Data Aire DAPA-05 - 5.8.12 Charge Fixed Speed Compressor; 5.8.13 Water;Glycol-Cooled System Charging

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Use two (2) lbs. per nominal ton and using a “liquid charging adapter” 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. At this point the receiver(s) are
pre-charged.
Table 17 Refrigerant Receiver Charging Chart
Model
Size (Tons)
Single Circuit
lbs./circuit (kg/circuit)
R-410A
Single Circuit
lbs./circuit (kg/circuit)
R-407C
GHRC
DARC
011 thru 039
(3 thru 11)
27.3 (12.3)
29.2 (13.2)
GHRC
DARC
053 thru 074
(15 thru 37)
59.0 (26.8)
63.1 (28.6)
GHRC
DARC
141 thru 215
(40 thru 61)
103.8 (47.1)
110.9 (50.3)
GHRC
DARC
264 thru 352
(75 thru 100)
165.7 (75.1)
177.1 (80.3)
Charge Fixed Speed Compressor
While charging, if the receiver (head) pressure is below the value shown in the Table 18 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 18 Discharge Head Pressure
Refrigerant
Head Pressure
R-410A
380 PSIG (2620 kPa) or higher
R-407C
230 PSIG (1586 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 19 Packaged Units without
Receivers or Table 20 Packaged Units with Receivers.
See 5.8.3 Charging the Fixed 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