SERVICING
38
WARNING
Damage can occur to the glass embedded terminals if
the leads are not properly removed. This can result in
terminal and hot oil discharging.
WARNING
Disconnect ALL power before servicing.
S-26 TESTING TEMPERATURE SENSORS AND EEV COIL
RESISTANCE
The AVZC ComfortNet ready heat pump models and AVPEC indoor
units are factory equipped with:
• (Ta) an outdoor air temperature sensor
• (Tm) an outdoor coil temperature sensor
• (TI) an outdoor liquid temperature sensor
• (Td) a discharge temperature sensor
• (Tb) a defrost temperature sensor
• (Ts) a suction temperature sensor
• (Tgi) an indoor gas temperature sensor
• (Tli) an indoor liquid temperature sensor
To check above sensors:
1. Disconnect power to the heat pump condensor.
2. Disconnect the sensor from the electric board.
3. Connect an ohmmeter across the sensor terminals. The ohm-
meter should read be the resistance shown in the table THER-
MISTOR RESISTANCE AND TEMPERATURE CHARACTERISTICS. Re-
place the sensor if the sensor is open, shorted, or outside the
valid resistance range.
Testing EEV coil resistance
To check the resistance of the EEV coil, first disconnect EEV cable
from the PCB board. Make measurements of resistance between
the connector pins, and then make sure the resistance falls in the
range of 40 to 50
Ʊ
.
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