36 ALR 110F – 150F Product Manual ALR2-3
Case 5, Pit/Solid Wall Installation
Pit installations have historically caused many 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 for safety considerations. The grating material must
provide abundant open area or serious recirculation problems will occur. It would be prudent to have
any pit installation reviewed by McQuay application engineers prior to installation.
Figure 21, Pit Installation
Figure 22, Adjustment Factor
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