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.
Minimum Clearances to
Table 1 Combustible Materials for All Units
CLEARANCE
POSITION
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)
13. These furnaces SHALL NOT be installed directly on
carpeting, 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 CoilAssembly orwhen CoilBoxis 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 (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.
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
FRONT
I Freeze Protection and Return Air
Temperature
SUPPLY MAX80°F/27°C
_AIR
32 ° F/0° C MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
MIN 60°F/16°C
J
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
54-2009/ANSI Z223.1-2009 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.
Combustion and Ventilation Air
• US: Section 9.3 ofthe NFPA54/ANSI Z223.1-2009,
Air for Combustion and Ventilation
• CANADA: Part 8 of the CAN/CSA B149.1-2010,
Venting Systems and Air Supply for Appliances
Specificati ..... bject to change without notice. 440 01 4001 02
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