Heating Load; Clearances To Combustible Materials; Combustion Air Requirements; General Information - Nordyne M4RC Upflow Installation Instructions Manual

This Gas-fi red furnace may be installed in a residential
garage with the provision that the burners and igniter
are located no less than 18 inches (457mm) above the
fl oor. The furnace must be located or protected to prevent
physical damage by vehicles.

Heating Load

This furnace should be sized to provide the design heating
load requirement. Heating load estimates can be made
using approved methods available from Air Conditioning
Contractors of America (Manual J); American Society of
Heating, Refrigerating, and Air Conditioning Engineers;
or other approved engineering methods. Excessive
oversizing of the furnace could cause the furnace
and/or vent to fail prematurely. In addition, the ductwork
should be appropriately sized to the capacity of the
furnace to ensure its proper airfl ow rating. For installations
above 2,000 ft., the furnace should have a sea level input
rating large enough that it will meet the heating load after
deration for altitude.

Clearances to Combustible Materials

This furnace is Design Certifi ed in the U.S. and Canada
by CSA International for the minimum clearances to
combustible material listed in Table 1 (page 9). To obtain
model number and specifi c clearance information, refer
to the furnace rating plate, located inside of the furnace
cabinet.
Access for positioning and servicing the unit must be
considered when locating unit. The need to provide
clearance for access to panels or doors may require
clearance distances over and above the requirements.
Allow 30 inches minimum clearance from the front
of the unit for servicing and positioning. However, 36
inches is strongly recommended.

COMBUSTION AIR REQUIREMENTS

General Information

Provisions must be made during the installation of
this furnace that provide an adequate supply of air for
combustion. NORDYNE condensing furnaces must be
installed with outdoor combustion air piped directly to
the furnace.
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.
• 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.
6
WARNING:
• Requirements in Canada (B149.1) are structured
differently. Consult with B149.1 and local code offi cials
for Canadian installations.
• The M4 series gas furnace has been certifi ed 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:
Manufactured Homes
Recreational Vehicles, Park Models
Manufactured Buildings
Modular Homes / Buildings
• 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 confi ned or unconfi ned space.
• 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 page 5. These chemicals can cause
severe corrosion in the furnace combustion system.
• 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 fl ame
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 specifi ed in the Replacement Parts
List provided online.
CAUTION:
Exhaust fans, clothes dryers, fi replaces 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 fl ame roll
out. It is imperative that suffi cient 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.
Installation in Confi ned Spaces
A confi ned 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.