Ranco ETC-211000-000 Installation Instructions

R A N C O
ETC TWO STAGE ELECTRONIC TEMPERATURE CONTROL

PRODUCT DESCRIPTION

The Ranco ETC is a microprocessor-based family
of electronic temperature controls, designed to
provide on/off control for commercial heating, cool-
ing, air conditioning and refrigeration. The ETC is
equipped with a liquid crystal display (LCD) that
provides a constant readout of the sensed tem-
perature, and a touch keypad that allows the user
to easily and accurately select the set point tem-
perature, differential and heating/cooling mode of
the operation. Models are available that operate
on either line voltage
(120/208/240 VAC) or low voltage (24VAC).
APPLICATIONS
With its wide temperature
setpoint range and selectable
heating or cooling modes, the
ETC can be used for a wide variety of
applications including multiple
compressor control, two stage heating,
ventilation control, automatic changeover, condenser fan cycling,
space and return air temperature control, water cooled condensers
and control with alarm funtion.
FEATURES
•
Wide setpoint temperature range (-30°F to 220°F) and
differential adjustment (1°F to 30°F).
•
Simple keypad programming of setpoint temperature,
differential and cooling/heating modes.
•
Two individually programmable stages for heating
and/or cooling.
•
LCD readout of sensor temperature, control settings,
relay status and onboard diagnostics.
•
Remote temperature sensing up to 400 feet.
•
Two SPDT output relays.
•
User-selectable Fahrenheit/Celsius scales.
•
Lockout switch to prevent tampering by unauthorized
personnel.
•
Choice of line voltage and low voltage models available.
•
Optional 0 to 10 volt analog output available for remote
temperature indication.
SPECIFICATIONS
Input Voltage 120 or 208/240 VAC (24 VAC optional), 50/60 Hz
Temperature Range -30°F to 220°F
Differential Range 1°F to 30°F
Switch Action SPDT
Sensor Thermistor, 1.94 in. long x 0.25 in. diameter with
8 ft. cable
Power Consumption 120/208/240 VAC : 100 milliamps
24 VAC : 2-6 VAC
I N S T A L L A T I O N I N S T R U C T I O N S
Relay Electrical Ratings
NO Contact
Full-load amps
Locked rotor amps
Resistive amps
Horsepower
NC Contact
Full-load amps
Locked rotor amps
Resistive amps
Horsepower
Pilot Duty: 125 VA at 120/208/240 VAC
Control Ambient Temperature
Operating
Storage
Ambient Humidity
0 to 10 V Output Impedance
Enclosure
Agency Approvals
ETC ORDERING INFORMATION
Input
Code Number Voltage
ETC-211000-000 120/240
ETC-211100-000 120/240
ETC-212000-000
ETC-212100-000
OPERATION
Liquid Crystal Display (LCD)
The LCD display provides a constant readout of the sensor temperature
and indicates if either of the two output relays is energized. When the S1
annunciator is constantly illuminated during operation, the Stage 1 relay is
energized. Likewise, when the S2 annunciator is constantly illuminated
during operation, the Stage 2 relay is energized. The display is also used
in conjunction with the keypad to allow the user to adjust the setpoint
temperatures, differentials and heating/cooling modes for each stage.
Control Setup
The temperature setpoint refers to the temperature at which the normally
open (NO) contacts of the output relay will open. Determine the loads to
be controlled and the operating modes required for each stage, cooling or
heating.
•
When the cooling mode is chosen, the differential is above the setpoint.
The relay will de-energize as the temperature falls to the setpoint.
•
When the heating mode is chosen, the differential is below the setpoint.
The relay will de-energize as the temperature rises to the setpoint.
The ETC two stage control can be set up for two stages of heating, two stages
of cooling or one stage cooling plus one stage heating. Refer to Figures 1, 2
and 3 for a visual representations of different control setups.
Phytotronics Rev A 3/2012
120V 208/240V
9.8 A 4.9 A
58.8 A 29.4 A
9.8 A 4.9 A
1/2 hp 1/2 hp
5.8 A 2.9 A
34.8 A 17.4 A
5.8 A 2.9 A
1/4 hp 1/4 hp
-20°F to 140°F (-29°C to 60°C)
-40°F to 176°F (-40°C to 80°C)
0 to 95%, RH, Non-condensing
1K
NEMA 1, Plastic
UL Listed, File E94419, Guide XAPX
CSA Certified, File LR68340, Class 4813 02
No. of
Stages
2
2
24 2
24 2
0 - 10 V
Output
No
Yes
No
Yes
1.