4
duct(s) sealed to the furnace casing and terminating outside
the space containing the furnace. See “Air Ducts” section.
8. A gas--fired furnace for installation in a residential garage
must be installed as specified in the warning box in the
“Location” section.
9. The furnace may be used for construction heat provided
that the furnace installation and operation complies with the
first
CAUTION
in the
LOCATION
section of these in-
structions.
10. These Multipoise Gas--Fired Furnaces are CSA design--cer-
tified for use with natural and propane gases (see furnace
rating plate) and for installation in alcoves, attics, base-
ments, closets, utility rooms, crawlspaces, and garages. The
furnace is factory--shipped for use with natural gas. A CSA
(A.G.A. and C.G.A.) listed accessory gas conversion kit is
required to convert furnace for use with propane gas.
11. See Table 2 for required clearances to combustible con-
struction.
12. Maintain a 1--in. (25 mm) clearance from combustible ma-
terials 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.
13. These furnaces SHALL NOT be installed directly on car-
peting, combustible tile, or any other combustible material
other than wood flooring. In downflow installations, fact-
ory 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 manufac-
turer’s Coil Assembly is used. See Table 2 for clearance to
combustible construction information.
Important Installation and Start--up Procedures
Failure to follow this procedure may result in a nuisance
smoke or odor complaint.
The manifold pressure, gas rate by meter clocking,
temperature rise and operation must be checked after
installation.
Minor smoke and odor may be present
temporarily after start--up from the manufacturing process.
Some occupants are more sensitive to this minor smoke and
odor. It is recommended that doors and windows be open
during the first heat cycle.
NOTICE
THE BLOWER IS LOCATED
TO THE RIGHT OF THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED TO THE LEFT.
THE BLOWER IS
LOCATED BELOW THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED UPWARD.
THE BLOWER IS
LOCATED ABOVE THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED DOWNWARD
THE BLOWER IS
LOCATED TO THE LEFT
OF THE BURNER SECTION,
AND CONDITIONED AIR IS
DISCHARGED TO THE RIGHT.
A12181
Fig. 1 -- Multipoise Orientations
INTRODUCTION
The 4--way multipoise Category IV condensing furnace is CSA
design--certified for both
direct--vent (2-pipe) and ventilated
combustion air venting installations. See Fig. 1. 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.
This furnace is not approved for installation in mobile homes,
recreational vehicles, or outdoors.
This furnace is designed for minimum continuous return--air
temperature of 60
_
F (15
_
C) db or intermittent operation down to
55
_
F (13
_
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 Fig. 2.
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. None of the furnace
model sizes can be used if the heating load is 20,000 BTU or
lower. Use Air Conditioning Contractors of America (Manual J
and S); American Society of Heating, Refrigerating, and
Air-Conditioning Engineers; or other approved engineering
method to calculate heating load estimates and select the furnace.
Excessive oversizing of the furnace may cause the furnace and/or
vent to fail prematurely, customer discomfort and/or vent freezing.
Failure to follow these guidelines is considered faulty installation
and/or misapplication of the furnace; and resulting failure,
damage, or repairs may impact warranty coverage.
For accessory installation details, refer to the applicable instruction
literature.
NOTE
: Remove all shipping materials, loose parts bag, and
literature before operating the furnace. See Table 1.
