gForce Ultra IOM
55
Pre-Charge Fixed Speed Compressor
1. After the system has been properly evacuated. Calculate the proper charge for each
circuit by following the steps and the data in the tables.
2. Select the model and refrigerant charge for evaporator and condenser in accordance with
the following table.
Table 11 Fixed Speed Compressor Pre-Charge R-410A
Weight of Refrigerant in Evaporator and Condenser for Fixed Speed Compressor
3. Add refrigerant weights based on the model from Table 11 Fixed Speed Compressor Pre-
Charge R-410A then add the required refrigerant from the 5.5 Line Set Charge
Calculations then multiply by 80% (0.80) to get the initial starting charge.
4. Next, connect the refrigerant tank to the refrigerant manifold gauge set on circuit 2 (always
the fixed speed compressor on Ultra units) and make sure the manifold gauge set is
properly purged.
5. Then from a vacuum, add the amount of refrigerant weight per the above calculations by
slowly opening the high side liquid line valve on the refrigerant manifold gauge to feed
liquid refrigerant through the high side.
6. Add the calculated amount of refrigerant. At this point, there will be approximately 70-
80% of the total charge in the system. It is likely that more refrigerant will be required to
complete the charging procedure. Close the valve on the refrigerant manifold gauge set.
7. Close the valve on the refrigerant manifold gauge set.
WARNING: If the system is charged from a vacuum, the preheating of the
compressor is not necessary. But if starting a compressor that has not
been charged from a vacuum, the crankcase heater must be energized
for a minimum of 12 hours to reduce the possibility of liquid slugging on
start-up. Failure to energize the crankcase heater could result in
compressor damage.
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