Precautions; Troubleshooting; Error Lists And Troubleshooting Measures - Gree D Serie Manual Del Usuario

7.12 Precautions

(1) Take periodic maintenance to the unit to guarantee normal operation.
(2) Once refrigerant leaks, shut down the unit immediately and contact the serviceman. No
open fire is allowed in that refrigerant will decompose into toxic gas.
(3) Switch off the main power supply in case of a fire hazard and extinguish it with effective measures.
(4) The working environment shall be far away from the inflammable substance, such as
petroleum and alcoholic etc. to avoid explosion.
(5) The unit is allowed restarted only after any malfunction is eliminated, otherwise refrigerant
or chilled water would leak, in which case, it is imperative to turn off all switches or the main
power supply.
(6) Do not short-circuit the protection device, otherwise it would cause some malfunction.

8 Troubleshooting

8.1 Error Lists and Troubleshooting Measures

Error
a. There is air or other incondensable gas
inside the system
b. Fins of the condenser are dirty or clogged
Too high
c. The air flow for condensing is insufficient or
discharge
the fan of the condenser runs improperly
pressure
d. The suction pressure is too high
e. Refrigerant is charged too much
f. Ambient temperature is too high
Too low
a. The suction pressure is too low
discharge
b. Refrigerant leaks or is charged insufficiently
pressure
a. The discharge pressure is too high
b. Refrigerant is charged exceedingly
Too high
c. Liquid refrigerant flows from the evaporator
suction
to the compressosr
pressure
d. The entering chilled water temperature is
higher than the allowable value
a. The ambient temperature is too low
b. The check valve or the drier-filter is clogged
Too low c. The expansion valve works improperly
suction d. Refrigerant is insufficient
pressure e. The entering chilled water is lower than
the setpoint
f. The chilled water flow is insufficient
a. The ambient temperature is too high
High b. The air flow for condensing is insufficient or
pressure the fan of the condenser malfunctions
protection c. The high-pressure swtichs malfunctions
d. Refrigerant is charged exceedingly
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D Series Modular Air-cooled Scroll Chillers Owner's Manual
Possible Causes
34
Troubleshooting Measures
a. Expel incondensable air and vacuum the
system if necessary
b. Clean fins
c. Repair the fan of the condenser
d. See "Too high suction pressure"
e. Let part of refrigerant out
a. See "Too low suction pressure"
b. Take leakage test and add refrigerant
a. See "Too high discharge pressure"
b. Let the exceedance of refrigerant out
c. 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
a. Replace the check valve or the drier-filter
b. Regulate the expansion valve properly or take
a leakage test to the expansion valve
c. Take a leakage test and add refrigerant
d. Check the intallaiton
e. Check the entering/leaving water pressure and
regulate the water flowrate
a. Repair the fan of the condenser
b. Check the high pressure switch
c. Check the refrigeration charge and let the
exceedance out