emmeti EC 0510 Manuel D'installation Et D'utilisation page 48

8 - INSUFFICIENT OIL LEVEL
Leak in the refrigerant circuit:
The crankcase heater is off:
Unit running under irregular conditions compared to the operating limits:
9 - CRANKCASE HEATER DOES NOT WORK (WITH COMPRESSOR OFF)
Lack of electrical power supply:
The crankcase heater is off:
10 - HIGH DELIVERY PRESSURE IN RATED CONDITIONS
Insufficient cooling air flow to the coils (in cooling mode):
Insufficient water circulation in the heat exchanger (in heating or heat
recovery mode):
Presence of air in the water system (in heating or heat recovery mode):
Excessive refrigerant charge:
11 - LOW DELIVERY PRESSURE IN RATED CONDITIONS
Insufficient refrigerant charge.
Presence of air in the water system (in cooling mode):
Insufficient water flow to the evaporator (in cooling mode):
Mechanical problems in the compressor:
Excessive thermal load (in heating or heat recovery mode):
Irregular working of fan speed regulator
(in cooling mode):
12 - HIGH INTAKE PRESSURE IN RATED CONDITIONS
Excessive thermal load (in cooling mode):
High ambient temperature (in heating or heat recovery mode):
Irregular operation of the expansion valve:
Mechanical problems in the compressor:
Irregular working of fan speed regulator
(in heating or heat recovery mode):
13 - LOW INTAKE PRESSURE IN RATED CONDITIONS
Insufficient refrigerant charge:
Heat exchanger damaged (in cooling mode):
Finned coil dirty (in heating or heat recovery mode):
Irregular operation of the expansion valve:
Insufficient ventilation of evaporating coils (in heating or heat recovery
mode):
Presence of air in the water system (in cooling mode):
Insufficient water flow (in cooling mode):
14 - ONE OF THE FANS DOES NOT WORK OR STARTS AND STOPS
Switch or contactor faulty, break in the auxiliary circuit:
Thermal protection activated:
Non-functioning condensation control:
15 - THE UNIT DOES NOT CARRY OUT DEFROSTING (COILS ICED) in winter mode
4-way valve damaged:
Pressure transducer faulty:
SECTION II: INSTALLATION AND MAINTENANCE
1 check, identify and eliminate leak.
2 restore the correct charge of refrigerant and oil.
check and replace if necessary.
check unit dimensioning.
check connections
check and replace if necessary.
check operation of fans, check clearances around unit and possible coil
obstructions.
check and adjust as necessary.
bleed the system.
drain the excess.
1 identify and eliminate any leaks;
2 restore correct charge.
bleed the system.
check water system and adjust as necessary.
overhaul compressor.
check system sizing, leaks and insulation.
check setting and adjust if necessary.
check system sizing, leaks and insulation.
check unit operating limits.
check operation, clean nozzle, adjust superheating, replace if necessary.
overhaul compressor.
check setting and adjust if necessary.
1 restore correct charge.
2 identify and eliminate any leaks;
1 check.
2 replace
1 check.
2 carry out cleaning procedure.
1 check operation.
2 clean the nozzle.
3 adjust superheating.
4 replace expansion valve if necessary.
1 check.
2 check clearances around unit and possible coil obstructions.
bleed the system.
check and adjust if necessary.
check and replace if necessary.
check for short-circuits, replace the motor.
1 check card operation and replace if necessary
2 check pressure transducer
check and replace if necessary.
check and replace if necessary.
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