77 PB
R-410A SEALED SYSTEM REPAIR
Sealed System Method of Charging/ Repairs
BURN HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with a torch.
Failure to follow these procedures could
result in moderate or serious injury.
WARNING
FREEZE HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with liquid refrigerant.
Failure to follow these procedures could
result in minor to moderate injury.
CAUTION
The only acceptable method for charging the sealed system is the Weighed in Charge Method. The weighed in
charge method is applicable to all units. It is the preferred method to use, as it is the most accurate.
The weighed in method should always be used whenever a charge is removed from a unit such as for a leak
repair, compressor replacement, or when there is no refrigerant charge left in the unit. To charge by this
method, requires the following steps:
1. Connect your EPA approved gauges to the proper valves with 750 psig rated pressure hoses.
2. Recover Refrigerant in accordance with EPA regulations.
4. Make necessary repairs to system.
NOTE: When brazing, ensure to ow nitrogen to reduce contamination of capillaries and valves.
5. Evacuate system and hold at or below 500 microns.
6. Weigh in refrigerant with the proper quantity of R‑410A refrigerant.
7. Start unit, and verify performance.
8. Remove hoses and ensure valves are tight and sealed to the O‑ring in the valve cap.
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