Table 1--Minimum Clearances To Combustib{e Materials (In.)
UNIT APPLICATION UPFLOW DOWNFLOW HORIZONTAL
Furnace 0 2 2
Sides Supply Plenum and Warm-Air Duct Within 6 ft
of Furnace 1 2 1
Back Service Clearance 0 1 0
Furnace Casing or Plenum 2 2 2
Top Horizontal Warm-Air Duct Within 6 ft of
Furnace 2 2 3
Bottom 0 0* 0*
FJue Horizontally or Below Pipe 4 4 4
Pipe Vertically Above Pipe 9 9 9
Front 8 8 24
* Use approved subbase for combustible floor.
NOTE: Adequate service clearances should be provided over and above these dimensions as required
The air handling capacity of this furnace is designed %r cooling
airflow. Rot'or to Table 12 _br expected airflows at various external
duct static pressures.
LOCATION
Step l--General
This t:urnace is not water tight and is not designed fbr outdoor
installation. This t:urnace shall be installed in such a manner
as to protect electrical components tiom water. Outdoor
installation would lead to a hazardous electrical condition and
to premature _;amace _hilure.
Do not use this t'urnace as a construction heater. Use of this
furnace as a construction heater exposes furnace to abnomxa]
conditions, contaminated combustion air, and tack of air
filters. Failure to follow this warning can lead to premature
furnace failure and/or vent fi_ilure which could result in a fire
hazard and/or bodily harm.
For attic installation, it is important to keep insulation 12 in
or more away fiom any _/mace openings. Some types of
insulating materials may be combustibles and may cause a
fire haza*d and proper w damage
This furnace is approved ['or reduced clearances to combustible
constn/ction, therefore, it may be installed in a closet or similar
enclosure Since this unit may be installed in an upflow, counter°
flow, or horizontal position, it may be located in a basement or on
the same level as area to be heated. [n any case, unit should always
be installed level
In a basement, or when installed on floor (as in a crawlspace), it is
recommended that unit be installed on a concrete pad that is 1 in
to 2 in thick
When installed in counterflow position, furnace must not be
installed on combustible flooring, unless approved subbase is used.
Also, since flue pipe is in a counterflow position, Downflow
Conversion/Vent Guard Kit MUST be used, (Also, read page 9.)
When installed in a horizontal position, t:m'nace may be suspended
by using an angle iron frame, as tong as total weight of both
furnace and fi'ame are allowed _br in support calculations. (Other
methods of suspending are acceptable.) When installed in the
Horizontal Position, this fi/rnace must not be installed on combus=
tible flooring, unless the approved Horizontal Subbase is used.
The required n_ininmm clearances %r furnace are specified in
Table 1.
The _i/rnace should be located as close as possible to chinmey or
vent in order to keep vent connections short and direct The
Da'nace should also be located as near as possible to center of air
distribution system.
Step 2--Location Relative to Cooling Equipment
When installing f_/mace with cooling equipment for year-round
operation, the t'ollowing recommendations must be followed _br
series or parallel airflow:
1. In series airflow applications, coil is mounted after furnace in
an enclosure in supply-air stream. The [:urnace blower is used
for both heating and cooling airflow.
The coil MI. ST be installed on air discharge side of furnace
Under no circumstances should airflow be such that cooled,
conditioned air can pass over _itmace heat exchanger. This
will cause condensation in heat exchanger and possible
_hilure of heat exchanger which could lead to a fire hazard
and/or a hazardous condition which may lead to bodily harm.
Heat exchanger _itilure due to improper installation may not
be covered by warranty
2 In parallel airflow applications, dampers must be provided to
direct air over f_/mace heat exchanger when heat is desired and
over cooling coil when cooling is desired.
INPORTANT: The dampers should be adequate to prevent cooled
air fi'om entering furnace. If manually operated, dampers must be
equipped with a means to prevent operation of either cooling unit
or _i/rnace unless damper is in full cooi or heat position.
mNSTALLATION
Step l--Air for Combustion and Ventilation
Installation of this filrnace in an area where it will receive
contaminated combustion air must be avoided Such contami=
nation would include the following: ammonia, chlorine,
hy&ogen sulfide, halogenated hy&ocarbons, carbon tetra°
chloride, cleaning solvents, hy&ochloric acid, water soften°
ing chemicals, and similar chemicals. Failure to fbllow this
warning will lead to premature resting of heat exchanger and
possible premature furnace fbilure and/or vent fhilure which
could result in fire hazard and/or bodily harm.
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