McQuay ACZ 045A, Installation, Operation And Maintenance Manual

Page: 40 / 104

40 IOMM ACZ/AGZ-1
Refrigerant Charging
Liquid line subcooling at the liquid shut-off valve should be between 15 and 20 degrees F at full load.
If the unit is at steady full load operation and bubbles are visible in the sightglass, then check liquid
subcooling. The charge for lines, outdoor units, and CDE evaporators are shown below. The charge
for DX evaporators is usually small but should be added in.
Table 14, Refrigerant Charge in Lines
Refrigerant Charge lb of R-22
Tubing
Size
(inches)
Suction Line
Per 100 ft. lb (kg)
Liquid Line
Per 100 Ft. @ 100
°°
F
7/8 N/A 24.0 (10.9)
1 1/8 N/A 40.8 (18.5)
1 3/8 N/A 62.2 (28.2)
1 5/8 1.7 (0.77) 88.0 (39.8)
2 1/8 2.9 (1.3) 153.1 (69.3)
2 5/8 4.5 (2.0) N/A
3 1/8 6.4 (2.9) N/A
Table 15, Refrigerant Charge in Outdoor Unit
AGZ-AM
Model
ACZ,
Model
Circuit #1
R-22 Charge
lb (kg)
Circuit #2
R-22 Charge
lb (kg)
030A 15.9 (7.2) 15.9 (7.2)
030AM 035A 15.9 (7.2) 19.1 (8.6)
035AM 040A 19.2 (8.7) 19.2 (8.7)
040AM 045A 21.8 (9.9) 21.8 (9.9)
045AM 050A 22.1 (10.0) 26.8 (12.1)
050AM 055A 26.8 (12.1) 26.8 (12.1)
Table 16, Refrigerant Charge in CDE
CDE Model R-22 Charge lb (kg)
1004-1 1.9 (0.86)
1204-3 2.8 (1.27)