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the duct system. Care must be taken to maintain the proper
maximum pressure rise across the furnace, temperature
rise and flow rate. This may mean increasing the duct size
and/or reducing the blower speed. These treatments must
be constructed and installed in accordance with NFPA and
SMACNA construction standards. Consult with local codes
for special requirements. For best sound performance,
install all the needed gaskets and grommets around
penetrations into the furnace, such as for electrical wiring.
FURNACE INSTALLATION
NOTE: These Installation procedures are suggested for
typical furnace installations. Since each installation is
different, the sequence of instructions may differ from
the actual installation.
ONLY QUALIFIED HVAC TECHNICIANS SHOULD
INSTALL THIS FURNACE.
The installer must be familiar with and comply with all
codes and regulations applicable to the installation of
these heating appliances and related equipment. In
the absence of local codes, the installation must be in
accordance with the current provisions of one or more of
the following standards.
• Federal Manufactured Home Constructions & Safety
Standard (H.U.D. Title 24, Part 3280.707[a][2])
• The Standard for Manufactured Home Installations
(Manufactured Home Sites, Communities, and Set-Ups)
ANSI A225.1 and/or CAN/CSA-2240 MH Series).
• American National Standard (ANSI-119.2/NFPA-501C)
for all recreational vehicle installations.
• American National Standard (ANSI-Z223.1/NFPA-54)
and/or CAN/CGA B149 for all gas-fired furnace models.
• American National Standard (ANSI-C1/NFPA-70) and/or
CSA 22.1 Canadian Electric Code Part 1 for all electrical
field wiring.
About The Furnace
The *M4 Series furnace is designed only for indoor
installations and can be readily connected to the high static
duct system of a home. Units are approved for single/
multistory residential or mobile/modular/manufactured
structures in freestanding/closet/alcove downflow only
configurations.
*RC series gas furnaces are shipped ready for installation
in the upflow position with upflow return air. *RL series gas
furnaces may only be used for downflow operation. See
Figure 1 (page 5)
for the required clearances needed
to move the furnace to its installation point (hallways,
doorways, stairs, etc).
Upflow and downflow models must be installed with
the Nordyne A/C coil box which are listed according to
the cabinet size of the furnace: "B" cabinet - 920169,
"C" cabinet - 920171, and "D" cabinet - 920172.
Approved installation, operation, and maintenance of
this appliance must be in accordance with the listed
specifications contained in these instructions and other
documents supplied with the furnace and/or optional air
conditioning equipment. Unless it is noted differently in this
manual, only use factory authorized kits and accessories on
this appliance. Refer to local authorities having jurisdiction
for further information.
Before You Install this Furnace
√ This equipment is securely packaged at the time of
shipment and upon arrival should be carefully inspected
for damage prior to installing the equipment at the job
site. Claims for damage (apparent or concealed) should
be filed immediately with the carrier.
√ Check the electrical supply and verify the power supply
is adequate for unit operation. The system must be wired
and provided with circuit protection in accordance with
local building codes. If there is any question concerning
the power supply, contact the local power company.
√ Verify the air delivery of the furnace is adequate to
handle the static pressure drop of the coil, filter, and
duct work.
Locating the Furnace
• The dimensions of the room or alcove must be able to
accommodate the overall size of the unit and required
clearances to combustible materials listed in
(page
5). Access for positioning and servicing must
also be considered when locating the unit. To determine
the required clearances needed for installation and
combustible materials, refer to
for cabinet dimensions.
• The furnace must be installed on a solid surface and must
be level front-to-back and side-to-side at installation. The
surface that the furnace is mounted on must provide
sound physical support of the unit.
• The furnace should be installed as close to the center of
the air distribution system as possible and attached to
a properly installed duct system. Do not use the back
of the furnace for return air. See
for circulating air requirements.
• The furnace must be installed so that all electrical
components are protected from water.
• The plenum attached to the A/C coil box and ductwork
within 3 ft. of the furnace must be installed so that
surfaces are at least 1/4" from combustible construction.
• When installed in a residential garage, the furnace must
be positioned so the burners and the source of the
ignition are located no less than 18 inches above the
floor and protected from physical damage by vehicles.
• This furnace is certified for use on wood flooring or
supports, but must not be installed directly on carpeting,
tile, or any combustible material other than wood flooring.
NOTE: The furnace may be installed on combustible
flooring when installed on a Nordyne duct connector. See
Figure 12 (page
16). This factory supplied accessory
must be installed in the floor cavity and attached to the
supply air duct before the downflow furnace is installed.
• The furnace must be installed upstream from a
refrigeration system.
Figure 1
Figure 41 (page 37)
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