Atwood AFLD40 Technical Installation Manual - Page 3

Browse online or download pdf Technical Installation Manual for Furnace Atwood AFLD40. Atwood AFLD40 14 pages.

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when such standard is not applicable, the Standard for
Manufactured Home Installations. (Manufactured Home Sites,
Communities and Set-Ups), ANSI A255.1 and/or CAN/CSA-Z240
MH Series M92 Canadian Standard for Mobile Homes."
ANSI A 255.1 and/or CAN/CSA-Z240.6.2 MH Series, Mobile
Homes
Ground National Electrical Code ANSI/NFPA 70 and/or CSA
C22.1, Part 1
Park Trailers ANSI 1195

GENERAL FURNACE INSTALLATIONS

All models can be installed in either a horizontal or vertical
mounting position horizontal installed units have the gas line
positioned on top or rear, vertical installed units have the must
have the vent located at the floor and gas line at right side and
rear.
Always install furnace through an exterior wall.
DO NOT install furnace near tilt-out rooms, slide-outs, doors or
other projection that could obstruct furnace exhaust.
Locate furnace near midpoint of coach for single furnace
applications.
Installation must provide accessibility if any repairs are necessary
to the furnace. Failure to meet this requirement will create
additional labor costs that will be the responsibility of the installer.
DO NOT install vent in areas where projection or door openings
come within 6" of vent opening.
DO NOT install furnace in an area where wires, pipes or other
objects will interfere with installation or operation of furnace.
DO NOT install furnace on material that restricts return air, such
as directly on carpet, or soft material (like vinyl). If you must install
furnace on carpet or soft material, install furnace on cleats, or on
a wood or metal panel extending the full width and depth of
furnace plus minimum clearance to combustibles.
DO NOT use petroleum or citrus type cleaner on plastic parts, as
damage may occur.
CAUTION: Due to the differences in vinyl siding materials this
appliance should not be installed without first consulting with the
manufacturer of siding.
A gas-fired furnace for installation in a residential garage must be
installed so the burner(s) and the ignition source are located not
less than 18 in (457mm) above the floor and the furnace must be
located or protected to avoid physical damage by vehicles.
DO NOT use petroleum or citrus type cleaner on plastic parts, as
damage may occur.

CLEARANCE TO COMBUSTIBLES

Floorboards, walls & similar combustible building materials must be
provided the full length and width of unit. Spacing is based on installed
position when installed horizontally bottom is bottom. When installed
vertically bottom becomes right side.
clearances
Top
Sides
Vertical /
1/2"
1"
Horizontal
Bottom (to
Blower (side
Rear
screw
opening)
heads)
1/2"
0"
36 sq. in.
Spacing of 1/4" to ducting within 3 feet of furnace must be
provided unless UL listed wire bound vinyl ducts are used. All
ducting material used to be rated for continuous use at minimum
of 200°F.
Clearances are specifically for plywood or similar building
materials surrounding the furnace (i.e. Furnace should not be
located under furniture or in a closet space where clothing or
other material could be located).
To install without adding the 36 sq. in. cutout on the blower side
supply the right side of unit (blower side) with 2" clearance full
length of the unit
Furnace efficiency rating is a thermal rating determined under
continuous operating conditions, independent of any installation.
Efficiency rate is given at 76% minimum; actual efficiency rating
may be higher.
Return air is supplied through openings in furnace casing. All
return air passages must be kept clear for furnace to function
properly. Refer to Minimum clearance to floorboards, walls &
similar combustible building material.
The total unobstructed return air opening size(s) must not be less
than specified. Failure to meet minimum return air requirements
nullifies furnace warranty.

REQUIRED DUCTING

All ducts in the table are four-inch ducts except for bottom discharge as
noted. Two-inch ducts cannot be used in place of four inch.
A bottom discharge requires no additional ducting; additional ducts can
be added if required. Vertically installed units can also be bottom
discharge when right side cover panel has been removed additional
duct can be added if required.
FOR OPTIMAL PERFORMANCE: Use the following ducting
recommendations. Top Duct is used only in addition to these
requirements and is not allowed to be used until these requirements
are met. Additional ducting when added will reduce the airflow through
the ducting and improper ducting could cause poor heating and or
cycling on high temperature limit.
Horizontal or Vertical 4" Ducting: when using 4" ducting one duct
from each side must be used. When using side ducts rear duct
openings will give the best performance.
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