Check-List - Hitecsa EWNLM 115 Manuel D'utilisation

II.11 CHECK-LIST
1 - OUTLET PRESSURE HIGH
Insufficient water flow to the rejection device:
Temperature of condenser inlet water too high:
Presence of water in the water circuit of the rejection device:
Insufficient refrigerant load:
2 - OUTLET PRESSURE LOW
Insufficient refrigerant load:
Presence of air in the water system (in chiller operating mode):
Insufficient water flow to the evaporator (in chiller operating mode):
Mechanical problems in the compressor:
Excessive thermal load (in heat pump operating mode):
3 - INLET PRESSURE HIGH
Excessive thermal load:
Irregular operation of the expansion valve:
Mechanical problems in the compressor:
4 - INLET PRESSURE LOW
Insufficient refrigerant load:
Dirty plate exchanger:
Filter partially obstructed (appears frosted):
Irregular operation of the expansion valve:
in the water system:
check circulation pump operation.
5 – COMPRESSOR: DOES NOT START
Microprocessor board alarm:
No voltage, switch open:
Overload protection triggered:
No request for cooling with working set-point correct:
Working set-point too high:
Defective contactors:
Compressor electric motor failure:
6 – COMPRESSOR: MAKES A BUZZING NOISE
Incorrect power supply voltage:
Compressor contactor malfunctioning:
Mechanical problems in the compressor:
7 – COMPRESSOR: STARTS AND STOPS
Faulty low pressure switch:
Insufficient refrigerant load:
Filter partially obstructed (appears frosted):
Irregular working of the expansion valve:
8 – COMPRESSOR: STOPS
Faulty high pressure switch:
Insufficient water flow to the rejection device:
Temperature of rejection device inlet water too high:
Presence of air in the water circuit of the rejection device:
Insufficient refrigerant load:
9 – COMPRESSOR: NOISY AND VIBRATES
Compressor is pumping liquid, excessive refrigerant fluid in crankcase.
Mechanical problems in the compressor:
Unit functioning at the limit of the use conditions envisioned:
10 – COMPRESSOR: RUNS CONTINUOUSLY
Excessive thermal load:
Working set-point too low in cooling cycle (too high in heating cycle).
Bad water circulation in the plate exchanger:
Insufficient refrigerant load:
Filter partially obstructed (appears frosted):
Control board faulty:
Irregular working of the expansion valve:
Compressor contactor malfunctioning:
Poor ventilation of the coils:
11 - CIRCULATION PUMP DOES NOT START
Lack of voltage to the pump unit:
Circulation pump locked:
Circulation pump motor failed:
Remote ON/OFF command open (OFF position):
PROBLEM
bleed the water system. Insufficient water flow:
SECTION II: INSTALLATION AND MAINTENANCE
RECOMMENDED ACTION
check circulation pump operation.
Check operating limits
bleed the water system.
drain excess.
1 - identify and eliminate any leaks;
2 - restore correct load.
bleed the system.
check and adjust if necessary.
replace compressor.
check system sizing, infiltrations and insulation.
check system sizing, infiltrations and insulation.
check operation.
replace compressor.
1 - identify and eliminate any leaks;
2 - restore correct load.
Check, clean the heat-exchanger.
replace filter.
check operation. Presence of air
identify alarm and take appropriate action.
close the switch.
1 - reset the switch;
2 - check the unit at start up.
check and if necessary wait for cooling request.
check and if necessary readjust set-point.
replace contactor.
check for short circuit.
check voltage, investigate causes.
replace contactor.
replace compressor.
check pressure switch calibration and operation.
1 - identify and eliminate any leaks;
2 - restore correct load.
replace filter.
check operation.
check pressure switch calibration and operation.
check operation of circulation pump.
check unit operation limits.
bleed the water system.
drain excess.
1 - check operation of the expansion valve;
2 - check overheating.
3 - adjust overheating or replace expansion valve.
replace compressor.
check unit function limits.
check system sizing, leakage and insulation.
check setting and reset.
check and adjust if necessary.
1 - identify and eliminate any leaks;
2 - restore correct load.
replace filter.
replace the board.
check operation.
replace contactor.
1 - check clearances and make sure coils are not obstructed;
2 - check fan function.
check electrical connections.
release circulation pump.
replace circulation pump.
put in ON position.
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