User Manual

ManualsBrandsRobertshaw ManualsIndustrial & ScientificLine Voltage Thermostat, 24 VAC

INSTALLATION DATA

ETC SINGLE STAGE ELECTRONIC

TEMPERATURE CONTROL

The Ranco® ETC is a microprocessor-based

family of electronic temperature controls,

designed to provide on/o control

for commercial heang, cooling, air

condioning and refrigeraon. The ETC

is equipped with a liquid crystal display

(LCD) that provides a constant read

out of the sensed temperature, and a

touch keypad that allows the user to

easily and accurately select the setpoint

temperature, dierenal and heang/

cooling mode of the operaon. Models

are available that operate on either line

voltage (120/208/240V AC) or low voltage

(24V AC).

APPLICATIONS

With its wide temperature setpoint range

and selectable heang or cooling modes,

the ETC can be used for a wide variety of

applicaons including refrigerated display

cases, walk-in and reach-in refrigerators,

milk coolers, refrigerated warehouses,

chillers, beer and beverage coolers,

tank heang, space and return air temperature

controls and condenser fan cycling.

FEATURES

• Wide setpoint temperature range (-30°F to 220°F) and dierenal

adjustment (1°F to 30°F)

• Simple keypad programming of setpoint temperature, dierenal

and cooling/heang modes

• LCD display readout of sensor temperature, control sengs,

relay status and onboard diagnoscs

• LED (Light Eming Diode) backlight to improve visibility of the display

in low light ambient applicaons.

• IP67 rated (water and dust resistant) thermistor-based probe to

remotely monitor temperature

• The sensor probe can be retroed in the eld by the use of factory

installed interconnect

• Remote temperature sensing up to 400 feet

• SPDT output relay

• User-selectable Fahrenheit/Celsius scales

• Lockout switch to prevent tampering by unauthorized personnel

• Choice of line voltage and low voltage models available

• Oponal 0 to 10 volt analog output available for remote temperature

indicaon

• An-short Cycle Compressor Delay for cooling applicaons

SPECIFICATIONS

Input Voltage 120 or 208/240V AC (24V AC oponal), 50/60 Hz

Temperature Range -30°F to 220°F

Dierenal Range 1°F to 30°F

Switch Acon SPDT

Sensor Thermistor, 1.94in. long x 0.25 in. diameter with

8 . cable, IP67 rated

Power Consumpon 120/208/240V AC: 100 Milliamps

24V AC: 2 - 6 VA

Relay Electrical Rangs 120V 208/240V

NO Contact

Full-load Amps 16 Amps 8 Amps

Locked rotor Amps 96 Amps 48 Amps

Resisve Amps 15 Amps 8 Amps

Horsepower 1 HP 1 HP

NC Contact

Full-load Amps 5.8 Amps 2.9 Amps

Locked rotor Amps 34.8 Amps 17.4 Amps

Resisve Amps 5.8 Amps 2.9 Amps

Horsepower 1/4 HP 1/4 HP

Pilot Duty: 125 VA at 120/208/240V AC

Control Ambient Temperature

Operang -20°F to 140°F (-29°C to 60°C)

Storage -40°F to 176°F (-40°C to 80°C)

Ambient Humidity 0 to 95%, RH, Non-condensing

0 to 10V Output Impedance 1K

Enclosure NEMA 1, Plasc

Agency Approvals UL Listed, File E94419, Guide XAPX

CSA Cered, File LR68340, Class 4813 02

ETC ORDERING INFORMATION

Uni-Line OEM Input No. of 0 - 10 V

Numbers Numbers Voltage Stages Output

ETC-111000-000 ETC-111020-000 120/240 1 No

ETC-111100-000 ETC-111120-000 120/240 1 Yes

ETC-112000-000 ETC-112020-000 24 1 No

ETC-112100-000 ETC-112120-000 24 1 Yes

OPERATION

Liquid Crystal Display (LCD)

The LCD display provides a constant read out of the sensor temperature

and indicates if the output relay is energized. When the S1 annunciator

is constantly illuminated during operaon, the relay is energized. The

display is also used with the keypad to allow the user to adjust the

setpoint temperature, dierenal and heang/cooling modes.

Backlight

When any of the 3 mode keys are pressed, the backlight is acvated

and the ETC is in control mode. Press the SET key to begin program

mode.

Control Setup

The temperature setpoint refers to the temperature at which the

normally open (NO) contacts of the output relay will open. Determine

the load (s) to be controlled and the operang mode required, cooling

or heang. Refer to Figure 1 for a visual representaon.

• When the cooling mode is chosen, the dierenal is above the

setpoint. The relay will de-energize as the temperature falls to the

setpoint.

• An-short Cycle Compressor Delay for cooling. Aer a relay

de-energizes, the ETC will prevent the relay from turning on unl a

congurable me has occurred to protect compressor.

• When the heang mode is chosen, the dierenal is below the

setpoint. The relay will de-energize as the temperature rises to the

setpoint.

Summary of content (6 pages)

PAGE 1
INSTALLATION DATA ETC SINGLE STAGE ELECTRONIC TEMPERATURE CONTROL Relay Electrical Ratings The Ranco® ETC is a microprocessor-based family of electronic temperature controls, designed to provide on/off control for commercial heating, cooling, air conditioning and refrigeration.
PAGE 2
Step Annunciator 1 F or C Fahrenheit or Celsius Scale 2 S1 (blinking) Setpoint Temperature 3 DIF 1(blinking) Differential Temperature 4 C1/H1 Cooling or Heating Mode 5 D1 Description Display Cooling Delay Set to 1-20 Minutes Figure 1: Setpoint and Differential Settings. Diagram indicates relay on and off points in either the heating or cooling modes NOTE: The ETC will automatically end programming if no keys are depressed for a period of thirty seconds.
PAGE 3
TROUBLESHOOTING ERROR MESSAGES INSTRUCTIONS CONCERNANT L’INSTALLATION Display Messages AVERTISSEMENT E1 A ppears when either the up Ç or down È key is pressed when not in the programming mode. To correct: If the E1 message appears even when no keys are being pressed, replace the control. E2 A ppears if the control settings are not properly stored in memory. To correct: Check all settings and correct if necessary.
PAGE 4
CONTROL MOUNTING CONTROL WIRING Mount the ETC to a wall or any flat surface using a combination of any two or more of the slotted holes located on the back of the control case. The control’s components are not position sensitive, but should be mounted so that they can be easily wired and adjusted. Avoid excessive conditions of moisture, dirt, dust and corrosive atmosphere. The ETC has provisions for 1/2 inch conduit connections.
PAGE 5
Figure 7: Typical Wiring Diagram for 24V AC Power Input and Line Voltage Switching. Figure 4: Typical Voltage Wiring Diagram. Figure 8: 0-10 V Analog Output Located on Power (Lower) Circuit Board. Figure 5: Typical Wiring Diagram for 24V AC Power Input and Line Voltage Switching. FIELD REPAIRS Field calibrating or repairs to the ETC control must not be attempted. Sensors and replacement controls are available through Ranco wholesalers.
PAGE 6
EXTENDING SENSOR CAUTION: Sensor wiring splices may be made external from the control. CAUTION: Disconnect power to control before wiring to avoid possible electrical shock or damage to the controller. Additional cable can be spliced to the sensor cable to increase the length beyond the standard 8 feet. It can be extended up to 400 feet. The cable should be at least 22 AWG or larger to keep additional resistance to a minimum.