Midea MGBT-F180W/DN1

MCAC-ATSM-2014-09 R410a tropical air-cooled scroll chiller unit 60Hz
Troubleshooting 113
Troubles
Possible reasons
Solutions
Compressor stops
because of motor
overload.
Over high air discharging pressure and air suction
pressure.
Clean the heat exchanger.
Check the EXV,capillary, filter.
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.
Compressor stops
because of integrate
temp. sensor or air
discharge temp.
protection.
Over high or over low voltage.
Confirm voltage not higher or lower than the rated
voltage +/-10%.
Over high air discharging pressure or excessive low air
suction pressure.
Adjust refrigerant charge volume.
Clean the heat exchanger.
Check the EXV,capillary, filter.
Component error.
Check the integrated temp. sensor after motor is
cool down.
Compressor stops
because of low pressure
Protection.
Filter of electronic expanding valve is blocked.
Replace a new filter.
Low voltage switch error.
If the switch is defective, please replace a new
one.
Excessive low air suction pressure.
Add the refrigerant.
Clean the heat exchanger.
Check the EXV,capillary, filter.
Abnormal noise gives
out form compressor.
Liquid refrigerant flows into compressor from
evaporator result in liquid slugging.
Adjust refrigerant charge volume.
Aging of compressor.
Replace a new compressor.
Compressor can’t start.
Over current relay trip up, fuse burnt out.
Replace damaged assembly.
Control circuit without power though.
Check the wring of control system.
High voltage or low voltage protection.
Reference to mention in above the parts of air
suction and discharge pressure error.
Coils inside contactor are burnt out.
Replace damaged assembly.
Wrong connection of phase sequence.
Re-connect and adjust the any 2 wires among 3
phases.
Water system error and flow volume controller short
connection.
Check water system.
Error signal delivered from wired controller.
Find out the error type and carry out the
corresponding measure to settle.
Air side heat exchanger
excessive frost.
4-way valve or thermal resistor error.
Check the running state. Replace a new one if
necessary.
Air loop short circuit.
Settle the short circuit of air discharge.
Excessive noise
Fixing screws at panel are loosen.
Fix up all assemblies.