Haier AW09TE1VHA, Service Manual

Page: 11 / 79

OUTDOOR UNIT CONTROL S and COMPONENTS PAGE 11
ENGLISH
Discharge Temperature Sensor
Defrost Temperature Sensor
Outdoor Ambient Temperature Sensor
Suction Line Temperature Sensor
The Discharge Temperature Sensor is a negative coefficient
thermistor that senses the temperature of the compressor
hot gas. The Main Control Board 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 Defrost Temperature Sensor is a negative coefficient
thermistor that will change resistance in response to outdoor
coil temperature changes. The Main Control Board monitors
the temperature of the outdoor coil to determine when a
defrost cycle is necessary.The sensor alsomonitors outdoor
coil temperature during defrost cycles todetermine termination
conditions.
This sensor connects to the Main Control Board at PLUG CN-
20.
The Outdoor Ambient Temperature Sensor is a negative
coefficient thermistor that will change resistance in response
to outdoor air temperature changes. The Main Control Board
monitors the temperature of the outdoor air to determine
outdoor fan speed requirements and compressor 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.
The Suction Line Temperature Sensor is a negative
coefficient thermistor that senses the temperature of
the suction line. The Main Control Board monitors the
temperature of the suction line to determine EEV orifice size
in an attempt to maintain proper operating superheat.
This sensor connects to the Main Control Board at PLUG CN-
18.