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Step 2: Since the majority of refrigerant weight is in liquid form in the liquid line,
refrigerant in the hot gas line and suction line is ignored in the charging calculation.
Calculate the total of the liquid line run, then multiply the equivalent feet of line based on
line size by the correct multiplier to get the refrigerant weight needed for the Line-set.
Weight of Refrigerant in Liquid Line (lbs. /ft.)
Liquid Line OD (inches) Multiplier
1/2”
.067
5/8”
.107
3/4”
.160
7/8”
.223
1 1/8”
.380
Note: Charge Weight at 77F (25C).
Example: If the liquid line of an R-410A system is 150ft, then the estimated refrigerant in the
line for 1-1/8” pipe is 150 * 0.38 = 57lbs
Step 3: Select model and refrigerant charge of receiver based on condenser size and circuit
type
Weight of Refrigerant per Standard Liquid Receiver (lbs.)
Receiver Type Condenser Circuit type Lbs. of Refrigerant
GHRC 011-039 Single 29
GHRC 053-074
Single 55
GHRC 025-074
Dual 29
GHRC 083-130
Dual 55
GHRC 141-215
Dual 93
GHRC 264-352
Dual 143
Step 4: Add refrigerant weights from step 1 through 3 together and multiply by .80 to get
the starting charge.
Example: model GUAX-125XX (37.5 + 57 lbs. + 55) *.80 = 119.6 lbs.
2. Next connect the refrigerant tank to the refrigerant manifold gauge set and make sure the
manifold gauge set is properly purged
3. Then from a vacuum, slowly open the high side liquid line valve on the refrigerant
manifold gauge to feed liquid refrigerant through the high side.
4. Add the amount of refrigerant weight per tables, slowly open the high side liquid line valve on
the refrigerant manifold gauge to feed liquid refrigerant through the high side.
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