Hitecsa EWMIG 236 Manual De Instalación, Uso Y Mantenimiento página 49

II.12 CHECKLIST
1 - HIGH FLOW PRESSURE
Insufficient cooling air in air side heat exchanger:
The fan does not work:
Excessive refrigerant charge:
2 - LOW FLOW PRESSURE
Insufficient refrigerant charge:
Mechanical problems in the compressor:
3 - HIGH INTAKE PRESSURE
Excessive thermal load:
Irregular operation of the expansion valve:
Mechanical problems in the compressor:
4 - LOW INTAKE PRESSURE
Insufficient refrigerant charge:
Filter partially obstructed (appears frosted):
Irregular operation of the expansion valve:
Presence of air in the water system:
Insufficient water flow rate:
5 – INVERTER ALARM
An inverter alarm is triggered
6 - COMPRESSOR: DOES NOT START
Microprocessor board alarm:
No voltage, switch open:
Overload protection triggered:
No request for cooling with user system set point correct:
Working set point too high:
Defective contactors:
Compressor electric motor failure:
7 - COMPRESSOR: BUZZING CAN BE HEARD
Incorrect power supply voltage:
Compressor contactor stuck:
Mechanical problems in the compressor:
8 - COMPRESSOR: FUNCTIONS INTERMITTENTLY
Faulty low pressure switch:
Insufficient refrigerant charge:
Refrigerant line filter clogged (appears frosted):
Irregular operation of the expansion valve:
9 - COMPRESSOR: YES STOP
Faulty high pressure switch:
Insufficient cooling air in air side heat exchanger:
Excessive ambient temperature:
Excessive refrigerant charge:
10 - COMPRESSOR: FUNCTIONS NOISILY-INTERMITTENTLY
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:
11 - COMPRESSOR: FUNCTIONS CONTINUOUSLY
Excessive thermal load:
Work set point too low in cooling cycle (high in heating cycle):
Insufficient refrigerant charge:
Refrigerant line filter clogged (appears frosted):
Control board faulty:
Irregular operation of the expansion valve:
Compressor contactor stuck:
Poor ventilation of the coils:
12 - FAN: IT DOES NOT START, IT SWITCHES ON AND OFF
Circuit breaker protection activated:
13 - THE CIRCULATION PUMP DOES NOT START
Lack of voltage to the pump unit:
Pump blocked:
Pump motor malfunction:
Remote ON/OFF switch open (OFF position):
14 - CIRCULATION PUMP PI1/PI2 SET UP DOES NOT REGULATE
The water flow rate remains steady
PROBLEM
SECTION II: INSTALLATION AND MAINTENANCE
RECOMMENDED ACTION
check clearances and make sure coil is not obstructed;
check fan operation.
drain the excess.
1 - detect and eliminate any leaks;
2 - restore correct load.
replace compressor.
check system sizing, infiltrations and insulation.
check operation.
replace compressor.
2 - restore correct load.
1 - detect and eliminate any leaks;
replace filter.
check operation.
bleed the water system.
check the pump operation.
Proceed as follows: set the unit to OFF; reset the alarm. Restore the unit to ON.
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 short circuit.
check voltage, investigate causes.
replace contactor.
replace compressor.
check pressure switch calibration and operation.
1 - detect and eliminate any leaks;
2 - restore correct load.
replace filter.
check operation.
check pressure switch calibration and operation.
1 - check clearances and make sure coils are not obstructed;
2- check fan function.
check unit operation limits.
drain the excess.
1 - check operation of the expansion valve;
2 - check overheating;
3 - adjust overheating, replace the expansion valve if required.
replace compressor.
check unit functioning limits.
check system sizing, leaks and insulation.
check calibration and reset.
1 - detect 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.
1- check for short-circuits;
2 -replace the fan.
check electrical connections.
release the pump.
replace the pump.
set to ON position.
Verify that the differential pressure transducer works
Verify that the knob on the circulator is in the 0-10V position
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