118 PB
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 flow nitrogen to reduce contamination of capillaries and valves.
5. Evacuate system. Refer to Method of Triple Evacuation.
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.
Charging the system:
Unscrew Service Valve Caps to expose the inner hexagon head. Use an allen‑head spanner or service wrench with appropriate adapter
to release the refrigerant into the system. If the calculated line set length is over 25 ft, weight in the additional charge with an approved
refrigerant scale as needed.
Additional Refrigerant Charge
• The additional refrigerant precharge quantity should be determined and
charged into the system according to the following procedure.
• Record the additional refrigerant quantity in order to facilitate maintenance and servicing activities. Refrigerant charge
before shipment (W0 (oz.))
W0 is the outdoor unit refrigerant charge before shipment；
Xg is additional refrigerant outdoor unit needed to charge according to piping length during installation.
Model
Max Pipe
Length (L)
Max Height
Difference (H)
Refrigerant
Pre‑ charged
before shipment
Total Refrigerant Pipe Length
0 ft ‑25 ft Longer than 25 ft
24k 164 feet 98 feet 70.5 0 Xg = 0.38oz/ft ×( Total pipe length(ft.) ‑25)
36k 246 feet 98 feet 98.7 0 Xg = 0.38oz/ft ×( Total pipe length(ft.) ‑25)
48k ‑ 60k 246 feet 98 feet 142.9 0 Xg = 0.60oz/ft ×( Total pipe length(ft.) ‑25)
The Outdoor unit is pre‑charge with refrigerant to accommodate a total piping length of 25 feet. Additional refrigerant (R410A) is
required for extending the piping beyond 25 feet.
R-410A REFRIGERANT SYSTEM REPAIR
Refrigerant Charging
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