Haier AU042FPERA Service Manual page 11

Part name Sign
Compressor
Pressure switch HPS
Electronic
EEV
expansion valve
Solenoid valve SV1
4-way valve 4WV
Pressure sensor
Temp. sensor
Tc1
Tc2
Heater Chi
Function
Capacity control, meet indoor load
request by adjusting frequency and
/
opening and closing fixing frequency
compressor.
High pressure protection
In heating, refrigerant flow control
1. Keep balance of high/low pressure
when compressor starts up and stops
2. High/low pressure protection
Changing over between cooling and
heating
In heating, compressor frequency
Pd adjustment, abnormal pressure
protection
In cooling, compressor frequency
Ps adjustment, abnormal pressure
protection
Td Detect the top temp. of compressor
Ts Detect the top suction of compressor
Detect ambient temp., set primary fan
Ta
speed and control defrost condition
Detect the temp. of before and after
the supercooling valve to control the
supercooling valve open angle.
Detect frost condition of outdoor heat
Te
exchanger
Used to heat oil in inverter compressor 28W, 220V, one
4.15Mpa, OFF
Φ3.0
AC220V
Open when power is on,
close when power is off.
AC220V electrified in
heating; powered off in
cooling or defrosting.
R(80°C)=50K
B(25/80°C)=4450K
R(80°C)=10K
B(25/80°C)=3700K
9
Date Note
20°C
2A