gForce Ultra IOM
58
After charging, verifying sub-cooling and oil level.
Close the valve on the refrigerant manifold gauge set and close the service valve on the refrigerant
tank and disconnect the refrigerant manifold gauge set.
Repeat the above steps for circuit 2 on a dual compressor unit.
Pre-Charge Variable Speed Compressor
WARNING: The fixed speed compressor (2
nd
stage) must be charged
before charging the variable speed compressor (1
st
stage) in a dual circuit
system.
NOTE: Prior to refrigerant charging, a system vacuum and moisture
removal procedure must have been carried out. Refer to Section 5.1
Charging/Installation Work Procedures and 5.2 Triple Evacuation and
Dehydration Procedure prior to charging the system.
1. After the system has been properly evacuated. Calculate the proper charge by following
the steps.
2. Select the model and refrigerant charge for evaporator and condenser in accordance with
the following table.
Table 13 Variable Speed Compressor Pre-Charge
Weight of Refrigerant in Evaporator plus Condenser for VS Compressors
3. Add refrigerant weights based on the model from the above Table 13 Variable Speed
Compressor Pre-Charge then add the required refrigerant weight from the 5.5 Line Set
Charge Calculations together and multiply by 80% (0.80) to get the initial starting charge.
NOTICE: Some gForce Ultra models have dual compressors (one (1)
variable and one (1) fixed speed) circuits. Each compressor circuit must
be charge individually.
4. Next connect the refrigerant tank to the refrigerant manifold gauge set on circuit 1 (always
the variable speed compressor) and make sure the manifold gauge set is properly purged.
5. 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.
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