Operating instructions

Case 1, Building or Wall on One Side of One Unit
The existence of a screening wall, or the wall of a building, in close proximity to an air-cooled unit is
common in both rooftop and ground level applications. Hot air recirculation on the coils adjoining the wall
will increase compressor discharge pressure, decreasing capacity and increasing power consumption. Only
the compressor(s) connected to these coils will be affected.
When close to a wall, place chillers on the north or east-side of them. Have prevailing winds blowing
parallel to the unit’s long axis. The worst case is to have wind blowing hot discharge air into the wall.
Figure 5, Unit Adjacent to Wall
H
D
Figure 6, Adjustment Factors
3.0
2.0
1.0
.5
0
ACZ
090-155
AGZ
075-130
6 ft.
(1.8m)
8 ft.
(2.4m)
4.0
3.0
2.0
0
4.5 ft.
(1.4m)
6 ft.
(1.8m)
8 ft.
(2.4m)
4.5 ft.
(1.4m)
ACZ
030-080
AGZ
026-070
4 ft.
(1.2m)
6 ft.
(1.8m)
3.5 ft.
(1.0m)
4 ft.
(1.2m)
6 ft.
(1.8m)
3.5 ft.
(1.0m)
ACZ
090-155
AGZ
075-130
ACZ
030-080
AGZ
026-070
IMM ACZ/AGZ-4 ACZ / AGZ-BM 7