Hitecsa EQPL-B 4360 Manual Del Operador página 87

II.13 TROUBLESHOOTING
1 – THE CIRCULATION PUMP DOES NOT START (IF CONNECTED): water differential pressure switch alarm
Lack of voltage to the pump unit:
No signal from control board:
Pump blocked:
Pump motor malfunction:
Working set-point reached
The water mesh filter (mounted by installed) is dirty:
2 - COMPRESSOR: DOES NOT START
Microprocessor board alarm:
Absence of voltage, isolator switch open:
Circuit breakers tripped due to overload:
No request for cooling with user system set point correct:
Working set point too high in cooling mode:
Defective contactors:
Compressor electric motor failure:
Head of the compressor very hot, internal circuit breaker tripped
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 RUNS INTERMITTENTLY: low pressure switch alarm
Faulty low pressure switch:
Insufficient refrigerant charge:
Refrigerant line filter clogged (appears frosted):
Irregular operation of the expansion valve:
5 – THE COMPRESSOR STOPS: high pressure switch alarm
Faulty high pressure switch:
Insufficient cooling air in coils< (cooling mode):
Excessive ambient temperature:
Presence of air in the water system:
Excessive refrigerant charge:
6 - EXCESSIVE COMPRESSOR NOISE - EXCESSIVE VIBRATIONS
Compressor is pumping liquid, excessive increase in refrigerant fluid in
crankcase.
Mechanical problems in the compressor:
Unit running at the limit of conditions for use:
7 - COMPRESSOR RUNS CONTINUOUSLY
Excessive thermal load.
Working set point too low in cooling mode:
Poor ventilation to the coils (in cooling mode)
Bad water circulation in the plate exchanger:
Presence of air in the chilled water system:
Insufficient refrigerant charge:
Refrigerant line filter clogged (appears frosted):
Control board faulty:
Irregular operation of the expansion valve:
Irregular working of the contactors:
8 - LOW OIL LEVEL
Leak in the refrigerant circuit:
The crankcase resistance is off:
Unit running under irregular conditions compared to the functioning limits:
9 - THE CRANKCASE RESISTANCE DOES NOT WORK (WITH COMPRESSOR OFF)
Lack of electrical power supply:
The crankcase resistance is off:
10 - HIGH DELIVERY PRESSURE IN NOMINAL CONDITIONS
Insufficient cooling air in coils< (cooling mode):
Presence of air in the water system:
Excessive refrigerant charge:
Problem
SECTION II :: INSTALLATION AND MAINTENANCE
RECOMMENDED ACTION
check electrical connections.
check, call in authorised service engineer.
check and clear as necessary.
overhaul or replace pump.
check
clean the filter.
identify alarm and take appropriate action.
close isolator switch.
restore the switches; check the unit at start-up.
check and if necessary wait for cooling request.
check and if necessary readjust set-point.
replace contactor.
check short circuit.
Wait an hour at least for cooling
check voltage, investigate causes.
replace contactor.
replace compressor.
check operation of pressure switch.
1 Detect and eliminate any leaks;
2 restore correct load.
replace filter.
check calibration, adjust superheating, replace if necessary.
check operation of pressure switch.
check fans, check clearances around unit and possible coil
obstructions.
Check unit operation limits.
bleed the water system.
drain the excess.
1 check operation of the expansion valve;
2 check superheating;
3 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 fans, check clearances around unit and possible coil
obstructions.
check and adjust as necessary.
bleed the system.
1 Detect and eliminate any leaks;
2 restore correct load.
replace filter.
replace board and check it.
check calibration, adjust functioning, replace if necessary.
check functioning.
1 check, identify and eliminate any leaks.
2 restore correct load of refrigerant and oil.
check and replace if necessary.
check unit dimensioning.
check connections
check and replace if necessary.
check fans, check clearances around unit and possible coil
obstructions.
bleed the system.
drain the excess.
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