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OUTDOOR UNIT CONTROLS AND COMPONENTS
PAGE 11
ENGLISH
The Defrost Temperature Sensor A is a negative coecient
thermistor that will change resistance in response to outdoor
coil temperature changes. The PCB monitors the temperature
of the outdoor coil to determine when the system should
perform a defrost cycle. The sensor also monitors coil
temperature during defrost cycles to determine termination
conditions.
This sensor connects to the Main Control Board at PLUG CN-
31.
The Defrost Temperature Sensor B is a negative coecient
thermistor that will change resistance in response to outdoor
coil temperature changes. The PCB monitors the temperature
of the outdoor coil to determine when the system should
perform a defrost cycle. The sensor also monitors coil
temperature during defrost cycles to determine termination
conditions.
This sensor connects to the Main Control Board at PLUG CN-
20.
The Discharge Temperature Sensor is a negative coecient
thermistor that senses the temperature of the compressor
hot gas. The PCB monitors the temperature of the
compressor hot gas and will make inverter speed changes in
response to input from this device.
This sensor connects to the Main Control Board at PLUG CN-
20.
The Suction Line Temperature Sensor is a negative coecient
thermistor that senses the temperature of the suction line.
The PCB monitors the temperature of the suction line and the
EEV operation to maintain an acceptable superheat.
This sensor connects to the Main Control Board at PLUG CN-
18.
The oil separator is integrated on the exhaust pipe. When
the compressor oil passes through the exhaust pipe, it is
separated by the oil separator, then returns to the air return
pipe through the oil return capillary,and then returns to the
compressor.
The Ambient Temperature Sensor is a negative coecient
thermistor that will change resistance in response to outdoor
air temperature changes. The PCB monitors the temperature
of the outdoor air to determine fan speed requirements and
inverter speed. The sensor also plays a role in calculation of
required defrost conditions.
This sensor connects to the Main Control Board at PLUG CN-
20.
Discharge Temperature Sensor
Defrost Temperature Sensor A
Defrost Temperature Sensor B
Ambient Temperature Sensor
Suction Line Temperature Sensor
Oil Separator
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