Bottom Return Air Inlet/Horizontal Installation; Filter Arrangement; Suspended/Platform Furnace Support; Roll-Out Protection/Bottom Return Air Inlet/Side Return Air Inlet - Payne PG8MAA Installation And Operating Instructions Manual

FURNACE
APPROVED
COIL ASSEMBLY
OR
COIL BOX
COMBUSTIBLE
FLOORING
I
SHEET METAL _
PLENUM
FLOOR
OPENING
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A08556
Fig. 13 - Furnace, Plenum, and Coil Assembly or Coil Box
Installed on a Combustible Floor
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 2 screws holding bottom
filler panel. (See Fig. 9.)
2. Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
HORIZONTAL INSTALLATION
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.
The furnace can be installed horizontally in an attic or crawl
space 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 each end with threaded rod,
angle iron or metal plumber's strap as shown. (See Fig. 15 and
16.) Secure angle iron to bottom of furnace as shown.
Heavy-gauge sheet metal straps (plumber's straps) may be used
to suspend the furnace from each bottom corner. To prevent
screws from pulling out, use 2 #8 x 3/4-in. (19 ram) screws into
the side and 2 #8 x 3/4-in. (19 ram) screws in the bottom of the
furnace casing for each strap. (See Fig. 15 and 16.)
If the screws are attached to ONLY the furnace sides and not the
bottom, the straps must be vertical against the furnace sides and
not pull away from the furnace sides, so that the strap attachment
screws are not in tension (are loaded in shear) for reliable support.
Platform Furnace Support
Construct working platform at location where all required furnace
clearances are met, (See Fig, 2 and 170 For furnaces with 1-in,
(25 ram) clearance requirement on side, set furnace on non-
combustible blocks, bricks or angle iron, For crawl space
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,
Roll- Out Protection
Provide a minimum 17-3/4 in, x 22 in, (451 x 559 ram) piece of
sheet metal for flame roll-out protection in front of burner area
for furnaces closer than 12 inches (305 ram) above the
combustible deck or suspended furnaces closer than 12 inches
(305 ram) to joists, The sheet metal MUST extend underneath the
furnace casing by 1 in, (25 ram) with the door removed,
The bottom closure panel on furnaces of widths 17-1/2 in, (445
ram) and larger may be used for flame roll-out protection when
bottom of furnace is used for return air connection, See Fig, 17
for proper orientation of roll-out shield,
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 2 screws holding bottom
filler panel, (See Fig, 90
2, Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return-air opening. This panel MUST be in place when
side return air inlet(s) is used without a bottom return air inlet.
Not all horizontal furnaces are approved for side return air
connections. (See Fig. 20.)
FILTER ARRANGEMENT
CARBON MONOXIDE AND POISONING HAZARD
Failure to follow this warning could result in personal
iniury, death and/or property damage.
Never operate a furnace without a filter or with filter access
door removed.
There are no provisions for an internal filter rack in these
furnaces.
Refer to the instructions supplied with accessory Media Cabinet
for assembly and installation options.
This furnace requires a field-supplied external filter rack or a
suitable field-supplied substitute, such as the media cabinet. See
Table 17 for accessory list.
Refer to the instructions supplied with external filter rack for
assembly and installation options.
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