Clearance To Combustibles; Required Ducting; Required Discharge - Dometic hydro flame AFM Série Mode D'emploi


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.

NOTE: The exhaust temperature of this furnace could discolor or
warp some materials. You should verify that the material used on
coach door, panel, or covers will not discolor, warp or burn from
the exhaust temperature whenever placed directly in front of vent.

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.

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" 1/2"
Horizontal

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 unit (blower side) with 2" clearance full length of the
unit.
Bottom (to Blower (side
Rear
screw heads) opening)
1/2" 0"
36 sq. in.

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; one additional duct
can be added if required. Vertically installed units can also be bottom
discharge when right side cover panel has been removed one
additional duct can be added if required.
FOR OPTIMAL PERFORMANCE use the following instructions for
ducting. (Two top ducts are only to be used in addition to the below
installations and are not allowed to be used until these requirements
have been met). Additional ducting added will reduce the air flow and
could cause poor heating.
 Horizontal or Vertical 4" Ducting: when using 4" ducting one
duct from each side must be used. When using side ducts,
utilizing rear duct openings as the other duct will yield the best
performance.
 Horizontal Bottom Discharge: This installation is for horizontally
installed units and can be used with the addition of one duct any
location except the top two.
 Vertical Bottom Discharge: Installation of the furnace in a
vertical mounting position can be used with the addition of one
duct any location except the casing top two ducts.

REQUIRED DISCHARGE

Models
AFM (16)(20)
AFM (25)(30)(35)
Horizontal Bottom
Vertical Bottom
System
AFMD16
4" Ducts
2
Horizontal
4 x 10
Bottom
Vertical
5 x 9-3/4
Bottom
*Note the table is for minimum requirements and should in most
cases allow the unit to operate correctly. If the burner cycles on
and off on the high temperature limit. Extra ducting can be used
to help correct this condition due to restriction or bends in duct
work.
3
Required Discharge Area
2
24 in
2
36 in
2
48 in
2
48 in
AFMD25
AFMD20 AFMD30
AFMD35
2 3
4 x 10 4 x 10
5 x 9-3/4 5 x 9-3/4