I AWARNING
3- Using heavy gauge perforated steel straps
("plumber's straps') -
Install as shown in figure 12.
Note - Straps must not interfere withplenum or ex-
haust I_ping; cooling coils and supply and return
air plenums must be supported separately.
Horizontal Application
Unit Suspended in Attic or Crawlspace
Using Heavy Gauge Perforated Steel Straps
("Plumber's Straps")
Inches (ram)
Level unit - side to side and end to end.
PLUMBER'S
Use existing blower deck screws to secure
Also use washers, if required,
2-13/16
1-1/2 (38)
SUPPLY
AIR
Atthe unit's top corners, secure each strap to the furnace, positJone_
as shown, using st least two sheetrnetal screws:
maximum screw length - 3/4 in. and minimum screw size - # 10.
1-1/2 {38)
TOP OFUNIT
/
RETURN AIR 112 1/2
OPENING (13) (13)
END VIEW
1-1/2 (3S)
1/2
(13) TOP OFUNIT
112 ;UPPLY AIR
(13) OPENING
END VIEW
FIGURE 12
Use industry-approvedstandards to size and installthe
supplyand rstumair ductsystem.This willresultina quiet
and low-staticsystemthat has uniformair distdbution.
Supply Air Plenum
Furnacesinstalledwithouta coolingcoilrequirethe instaUa-
tionof e removableaccesspanel inthe supplyairduct.The
accesspanelshouldbe largeenoughto permitinspection(ei-
ther by smokeor reflectedlight)of the heat exchangerfor
leaks after installation.The furnace access panelmustal-
waysbe in placewhen thefurnace isoperatingand it must
notallowleeksintothe supplyair ductsystem.
Return Air Plenum
Return air must not be drawn from a room where this
furnace, or any other gas appliance (ie., a water heat-
er), is installed. When return air isdrawn from a room,
a negative pressure is created in the room. If a gas ap-
pliance is operating in a roomwith negative pressure, the
flue productscan be pulled back down the vent pipe and
into the room. This reverse flow of theflue gas may result
in incomplete combustion and the formation of carbon
monoxide gas. This toxic gas might then be distributed
throughout the house by the furnace duct system.
In upfiowapplications,returnair canbe brought in through
the bottomor either side of the furnace. If a furnace with
bottomreturnairisinstalledon a platform,makean airtight
seal between the bottomofthe furnace and the platformto
ensureproper and safe operation. Use fiberglasssealing
stripsbetweenthe plenumand the furnace cabinetto en-
sure a tightseal.If a filter isinstalled,sizethereturnair duct
tofit thefilterframe.
In downfiow applications,usethe followingsteps when instal-
ling rstum air plenum:
1 - Flange bottom edge of plenum with a hemmed edge.
See figure 13.
2 - Use fiberglass sealing strips between plenum endthe
unit cabinet to ensure a tight seal.
Page 11
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