54
3. Add refrigerant weights based on the model and refrigerant type from the above Table 2
gForce GF Dual Circuit Units
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: gForce GF models have dual fixed speed compressor circuits. Each
compressor circuit must be charge individually.
4. Next, connect the refrigerant tank to the refrigerant manifold gauge set on circuit 1 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. At this point, there will be approximately 70 to 80% of the total charge in the system. It
is likely that more refrigerant will be required to complete the charging procedure during
compressor operations.
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.
NOTICE: A quick and easy way to run the fans and compressor is by using
the dap4, MENU I – MANUAL CONTROL (Service Level). See the dap4 User
Manual for details.
During manual control, all automatic control is disabled but the system safety
switches will remain functional.
Charging the Fixed Speed Compressor
Charging requires the unit the unit operation. Before turning the system ON to finish charging
the circuit 1 and 2 make sure to check for voltage phasing. For more information on this refer
to section
5.4 Voltage Phase Check
.
WARNING: When working within the electrical enclosure or on any of
the electrical circuits, risk of electric shock must be avoided and can
cause injury or death. Always disconnect all electrical facility power from
the unit before working within.
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