Platform Furnace Support; Roll- -Out Protection; Bottom Return Air Inlet; Side Return Air Inlet - Payne PG8J Installation Instructions Manual

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 17.) For furnaces with 1- -in.
clearance requirement on side, set furnace on noncombustible
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. piece of sheet metal for
flame roll- -out protection in front of burner area for furnaces
closer than 12 inches above the combustible deck or suspended
furnaces closer than 12 inches to joists. The sheet metal MUST
extend underneath the furnace casing by 1 in. with the door
removed.
The bottom closure panel on furnaces of widths 17- -1/2 in. 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. 9.)
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
WARNING
!
CARBON MONOXIDE AND POISONING HAZARD
Failure to follow this warning could result in personal
injury, 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 Media Cabinet for
assembly and installation options.
A field- -supplied accessory external filter rack is required.
This furnace requires KGAFR030ALL 1 in. external filter rack or
a suitable field- -supplied substitute, such as the media cabinet.
Refer to the instructions supplied with external filter rack for
assembly and installation options.
AIR DUCTS

General Requirements

The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA), Sheet Metal and
Air Conditioning Contractors National Association (SMACNA)
or American Society of Heating, Refrigerating and Air
Conditioning Engineers (ASHRAE) or consult The Air Systems
Design Guidelines reference tables available from your local
distributor. The duct system should be sized to handle the
required system design CFM at the design external static pressure.
The furnace airflow rates are provided in Table 5- -AIR
DELIVERY- -CFM (With Filter).
When a furnace is installed so that the supply ducts carry air
circulated by the furnace to areas outside the space containing the
furnace, the return air shall also be handled by duct(s) sealed to
the furnace casing and terminating outside the space containing
the furnace.
Secure ductwork with proper fasteners for type of ductwork used.
Seal supply- - and return- -duct connections to furnace with code
approved tape or duct sealer.
NOTE: Flexible connections should be used between ductwork
and furnace to prevent transmission of vibration. Ductwork
passing through unconditioned space should be insulated and
sealed to enhance system performance. When air conditioning is
used, a vapor barrier is recommended.
Maintain a 1- -in. clearance from combustible materials to supply
air ductwork for a distance of 36 in. horizontally from the
furnace. See NFPA 90B or local code for further requirements.

Ductwork Acoustical Treatment

NOTE: Metal duct systems that do not have a 90 degree elbow
and 10 ft. of main duct to the first branch take- -off may require
internal acoustical lining. As an alternative, fibrous ductwork may
be used if constructed and installed in accordance with the latest
edition of SMACNA construction standard on fibrous glass
ducts. Both acoustical lining and fibrous ductwork shall comply
with NFPA 90B as tested by UL Standard 181 for Class 1 Rigid
air ducts.

Supply Air Connections

For a furnace not equipped with a cooling coil, the outlet duct
shall be provided with a removable access panel. This opening
shall be accessible when the furnace is installed and shall be of
such a size that the heat exchanger can be viewed for possible
openings using light assistance or a probe can be inserted for
sampling the air stream. The cover attachment shall prevent leaks.
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