Midea MCCDH30A-TA3SL, Техническое и сервисное руководство

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Air-cooled modular chiller unit
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1 0 .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 temperature. Check ambient temperature.
Over low air discharge
pressure (Cooling
operation).
Surrounding temperature 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 temperature 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 and outlet
water, adjust the water flow.
Low temperature 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 temperature difference at 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 temperature in chilling water inlet. Check water temperature.
Excessive high air suction pressure. See “Excessive high air suction pressure”.
Over low air discharge
pressure (Heating
operation).
Over low temperature of chilling water. Check chilling water temperature.
Refrigerant leakage or insufficient refrigerant
volume.
Test leakage or charge sufficient refrigerant to the
system.
Excessive low air suction pressure. See “Excessive low air suction pressure”.
Over high air suction
pressure (Heating
operation).
Over heat air in the side of air heat exchanger. Check ambient temperature 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 repaired 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 expelling pressure. See “Over high air expelling pressure”.
High pressure switch error.
Upon error have been confirmed, please replace a
new one.
Compressor stops
because of motor
overload.
Over high air expelling pressure and air suction
pressure.
See “Over high air expelling pressure” and “Over high
air suction pressure”.
High voltage or low voltage, signal phase or
phase unbalance.
Confirm voltage not higher or lower than the rated
voltage 10%.
Short circuit comes out from motor or connecting
interface.
Confirm resistors at motor are connected
corresponding to terminals.
Overload assembly error. Replace a new one.