Function Of Thermistor; Heat Pump Model - Daikin CTXU25G2V1B Service Manual

SiBE12-908
2.

Function of Thermistor

2.1

Heat Pump Model

A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge temperature.
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
C Gas Pipe 1. In cooling, the gas pipe thermistors are used for gas pipe isothermal control.
Thermistor
Function and Control
A
Four way valve
B
Compressor
The system sets a target discharge temperature according to the outdoor and indoor heat
exchanger temperature, and controls the electronic expansion valve opening so that the
target discharge temperature can be obtained.
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.
Function of Thermistor
Expansion valve
EV
A
EV
B
C
E
D
(R7042)
25