Unit installation

IOMM ACZ/AGZ-3 ACZ / AGZ-BM 11
Case 5, Pit/Solid Wall Installation
Pit installations can cause operating problems and great care should be exercised if they are to be used on
an installation. Recirculation and restriction can both occur. A solid wall surrounding a unit is
substantially the same as a pit and the data presented here should be used.
Steel grating is sometimes used to cover a pit to prevent accidental falls or trips into the pit. The grating
material and installation design must be strong enough to prevent such accidents, yet provide abundant
open area or serious recirculation problems will occur. Have any pit installation reviewed by McQuay
application engineers prior to installation for air-flow characteristics. The installation design engineer
must approve the work to avoid an unreasonable risk of accident and is responsible for final design
criteria.
Figure 13, Pit Installation
Figure 14, Adjustment Factor
AGZ 075-130
ACZ 090-155
AGZ 026-070
ACZ 030-080
D=6
(1.8)
D=8
(2.4)
D=4
(1.4)
D=5
(2.0)
D=6
(1.8)
D=8
(2.4)
D=4
(1.4)
D=5
(2.0)
D=10
(3.1)
D=7
(2.1)
AGZ
075-130
ACZ
090-155
AGZ
026-070
ACZ
030-080
D=10
(3.1)
D=7
(2.1)
AGZ 075-130
ACZ 090-155
AGZ 026-070
ACZ 030-080
AGZ
075-130
ACZ
090-155
AGZ
026-070
ACZ
030-080