SiBE121135_A Function of Thermistor
Function and Control 110
3. Function of Thermistor
The Illustrations are for the 4-room models as representative and have 4 lines of indoor unit
system (A ~ D). The 3-room models have 3 lines (A ~ C) and the 5-room models have 5 lines
(A ~ E).
Cooling Only Model
Heat Pump Model
(1) Outdoor Heat
Exchanger
Thermistor
1. The outdoor heat exchanger thermistor is used for controlling the target discharge pipe
temperature. The system sets the target discharge pipe temperature according to the
outdoor and indoor heat exchanger temperature, and controls the outdoor 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 the
disconnection of the discharge pipe thermistor. When the discharge pipe temperature drops
below the outdoor heat exchanger temperature by more than a certain value, the discharge
pipe thermistor is judged as disconnected.
3. In cooling operation, the outdoor heat exchanger thermistor is used for high pressure
protection.
EVC
EVD
EVB
EVA
Compressor
(1)
(2)
(3)
(4)
(R17248)
DCBA
Outdoor electronic
expansion valve
Four way valve
Compressor
EVC
EVD
EVB
EVA
(1)
(2)
(3)
(4)
(5)
(R17159)
DCB
Radiant panel
A: In case of FVXG model
Indoor electronic
expansion valve
(Motor operated
valve)
(4)
(6)
φ
6
(6)
φ
4
Outdoor electronic
expansion valve
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