Midea RSJ-120/ZN1-540V1 User Manual

Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906
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Table 3-4.3: Phenomena need to contact Midea service agency
Phenomena
Possible reason
Detect and settle measure
Compressor is unable to drive
1. Power errors.
Connected with wrong phase sequence.
2. Wire connection is loosening.
Check and fasten again.
3. Relay or fuse errors.
Check and repair.
4. Compressor errors.
Change the compressor.
Fan has loud noise
1. Fixing screw of the fan is loosening.
Re-fasten the fixing screw of the fan.
2. Fan blade touched the cover shell or screen
Check and adjust.
3. The fan operated unsteadily.
Change the fan.
Abnormal noise given out from
compressor
1. Liquid refrigerant flows into compressor and
produces liquid strikes.
Check the EXV, and whether the
temperature sensor loosen and repair.
2. Damages of the compressor inner
components.
Replace the compressor.
Water pump not operated or
abnormal operated
1. Power errors.
Check and repair.
2. Relay error.
Replace the relay.
3. There is gas in the water pipe.
Drain off the gas.
Compressor ON and OFF
frequently
1. Bad circulation of water system.
Blocked the water system or has air in
the water system. Check the water
pump, valves, pipeline, and clean the
water filter or drain off the air.
2. Low load.
Adjust the load or add stored energy
device.
Compressor operated with no
heating
1. Refrigerant leakage.
Check, repair and replenish the
refrigerant.
2. Compressor error.
Change the compressor.
No obvious heating effect of the
unit
1. Bad thermal insulation of water system.
Enlarge the thermal insulation of the
system.
2. Bad heat exchanging of evaporator.
Check the air inlet and outlet whether
are normal and clean the evaporator.
3. Lack of refrigerant.
Check whether has refrigerant leakage.
4. The water side heat exchanger has blocked.
Clean or change the heat exchanger.
Midea CAC Confidential

Midea RSJ-120/ZN1-540V1 Specifications

General

Brand	Midea
Model	RSJ-120/ZN1-540V1
Category	Heat Pump
Language	English