Haier MRV III-RC Service Manual page 53

Part name
Sign
Capacity control, meet indoor load request by adjusting
Compressor /
the frequency.
Pressure
HPSi/1 Inverter/ON-OFF high pressure protection control
Switch
In heating, compressor frequency adjustment, abnormal
Pd
pressure protection.
Pressure
Sensor
In cooling, compressor frequency adjustment abnormal
Ps
pressure protection.
1. Refrigerant flow control when heating
2. When one outdoor unit is operating, LEVa1/2 can
LEVa1/2
Electronic
Expansion
Valve
Sub-cooling valve, in cooling, be controlled as the Tliqsc
LEVb
target.
1. Meet balance of high/low pressure when compressor
SV1
2. High/low pressure protection.
Starting auxiliary oil return when the frequency of inverter
Solenoid
SV18i
compressor is high.
Valve
When equalizing oil, SV10 starts up.
SV10
SV9 When equalizing oil among modules, SV9 starts up.
Refrigerant injection to prevent discharge temperature is
SV3i
too high
Refrigerant injection to prevent discharge temperature is
SV31
too high
4WV1 Change over between cooling and heating
4-way valve
When one outdoor unit is operating, 4WV2 can control
4WV2
the heat exchanger working at a half or full condition.
Function
control the heat exchanger works at a half or full
condition.
starts up or stops.
49
Data
Remark
ANB52: 0.1Ω
20°C
AN66: 0.55Ω
4.15Mpa, OFF
NSK-BD042I-224
NSK-BD017I-224
8~16HP: Φ3.0
8-16HP: Φ2.4
AC220V
Open when power is
on, close when power
is off
When the frequency
of inverter
compressor pass
62rps, starts up, stops
when 52rps.
AC220V
AC220V
AC220V
AC220V
AC220V, power on in
heating; power off in
cooling or defrosting
AC220V, always
power on when heat
exchanger works at
a half condition no
matter heating or
cooling.
2A
2A
2A
2A
2A