Gree FB01 - Troubleshooting; Error Lists and Troubleshooting Measures

D Series Modular Air-cooled Scroll Chillers
38
8 Troubleshooting
8.1 Error Lists and Troubleshooting Measures
Error Possible Causes Troubleshooting Measures
Too high
discharge
pressure
•
There is air or other incondensable gas
inside the system
•
Fins of the condenser are dirty or
clogged
•
The air ow for condensing is insufcient
or the fan of the condenser runs
improperly
•
The suction pressure is too high
•
Refrigerant is charged too much
•
Ambient temperature is too high
•
Expel incondensable air and vacuum the
system if necessary
•
Clean ns
•
Repair the fan of the condenser
•
See “Too high suction pressure”
•
Let part of refrigerant out
Too low
discharge
pressure
•
The suction pressure is too low
•
Refrigerant leaks or is charged
insufciently
•
See “Too low suction pressure”
•
Take leakage test and add refrigerant
Too high
suction
pressure
•
The discharge pressure is too high
•
Refrigerant is charged exceedingly
•
Liquid refrigerant ows from the
evaporator to the compressosr
•
The entering chilled water temperature is
higher than the allowable value
•
See “Too high discharge pressure”
•
Let the exceedance of refrigerant out
•
Check and regulate the expansion valve
and be sure the temperature sensor of the
expansion valve is attached with the suction
line closely and tightly insulated
Too low
suction
pressure
•
The ambient temperature is too low
•
The check valve or the drier-lter is
clogged
•
The expansion valve works improperly
•
Refrigerant is insufcient
•
The entering chilled water is lower than
the setpoint
•
The chilled water ow is insufcient
•
Replace the check valve or the drier-lter
•
Regulate the expansion valve properly or
take a leakage test to the expansion valve
•
Take a leakage test and add refrigerant
•
Check the intallaiton
•
Check the entering/leaving water pressure
and regulate the water owrate
High
pressure
protection
•
The ambient temperature is too high
•
The air ow for condensing is insufcient
or the fan of the condenser malfunctions
•
The high-pressure swtichs malfunctions
•
Refrigerant is charged exceedingly
•
Repair the fan of the condenser
•
Check the high pressure switch
•
Check the refrigeration charge and let the
exceedance out
Overload
protection
•
The voltage is too high or too low
•
The discharge pressrue is too high or too
low
•
The backwater temperature is too high
•
The overloaded elment malfunctions
•
The ambient temperateure is too high
•
The motor and wiring terminal is short-
circuited
•
Check the voltage which is required to
be within the rated value ±20V and the
exceedance of the phase difference to be
within ±30%
•
Check the discharge pressure and gure out
why
•
Check the backwater temperature and gure
out why
•
Check the electric current of the compressor
•
Improve the ventilation
•
Check the corresponding resistance of the
motor and the terminal