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3 –THE COMPRESSOR DOES NOT START BUT YOU CAN HEAR A BUZZING NOISE
Incorrect power supply voltage:
Defective contactors
Mechanical problems in the compressor
4 - THE COMPRESSOR WORKS INTERMITTENTLY: low pressure pressure-switch alarm
Faulty low pressure transducer
Insufficient amount of refrigerant fluid
Clogged refrigerant fluid line filter (appears frosted)
Irregular operation of the expansion valve
5 - THE COMPRESSOR STOPS: high pressure pressure-switch alarm
Faulty high pressure switch
Not enough cooling air in coils (in cooling mode)
Not enough water circulation on the plate heat exchanger (in heating
mode)
High ambient temperature
Presence of air in the water system
Excessive amount of refrigerant fluid
6 - Excessive compressor noise - Excessive vibrations
The compressor is pumping liquid, excessive refrigerant fluid in crankcase
Mechanical problems in the compressor
Unit running at the limit of the specified condition of use
7 - Compressor runs continuously
Excessive thermal load
Work set-point too low in cooling mode
Work set-point too high in heating mode
Poor ventilation in the coils
Poor water circulation in the plate exchanger
Presence of air in the chilled water system
Insufficient amount of refrigerant fluid
Clogged refrigerant fluid line filter (appears frosted)
Faulty control board
Irregular operation of the expansion valve
Irregular contactor operation
8 - LOW OIL LEVEL
Refrigerant fluid leakage
Unit running under irregular conditions compared to the functioning limits
9 - THE CRANKCASE HEATER DOES NOT WORK
No electrical supply
The crankcase heater is off
10 - OUTLET PRESSURE HIGH IN NOMINAL CONDITIONS
Not enough cooling air in coils (in cooling mode)
Not enough water circulation on the plate heat exchanger (in heating
mode)
Presence of air in the water system
Excessive amount of refrigerant
Dirty or blocked batteries (in cooling mode):
H5xxxxx
80
check voltage, investigate causes
replace the contactor
replace the compressor
check operation of pressure switch
1. detect and eliminate any leaks
2. top-up to the correct amount
replace the filter
check calibration, adjust overheating, replace if necessary
check operation of pressure switch
check fans, check clearances around unit and possible coil obstructions.
check and adjust as necessary.
check unit operation limits.
bleed the water system
drain the excess
1. check operation of the expansion valve
2. replace expansion valve if necessary
overhaul compressor
check performance according to declared limits
check system sizing, leakage and insulation of rooms served
check calibration and reset.
check calibration and reset.
check fans, check clearances around unit and possible coil obstructions.
check and adjust as necessary.
bleed the system
1. detect and eliminate any leaks
2. top-up to the correct amount
replace the filter
replace the board and verify
check calibration, adjust operation, replace if necessary
check operation
1. check, identify and eliminate any leaks
2. top-up to the correct amount of refrigerant and oil
check unit sizing
check connections
check and replace if necessary
check fan operation, check technical spaces and possible coil obstructions
check and adjust as necessary.
bleed the system
drain the excess
check and clean and/or remove any obstructions
EasyPACK ECO - Nias
80
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