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508336-01 4/2023
Temperature Thermistor Sensors
Units are equipped with four factory-installed thermistors
(RT46 - RT49) located on different points on the
refrigerant circuit.
The thermistors provide the Unit Controller with constant
temperature readings of four specific locations on the
refrigeration circuit. These temperatures are used as
feedback in certain modes of unit operation. In addition,
the Unit Controller uses these temperatures to initiate
alarms such as loss of outdoor or indoor coil airflow and
loss of charge.
Each thermistor must be specifically placed for proper
unit operation and to initiate valid alarms. See figure 19
for indoor coil location and figure 20 for outdoor coil
location.
THERMISTOR LOCATION
INDOOR COIL
(RT46, RT47)
FIGURE 19
BLUE
RT47
YELLOW
RT46
RT46 / RT47
Note - 156H units
do not use bypass
assemblies
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