7
Manufactured Homes
Recreational Vehicles, Park Models
Manufactured Buildings
Modular Homes / Buildings
• Air openings on top of the furnace and in closet doors
or walls must never be restricted. If the furnace is
operated without adequate combustion air, the flame
roll-out switch will open and turn off the gas supply
to the burners.
This safety device is a manually
reset switch
.
DO NOT install jumper wires across
these switches to defeat their function or reset a
switch without identifying and correcting the fault
condition. If a switch must be replaced, use only the
correct sized part specified in the Replacement Parts
List provided online.
CAUTION:
Exhaust fans, clothes dryers, fireplaces and
other appliances that force air from the house
to the outdoors can create a negative pressure
inside the house, resulting in improper furnace
operation or unsafe conditions such as flame roll
out. It is imperative that sufficient air exchange
with the outdoors is provided to prevent
depressurization. Additional information about
how to test for negative pressure problems can
be found in the NFGC.
Direct Vent Installation
The M4 furnace is listed as a Direct Vent (2-pipe) forced
air furnace (type FSP) for use with both natural and
propane (LP) gases. NOTE: Direct vent appliances draw
combustion air from the outdoors and vent combustion
products back outside, isolating the entire system from
the indoor space. It is important to make sure that the
whole system is sealed and clearances to combustibles
are maintained regardless of the installation being in a
confined or unconfined space.
Installation in Confined Spaces
A confined space is an area with volume less than 50
cubic feet per 1,000 Btuh of the combined input rates of
all appliances drawing combustion air from that space.
Furnace closets, small equipment rooms and garages are
confined spaces. Furnaces installed in a confined space
which supply heated air to areas outside the space must
draw return air from outside the space and must have the
return air ducts tightly sealed to the furnace.
The required sizing of these openings is determined by
whether inside or outside air is used to support combustion,
the method by which the air is brought to the space, and
by the total input rate of all appliances in the space. In
all cases, the minimum dimension of any combustion air
opening is 3 inches.
Important Information
• This furnace must be vented in compliance with
the current revision of the National Fuel Gas Code
(ANSI-Z223.1/NFPA54). Instructions for determining
the adequacy of an installation can be found in the
current revision of the NFGC (ANSI Z223.1 / NFPA54).
Consult local codes for special requirements. These
requirements are for US installations as found in
the NFGC.
• Furnace installation using methods other than those
described in the following sections must comply
with the National Fuel Gas Code (NFGC) and all
applicable local codes.
• Requirements in Canada (B149.1) are structured
differently. In Canada, venting shall conform to the
requirements of the current (CAN/CGA B149.1 or .2)
installation codes. Consult local codes for special
requirements.
• Provisions must be made during the installation
of this furnace that provide an adequate supply of
air for combustion. The combustion air from the
outside needs to be clear of chemicals that can
cause corrosion. The inlet pipe should not be placed
near corrosive chemicals such as those listed on
WARNING:
Upon completion of the furnace installation,
carefully inspect the entire flue system both
inside and outside the furnace to assure it is
properly sealed. Leaks in the flue system can
result in serious personal injury or death due
to exposure of flue products, including carbon
monoxide.
WARNING:
This furnace must not be vented with other
appliances, even if that appliance is of the
condensing type. Common venting can result
in severe corrosion of other appliances or their
venting and can allow combustion gases to
escape through such appliances or vents. Do
not vent the furnace to a fireplace chimney or
building chase.
• The M4 series gas furnace has been certified for use
in manufactured homes in the United States to the UL
307B standard and to ANSI Z21.47 CAN/CGA-2.3 in
Canada and the United States. These furnaces may be
installed in:
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