111 PB
R-410A REFRIGERANT SYSTEM REPAIR
General Information
WARNING
RISK OF ELECTRIC SHOCK
Unplug and/or disconnect all electrical power
to the unit before performing inspections,
maintenances or service.
Failure to do so could result in electric shock,
serious injury or death.
Proper refrigerant charge is essential to unit operation. Operating a unit with an improper refrigerant charge will result in
reduced performance (capacity) and/or efciency. Accordingly, the use of proper charging methods during servicing will insure
that the unit is functioning as designed and that its compressor will not be damaged.
Too much refrigerant (overcharge) in the system is just as bad (if not worse) than not enough refrigerant (undercharge). They
both can be the source of certain compressor failures if they remain uncorrected for any period of time. Quite often, other
problems (such as low air ow across evaporator, etc.) are misdiagnosed as refrigerant charge problems.
An overcharged unit will at times return liquid refrigerant (slugging) back to the suction side of the compressor eventually
causing a mechanical failure within the compressor. This mechanical failure can manifest itself as valve failure, bearing failure,
and/or other mechanical failure. The specic type of failure will be inuenced by the amount of liquid being returned, and the
length of time the slugging continues.
Not enough refrigerant (undercharge) on the other hand, will cause the temperature of the suction gas to increase to the point
where it does not provide sufcient cooling for the compressor motor. When this occurs, the motor winding temperature will
increase causing the motor to overheat and possibly cycle open the compressor overload protector. Continued overheating of
the motor windings and/or cycling of the overload will eventually lead to compressor motor or overload failure.
WARNING
Refrigeration system under high pressure
O
service this equipment.
R410A systems operate at higher pressures than
R22 equipment. Appropriate safe service and
handling practices must be used.
Only use gauge sets designed for use with R410A.
Do not use standard R22 gauge sets.
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