tcaes 230÷4160 thae - Rhoss

II.5.3
TROUBLESHOOTING
SECTION II: INSTALLATION AND MAINTENANCE
Inconvenience
Recommended action
1 - THE PRIMARY CIRCULATION PUMP DOES NOT START (IF CONNECTED): water differential pressure switch alarm
No power to pumping assembly.
Check electrical connections and auxiliary fuses.
No signal from control board.
Check, call an authorised service centre.
Pump jammed.
Check, unblock if necessary.
Pump motor malfunction.
Repair or replace pump.
Pump speed switch malfunction.
Check, replace component.
Working set point reached
Check.
2 - THE COMPRESSOR DOES NOT START
Microprocessor board alarm.
Identify alarm and intervene if necessary.
No power supply, general isolator open.
Close general isolator.
Overload protection triggered.
1 Reset switch.
2 Check unit at start up.
No cooling request (heating function as heat pump) from user with correct
working set point.
Check and if necessary wait for cooling request (heating).
Working set point too high (too low in heat pump function).
Check and if necessary reset calibration set point.
Faulty contactors.
Replace or repair contactors
Compressor electric motor malfunction.
Check for short circuit.
3 - THE COMPRESSOR DOES NOT START AND YOU CAN HEAR A BUZZING NOISE
Incorrect power supply voltage.
Check voltage and correct phase sequence, verify cause.
Compressor contactor malfunction.
Replace contactor.
Mechanical problems in the compressor.
Recondition the compressor.
4 - THE COMPRESSOR STARTS AND STOPS: low pressure switch alarm
Low pressure switch malfunction.
Check pressure switch calibration and operation.
Insufficient coolant charge.
1 Identify and eliminate any leaks;
2 Restore correct charge.
Coolant line filter clogged (appears frosted).
Replace filter.
Expansion valve malfunction
5 - THE COMPRESSOR STOPS: high pressure switch alarm
High pressure switch malfunction.
Insufficient cooling air in the coils (during chiller function).
High ambient temperature.
Insufficient water circulation on the plate exchanger (during heat pump
function).
Air in the water system (during heat pump function).
Excessive coolant charge.
6 - COMPRESSORS TOO NOISY - EXCESSIVE VIBRATIONS
The compressor is pumping liquid, excessive increase of coolant in sump.
Mechanical problems in the compressor.
Unit running in limit conditions.
7 - THE COMPRESSOR RUNS CONTINUOUSLY
Excessive thermal load.
Working set point too low in cooling cycle (too high in heating cycle).
Insufficient coil ventilation (during chiller function).
Insufficient water circulation on plate exchanger (during heat pump function).
Check calibration, adjust overheating, replace if necessary.
Check pressure switch calibration and operation.
1 Check clearances and make sure coils are not obstructed.
2 Check fan function.
Check unit working limits.
Check and adjust if necessary.
Vent the water system.
Discharge excess.
1 Check expansion valve.
2 Check superheating.
3 Adjust superheating, if necessary replace expansion valve.
Recondition the compressor.
Check yields according to stated limits.
Check system sizing, leakage and insulation.
Check calibration and reset.
1 Check clearances and make sure coils are not obstructed.
2 Check fan function.
Check and adjust if necessary.
Air in the water system (during heat pump function).
Insufficient coolant charge.
Coolant line filter clogged (appears frosted).
Control board malfunction.
Expansion valve malfunction.
Contactor malfunction.
8 - HIGH DELIVERY PRESSURE AT RATED CONDITIONS
Insufficient cooling air at the coils (during chiller function).
Insufficient water circulation on the plate exchanger (during heat pump
function).
Air in the water system (during heat pump function).
Excessive coolant charge.
9 - LOW DELIVERY PRESSURE AT RATED CONDITIONS
Insufficient coolant charge.
Air in the water system (during chiller function).
Insufficient water flow rate to the evaporator (during chiller function).
Mechanical problems in the compressor.
Excessive thermal load (during heat pump function).
KFI accessory malfunction (if assembled).
Vent the system.
1 Identify and eliminate any leaks;
2 Restore correct charge.
Replace filter.
Replace board and check.
Check calibration, adjust operation, replace if necessary.
Check.
Check fan function, clearances and make sure there are no obstructions
in the coils.
Check, adjust if necessary.
Vent the system.
Discharge excess.
1 Identify and eliminate any leaks;
2 Restore correct charge.
Vent the system.
Check, adjust if necessary.
Recondition the compressor.
Check system sizing, leakage and insulation.
Check calibration, adjust if necessary.
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