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INSTALLATION INSTRUCTIONS
subbase, or a factory−approved air conditioning coil casing. DO
NOT cut main furnace casing to attach supply air duct,
humidifier, or other accessories. All supply−side accessories
MUST be connected to duct external to furnace casing.
Return Air Connections
WARNING
!
FIRE HAZARD
A failure to follow this warning could cause personal
injury, death and/or property damage.
Never connect return−air ducts to the back of the
furnace. Follow instructions below.
The return−air duct must be connected to return−air opening
(bottom inlet) as shown in Figure 27. DO NOT cut into casing
sides (left or right). Bypass humidifier connections should be
made at ductwork or coil casing sides exterior to furnace. (See
Figure 27)
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed
in bottom return−air opening. Remove and discard this panel
when bottom return air is used. To remove bottom closure
panel, perform the following:
1.
Tilt or raise furnace and remove four (4) screws holding
bottom plate. (See Figure 19)
2.
Remove bottom plate.
3.
Remove bottom closure panel.
4.
Reinstall bottom plate and screws.
HORIZONTAL INSTALLATION
NOTE:
The furnace must be pitched forward as shown in
Figure 18 for proper condensate drainage.
Figure 22
Duct Flanges
PERFORATED
DISCHARGE DUCT
FLANGE
440 01 4001 05
FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
Do not install the furnace on its back or hang furnace with
control compartment facing downward. Safety control
operation will be adversely affected. Never connect
return−air ducts to the back of the furnace.
MINOR PROPERTY HAZARD
Failure to follow this caution may result in minor
property damage.
Local codes may require a drain pan under entire
furnace and condensate trap when a condensing
furnace is used in an attic application or over a finished
ceiling.
The furnace can be installed horizontally in an attic or
crawlspace on either the left−hand (LH) or right−hand (RH)
side. The furnace can be hung from floor joists, rafters or
trusses or installed on a non−combustible platform, blocks,
bricks or pad.
Suspended Furnace Support
The furnace may be supported under the entire length of the
furnace with threaded rod and angle iron. (See Figure 25)
Secure angle iron to bottom of furnace as shown.
Platform Furnace Support
Construct working platform at location where all required
furnace clearances are met. (See Table 1 and Figure 26) For
furnaces with 1−in. (25 mm) clearance requirement on side, set
furnace on non−combustible blocks, bricks or angle iron. For
crawlspace installations, if the furnace is not suspended from
the floor joists, the ground underneath furnace must be level
and the furnace set on blocks or bricks.
UPFLOW
90°
YES
YES
120°
MIN
NO
Specifications subject to change without notice.
Gas Furnace: (F/G)9MVT, (F/G)9MXT, (F/G)9MXE
WARNING
!
CAUTION
!
DOWNFLOW
YES
YES
120°
MIN
NO
HORIZONTAL
90°
YES
YES
120°
MIN
NO
A10493
21
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