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INSTALLATION INSTRUCTIONS
NOTE: Bottom closure must be used when leveling legs are
used. It may be necessary to remove and reinstall bottom
closure panel to install leveling legs. To remove bottom closure
panel, see Step 1 in Bottom Return Air Inlet section.
To install leveling legs:
1.
Position furnace on its back. Locate and drill a hole in
each bottom corner of furnace.
2.
For each leg, install nut on bolt and then install bolt with
nut in hole. (Install flat washer if desired.)
3.
Install another nut on other side of furnace base. (Install
flat washer if desired.)
4.
Adjust outside nut to provide desired height, and tighten
inside nut to secure arrangement.
5.
Reinstall bottom closure panel if removed.
DOWNFLOW INSTALLATION
NOTE: The furnace must be pitched as shown in Figure 19 for
proper condensate drainage.
Supply Air Connections
NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when any one of the following two
accessories are used (see specification sheets for list of
approved accessories):
Special Base − NAHA01101SB
•
•
Cased Coil Assembly − EAM4X, END4X, ENW4X
1.
Determine application being installed from Table 5.
2.
Construct hole in floor per Table 5 and Figure 22.
3.
Construct plenum to dimensions specified in Table 5
and Figure 22.
4.
Install as shown in Figure 24. If Coil Assembly Part is
used, install as shown in Figure 25 .
Floor and Plenum Opening
Figure 22
Dimensions
NOTE: It is recommended that the perforated supply−air duct
flanges be completely removed from furnace when installing
the furnace on a factory−supplied cased coil or coil box. To
remove the supply−air duct flange, use wide duct pliers or hand
seamers to bend flange back and forth until it breaks off. Be
careful of sharp edges. (See Figure 23)
440 01 4401 02
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts, and servicing furnaces.
Connect supply−air duct to supply−air outlet on furnace. Bend
flange inward past 90_ with wide duct pliers (See Table 1
Figure 23) The supply−air duct must be connected to ONLY
the furnace supply outlet or air conditioning coil casing (when
used). When installed on combustible material, supply−air duct
must be connected to ONLY the factory−approved accessory
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
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 28. 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 28)
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.
2.
3.
4.
HORIZONTAL INSTALLATION
NOTE:
Figure 19 for proper condensate drainage.
FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in personal
A96283
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.
Specifications subject to change without notice.
Gas Furnace: (F/G)9MVE
CAUTION
!
WARNING
!
Tilt or raise furnace and remove four (4) screws holding
bottom plate. (See Figure 20)
Remove bottom plate.
Remove bottom closure panel.
Reinstall bottom plate and screws.
The furnace must be pitched forward as shown in
WARNING
!
21
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