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Question DetailsAsked on 9/15/2016

I replaced a new hvac condenser with Freon in it,do I need to add more refrigerant to the ysystem

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I presume you mean refrigerant condensor coil (outdoor cooling coil that the large fan blows air through), not the electrical starter condensor. If you meant the electrical starting condensor (capacitor) then no, you would not have to do anything to the refrigerant, presuming it was in the correct operating range originally.

Assuming you mean the refrigerant condensor coil - or maybe even the evaporator coil (the inside coil in the air handler or ducting), almost certainly at least a little bit of topping off will be needed - depending on whether any had leaked out before the repair, and whether the gas in the system was fully extracted before the condensor was installed and then put back into the system after the repair.

The lineset should have been flushed of air and any shipping nitrogen in the unit before putting the old refrigerant back in, with additional lubricant as needed - which only an EPA certified refrigeration technician is allowed to do, legally.

Only an operating test, checking the high and low side pressures during operation, will tell if there is the proper amount of gas in the system for optimum operation. You do not have to be very far off optimum pressure to really degrade the operating efficiency of the unit, and be far off and you can get serious operating issues and compressor damage because the compressor is substantially cooled by the gas passing through it (which is partly why the hot gas has to be cooled by a condensor coil before it goes to the evaporator coil) and also the lubricating oil circulates with the gas, so low gas amount can damage the compressor by providing inadequate lubrication. Likewise, too high a pressure can result in liquid refrigerant making it to the compressor and cause "slugging" - the compressor trying to compress a liquid or partial liquid, which can rapidly damage a compressor (normal cause of a "thumping" compressor).

And note that the added R-22 (Freon) has to have the correct type of lubricant in it (if shipped with lubricating oil, as is sometimes done), because there are several different types in use with R-22 systems and get them mixed and you can really gum up the works or plug off the filter/drier. Or the lubricant needs to be fully flushed, then new lubricant of the correct type added back with the recharge - another reason only certified AC technicians are allowed by law to charge AC systems.

Answered 3 years ago by LCD

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