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6SCHEDATECNICA 97017
In case of leakage close to the compressor or a compressor breakedown follow the following procedure:
Disconnectthecompressorusingatubecutter.Dothisascloseaspossibletothecompressor.Oncethecompressor
has been removed, you can do any type of maintenance (extend tube or unweld pieces and so on.
The new compressor, which has not been charged with R290, can be welded into the system as usual.
If you have only to extend the compressor service pipe, you can do this using a LOCKRING CONNECTOR.
In case of leakage close to the compressor or a compressor breakedown follow the following procedure:
Disconnectthecompressorusingatubecutter.Dothisascloseaspossibletothecompressor.Oncethecompressor
has been removed, you can do any type of maintenance (extend tube or unweld pieces and so on.
The new compressor, which has not been charged with R290, can be welded into the system as usual.
If you have only to extend the compressor service pipe, you can do this using a LOCKRING CONNECTOR.
PREPARATIONS FOR THE VACUUM
Onceyouhaveclosedtheleakageandexchangedfaultycomponents,youcanpreparetherefillingunitasshownon
page13 of thismanual.
- Verifythattheservicepipehasasufficientlengthinordertocloseitaftertherefillingprocedure.Keepinmindthat
you have to squeeze it (in case you do not have a "Ball like Pinch Off Tool" you will have to squeeze it twice) and
you have to seal it with a LOCKRING SEAL. If you need to extend the service pipe, you have to do it now.
- Connecttheservicepipemediate acoupler,valve (E)and pressuretubeto the4waymanifoldvalve "C".
- Connectthe vacuum pumptothe manifold valve"A" and thegas bottle tovalve "B".
Important:Thetubebetweengasbottleandmanifoldhastobelongenoughthatitcanrestontothefloorortable
when the gas bottle is positioned onto the balance, otherwise it could greatly vary the measurement.
- Position the balance close to the air conditioner and secure the gas bottle upside down onto it.
PUMPING THE VACUUM AND REFILLING
- Secureyourself, thatall valvesare closed.
- Openvalve"E"oftheservicepipeandthevalves"A,BandC"ofthe4waymanifold.Thisway,thepumpwillproduce
a vacuum in the whole unit, up to the closing valve of the gas bottle.
- Switch on the vacuum pump and let it produce a good vacuum.
- Whenthevacuumhasreachedagoodvalue,closethevalve"A"towardsthevacuumpumpandswitchitoff.Check
that the unit will keep the vacuum.
- Now close the valve "E" at the compressor service pipe.
- Open the valve of the gas bottle "F" and let the liquid gas fill the refilling unit until the closing valve of the service
pipe "E".
- Once the gas has filled the unit, do a last check that everything is at its place, then reset the balance.
After you have reset the balance, you are not allowed to touch or move the gas bottle and filling
tubes, as this would upset the measurment of the balance. The balance has to stay stable before
opening the valve "E" and allowing the gas to fill the air conditioner.
- Openslowlythevalve"E"attheservicepipeandlettheneededgasquantityentertheairconditionerplusadditional
threegramms.(*)
Keep in mind, that the tolerance for the refilling is of five gramms.
Incase thatnotall gasenters intotheairconditioner,close valve"E",startthecompressor andcarefully addthe
gas until the right amount has entered the system.
- Closeallvalves.
- Let the gas in the filling tubes escape into open air and proceed to the closure of the refrigerant system.
In case that the tubes have been moved, the gas bottle has run out of gas or other problems, you will have
to repeat the vacuum and filling process.
(*)Testsinthelaboratory haveresultedinasmalldifferencebetweenthegasquantityindicatedbythebalanceand
whichactuallyenteredintotherefrigeratingsystem.Toimprooftherepairresult,wethereforerecommendtoaddthree
gramms to the gas quantity indicated by the technical notes and rating plate.