Function Of Thermistor - Daikin J Series Service Manual

SiBE041101

2. Function of Thermistor

Cooling Only
Heat Pump
A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge pipe
Exchanger
Thermistor
2. In cooling operation, the outdoor heat exchanger thermistor is used for detecting
3. In cooling operation, the outdoor heat exchanger thermistor is used for high pressure
B Discharge 1. The discharge pipe thermistor is used for controlling discharge pipe temperature. If the
Pipe Thermistor
2. The discharge pipe thermistor is used for detecting disconnection of the discharge pipe
C Indoor Heat 1. The indoor heat exchanger thermistor is used for controlling target discharge pipe
Exchanger
Thermistor
2. In cooling operation, the indoor heat exchanger thermistor is used for freeze-up protection
3. In heating operation, the indoor heat exchanger thermistor is used for detecting
Function and Control
A
B
A
Four way valve
B
temperature. The system sets the 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.
disconnection of the discharge pipe thermistor. When the discharge pipe temperature
becomes lower than the outdoor heat exchanger temperature, the discharge pipe thermistor
is judged as disconnected.
protection.
discharge pipe temperature (used in place of the inner temperature of the compressor) rises
abnormally, the operating frequency becomes lower or the operation halts.
thermistor.
temperature. The system sets the 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.
control. If the indoor heat exchanger temperature drops abnormally, the operating frequency
becomes lower or the operation halts.
disconnection of the discharge pipe thermistor. When the discharge pipe temperature
becomes lower than the indoor heat exchanger temperature, the discharge pipe thermistor
is judged as disconnected.
Electronic
expansion valve
C
Compressor
Electronic
expansion valve
C
Compressor

Function of Thermistor

(R11611)
(R11591)
34