J952V Installation Manual

5
• Exposure to the following substances in the combustion
air supply may require outdoor air for combustion:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine based swimming pool chemicals
Water softening chemicals
De-icing salts or chemicals
Carbon Tetrachloride
Halogen type refrigerants
Cleaning solvents (perchloroethylene)
Printing inks, paint removers, varnishes, etc.
Hydrochloric Acid
Cements and glues
Antistatic fabric softeners
Masonry acid washing materials
Heating Load
This furnace should be sized to provide the design heating
load requirement. 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. The ductwork should be appropriately sized to
the capacity of the furnace to ensure its proper airflow rating.
For installations above 2,000 ft., the furnace should have
a sea level input rating large enough that it will meet the
heating load after deration for altitude.
Two-stage furnaces operate at two input rates to better meet
heating loads. The lower heating rate (low fire) is 65% of the
high fire rate. The greatest degree of control over the furnace
can be gained by controlling it with a two stage thermostat.
This allows the thermostat to directly request either high or
low fire. However, it is possible to operate the furnace using a
single stage thermostat. In this application the furnace control
can be set to increase from low to high fire, based on a timer.
See Autostaging for Single Stage Thermostats (
page 23).
Furnaces are properly sized to meet the expected maximum
heating load. But this load occurs infrequently. So, during
more moderate weather, the furnace is likely to use low fire
a considerable part of the time. This is normal and has the
benefit of quieter and more efficient operation.
Installation in a Garage
This Gas-fired furnace may be installed in a residential garage
with the provision that the burners and igniter are located no
less than 18 inches (457mm) above the floor. The furnace
must be located or protected to prevent physical damage
by vehicles.
WARNING:
Do not place combustible material on or against
the furnace cabinet or within 6 inches of the
vent pipe. Do not place combustible materials,
including gasoline or any other flammable vapors
and liquids, in the vicinity of the furnace.
Clearances to Combustible Materials
This furnace is Design Certified in the U.S. and Canada by
CSA International for the minimum clearances to combustible
materials. NOTE: The furnace is listed for installation on
combustible or non-combustible flooring. However, wood is
the only combustible flooring allowed for installation. To obtain
model number and specific clearance information, refer to
the furnace rating plate, located inside of the furnace cabinet.
Access for positioning and servicing the unit must be
considered when locating unit. The need to provide clearance
for access to panels or doors may require clearance distances
over and above the requirements. Allow 24 inches minimum
clearance from the front of the unit. However 36 inches
is strongly recommended. See
Figure 1 for minimum
clearance requirements.
Operation of Furnace During Construction
CAUTION:
Operating gas furnaces in construction
environments can cause a variety of problems
within the furnace and may significantly
reduce the life or the performance of the
furnace. Therefore operating the furnace during
construction is not permitted and will void the
warranty.
Figure 1. Minimum Clearances to
Combustible Materials
CLEARANCES TO COMBUSTIBLE MATERIALS
TOP
FRONT
UPFLOW
APPLICATIONS
HORIZONTAL
APPLICATIONS
VENT
SIDE
TOP
BOTTOM
VENT
FRONT
BACK
SIDE
LEFT SIDE
RIGHT SIDE
Left Side ................. 0 Inches Top ..........................0 Inches
Right Side ............... 0 Inches Front ........................
†
4 Inches
Vent ........................ 0 Inches Back........................ 0 Inches
†Allow 24 in. minimum clearance for servicing. Recommended clearance
is 36 in.