MG3P Installation Manual

14
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 MG3 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.
MG3P series gas furnaces are shipped ready for installation
in the upflow position with upflow return air. MG3S 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 an approved
A/C coil box which is listed according to the cabinet size of the
furnace. Refer to the technical sales literature for part numbers.
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 Figure 1 (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 Figure 44 (page 36) 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 pages 12 - 13 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 manufacturer approved duct connector. See Figure 12
(page 15). 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.