Charge Fixed Speed Compressor; Water/Glycol-Cooled System Charging; Table 17 Refrigerant Receiver Charging Chart; Table 18 Discharge Head Pressure - Data Aire DAPA-2.5 Installation, Operation & Maintenance Manual

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.
Model
GHRC
DARC
GHRC
DARC
GHRC
DARC
GHRC
DARC

Charge Fixed Speed Compressor

While charging, if the receiver (head) pressure is below the value shown in the
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.
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
Receivers or Table 20 Packaged Units with
See 5.8.3 Charging the Fixed Speed
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

Table 17 Refrigerant Receiver Charging Chart

Single Circuit
Size (Tons) lbs./circuit (kg/circuit)
011 thru 039
27.3 (12.3)
(3 thru 11)
053 thru 074
59.0 (26.8)
(15 thru 37)
141 thru 215
103.8 (47.1)
(40 thru 61)
264 thru 352
165.7 (75.1)
(75 thru 100)

Table 18 Discharge Head Pressure

Refrigerant
R-410A 380 PSIG (2620 kPa) or higher
R-407C 230 PSIG (1586 kPa) or higher
Receivers.
Compressor for charging the fixed speed compressor except use
lbs./circuit (kg/circuit)
R-410A
Head Pressure
Table 19 Packaged Units without
58
Single Circuit
R-407C
29.2 (13.2)
63.1 (28.6)
110.9 (50.3)
177.1 (80.3)
Table 18 Discharge