Data Aire gForce Ultra - Table 17 Packaged Units Without Receivers; Table 18 Packaged Units with Receivers

gForce Ultra IOM
66
Adjust the refrigerant charge until the sight glass has sparse bubbles. The system should be allowed
to stabilize for 15 to 20 minutes before meaningful measurements can be taken. After the system
stabilize, verification of a few key measurements should be noted.
Table 17 Packaged Units without Receivers
Acceptable parameters range for water/glycol packaged units without receiver, with return air temperature of
65°F (18.3  C) to 85°F (29.4  C) and entering water/glycol temp of 65°F (18.3  C) to 85°F (29.4  C)
Refrigerant
Liquid Line
Pressure PSIG (kPa)
Liquid Line
Temp °F (°C)
Suction Pressure
PSIG (kPa)
Suction Sat.
Temp °F (°C)
Subcooling
Temp °F (°C)
Superheat
Temp °F (°C)
R-410A
290 to 390
(1999 to 2689)
85 to 100
(29.4 to 37.8)
103 to 130
(710 to 896)
or greater
33 to 45
(0.56 to 7.2)
8 to 15
(-13.3 to -9.4)
12 to 18
(-11.1 to -7.8)
Table 18 Packaged Units with Receivers
Acceptable parameters range for water/glycol packaged units with receivers, with return air temperature of 65°F
(18.3  C) to 85°F (29.4  C) and entering water/glycol temp of 65°F (18.3  C) to 85°F (29.4  C)
Refrigerant
Liquid Line
Pressure PSIG (kPa)
Liquid Line
Temp °F (°C)
Suction Pressure
PSIG (kPa)
Suction Sat.
Temp °F (°C)
Subcooling
Temp °F (°C)
Superheat
Temp °F (°C)
R-410A
290 to 390
(1999 to 2689)
85 to 100
(29.4 to 37.8)
103 to 130
(710 to 896)
or greater
33 to 45
(0.56 to 7.2)
0 to 3°
(-17.8 to -16.1)
12 to 18
(-11.1 to -7.8)
Measure the superheat at the compressor suction line at least 6 inches (152 mm) away from the
compressor.
All water/glycol cooled units have a water regulating valve. A head pressure transducer is connected
to a Schrader fitting on the discharge line and water is regulated into the condenser coil (plate fin
condensers are standard).
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
startup. Failure to energize the crankcase heater could result in
compressor damage.
When charging is complete, add the correct amount of oil. See 5.7.10 Additional Oil
After charging, verifying subcooling and oil level, close the valve on the refrigerant manifold gauge set
and close the service valve on the refrigerant tank and disconnect the refrigerant manifold gauge set.
NOTE: Charging to a full liquid line sight glass should never be the sole
means of determining the correct refrigerant charge. Other parameters
such as superheat, suction pressure, head pressure, sub-cooling and
ambient temperature are also important. A system charged to a clear sight
glass is often overcharged.
Stop the compressor by pressing and holding the ESC key to put the unit in OFFbyKEY mode. Then
reset the require return air temperature setpoint.