Data Aire gForce Ultra, Installation, Operation & Maintenance Manual

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gForce Ultra IOM
65
Use approximately
2 lbs. per nominal ton and using a “liquid charging adapter” to add the calculated
system charge at the condenser through the liquid line and discharge line with liquid refrigerant. A
“liquid charging adapter” is needed so liquid refrigerant doesn’t enter the compressor.
Table 15 Refrigerant Receiver Charging Chart
Model Size kW (Tons)
Dual Circuit
lbs./circuit (kg/circuit)
GHRC
DARC
011 thru 039
(3 thru 11)
27.3 (12.3)
GHRC
DARC
053 thru 074
(15 thru 37)
59.0 (26.8)
GHRC
DARC
141 thru 215
(40 thru 61)
103.8 (47.1)
GHRC
DARC
264 thru 352
(75 thru 100)
165.7 (75.1)
At this point the receiver(s) are pre-charged.
While charging, if the receiver (head) pressure is below the value shown in the Table 16 Discharge
Head Pressure below for the refrigerant type used, block part of the condenser coil surface or turn OFF
the fans until the pressure rises to the value shown in the table, while observing the receiver sight glass.
During extremely cold weather, all the condenser fans may need to be deenergized to allow head
pressure to increase.
Once you reach the pressure value shown below, enable the condenser fans and
continue to charge each circuit until it reaches the value shown.
Table 16 Discharge Head Pressure
Refrigerant Head Pressure
R-410A 380 PSIG (2620 kPa) or higher
While charging during the summer, meter refrigerant through the suction line until the level of liquid in
the receiver sight glass is approximately 1/3 from the bottom (the level ball in the receiver will start to
float) of the sight glass. A liquid charging adapter should be used to prevent liquid refrigerant from
entering the compressor. Charge each circuit to the value shown in
Table 17 Packaged Units without
Receivers or Table 18 Packaged Units with Receivers .
See 5.7.4 Charging the Fixed Speed Compressor or 5.7.7 Charging the Variable Speed Compressor
for charging the fixed speed compressor except use the table below for the proper charge conditions.
Water/Glycol-Cooled System Charging
All water/glycol cooled units are factory charged with refrigerant. The superheat at the compressor
suction line at least 6 inches (152 mm) away from the compressor. The water regulating valve should
be adjusted to maintain the required conditions. Field charging, if required, of water/glycol systems
should be
done by referring to the unit’s electrical nameplate. The factory charge is indicated on the
nameplate. Although this figure represents the initial factory charge, it is still necessary to measure and
note proper unit operation including superheat, head and suction pressure. Some adjustment of charge
may be required.