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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Technical Service Fax 1-630-260-7294

Customer Service 1-800-304-6563

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Cross Reference: www.uni-line.com/modules/xref/xrefsearch.aspx

Toolbox: www.ToolBox.InvensysControls.com

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