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935SB: Installation, Start-up, Operating and Service Maintenance Instructions
"
5/ 16
(8mm)
"
1
3
/
4
(44mm)
(8mm)
"
5
/
16
(44mm)
1
(44mm)
Fig. 30 – Leveling Legs
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
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.
CAUTION
!
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.
Horizontal Installation
NOTE: The furnace must be pitched forward for proper condensate
drainage (see
Fig.
31).
WARNING
!
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
(8mm)
"
5/ 16
"
3
1
/
4
(44mm)
(8mm)
"
5/ 16
"
3/ 4
"
1
3/ 4
Fig.
34).
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.
A89014
Fig. 31 – Furnace Pitch Requirements
Platform Furnace Support
Construct working platform at location where all required furnace
clearances are met.
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. Condensate Trap
section for required and recommended clearances for trap installation
(see
Fig.
6,
Fig.
21, and
Suspended Furnace Support
The furnace must be supported under the entire length of the furnace
with threaded rod and angle iron (see
bottom of furnace as shown.
Roll-Out Protection
Provide a minimum 12-in. x 22-in. (305 x 559 mm) piece of sheet metal
for flame roll-out protection in front of burner area for furnaces closer
than 12-in. (305 mm) above the combustible deck or suspended furnaces
closer than 12-in. (305 mm) to joists. The sheet metal MUST extend
underneath the furnace casing by 1-in. (25 mm) with the door removed.
The bottom closure panel on furnaces of widths 17-1/2-in. (445 mm) and
larger may be used for flame roll-out protection when bottom of furnace
is used for return air connection.
19
CAUTION
!
(Table 2
and
Fig.
32) For furnaces with 1-in. (25
Fig.
32).
Fig.
33). Secure angle iron to
A11237
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