32 ● gForce Ultra User Manual 10-2014
4. INSTALLATION OF REMOTE OUTDOOR HEAT EXCHANGER
Air cooled condenser and fluid coolers have individual User Manuals which should be
referred to for more complete details.
5. CHARGING
NOTE:
Improper charging procedure could cause compressor damage in
several ways: excessive LP/HP pressure differences, liquid slugging or
vacuum operation. The below system refrigerant charge procedure is
strongly recommended to reduce these risks.
5.1 General Charging Guidelines
Check the unit nameplate for refrigerant type to be used
Refrigerant charging requires unit operation
Calculate the amount of charge for the system
Always use a scale to weigh in as much of the system charge as possible
before starting the unit, record system charge when completed
The refrigerant must be charged at the liquid side of the refrigeration circuit
Care must be taken to prevent charging the system with too much refrigerant
It is recommended to charge the unit with the return air setpoint between
75°F and 85°F (24 and 29°C)
The return air temperature to the unit being charged must be stable and
must be maintained greater than 65°F (18°C)
If this is not possible due to lack of heat load, then load banks must be used
to offset the cooling load during startup
5.2 Voltage Phase Check
5.2.1 Evaporator
Prior to charging, the correct voltage phasing should be checked on the indoor
evaporator. EC plug fans are not dependent on the input power phasing and will
always operate in the proper direction.
Since the scroll compressors are phase dependent, the easiest way to check proper
phasing is to check the rotation of the constant speed scroll compressor (if available) on
the evaporator section of dual circuit units by momentarily energizing the COOL 2
(constant speed compressor) switch on the Manual Override Module located next to the
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