Airwell YEVFD Series, Service Manual

Page: 17 / 92

Part name Sign Function Date Note
Compressor /
Capacity control, meet indoor load
request by adjusting frequency and
opening and closing fixing frequency
compressor.
20°C
Pressure switch
HPS High pressure protection 4.15Mpa, OFF
LPS
In cooling, compressor frequency
adjustment and protection control for
abnormal pressure.
0~1.7MPa
Electronic
expansion valve
EEV
In heating, refrigerant flow control
(subcooling valve)
Φ3.0
Solenoid valve SV1
1. Keep balance of high/low pressure
when compressor starts up and stops
2. High/low pressure protection
AC220V
Open when power is on,
close when power is off.
2A
4-way valve 4WV
Changing over between cooling and
heating
AC220V electrified in
heating; powered off in
cooling or defrosting.
Temp. sensor
Td Detect the top temp. of compressor
R(80°C)=50K
B(25/80°C)=4450K
Ts Detect the top suction of compressor
R(80°C)=10K
B(25/80°C)=3700K
Tao
Detect ambient temp., set primary fan
speed and control defrost condition
Tdef
Detect frost condition of outdoor heat
exchanger
15