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For installation in a residential garage, the furnace must be
installed so that the burner(s) and the ignition source are
located no less than 18 inches (457 mm) above the floor.
The furnace must be located or protected to avoid physical
damage by vehicles. When a furnace is installed in a public
garage, hangar, or other building that has a hazardous
atmosphere, the furnace must be installed according to
recommended good practice requirements and current
National Fuel Gas Code or CSA B149 standards.
NOTE: Furnace must be adjusted to obtain a temperature
rise (100% percent capacity) within the range(s) specified
on the unit nameplate. Failure to do so may cause erratic
limit operation and may also result in premature heat
exchanger failure.
This furnace must be installed so that its electrical
components are protected from water.
Installed in Combination with a Cooling Coil
When this furnace is used with cooling units, it shall be
installed in parallel with, or on the upstream side of, cooling
units to avoid condensation in the heating compartment.
With a parallel flow arrangement, a damper (or other means
to control the flow of air) must adequately prevent chilled
air from entering the furnace. If the damper is manually
operated, it must be equipped to prevent operation of
either the heating or the cooling unit, unless it is in the full
HEAT or COOL setting. See Figure 3.
Heating Unit Installed Parallell to Air Handler Unit
(open during heating operation only)
(open during cooling operation only)
Heating Unit Installed Upstream of Cooling Unit
Evaporator
Figure 3. Heating Unit Installed Parallel to Air Handler
When installed, this furnace must be electrically grounded
according to local codes. In addition, in the United States,
installation must conform with the current National
Electric Code, ANSI/NFPA No. 70. The National Electric
Code (ANSI/NFPA No. 70) is available from the following
address:
National Fire Protection Association
1 Battery March Park
Quincy, MA 02269
508364-01
Dampers
Gas Unit
Air Handler Unit
Dampers
Gas Unit
Unit
In Canada, all electrical wiring and grounding for the unit
must be installed according to the current regulations of
the Canadian Electrical Code Part I (CSA Standard C22.1)
and/or local codes.
NOTE: This furnace is designed for a minimum continuous
return air temperature of 60°F (16°C) or an intermittent
operation down to 55°F (13°C) dry bulb for cases where a
night setback thermostat is used. Return air temperature
must not exceed 85°F (29°C) dry bulb.
The A98USMV furnace may be installed in alcoves,
closets, attics, basements, garages, crawl spaces and
utility rooms.
This furnace design has not been CSA Certified for
installation in mobile homes, recreational vehicles, or
outdoors.
Use of Furnace as a Construction Heater
Units may be used for heating of buildings or structures
under construction, if the following conditions are met to
ensure proper operation.
DO NOT USE THE UNIT FOR CONSTRUCTION HEAT
UNLESS ALL OF THE FOLLOWING CRITERIA ARE
MET:
a.
Furnace must be in its final location. The vent system
must be permanently installed per these installation
instructions.
b.
Furnace must be installed as a two pipe system
and one hundred percent (100%) outdoor air must
be provided for combustion air requirements during
construction.
c.
A room thermostat must control the furnace. The use
of fixed jumpers that will provide continuous heating is
prohibited.
d.
The input rate and temperature rise must be set per
the furnace rating plate.
e.
Supply and Return air ducts must be provided and
sealed to the furnace. Return air must be terminated
outside of the space where furnace is installed.
f.
Return air temperature range between 60°F (16°C)
and 80°F (27°C) must be maintained.
g.
MERV 11 or greater air filters must be installed in
the system and must be regularly inspected and
maintained (e.g., regular static checks and replaced at
end of life) during construction.
h.
Blower and vestibule access panels must be in place
on the furnace at all times.
i.
The furnace heat exchanger, components, duct
system, and evaporator coils must be thoroughly
cleaned following final construction clean−up.
j.
Air filters must be replaced upon construction
completion.
Issue 2346
Page 5 of 74
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