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Electronic Temperature Control Settings & Specifications
Description
The Ranco electronic temperature control (ETC) is
designed to provide on/off control for heating and
cooling. It 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 set point temperature,
differential and heating/cooling mode of operation.
Programming steps and Display
The ETC can be programmed in four simple steps using
the LCD display and three keys on the face of the control.
STEP 1
To start programming press the
SET
key once to
access the Fahrenheit/Celsius mode. The Display
will show the current status, either F for degrees
Fahrenheit or C for degrees Celsius. Then press
either the up or down arrow key to toggle
between the F or C designation.
STEP 2
Press the
SET
key again to access the set point.
The LCD will display the current setpoint and
the
S1
indicator will be blinking on and off to
indicate that the control is in the set point mode.
Then press either the up key to increase or the
down key to decrease the setpoint to the desired
temperature.
STEP 3
Press the
SET
key again to access the differential.
The LCD will display the current differential and
the
DIF1
indicator will be blinking on and off
to indicate that the control is in the differential
mode. Then press the up key to increase or the
down key to decrease the differential to the
desired setting.
STEP 4
Press the
SET
key again to access the cooling or
heating mode. The LCD will display the current
mode, either
C1
for cooling or
H1
for heating.
Then press either the up or down key to toggle
between the
C1
or
H1
designation.
(This setting
must remain at H1 for proper furnace operation
and temperature regulation.)
Press the
SET
key
once more and programming is complete.
NOTE:
The ETC will automatically end programming if no
keys are pressed for thirty seconds. Any settings that have
been changed on the control will be stored at that point.
Step Indicator
Description
1
F or C
Fahrenheit or Celsius Scale
2
S1 blinking
Setpoint Temperature
3
DIF1 blinking
Differential Temperature
4
C1/H1
Cooling or Heating Mode
Troubleshooting Error Messages
Display Message
E1
Appears when either the up or down 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
Appears if the control settings are not properly
stored in memory.
To correct: Re-set all settings. If the display continues
to show E2, replace the control.
EP
Appears when the probe is open, shorted, or sensing
a temperature that is out of range
To correct:
Check to see if the sensed temperature is
out of range. If not, check for probe damage by com
paring it to a known ambient temperature between
–30°F and 220°F. Replace the control if necessary.
EE
Appears if the EEPROM data has been corrupted.
To correct:
This condition can not be field repaired.
Replace the control.
CL
Appears if calibration mode has been entered.
To correct:
Remove power to the control for at least
five seconds. Reapply power. If the CL message still
appears, replace the control
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°
Sensor:
Thermistor, 1.94 in. Long x .025in.
Dia. with 8 ft. cable
Power Consumption: 120/208/240 VAC: 100 Milliamps
24 VAC: 2-6 VA
Summary of Contents for C-150
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