Midea MGBT-F180W/DN1

R410a tropical air-cooled scroll chiller unit 60Hz MCAC-ATSM-2014-09
112 Troubleshooting
2 Troubles and Solutions
Troubles
Possible reasons
Solutions
Over high air discharge
pressure (Cooling
operation).
Air or other non-condensing gas still in the system.
Discharge gas from refrigerant charging inlet.
Re-vacuum the system if necessary.
Fins in the condenser are dirty or foreign substance
blocking fins.
Clean condenser fins.
Insufficient chilling air volume or condenser fan error.
Check and repair the condenser fan, recover the
normal operation.
Excessive high air suction pressure.
See “Excessive high air suction pressure”..
Excessive refrigerant charging volume.
Discharge the excessive refrigerant.
Over high ambient temp.
Check ambient temp.
Over low air discharge
pressure(Cooling
operation).
Surrounding temp. is lower.
Measure the surrounding Temp.
Refrigerant leak or insufficient.
Leak-hunting or recharging.
Low suction pressure.
Refer to the “low suction pressure”
Over high air
suction pressure
(Cooling operation)
Refrigerant over-charged.
Discharge the additional refrigerant.
High temp. of the inlet chilled-water.
Check the heat insulation of water pipeline.
Over low air suction
pressure (Cooling
operation).
Insufficient water flow.
Measure the temp. difference between inlet /outlet
water, adjust the water flow.
Low temp. of inlet chilled-water.
Check installation.
Refrigerant leak or insufficient.
Leak-hunting or recharging.
Scaling in the evaporator.
Descaling.
Over high air discharge
pressure (Heating
operation).
Insufficient water flow.
Check temp. difference between water inlet and
outlet, and adjust the water flow volume.
Air or other non-condensing gas still in the system.
Discharge gas from refrigerant charging inlet.
Re-vacuum the system if necessary.
Scaling in water side of heat exchanger.
Descaling.
Over high temp. in chilling water inlet.
Check water temp.
Over low air discharge
pressure (Heating
operation).
Over low temp. of chilling water.
Check chilling water temp.
Refrigerant leakage or insufficient
refrigerant volume.
Test leakage or charge sufficient refrigerant to the
system.
Excessive low air suction pressure
Add refrigerant.
Check the EXV,capillary, filter or pressure
controller.
Over high air suction
pressure (Heating
operation)
Over heat air in the side of air heat exchanger
Check ambient temp. around it.
Excessive refrigerant charging volume.
Discharge the excessive refrigerant.
Over low air suction
pressure (Heating
operation).
Insufficient refrigerant charging volume.
Charge sufficient refrigerant to the system
Insufficient air flow volume.
Check fan rotating direction
Air loop short circuit.
Reason about remove air short-circuit
Insufficient frost-removal operation.
Error comes out from 4-way valve or thermal
resistor. Replace a new one if necessary.
Compressor stops
because of freeze-proof
protection (Cooling
operation).
Insufficient chilling water flow volume.
Error comes from pump or flow-type water volume
control. Check and repair or replace a new one.
Gas still in water loop.
Discharge air.
Thermal resistor error.
Upon error have been confirmed, please replace a
new one.
Compressor stops
because of high
pressure protection.
Over high air discharging pressure.
Discharge part of refrigerant.
Clean the heat exchanger.
Check the EXV,capillary, filter.
High pressure switch error.
Upon error have been confirmed, please replace a
new one.