Midea MC-SU30-RN1L Owners & Installation Manual page 25

7.5 Troubleshooting
Table 7-1
Error
Air or other non-condensing gas still
in the system
Fins in the condenser are dirty or
foreign substance blocking fins.
Over high air
discharge pressure
Insufficient chilling air volume or
(Cooling operation)
condenser fan error
Excessive high air suction pressure
Excessive refrigerant charging volume
Over high ambient temperature
Over cool air in the side of air heat
Over low air exchanger
discharge pressure
Refrigerant leakage or insufficient r
(Cooling operation)
efrigerant volume
Excessive low air suction pressure
Over high air Excessive refrigerant charging volume
suction pressure
Over high temperature in chilling water inlet
(Cooling operation)
Insufficient water flow volume
Over low air
Over low temperature in chilling water
suction pressure
inlet and outlet
(Cooling operation)
Refrigerant leakage or insufficient
refrigerant volume
Incrustant in evaporator
Insufficient water flow
Air or other non-condensing gas still
Over high air
in the system
discharge pressure
(Heating operation)
Incrustant in water side of heat exchanger
Over high temperature in chilling water inlet
Excessive high air suction pressure
Over low temperature of chilling water
Over low air
Refrigerant leakage or insufficient
discharge pressure
refrigerant volume
(Heating operation)
Excessive low air suction pressure
Over heat air in the side of air heat exchanger
Over high air
suction pressure
Excessive refrigerant charging volume
(Heating operation)
Insufficient refrigerant charging volume
Over low air
Insufficient air flow volume
suction pressure
Air loop short-circuit
(Heating operation)
Insufficient frost-removal operation
Compressor stops
Insufficient chilling water flow volume
because of freeze-proof
protection (Cooling
Gas still in water loop
operation)
Thermal resistor error
Compressor stops because Over high air expelling pressure
of Hi-pressure protection
Hi-pressure switch error
Possible reason
Discharge gas from fluorin charging inlet. Re-vacuum the system if
necessary.
Clean condenser fins.
Check and repair the condenser fan, recover the normal operation
See "Excessive high air suction pressure"
Discharge the excessive refrigerant
Check ambient temperature
Check ambient temperature
Test leakage or charge sufficient refrigerant to the system
See "Excessive low air suction pressure"
Discharge the excessive refrigerant
Check thermal insulation layer of water pipe and the specification of this layer
Check temperature difference at water inlet and outlet, and adjust the
water flow volume
Check and installation state
Test leakage or charge sufficient refrigerant to the system
Eliminate incrustant
Check temperature difference at water inlet and outlet, and adjust the
water flow volume
Discharge gas from fluorin charging inlet. Re-vacuum the system if
necessary.
Eliminate incrustant
Check water temperature
See "Excessive high air suction pressure"
Check chilling water temperature
Test leakage or charge sufficient refrigerant to the system
See "Excessive low air suction pressure"
Check ambient temperature around it
Discharge the excessive refrigerant
Charge sufficient refrigerant to the system
Check fan rotating direction
Reason about remove air short-circuit
Error comes out from 4-way valve or thermal resistor. Replace a new one if necessary.
Error comes from pump or flow-type water volume control. Check and
repair or replace a new one.
Discharge air
Upon error have been confirmed, please replace a new one.
See "Over high air expelling pressure"
Upon error have been confirmed, please replace a new one.
Detect and settle measure
I&O manual
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