Function Of Thermistor; Heat Pump Model - Daikin G-Series Service Manual

Function of Thermistor

2. Function of Thermistor

2.1

Heat Pump Model

A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge pipe
Exchanger
Thermistor
2. The outdoor heat exchanger thermistor is used for detecting disconnection of the discharge
3. The outdoor heat exchanger thermistor is used for high pressure protection during cooling
B Discharge 1. The discharge pipe thermistor is used for controlling temperature of the discharge pipe.
Pipe Thermistor
2. The discharge pipe thermistor is used for detecting disconnection of the discharge pipe
C Gas Pipe 1. In cooling, the gas pipe thermistors are used for gas pipe isothermal control.
Thermistor
76
A
Four way valve
B
Compressor
temperature.
The system sets a target discharge pipe temperature according to the outdoor and indoor
heat exchanger temperature, and controls the electronic expansion valve opening so that
the target discharge pipe temperature can be obtained.
pipe thermistor when cooling.
When the discharge pipe temperature becomes lower than the outdoor heat exchanger
temperature, the discharge pipe thermistor is judged as disconnected.
operation.
If the temperature of discharge pipe (used in place of the inner temperature of the
compressor) rises abnormally, the operating frequency drops or the operation halts.
thermistor.
The system controls electronic expansion valve opening so that gas pipe temperature in
each room becomes equal.
Expansion valve
EV
A
EV
B
C
Function and Control
SiBE12-933_A
E
D
(R7042)