Page 22
LGM/LCM036, 048, 060, 074
Prognostic & Diagnostic Sensors
Units are equipped with four factory-installed thermistors
(RT42, RT44, RT46, and RT48) 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 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 10 for
proper locations.
TABLE 10
THERMISTOR LOCATION
Unit RT42 & RT46 RT44 & RT48
036U, 048U Figure 21
Figure 23
060U, 074U Figure 22
THERMISTOR LOCATION RT42 & 46
036 & 048 THREE-ROW EVAPORATOR COIL
(VIEW FROM FRONT SIDE OF UNIT)
FIGURE 21
RT42
RT46
DISTRIBU
TOR TUBE
CLAMP THERMISTOR
TO BARE COPPER;
NOT THE DISTRIBU
TOR SLEEVE
SUCTION
LINE
TXV BULB
DETAILS NOT TO SCALE
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