ClimaDry II

RETURN WATER

(TO WATER LOOP)

SUPPLY WATER

(FROM WATER LOOP)

HOTGASREHEAT VALVE

WATER COIL

REVERSING VALVE

COMPRESSOR

TXV

ENTERING AIR

CHECK VALVE

CHECK

AIR COIL

LEAVING AIR

º

VALVE

utilized. No unusual refrigerant pressures occur during the reheat mode. There is no requirement for antifreeze in the reheat circuit.* The refrigerant circuit is identical to a standard ClimateMaster unit (without reheat). Plus, the water loop portion of a ClimaDry® II unit is simple and easy to understand. CLIMADRY® II APPLICATIONSThe ClimaDry® II option can be applied to a number of common applications, such as:• Classrooms • Computer rooms • Spaces with high latent loads like

auditoriums,theaters,convention centers, etc. • Most anywhere humidity is a problem

OVERVIEWIndoor Air Quality (IAQ) and Relative Humidity (RH) are increasingly becoming design issues that must be addressed by selecting heating and cooling equipment with advanced capabilities. The ClimateMaster ClimaDry® II reheat and dehumidification option offers unique features unlike anything currently available today.

The patented ClimaDry® II option is an innovative means of providing fully modulating reheat without the complication of intricate refrigeration controls. ClimaDry® II is a form of Hot Gas Generated Reheat, which utilizes one of the biggest advantages of a water source heat pump (WSHP), the transfer of energy through the water piping system. ClimaDry® II simply diverts condenser water through a water-to-air coil that is placed after the evaporator coil.

CLIMADRY II BENEFITSClimaDry® II is like no other reheat option on the market. Proportional reheat is controlled to the desired leaving air temperature setpoint (factory setpoint of 72°F) no matter the water loop temperature. If condenser water is not warm enough, the internal circulating loop increases the water temperature with each pass through the condenser coil. Since dehumidification operation will occur under less than full load cooling conditions a good percentage of the time, it is important to have a reheat function that provides 100% reheat in the spring and fall when the water loop is cool.

Competitors without the ClimaDry® II option typically use an on/off (non-modulating) refrigeration based reheat circuit, typically referred to as “Hot Gas Reheat” (HGR). By passing the hot discharge gas from the compressor through an air coil, these systems do provide the ability to reheat the leaving air. However, these systems must rely on complex controls to operate and contain many additional valves and complex piping schemes. In addition, the performance of HGR units typically fluctuates with the outside air temperature and thus provides a varying amount of dehumidification. Rarely will a HGR unit provide 100% reheat and provide supply air at a neutral temperature, like a ClimaDry® II system.

The simplicity of the ClimaDry® II circuit makes it incredibly easy to maintain. No refrigerant switching valves or hard to diagnose leaky check valves are

THE CLIMATEMASTER CLIMADRY® II REHEAT AND DEHUMIDIFICATION OPTION

Figure 1 - Typical Hotgas Reheat Circuit

Figure 2 - ClimaDry® II Circuit

RETURN WATER (TO WATER LOOP)

SUPPLY WATER

(FROMWATER LOOP)

MODULATINGMIXING VALVE

INTERNAL CIRCULATING

PUMP

WATER COIL

REVERSING VALVE

COMPRESSOR

TXV

ENTERING AIR

AIR COIL

LEAVING AIR

REHEAT COIL

º

º

Modulating mixing valve automatically adjusts reheat capacity based upon leaving air temperature and loop entering water temperature to provide 100% reheat and “neutral” supply air

Standard DXM2 control takes input from either a humidistat or dehumidistat and controls the reheat function by interfacing with the modulating reheat valve

REHEAT FUNCTIONWith the ClimaDry® II option, the return air from the space is conditioned by the air-to-refrigerant (evaporator) coil, and then reheated by the water-to-air (reheat) coil to dehumidify the air, but maintain the same space temperature. The moisture removal capability of the heat pump is determined by the unit’s latent capacity rating.

UNIT FEATURES• Fully modulating reheat for precise control of

supply air temperatures • 100% reheat to operate as a dehumidifier• “Neutral” 72°F supply air temperature even at part

load (non-design) conditions • Supply air temperature adjustable from 69°F to

75°F with optional potentiometer• Specially designed freeze-resistant reheat circuit

does not require antifreeze*• Integrated reheat controls - simply attach a

humidistat or dehumidistat • Microprocessor (DXM2) controls standard • Simple AHRI certified refrigeration circuit • All water system eliminates refrigeration circuit

modifications (same refrigeration circuit as units without ClimaDry® II)

• Stable refrigeration pressures, even at low entering water temperatures • All components located inside the cabinet • Two-speed fan (direct drive units) automatically

controlled for increased latent capacity in reheat mode

AVAILABILITYThe ClimaDry® II option is currently available on ClimateMaster Tranquility® 30 (TE) Series, Tranquility® 20 (TS) Series, Tranquility® Large (TL) Series, and Tranquility® (TR) Series units.

*Antifreeze may be required for normal operation depending on location but not specifically for ClimaDry® II operation.

Standard evaporator coil

Reheat coil reheats the cool dehumidified air to “neutral” supply temperature

Separation between evaporator coil and reheat coil to allow maximum moisture removal

O = Optional S = Standard * microchannel coils standard on sizes 026 - 049, tube/fi n coils standard on 064 - 072 ** tube/fi n coils standard on all sizes except 024 to 048 which have microchannel coils 1 Desuperheater optional on sizes 036 - 120 2 DXM2 required for ECM-CV 3 front return units come standard with 3/8” washable fi lter, bottom returns have 1” standard fi lter

U N I T F E AT U R E S

Product Series

Standard Features & Options

CXM

DXM

DXM

2 (i-gate)

PSC

High Static PSC

Blow

er

ECM

-CT

ECM

-CV

Belt D

rive Fan

Dual Level Com

pressor V

ibration Isolation

Dow

nfl ow Confi guration

Field Convertible Discharge

(Horizontal)

Multiple A

ccess Panels

Factory Installed Hangar B

rackets (H

orizontal)

Rem

ote Reset at Therm

ostat

Condensate Overfl ow

Protection

Copper Water Coil

Cupro Nickel Coil

Brazed Plate

Ultraquiet (M

ute) Package

Extended Range Insulation

Desuperheater Coil (H

WG

)

DD

C

Microchannel A

ir Coils

Tube/Fin Air Coils

Tin Plated Tube/Fin Air Coils

E-coated Tube/Fin Air Coil

Clim

adry (requires DXM

2 Control)

Service Disconnect

Internal Secondary Pump

Auto-fl ow

Water R

egulation

Two-W

ay Control Valve

Vfl ow

Modulating W

ater Valve

vfl ow® Internal Variable

Water fl ow

Pump

Water Side Econom

izer

Hydronic H

eat

3/8” Washable

1” Filter

2” Filter

4” Filter

Filter Rail

Filter Frame w

ith Duct Collar

Tranquility® 30 Digital Two-Stage (TEH/V) S S S O S S S S S S O O O O O S* S* O O O O O O S O S O

Tranquility® High Effi ciencyTwo-Stage (TZH/V) S S S S S S S S S O O O O O S O O O S O S O S O

Tranquility® 20 Single-Stage (TSH/V) S O S O O S O S S S S S S O O O O O S** S** O O O O O O S O S O

Tranquility® 16 Compact (TCH/V) S O O² S O O O S S S S S S S O O O O S O O O S O S OTranquility® High Effi ciency (TRH/V) S O O² S O O O S S S S S S S O O O O S O O O O O O O S O S O

Tranquility® 22 High Effi ciencyTwo-Stage (TYH/V) S S S S S S S S S O O O O S O O S O S O

Tranquility® Vertical Stack (TSM) S O S O O S S S S O O O O S O O O O O O S O STranquility® Vertical Stack (TSL) S O S O O S S S S O O O O S O O O O O O O S O STranquility® Large (TL) S O S S S S S O O O O S O O O O O S O O STranquility® Compact Belt Drive (TCH Large) S O S S S S S O O O O S O O S O O S

Tranquility® Compact Belt Drive (TCV Large) S O S S S S S O O O O S O O S O S

Tranquility® Console (TRC) S O S S S S O O O O O O O O O S³ S³Tranquility® Rooftop (TRE) S O S S S S S S O O O S O O O O O S OTranquility® Rooftop (TRT) S S S S S S S O O O S O O O O O O S OTranquility® Modular Water-to-Wa-ter (TMW) 036 - 340 S O S S S O O O O¹ O O

Tranquility® Modular Water-to-Wa-ter (TMW) 360 - 840 S S S S O

ClimateMaster works continually to improve its products. As a result, the design and specifications of each product at the time for order may be changed without notice and may not be as described herein. Please contact ClimateMaster’s Customer Service Department at 1-405-745-6000 for specific information on the current design and specifications. Statements and other information contained herein are not express warranties and do not form the basis of any bargain between the parties, but are merely ClimateMaster’s opinion or commendation of its products.

LC360 © ClimateMaster, Inc. 2010 Rev.: Aug 11, 2020

7300 S.W. 44th StreetOklahoma City, OK 73179

Phone: 405-745-6000Fax: 405-745-6058

climatemaster.comCLIMADRY®