SiUS04-924_A Function of Thermistor
26 Function and Control
2. Function of Thermistor
(1) Outdoor Heat
Exchanger
Thermistor
1. The outdoor heat exchanger thermistor is used for controlling target discharge pipe
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.
2. In cooling operation, the outdoor heat exchanger thermistor is used for detecting 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.
3. In cooling operation, the outdoor heat exchanger thermistor is used for high pressure protection.
(2) Discharge
Pipe Thermistor
1. The discharge pipe thermistor is used for controlling the discharge pipe temperature. If the
discharge pipe temperature (used in place of the inner temperature of the compressor) rises
abnormally, the operating frequency becomes lower or the operation halts.
2. The discharge pipe thermistor is used for detecting disconnection of the discharge pipe
thermistor.
(3) Indoor Heat
Exchanger
Thermistor
1. The indoor heat exchanger thermistor is used for controlling target discharge pipe 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.
2. In cooling operation, the indoor heat exchanger thermistor is used for freeze-up protection
control. If the indoor heat exchanger temperature drops abnormally, the operating frequency
owers, and the operation halts.
3. In heating operation, the indoor heat exchanger thermistor is used for detecting 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.
Four way valve
Compressor
(R14710)
(1)
(3)
(2)
Electronic
expansion valve
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