uni-line product knowledge for rsu temperature controls
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Uni-lineTRANSCRIPT
TEMPERATURE CONTROLS
Robertshaw® proprietary and confidential ©2014 1
Refrigeration Overview Refrigeration System Basics Differentials Cut-in and Cut-outs Capillary Tubes
ETC Product Features Cold Controls Troubleshooting Literature Website Q&A
Feature Sets Electronic Accuracy Wide Range (-30° to 220°F) Wide Differential Selection Easy Installation Easy Programming Clear Temperature Display No Jumpers Contractor Preferred Sensor up to 400 Feet Averages Multiple Sensors
Applications Ice Machines Reach-In Refrigerator/Freezers Walk-In Refrigerator/Freezers Beverage Coolers Condensing Units Display Cases
It Just Makes Sense™
Scientific principals are same, however refrigeration systems are: Operation Time 24 / 7 Defrost Cycles Load Changes
Energy Conservation Important on A/C Systems However, more critical on Commercial
Refrigeration Applications
Defrost Control
Temperature Control
Pressure Control
Narrow Differential (10°F or less) When a narrow differential is desired Closely maintain within 5 to 6°F Typically used for air sensing applications
Wide Differential (10°F or more) Required due to swing in evaporator temperatures
between compressor ON and OFF Household refrigerators and room air conditioners Typically used to sense evaporator coil temperature
Differentials
Cut-out mode: Differential is above set point Output relay energizes when temperature rises to set point plus the
differential value When temperature drops to set point, the relay de-energizes
Cut-in mode: Differential is below set point The output relay energizes when the temperature rises to set point When the temperature drops to setpoint minus the differential value, the
relay de-energizes
Constant cut-in controls (A30 series) Designed for frost free refrigerators Used in coolers and display cases
Differential cut-in controls (A12 series) This type of control offers an adjustable differential Rotating the dial indicator to the colder position changes the
cut-out temperature only and widens the differential
Capillary tube The gas within the capillary tube reacts to temperature changes Actuates the power element diaphragm to trip the toggle
mechanism
Desired Temp
(Cut-Out Mode)
Desired Temp
(Cut-In Mode)
Two Types of Cold Controls: Constant Differential Constant Cut-in Applications Water coolers Beverage dispensers Display cases Constant Differential also called “straight range controls” Designed for household refrigerators and freezers
Capillary-only bellows sense from the coldest exposure point Capillary with bulb senses from the bulb only The bulb portion of the A22 & A30 capillaries must be
mounted with tip end pointing upward within 65° of vertical Sensing elements of A22 & A30 contain saturated vapor liquid
refrigerant and are sensitive to barometric pressure changes Sensing elements C12 & C17 contain liquid filled bulbs for
accurate temperature control C12 & C17 bulbs may be oriented in any position
Limited vapor-fill sensing element Sense directly by the capillary May be used where the desired sensing is at the coldest point
along the capillary (including the control body itself) Entire control located where it will sense fixture temperature
Ice Machines Display Cases Reach-In Refrigerator/Freezers Walk-In Refrigerator/Freezers Beverage Coolers Condensing Units
Electronic Accuracy
Wide Range (-30° to 220°F)
Wide Differential Selection
Easy Installation
Easy Programming
Clear Temperature Display
No Jumpers
Contractor Preferred
Sensor up to 400 Feet
Averages Multiple Sensors
Retail store display freezers and reach-in coolers
Supermarket display cases for produce/meats
Retail store walk-in coolers and freezers
Boiler operating control (used as a thermostat)
Condenser fan cycling or staging
Cooling tower pump and fan control
Space and return air temperature control
Bulk milk coolers
Poultry houses and livestock barns
It Just Makes Sense™
Part Number Voltage (AC) Stages Enclosure
ETC-111000-000 120/240 1 Standard
ETC-112000-000 24 1 Standard
ETC-212000-000 24 2 Standard
ETC-211000-000 120/240 2 Standard
ETC-141000-000 120/240 1 NEMA 4X
Microprocessor based electronic temperature control
Designed to provide ON and OFF control for commercial HVACR
Ranco® Electronic Temperature Control is Easier to Use!
No jumpers required
Simple programming
Johnson A419
Short cycle protection
Optional external setpoint change switch
LED lights when relay energized
Includes 3 configuration jumpers
Hard to remember programming
Johnson Controls – Penn
White-Rodgers
Saganomia (Danfoss)
G.E. - Art series
Asian knock-offs
Sunne Peco
Ranco®
A and CC Series
K and RC Series
9500 Series Cold Controls
3030 Series Uni-Kits
Ice Maker
Ice Bin Level Control
Ice Harvest
Commercial Refrigeration
Household
Water Coolers
Cold Control
Order Cold Control Sell Sheet English and Spanish 150-2300
Order Commercial Refrigeration Brochure
150-2282
Mount unit to wall or flat surface
Review typical line voltage wiring diagram
Determine location of sensor
Program 4 simple steps
Instructions for wiring:
Open case by removing four screws
Connect black wire to COM
Connect white wire to 120 or 240
Attach common wire
Connect voltage to NO or NC switch
Close case and screws closed
Setting up Temperature Control is as Easy as 1-2-3-4!
1. Set, °F or °C
2. Set, S1 (setpoint) 70°
3. Set, DIF1 (differential) 5°
4. Set, C1 (cooling) or H1 (heating)
Done!
E1 appears when up or down keys are pressed If E1 appears when no keys are being pressed, replace the control
E2 appears if control settings are not properly stored in memory Check all settings and correct if necessary
EP appears when the probe is open, shorted or sensing a temperature that is out of range Check if the sensed temp is out of range. If not, check for probe damage by comparing it to a known ambient
temp between -30° F and 220° F. Replace the probe if necessary.
EE appears if the EEPROM data has been corrupted This condition cannot be field repaired. Replace control
CL appears if calibration mode has been entered. Remove power to the control for at least five seconds. Reapply power. If CL message still appears, replace control
What is the temperature range of the Ranco® Electronic Temperature Control (ETC)?
A. -50°F to 0°F
B. -30°F to 220°F
C. -30°C to 220°C
What voltages are available within the ETC family of products?
A. 120V AC
B. 240V AC
C. 24V AC
D. All of the above
What rule of heat transfer is mostly used in refrigeration?
A. Conduction
B. Convection
C. Radiation
© Invensys 2014 32
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