506887-01 Page 5 of 78Issue 1213
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
damageby vehicles. Whenafurnace isinstalledin apublic
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 CSAB149 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.
Witha parallel flowarrangement,a damper(orother means
tocontrol theflowof air)mustadequately preventchilled air
from entering the furnace. If the damper is manually
operated,it mustbeequipped toprevent operation ofeither
theheating orthecooling unit,unlessit isinthe full HEAT or
COOL setting. See Figure 3.
TheA97USMV furnacemaybe installed inalcoves,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 Construction Heater
Theseunits are notrecommendedfor useasa construction
heaterduring anyphaseof construction. Very low returnair
temperature, harmful vapors and operation of the unit with
clogged or misplaced filters will damage the unit.
Theseunitsmaybeusedforheatingofbuildingsorstructures
under construction, if the following conditions are met:
•Theventsystemmustbepermanentlyinstalledperthese
installationinstructions.
•Aroom thermostat must control the furnace. The use of
fixedjumpers thatwillprovide continuousheatingis not
allowed.
•The return air duct must be provided and sealed to the
furnace.
•Returnair temperaturerangebetween 60°F(16°C)and
80°F (27°C) must be maintained.
•Air filters must be installed in the system and must be
maintained during construction.
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/NFPANo.70. TheNationalElectricCode(ANSI/
NFPA No. 70) is available from the following address:
National Fire ProtectionAssociation
1 Battery March Park
Quincy, MA 02269
NOTE: This furnace is designed for a minimum continuous
return air temperature of 60°F (16°C) or an intermitent
operation down to 55°F (13°C) dry blub for cases where a
night setback thermostat is used. Return air temperature
must not exceed 85°F (29°C)dry bulb.
In Canada, all electrical wiring and grounding for the unit
must be installed according to the current regulations of the
CanadianElectrical CodePartI (CSAStandard C22.1)and/
or local codes.
Do Not set thermostat below 60° F (16° C) in heating
mode. Setting thermostat below 60° F (16° C) reduces
the number of heating cycles. Damage to the unit may
occur that is not covered by the warranty.
CAUTION
Figure 3
Heating Unit Installed Parallel toAir Handler Unit
Heating Unit Installed Upstream of Cooling Unit
