Prognostic & Diagnostic Sensors - Lennox LGT036 Installation Instructions Manual

Diagnostic Sensors
Units are equipped with two factory-installed thermistors
(RT46 and RT48) located on different points on the
refrigerant circuit.
The thermistors provide the Unit Controller with constant
temperature readings of two 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 condenser or evaporator airflow
and loss of charge.
Each thermistor must be specifically placed for proper
unit operation and to initiate valid alarms. See table 13 for
proper locations.
THERMISTOR LOCATION
Unit
LGT/LCT036, 048, 060, 072
LGT/LCT036, 048, 060, 072
Page 30
TABLE 13
Sensor
Figure
Yellow
RT46
RT48
LGT/LCT036, 048, 060, 072
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