Function Of Thermistor - Daikin FTXS09HVJU Service Manual

SiUS04-904

2. Function of Thermistor

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 the temperature of the discharge pipe.
Pipe Thermistor
2. The discharge pipe thermistor is used for detecting disconnection of the discharge thermistor.
C Indoor Heat 1. The indoor heat exchanger thermistor is used for controlling target discharge pipe temperature.
Exchanger
Thermistor
2. The indoor heat exchanger thermistor is used for preventing freezing.
3. The indoor heat exchanger thermistor is used for detecting disconnection of the discharge pipe
Function and Control
Four way valve
B
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.
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 the discharge pipe (used in place of the inner temperature of the
compressor) rises abnormally, the operating frequency drops or the operation halts.
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.
During the cooling operation, if the temperature drops abnormally, the operating frequency
lowers, then the operation halts.
thermistor when heating.
When the discharge pipe temperature becomes lower than the indoor heat exchanger
temperature, the discharge pipe thermistor is judged as disconnected.
The indoor heat exchanger thermistor is also used for preventing abnormal high pressure.
Electronic
expansion valve
A
Compressor

Function of Thermistor

C
(R5204)
35