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After Charging and verifying Subcooling and oil level, close the valve on the refrigerant manifold gauge
set, switch “Cool 2” and “Blower” slide switches to the OFF position on manual bypass board, and close
the service valve on the refrigerant tank and disconnect the refrigerant manifold gauge set.
5.4.2 Variable Capacity Compressor
NOTE: Prior to refrigerant charging, a system vacuum and moisture removal
procedure must have been carried out. Refer to Section 5.2 for evacuation
procedures prior to charging the system.
See the tables for the appropriate charging
1. After the system has been properly evacuated. Calculate the proper charge by following the
steps of the tables below.
Add the amount of refrigerant needed for the evaporator & condenser + the line-set then
multiply by .80.
Step 1: Select the model and refrigerant charge for evaporator and condenser.
Weight of Refrigerant in Evap + Condenser
Model Starting Charge (lbs.)
GUAX-022XX
15
GUAX-036XX
25
GUAX-045XX
32.5
GUAX-070XX
25
GUAX-091XX
32.5
GUAX-125XX
37.5
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 calculated at 77F (25C).
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