Specifications

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Returnairductworkcanbeconnectedtothestandardlter
rack.SeeFigure 9(sidelterremovalshown).Thelter
rackcanbeinstalledforbottomlterremovalorsidelter
removalbylocatingthebrackets.Forsidelterremovalthe
bracketsshouldbelocatedonthebottom,leftside,andtop.
Forbottomlterremovalthebracketsshouldbemountedon
the left side top and right side with the spring clips supporting
thelter.
Donotusesheetmetalscrewsdirectlyintotheunitcabinet
forconnectionofsupplyorreturnairductwork,especially
returnairductworkwhichcanhitthedrainpanortheaircoil.
Figure 9: Standard 1"(25mm) Filter rack/return air duct
collar
Standard 2" (51mm)
Figure 10: Optional 2"(51mm) Filter rack/return air duct
collar
Tool-less Filter Removal
Ventilation Air
Ventilation may require outside air. The temperature of the
ventilationairmustbecontrolledsothatmixtureofoutside
air and return air entering the conditioner does not exceed
conditioner application limits. It is also typical to close off
the ventilation air system during unoccupied periods (night
setback).
Theventilationairsystemisgenerallyaseparatebuilding
subsystemwithdistributionductwork.Simpleintroductionof
theoutsideairintoeachreturnairplenumchamberreason-
ablyclosetotheconditionerairinletisrecommended.Do
not duct outside air directly to the conditioner inlet. Provide
sufcientdistanceforthoroughmixingofoutsideandreturn
air. See "Operating Limits" on page 12.