Install Instructions

INSTALLATION DATA
ETC TWO 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 readout
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 mulple compressor
control, two stage heang, venlaon
control, automac changeover, condenser
fan cycling, space and return air tempera-
ture control, water cooled condensers and
control with alarm funcon.
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
• Two individually programmable stages for heang and/or cooling
• 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
• 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
• 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, 1.94 in. long x 0.25 in. diameter
with 8 . cable, IP67 rated
Power Consumpon 120/208/240V AC: 100 milliamps
24V AC: 2-6V AC
1
Relay Electrical Rangs
NO Contact 120V 208/240V
Full-load amps 9.8 Amps 4.9 Amps
Locked rotor amps 58.8 Amps 29.4 Amps
Resisve amps 9.8 Amps 4.9 Amps
Horsepower 1/2 HP 1/2 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 120/208/240 VAC
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 1 K
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-211000-000 ETC-211020-000 120/240 2 No
ETC-211100-000 ETC-211120-000 120/240 2 Yes
ETC-212000-000 ETC-212020-000 24 2 No
ETC-212100-000 ETC-212120-000 24 2 Yes
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 operaon, the Stage 1
relay is energized. Likewise, when the S2 annunciator is constantly
illuminated during operaon, the Stage 2 relay is energized. The display
is also used with the keypad to allow the user to adjust the setpoint
temperatures, dierenals and heang/cooling modes for each stage.
Backlight
When any mode key is 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 loads to be controlled and the operang modes required for each
stage, cooling or heang.
• 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.
The ETC two stage control can be set up for two stages of heang, two
stages of cooling or one stage cooling plus one stage heang. Refer to
Figures 1, 2 and 3 for a visual representaons of dierent control setups.