Installation Manual

11/07/2017 2 EI912
Duct Sensor
This unit is equipped with a remote temperature-sensing probe. This is a solid state probe (actually mini-micro
computer chip at the end of the probe), handle with care.
Suggested installation is in the main warm air stream approximately 20 to 24 airflow inches away from the
electric element. Simply drill a ½” hole in the duct, insert probe, and screw in place.
Comment: The sensor tip within the tube should be at the end of the tube or slightly extending beyond
the tube. If this is not the case, very carefully push the cable (do not grab the sensor tip with pliers)
until the sensor tip can effectively sample the warm air.
Coil and tie excess cable. It should be connected to the Red, ST, and COM screw terminals.
WARNING
IF THE BLACK AND RED SENSOR WIRES ARE CROSSED OR INCORRECTLY INSTALLED AT THE
TERMINAL BLOCK AND POWER IS TURNED ON, BURNOUT DAMAGE CAN RESULT WITHIN
THE SENSOR PROBE.
Summer or Cooling Disable
Based on application, it may be ideal to disable this unit during the cooling cycle to prevent adding heat to
the air conditioning operation.
Select one of the following 3 installation techniques or methods:
A. Extend HP reversing valve wire to the designated “RV” tab. If the heat pump logic is “logic
high” for heating, cut the W1/W2 resistor on the control board with a side cutter. The location
of this resistor is shown below. Review your heat pump’s installation manual to make certain
of your heat pump’s reversing valve logic.
B. Add a manual (summer) disable toggle switch between “R” and “RV” tab.
C. Simply turn off 110V breaker during the cooling season.
Method B or C should be used for boost heater applications.
The location of the W1/W2 resistor is circled above.