MINIMUM CLEARANCE TO
FLOORBOARDS, WALLS & SIMILAR COMBUSTIBLE BUILDING MATERIALS*
MUST BE PROVIDED THE FULL LENGTH AND WIDTH OF UNIT
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
should be rated for continuous use at 200˚F.
: Clearances are specifically for plywood or similar building materi-
als surrounding furnace (i.e. furnace should
furniture or in a closet space where clothing or other material
could be located.)
: Efficiency rating is a thermal rating determined under continuous
operating conditions, independent of any installation. Efficiency
rate is given at 77% minimum, actual efficiency rating may be
CARBON MONOXIDE POISONING
Furnace must be installed and vented to these instructions.
Improper installation, adjustment, alteration, service or mainte-
nance can cause injury or property damage.
Improper installation location may cause furnace to produce neg-
ative pressure, affecting combustion air or venting of other appli-
CRITICAL INSTALLATION WARNINGS
install furnace on material that restricts return air, like carpet
or any soft material such as vinyl.
install furnace where clearance to combustibles cannot be
modify furnace in any way.
alter furnace for a positive grounding system.
HI-POT furnace unless electronic ignition system (circuit
board) has been disconnected.
use battery charger to supply power to DC model furnace
even when testing.
use 120 volt AC current with DC models.
use furnace cabinet area as a storage compartment.
vent furnace with venting system serving another appliance.
vent furnace to an outside enclosed porch area.
use for temporary heating of buildings or structures under
• Protect building materials from degrading from flue gas exhaust.
• Protect furnace electrical components from water.
FOLLOW ALL APPLICABLE STATE AND LOCAL CODES
IN THE ABSENCE OF LOCAL CODES OR REGULATIONS
Recreation Vehicles ANSI A119.2/NFPA 501C.
National Fuel Gas Code ANSI Z223.1 and/or CAN/CGA B149
Federal Mobile Home Construction & Safety Standard, Title 24 CFR,
part 3280, or when this 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, Mobile Homes.
Ground - National Electrical Code ANSI/NFPA No. 70 and/or CSA C22.1
Park Trailers ANSI 119.5
be located under
USA AND CANADA
REFER TO CURRENT STANDARDS OF
: The direct high voltage spark ignition generates a radio frequency
that could cause interference with other microprocessor based
equipment. Locate equipment at least five feet (5') from furnace
location. If this distance cannot be maintained, purchase MPD
37773 (a shielded high voltage lead).
CARBON MONOXIDE POISONING
Properly seal vent assembly to prevent carbon monoxide from
air into the living area or an enclosed porch.
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
. The total unobstructed return air opening size(s) must
than specified in
minimum return air requirements nullifies furnace warranty.
STANDARD FURNACE INSTALLATION
General Installation -
• Install furnace through an exterior wall.
install furnace near tilt-out rooms, slide-outs, doors or
other projections that could obstruct furnace exhaust.
• Locate furnace near midpoint of coach for single furnace applica-
• 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.
install vent in areas where projections or door openings
come within 6˝ of vent tube opening.
install furnace in an area where wires, pipes, or other
objects will interfere with the installation or operation of furnace.
directly 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 fur-
nace on cleats, or on a wood or metal panel extending the full
width and depth of furnace plus minimum clearances to com-
• DO NOT use petroleum or citrus type cleaners on plastic parts, as
damage may occur.
• The furnace must always be installed level (front to back, side to
side) to prevent water intrusion into the interior.
WALL CUTOUT OPTIONS
RECOMMENDED WALL THICKNESS
Do not oversize hole - oversizing can result in water leakage.
EXTERIOR WALL CUTOUT
HORIZONTAL & VERTICAL
HORIZONTAL & VERTICAL INSTALLATION
1. Locate vent hole cutout as called out in (
2. Drill 3-1/2˝ diameter hole through side wall of coach.
3. Remove vent and vent ring from furnace.
combustion air from living area.
WALLS & SIMILAR COMBUSTIBLE BUILDING
MINIMUM RETURN AIR
0˝ to 2-1/2˝
. Failure to meet