Troubleshooting And After-Sales Service; Troubleshooting Measures - Gree A Series Installation, Start-Up And Maintenance Manual

A Series Inverter Modular Air-cooled Chiller (Heat Pump)
9

Troubleshooting and After-sales Service

9.1

Troubleshooting Measures

Error
Shutdown against high
pressure protection of the
compressor
Shutdown against
overloading of the
compressor motor
Shutdown against low
pressure protection of the
compressor
Possible Causes
1.Uncomplete vacuuming.
2.Too high envivornment
temperature.
3.Condenser fins are dirty
and there are blockages.
4.Inadequate condensing air
flow and the condenser fan
failed.
5.Failed high pressrue
cutoff.
6.Overcharged refrigerant.
1.The voltage is too high or
too low.
2.The discharge pressure is
too high or too low.
3.The return water
temperature is too high.
4.The overloaded element is
faulty.
5.The enviornment
temperature is too high.
6.There is phase loss for the
compressor.
7.The compressor motor is
short-circuited.
1.The electrostatic
expansion valve is faulty.
5.The low pressure cutoff is
faulty.
3.Refrigerant is insufficient.
4.The entering chilled water
temperature is 5.lower than
the rated.
6.The chilled water flow is
too low.
30
Troubleshooting Measures
1.Revacuum the system and
recharge refrigerant.
2.Improve ventilation.
3.Clean condenser fins.
4.Repair the condenser fan.
5.Check the high pressure
switch.
6.Check the refrigerant
charge and discharge some
refrigerant.
1.Check if the voltage is or
no less than 80% and the
phase difference does not
exceed ±30%.
2.Check discharge pressure
and find out causes.
3.Check return water
temperature and find out
causes.
4.Check the compressor
current.
5.Improve ventilaiton.
6.Check the three phase
resistances.
1.Replace the coils or even
the valve body.
2.Check the low pressrue
cutoff.
3.Check and charge
refrigerant.
4.Check if the chilled water is
down-temperature.
5.Adjust the chilled water
flow.