool, Off, Fan, Free Cooling,Dehumid,Shut Down

Current operating mode.

Heat Output 0.00% to 100.00% Current state of the heating output.Cool Output 0.00% to 100.00% Current state of the cooling output.Economizer Output 0.00% to 100.00% Current state of the economizer output.Fan Output 0.00% or 100.00% Current state of the fan output.In Alarm? On, Off Alarm indicationEffective Setpt -29 to 230 °F (-33.9 to 110 °C) Effective SetpointReheat Close Off, On Reheat floating setpoint closeReheat Open Off, On Reheat floating setpoint openCool Stage 2 Off, On Cooling stage 2Cool Stage 1 Off, On Cooling stage 1Heat Stage 2 Off, On Heating stage 2Heat Stage 1 Off, On Heating stage 1Fan Enable Off, On Fan enableHumidifier Off, On Humidifier outputDay Of Week Not Set,

Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday

Day of week

Dehumid Reheat Pos 0.00% to 100.00% Reheat position

Input Range Description

iWorx® DXUV


Configuration

All SettingsDisplays all of the DXUV‘s setpoints and editable settings and provides access to edit all DXUV parameters from a sin-gle screen.

Setting Range Default DescriptionThermostat Structure Thermostat settingsSetpoints Structure Setpoint settingsSAT Setpoints Structure SAT SetpointsReset Setpoint Structure SAT setpoint reset settingsStaged Cooling Structure Staged cooling settingsModulated Cooling Structure Modulated cooling settingsFloating SP Cooling Structure Floating cooling settingsStaged Heating Structure Staged heating settingsModulated Heating Structure Modulated heating settingsFloating SP Heating Structure Floating heating settingsFan Settings Structure Fan settingsOA Control Setup Structure Outside air control settingsPressure Sensor Structure Pressure sensor settingsFlow Sensor Structure Flow sensor settingsVelocity Sensor Structure Velocity sensor settingsEconomizer Structure Economizer settingsFree Cooling Structure Free cooling settingsHumidification Structure Humidification settingsDehumidification Structure Dehumidification settings Floating SP Reheat Structure Dehumidification floating settingsDehumid Type Normal Dehumid,

Dehumid W/Reheat, Dehumid W/Heat

Normal Dehumid No reheat available Reheat using reheat valve output Reheat using heat output

IAQ Mode Digital, Analog

Digital Digital IAQ sensor Analog IAQ sensor

IAQ Settings Structure IAQ delay, temp reset, deadbandAnalog IAQ Sensor Structure Analog IAQ sensor settingsRuntime Limits Structure Runtime limits settingsAir Filter Alarm Off,

OnOff Air filter alarm is disabled,

Air filter alarm is enabledCutoff Temps Structure Cutoff temperature settingsDay Of Week Not Set,

Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday

Not Set Day of week setting

WDay Occ. Time Structure Weekday backup scheduleWDay Unocc. Time Structure Weekday backup scheduleWEnd Occ. Time Structure Weekend backup scheduleWEnd Unocc. Time Structure Weekend backup scheduleCommissioning Structure Commissioning control

iWorx® DXUV


ThermostatDisplays all of the thermostat settings and provides access to edit these parameters from a single screen.

SetpointsDisplays all of the setpoints and provides access to edit these parameters from a single screen.

SAT SetpointsDisplays all of the supply air temperature setpoints and provides access to edit these parameters from a single screen.

Setting Range Default DescriptionType SLink,

Precon III,Used for RH,Not Used

SLink TS302, TS304 or TS306TS100 (Precon III) thermistor0-10V / 0-100% RH sensorThermostat input is not used

Occupancy Extension 0 to 1000 min 60 min Thermostat occupancy extensionAlarm Temp Offset 0 to 10.0 °F

(0 to 5.6 °C)0 °F(0 °C)

Alarm temperature offset

Temperature Offset 0 to 10.0 °F(0 to 5.6 °C)

0 °F(0 °C)

Temperature offset, useful to cali-brate a Precon III sensor

Accumulated Ext Occ. 0 to 1000 min 0 min Accumulated occupancy extension time. (read only)

Setting Range Default DescriptionSetpoint 50.0 to 95.0 °F

(10 to 35 °C)71.0 °F(21.2 °C)

Setpoint for occupied time periods

Cooling Offset 0 to 10.0 °F(0 to 5.6 °C)

1.0 °F(0.6 °C)

Cooling setpoint offset added to setpoint

Heating Offset 0 to 10.0 °F(0 to 5.6 °C)

1.0 °F(0.6 °C)

Heating setpoint offset subtracted from setpoint

SP Adjust Limit 0 to 10.0 °F(0 to 5.6 °C)

2.0 °F(1.2 °C)

Maximum setpoint adjustment for occupied time periods.

Unocc Cooling 50.0 to 95.0 °F(10 to 35 °C)

82.0 °F(27.7 °C)

Cooling setpoint for unoccupied periods.

Unocc Heating 50.0 to 95.0 °F(10 to 35 °C)

60.0 °F(15.5 °C)

Heating setpoint for unoccupied periods.

Setting Range Default DescriptionCooling Setpoint 45.0 to 65.0 °F

(7.2 to 18.3 °C)55.0 °F(12.7 °C)

Supply Air Temperature Cooling Setpoint

Heating Setpoint 55 to 130.0 °F(12.7 to 54.4 °C)

90.0 °F(32.2 °C)

Supply Air Temperature Heating Setpoint

Supply Cool Limit 0 to 30.0 °F(-17.8 to -1.1 °C)

10.0 °F(-12.2 °C)

Supply Air Cooling alarm limit.

Supply Heat Limit 0 to 30.0 °F(-17.8 to -1.1 °C)

10.0 °F(-12.2 °C)

Supply Air Cooling alarm limit.

iWorx® DXUV


Reset SetpointDisplays all of the Supply Temp Reset settings and provides access to edit these parameters from a single screen.

Staged Heating/CoolingDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

Modulated Heating/CoolingDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

Setting Range Default DescriptionMin Differential 0.0 to 30.0 °F

(0.0 to 16.7 °C)0.0 °F(0.0 °C)

Zone temp - Zone SP differential, low end of SAT temp range.

Max Differential 0.0 to 30.0 °F(0.0 to 16.7 °C)

0.0 °F(0.0 °C)

Zone temp - Zone SP differential, high end of SAT temp range.

Cool Setp Low 45.0 to 65.0 °F(7.2 to 18.3 °C)

45.0 °F(7.2 °C)

SAT setpoint when zone temp is zone setpoint + Min Differential

Cool Setp High 45.0 to 65.0 °F(7.2 to 18.3 °C)

65.0 °F(18.3 °C)

SAT setpoint when zone temp is zone setpoint + Max Differential

Heat Setp Low 55.0 to 130.0 °F(12.8 to 54.4 °C)

80 °F(26.7 °C)

SAT setpoint when zone temp is zone setpoint + Min Differential

Heat Setp High 55.0 to 130.0 °F(12.8 to 54.4 °C)

130 °F(54.4 °C)

SAT setpoint when zone temp is zone setpoint + Max Differential

Setting Range Default DescriptionStages 0 to 2 (Heating)

0 to 2 (Cooling)2 (Heating) 2 (Cooling)

Number of heating or cooling stages controlled. Set to zero to disable staged heating or cooling.

Control Band 0 to 10.0 °F(0 to 5.56 °C)

1 °F(0.56 °C)

Value used to modify the calcu-lated heating/cooling setpoints to form the temperature range in which local heating/cooling is enabled.

Stage Time 0 to 255 minutes 5 minutes The rate at which stages are sequenced.

Stage Delay Thresh 0.00 to 100.00% 99.0% Second stage is delayed until mod-ulating first stage opens to this position.

Modulating Stage No Mod Stage, Stage 1 Mod, Stage 2 Mod

No Mod Stage Determines which stage modulates

Setting Range Default DescriptionKp 0.00 to 100.00% per °F 5.00% Proportional gain of the P+I control

loop.Ki 0.00 to 100.00% 0.05% Integral gain of the P+I control

loop.Out Min 0.0 to 10.0 V 0.0 V Minimum output voltage for modu-

lation.Out Max 0.0 to 10.0 V 0.0 V Maximum output voltage for modu-

lation. If set to 0, modulation is dis-abled.

iWorx® DXUV


Floating SP Heating/CoolingDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

Fan SettingsDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

OA Control SetupDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

Setting Range Default DescriptionKp 0.00 to 100.00% per °F 5.00% Proportional gain of the P+I control

loop.Ki 0.00 to 100.00% 0.05% Integral gain of the P+I control

loop.Travel Time 0.0 to 600 seconds 0 seconds Total time it takes for the valve to

travel from fully closed to fully open. If set to 0 floating point is dis-abled.

Deadband 0.0 to 100.00% 10% The desired setpoint must be this far or greater from the actual posi-tion before modulating the actuator.

Setting Range Default DescriptionType Auto,

On, Auto No Heat, Auto W/Radiant

Auto Auto: Fan is on when cooling or heating. On: Fan is on when occupied.Auto No Heat: Fan is on in when cooling, off when heating; if the economizer is enabled, the fan will function the same as the Auto mode.Auto w/Radiant: Fan is on when cooling, off when heating stage 1, on when heating stage 2; if the economizer is enabled, the fan will function the same as the Auto mode.

Voltage Range 0 to 5V, 0 to 10V

0 to 10V Voltage Range

Min Speed 0.0 to 100.0% 30% Minimum Fan SpeedControl Band 0 to 10 °F

(0 to 5.6 °C) 2.0 °F(1.1 °C)

Control Band

Setting Range Default DescriptionSensor Option Flow

VelocitydP UncalibrateddP CalibratedCALIBRATENot Used

Flow DP input has 0-10V Flow sensorDP input has 0-10V Velocity sensordP sensor using area and gaindp sensor using internal KconstantCalibrate dP sensor (calculate K)Not used

Calibration Flow 0 to 10,000 CFM 0 CFM Flow rate used in calibrationArea 0.00 to 35.95 sq ft 0 sq ft Cross-sectional area of ductSensor Gain 0.0 to 32.768 1.000 Sensor Gain (1.000 = no gain)

iWorx® DXUV


Pressure SensorDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

Flow SensorDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

Velocity SensorDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

EconomizerDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

Setting Range Default DescriptionMin Pressure 0.00 to 5.00 WC 0.00 WC Minimum pressure rangeMax Pressure 0.00 to 5.00 WC 3.00 WC Maximum pressure rangeMin Voltage 0.0 to 10.0 V 0.0 V Minimum voltage rangeMax Voltage 0.0 to 10.0 V 10.0 V Maximum voltage range

Setting Range Default DescriptionMin Flow 0.0 to 10,000 CFM 0.0 CFM Minimum flow rangeMax Flow 0.0 to 10,000 CFM 10,000 CFM Maximum flow rangeMin Voltage 0.0 to 10.0 V 0.0 V Minimum voltage rangeMax Voltage 0.0 to 10.0 V 10.0 V Maximum voltage range

Setting Range Default DescriptionMin Velocity 0.0 to 12,900 FPM 0.0 FPM Minimum velocity rangeMax Velocity 0.0 to 12,900 FPM 1,000 FPM Maximum velocity rangeMin Voltage 0.0 to 10.0 V 0.0 V Minimum voltage rangeMax Voltage 0.0 to 10.0 V 10.0 V Maximum voltage range

Setting Range Default DescriptionType Disabled,

Mod Unocc On,Mod Unocc Off

Disabled Disabled Modulate when Unocc and Occ Modulate if Occ, Off if Unocc

Mixed Air Setpoint 40.0 to 70.0 °F(4.4 to 21.1 °C)

55.0 °F(12.8 °C)

Mixed air setpoint.

Min Flow Rate 0 to 10,000 CFM 0 CFM Minimum air flow rateMin Temperature 40.0 to 70.0 °F

(4.4 to 21.1 °C)45.0 °F(7.2 °C)

When MAT drops below this tem-perature, the damper ignores flow rate minimum and closes.WARNING: Verify system freeze protection requirements before changing.

Min Position 0.00 to 100.00% 10.0% Minimum damper positionGain -4 to +5 0 Speed of economizer movementMin Voltage 0.0 to 10.0 V 0.0 V Minimum output voltage.Max Voltage 0.0 to 10.0 V 10.0 V Maximum output voltage.

iWorx® DXUV


Free CoolingDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

HumidificationDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

DehumidificationDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

Floating SP ReheatDisplays all of the floating point valve settings for dehumidification/reheat and provides access to edit these parameters from a single screen.

Setting Range Default DescriptionType Rtn Air Humidity,

Global Humidity,Dry Bulb Temp

Rtn Air Humidity Compare enthalpy / local RHCompare enthalpy / global RHCompare temp only, no RH

Enthalpy Offset 0.0 to 60.0 BTU/lb(0.0 to 139.6 kjoule/kg)

5.0 BTU/lb(11.6 kjoule/kg)

Difference between inside enthalpy and outside enthalpy that enables or disables the economizer.

Dry Bulb Offset 0.0 to 20.0 °F(0.0 to 11.1 °C)

5.0 °F (2.8 °C)

Difference between return temper-ature and outside temperature that enables or disables the econo-mizer.

Setting Range Default DescriptionType Occupied,

Always enabledOccupied Humidification when occupied

Humidification alwaysSpace RH Setpoint 0.00 to 100.00% 0% Min humidity setpoint for zoneSupply RH Limit 0.00 to 100.00% 80.0% Max humidity allowed in ductPurge Time 0 to 65535 sec 120 sec Time to purge ducts after humidifi-

cation has turned off

Setting Range Default DescriptionType Occupied,

Always enabledOccupied Dehumidification when occupied

Dehumidification alwaysSetpoint 0.00 to 100.00% 0% Dehumdification SetpointShutoff Offset 0.0 to 10.0 °F

(0.0 to 5.6 °C)2.0 °F (1.1 °C)

Hysteresis offset

Setting Range Default DescriptionReheat Setpt 50.0 to 95.0 °F

(10.0 to 35.0 °C)69.0 °F (20.6 °C)

Space temperature setpoint during reheat

Kp 0.00 to 100.00% (per °F) 5.00% Proportional gain of the floating point valve’s P+I control loop.

iWorx® DXUV


IAQ SettingsThis parameter structure shows the settings for the IAQ Alarm, settings include IAQ Alarm Delay time, Temp Reset Limit and Deadband.

Analog IAQ SensorIf the IAQ Mode is set to Analog, this parameter structure must be configured.

Runtime LimitsDisplays all of the settings for this category and provides access to edit these parameters from a single screen.

Ki 0.00 to 100.00% 0.05% Integral gain of the floating point valve’s P+I control loop.

Travel Time 0 to 600 sec 0 sec Total time it takes for the floating point heating valve to travel from fully closed to fully open. If set to 0, floating point valve is disabled.

Deadband 0.00 to 100.00% 10% The desired setpoint must be this far or greater from the actual position before modu-lating the actuator.

Setting Range Default DescriptionIAQ Delay Time 0 to 1000 Min 5 Min Time the Alarm is delayed.Temp Reset Limit 0 to 15 °F

(0 to 8.3 °C)4.0 °F(2.2 °C)

Temperature Reset Limit to ensure comfort temperature during IAQ Alarm conditions.

Deadband 0 to 400 ppm 0 ppm Deadband for hysteresis control.

Setting Range Default DescriptionMin 0 to 4000 ppm 0 ppm Minimum ppm sensor settingMax 0 to 4000 ppm 4000 ppm Maximum ppm sensor settingSetpoint 0 to 4000 ppm 2000 ppm SetpointOffset 0 to 4000 ppm 0 ppm Offset to the sensor reading

Setting Range Default DescriptionCooling 0 to 65,535 hours 1000 hours Runtime limit for cooling after

which a maintenance alarm is gen-erated.

Heating 0 to 65,535 hours 1000 hours Runtime limit for heating after which a maintenance alarm is gen-erated.

Fan 0 to 65,535 hours 1000 hours Runtime limit for fan after which a maintenance alarm is generated.

Setting Range Default Description

iWorx® DXUV


OAT CutoffThe OAT cutoff temperatures are temperatures above or below heating or cooling function is disabled and the econo-mizer is reduced to the MinAir position. A value of -4 °F disables the Min or Max cutoff temperature settings. All other values within the range are valid cutoff temperatures.

Backup Occ Time/ Backup Unocc TimeThe Backup time for Unoccupied and occupied mode is stored in the controller.

CommissioningDisplays all of the commissioning settings and provides access to edit these parameters from a single screen.

Setting Range Default DescriptionMax OAT Heat -7.6 to 122 °F

(-22 to 50 °C)-4 °F(-20 °C)

Outside Air Temperature above which heating is disabled.

Min OAT Cool -7.6 to 122 °F (-22 to 50 °C)

-4 °F(-20 °C)

Outside Air Temperature below which cooling is disabled.

Max OAT Econ -7.6 to 122 °F (-22 to 50 °C)

-4 °F(-20 °C)

Outside Air Temperature above which economizer is disabled.

Min OAT Econ -7.6 to 122 °F (-22 to 50 °C)

-4 °F(-20 °C)

Outside Air Temperature below which economizer is disabled.

SAT Cooling Limit 45 to 65 °F (7.2 to 18.3 °C)

55 °F(12.8 °C)

Supply air temperature below which additional cooling is not enabled.

Setting Range Default DescriptionHours 0-23 0 Hour to start occupancy/unoccu-

pied times.Minutes 0-59 0 Minute to start occupancy/unoccu-

pied times.

Setting Range Default DescriptionEnable No,

YesNo Commissioning values disabled

Commissioning values enabledMod Fan 0.00 to 100.00% 0.00% Modulated fan overrideMod Cooling 0.00 to 100.00% 0.00% Modulated cooling overrideMod Heating 0.00 to 100.00% 0.00% Modulated heating overrideMod Economizer 0.00 to 100.00% 0.00% Modulated economizer overrideHumidifier Off or On Off Humidifier overrideFan Enable Off or On Off Fan enable overrideHeating Stage 0 to 2 0 Heating stage overrideReheat Open Off or On Off Reheat open overrideReheat Close Off or On Off Reheat close overrideCooling Stage 0 to 2 0 Cooling stage override

iWorx® DXUV


AlarmsThe table below describes the alarms you may encounter and how they are reset.

TROUBLESHOOTING

Diagnostic LEDsThe controller has 3 LED indicators. These indicators can aid in troubleshooting equipment operation problems. The following table lists the functions of the controller’s LEDs in the order they appear from left to right on the unit.

Alarm Range Alarm Trigger Alarm ResetFan Failure Normal, Alarm Occurs when the fan input detects

that the fan is not running after a 30-second grace period after the fan has been activated.

The cause of the emergency condition must be resolved and the controller must be reset.

Smoke Normal, Alarm Occurs when the smoke alarm input detects the presence of smoke.


Space Temp Normal, Alarm Occurs when the space tempera-ture exceeds the specified high limit or drops below the specified low limit.

Automatic when space temperature returns within its normal range.

Mixed Air Low Limit Normal, Alarm Occurs when the mixed air tem-perature drops below the Low Limit that has been set, indicating a freeze condition.


Filter Normal, Alarm Occurs when the Filter Alarm input detects that the filter needs to be replaced.

Automatic when the dirty filter is replaced.

Indoor Air Quality Normal, Alarm Occurs when the IAQ sensor detects inadequate indoor air qual-ity.

Automatic when air quality returns within normal parameters.

Heating Failure Normal, Alarm Occurs when Supply Air tempera-ture is Supply Heat Limit degrees from the setpoint 10 minutes after entering heating mode.

The cause of the emergency condition must be resolved.

Cooling Failure Normal, Alarm Occurs when Supply Air tempera-ture is Supply Cool Limit degrees from the setpoint 10 minutes after entering cooling mode.


Heat Stuck On Normal, Alarm Occurs when the mode is primary off or primary fan only if the supply air temperature does not drop below 150 °F after five minutes.


Maintenance Normal, Alarm Occurs when the fan, heating, or cooling operating hours have exceeded their Runtime limit.

To clear the alarm, a user must enter a new value for the alarm limit or reset the accumulated times to zero.

iWorx® DXUV


Figure 15: DXUV Controller LEDs

Status Network Service

Troubleshooting TipsThis section provides remedies for common problems.

LED IndicationStatus – Solid green when running and configured by an LCI (networking)

– Flashing green when running and NOT configured by an LCI (stand-alone)– Solid red when a fault condition exists (control shut down)– Blinking Red - the controller has a device failure– Solid Amber - The controller has not received a LCI ping message in over 10 minutes and is part of a network.

Network – Yellow while the controller is transmitting data onto the FTT-10A network – Green when there is network activity– Off when there is no network activity

Service – Illuminated when the service pin is depressed or when a controller gets configured by the LCI.

Problem SolutionController is not running and Status LED is not illuminated.

No power to controller. Verify the voltage on the controller’s power connector (24 VAC).

How do I reset the controller? The controller can be reset by the LCI, or you can cycle power to the controller. Refer to the LCI documentation for more infor-mation on resetting the controller using the LCI.

Can my iWorx® system contain multiple DXUV controllers?

Yes, provided that you do not exceed the maximum number of controllers that can be handled by the Local Control Interface (LCI).

iWorx® DXUV


Getting HelpComponents within an iWorx® controller, sensor, or power supply cannot be field repaired. If there is a problem with a unit, follow the steps below before contacting your local TES representative or TES technical service.

1.Make sure controllers, sensors, and power supplies are connected and communicating.2.Record precise hardware setup indicating the following:

Version numbers of application software.

Device and/or firmware version number.

A complete description of difficulties encountered.

Notes:

Thermistor readings fluctuate rapidly, some-times by several degrees.

The controller is not properly grounded. The controller’s ground (GND) pin (T40) must be connected to earth ground.

The fan is running and there is no call for heat-ing or cooling. Why?

If there is an economizer and it is configured to maintain a mini-mum flow, it does so throughout the occupied period regardless of heating or cooling demand.

Why do I need to use a SAT sensor? A SAT sensor is necessary because the controller uses the sensor to measure the air being delivered to the space. Remember staging is enabled only by the space temp, which is controlled by the SAT.

Problem Solution

iWorx® DXUV

Printed in the USA iWorx® and iView® are registered trademarks of Taco Electronic Solutions, Inc. © 2015 Taco Electronic Solutions, Inc. LON, LONWORKS, & LONMARK are trademarks of Echelon Corporation

CONTROLS MADE EASY®

Taco Electronic Solutions, Inc., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.

Taco (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.

Taco Electronic Solutions, Inc. is a subsidiary of Taco, Inc. Visit our web site at: http://www.taco-hvac.com

Taco Electronic Solutions, Inc. (TES) will repair or replace without charge (at the company's option) any product or part which is proven defective under normal use within one (1) year from the date of start-up or one (1) year and six (6) months from date of shipment (whichever occurs first).

In order to obtain service under this warranty, it is the responsibility of the purchaser to promptly notify the local TES stocking distribu-tor or TES in writing and promptly deliver the subject product or part, delivery prepaid, to the stocking distributor. For assistance on war-ranty returns, the purchaser may either contact the local TES stocking distributor or TES. If the subject product or part contains no defect as covered in this warranty, the purchaser will be billed for parts and labor charges in effect at time of factory examination and repair.

Any TES product or part not installed or oper-ated in conformity with TES instructions or which has been subject to accident, disaster, neglect, misuse, misapplication, inadequate operating environment, repair, attempted repair, modification or alteration, or other abuse, will not be covered by this warranty.

TES products are not intended for use to sup-port fire suppression systems, life support sys-tems, critical care applications, commercial aviation, nuclear facilities or any other applica-tions where product failure could lead to injury to person, loss of life, or catastrophic property damage and should not be sold for such pur-poses.

If in doubt as to whether a particular product is suitable for use with a TES product or part, or for any application restrictions, consult the applicable TES instruction sheets or in the U.S. contact TES at 401-942-8000 and in Canada contact Taco (Canada) Limited at 905-564-9422.

TES reserves the right to provide replacement products and parts which are substantially sim-ilar in design and functionally equivalent to the defective product or part. TES reserves the right to make changes in details of design, con-struction, or arrangement of materials of its products without notification.

TES OFFERS THIS WARRANTY IN LIEU OF ALL OTHER EXPRESS WARRANTIES. ANY WARRANTY IMPLIED BY LAW INCLUDING

WARRANTIES OF MERCHANTABILITY OR FITNESS IS IN EFFECT ONLY FOR THE DURATION OF THE EXPRESS WARRANTY SET FORTH IN THE FIRST PARAGRAPH ABOVE.

THE ABOVE WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR STATUTORY, OR ANY OTHER WARRANTY OBLIGATION ON THE PART OF TES.

TES WILL NOT BE LIABLE FOR ANY SPE-CIAL, INCIDENTAL, INDIRECT OR CONSE-QUENTIAL DAMAGES RESULTING FROM THE USE OF ITS PRODUCTS OR ANY INCI-DENTAL COSTS OF REMOVING OR REPLACING DEFECTIVE PRODUCTS.

This warranty gives the purchaser specific rights, and the purchaser may have other rights which vary from state to state. Some states do not allow limitations on how long an implied warranty lasts or on the exclusion of incidental or consequential damages, so these limitations or exclusions may not apply to you.

LIMITED WARRANTY STATEMENT

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