Troubleshooting, Defect Effect Cause Remedy

TROUBLESHOOTING

DEFECT	EFFECT	CAUSE	REMEDY
GROUP PARTIALLY	Evaporatordose notfrost even	An empty refrigerantsystem	Leakagemust be eliminated by
OR COMPLETELY	though motoFcompressorruns	indicatesa leakage of R134a This	resolderingthe defectivepoint or
OUT OF	continually.	lossis generallyto be lookedfor at	substitutingthe damaged
REFRIGERANT		the soldering pointsconnectingthe	evaporator.
CHARGE		various componentsor in an
		eventualhole inthe evaporator
		made by the user.

EXCESSIVELY

FULL

HUMIDITY IN THE SYSTEM

PRESENCE OF AIR IN THE SYSTEM

This defect is indicated by the	If in the refrigerantsystema quantity	The system mustbe emptiedand
presenced water outside	of R134a is introducedwhich is	subsequentlyrefilled introducingthe
refrigeratornear the motor caused	greater than that indicated,the	correctquantity of R134a.
byformationsof ice on the return	excess gas dosenot terminate its
tube.	expansionin the evaporatorbut
	proceedsinto the return tube.
This defect is indicated by the partial	The refrigerantsystemis humid	The system mustbe emptiedand
frosting of the evaporatorand by	when there is a small percentageof	then refilledafter eliminatingthe
continual defrostingcycles	water present which, notcompletely	humidity.
determined by the interruptionof the	retained bythe dehydratorfilter,
flow of gas on the evaporator.The	enters into circulationwiththe Freon
motorcompressorkeeps running.	and freezes at the capillaryexit in
	the evaporator.
Poorperformanceof the refrigerant	There is air in a refrigeratingsystem	Groupmust be drained and
systemwhich is indicated:on the	when duringthe filling phase	subsequentlyrefilled after carefully
evaporatorwith a slightfrost which	vacuum is not effectedor it is not	creatingvacuum.
dose not freezeand an excessive	adequatelydone.
overheatingof thecondenserand
motor-compressor.

BLOCKED

CAPILLARY

MOTOR- COMPRESSOR SHORT-CIRCUITED OR BLOCKED

Becauseof thelack of circulation Freonin the system,there is no frosting of the evaporator,while a

slight overheatingof the first spiralof the condenseris noted.

The systemdose notwork andthe "clixson" intervenesinterrupting delivery to the motorraompressor.

Eventualimpuritiescontained in the Freonor in the componentsof the refrigerationsystembefore assembly and not retainedby the filter can obstruct the capillary.

In case of short circuit,the breakdownis dueto the electric

winding: if blocked,thereis a mechanicalfailure in the motor-

compressoE

Torestore the systemit must be emptied,substitutethe capillaryor the evaporatorentirely in case the capillaryis coaxialwith respectto the return tube, then refill it.

The motor-compressormustbe replacedand then proceedwith refilling.

MOTOR- COMPRESSOR DOSE NOT COMPRESS

Nofrost forms on the evaporator	In this case there is a mechanical	The motor-comprossormustbe
even if the motor-compressoris	failure in the diaphramvalveswhich:	replacedand then proceedwith
apparentlyrunning regulary.	remainingcontinuallyopen, do not	refilling.
	permitthe pistonto suck and
	compressor the which
	consequenteIydose not circulatein
	the system.

NOISY MOTOR- COMPRESSOR

In case of mechanicalfailure in the motor-compressorthere in an excessivenoisewhenthe system is functioning: in case a suspension spring is unhooked,bangingwill be heardand therewill be especially strong vibrationswhen the system starts up and stops,

The causeof the excessivenoise is normailyto be sought for in a mechanicalbreak down,and only rarely in the unhookingof one of the suspensionsprings.

The motor-comprossormustbe substitutedand then proceedwith the refilling.

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