INSTALLATION INSTRUCTIONS
Gas Furnace: (F/G)9MVT, (F/G)9MXT, (F/G)9MXE
4
440 01 4001 05
Specifications subject to change without notice.
accessory gas conversion kit is required to convert
furnace for use with propane gas.
11. See
Table 1
for required clearances to combustible
construction.
12. Maintain a 1
−
in. (25 mm) clearance from combustible
materials to supply air ductwork for a distance of 36
−
in.
(914 mm) horizontally from the furnace. See NFPA 90B
or local code for further requirements.
Table 1
Minimum Clearances to
Combustible Materials for All Units
POSITION
CLEARANCE
In(mm)
REAR
0
FRONT (Combustion air openings in
furnace and in structure)
1 (25)
Required for service
*
24 (610)
All Sides of Supply Plenum
*
1 (25)
Sides
0
Vent
0
Top of Furnace
1 (25)
* Consult local building codes
13. These furnaces SHALL NOT be installed directly on
carpeting, combustible tile, or any other combustible
material other than wood flooring. In downflow
installations, factory accessory floor base MUST be
used when installed on combustible materials and wood
flooring. Special base is not required when this furnace
is installed on manufacturer’s Coil Assembly or when
Coil Box is used. See
Table 1
for clearance to
combustible construction information.
Introduction
The 4
−
way multipoise Category IV condensing furnace is CSA
design
−
certified as a direct vent (2
−
pipe) or non
−
direct vent
(1
−
pipe) furnace. (See
Figure 3
) The furnace is
factory
−
shipped for use with natural gas. The furnace can be
converted in the field for use with propane gas when a
factory
−
supplied conversion kit is used. Refer to the furnace
rating plate for conversion kit information.
These furnaces are not approved for installation in recreational
vehicles or outdoors. Single-stage furnaces (40k through
120k) are approved for installation in manufactured
housing/mobile homes with manufacturer approved accessory.
Single Stage furnace is approved for installation in a mobile
home when a factory
−
supplied accessory mobile home
conversion kit is used. The conversion kit is required for use
with both natural and propane gas. The furnace must also be
installed on a factory
−
supplied accessory combustible floor
base or evaporator coil casing.
This furnace is designed for minimum continuous return
−
air
temperature of 60
°
F (15
°
C) db or intermittent operation down to
55
°
F (15
°
C) db such as when used with a night setback
thermostat. Return
−
air temperature must not exceed 80
°
F
(27
°
C) db. Failure to follow these return
−
air temperature limits
may affect reliability of heat exchangers, motors, and controls
(See
Figure 1
)
The furnace should be sized to provide 100 percent of the
design heating load requirement plus any margin that occurs
because of furnace model size capacity increments. 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.
For accessory installation details, refer to the applicable
instruction literature.
NOTE:
Remove all shipping materials, parts assemblies and
literature before operating the furnace.
Figure 1
Freeze Protection and Return Air
Temperature
32
°
F/0
°
C MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
SUPPLY AIR
MAX 80
°
F/27
°
C
MIN 60
°
F/16
°
C
A10490
Codes and Standards
Follow all national and local codes and standards in
addition to these instructions.
The installation must comply
with regulations of the serving gas supplier, local building,
heating, plumbing, and other codes. In absence of local codes,
the installation must comply with the national codes listed
below and all authorities having jurisdiction.
In the United States and Canada, follow all codes and
standards for the following:
Safety
US: National Fuel Gas Code (NFGC) NFPA
54
−
2012/ANSI Z223.1
−
2012 and the Installation
Standards, Warm Air Heating and Air Conditioning
Systems ANSI/NFPA 90B
A manufactured (Mobile) home installation must
conform with the Manufactured Home Construction
and Safety Standard, Title 24 CFR, Part 3280, or
when this standard is not applicable, the Standard for
Manufactured Home Installation (Manufactured Home
Sites, Communities, and Set-Ups),ANSI/NCS A225.1,
and/or CAN/CSA-Z240, MH Series Mobile Homes
CANADA: National Standard of Canada, Natural Gas
and Propane Installation Code (NSCNGPIC)
CAN/CSA B149.1
−
2010
General Installation
US: NFGC and the NFPA 90B. For copies, contact the
National Fire Protection Association Inc.,
Batterymarch Park, Quincy, MA 02269; or for only the
NFGC contact the American Gas Association, 400 N.
Capitol, N.W., Washington DC 20001.
CANADA: NSCNGPIC. For a copy, contact Standard
Sales, CSA International, 178 Rexdale Boulevard,
Etobicoke (Toronto), Ontario, M9W 1R3, Canada.
