Specifications

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When unloading and setting the unit, use the lifting lugs
provided or move the equipment on rollers. Hooks,
jacks, or chains must not be used around the casing,
main control panel or exterior mounted controls.
During transit, unloading and setting of the unit, bolts
and nuts may have become loosened, particularly in the
pillow block ball bearing assemblies in the fan section. It
is recommended that all nuts and setscrews be tight-
ened. Turn fan shaft by hand to make certain that
blower does not rub against blower housing, and that
bearing setscrews are tight.
Open the cover on the electrical control box located on
the unit and ensure that all connections are tight.
B. Locating the Unit
Prior to locating the unit, authorities having jurisdiction
should be consulted before installations are made. Ap-
proval permits should be checked against the unit re-
ceived.
Combustion air shall be provided at a rate of at least 10
CFM, or 1 square inch of free opening, per 1000 BTU
per hour of rated input. If a separate mechanical means
provides this air, an interlock with the combustion
blower shall be provided.
The rated output of gas burning appliances decreases
with higher altitudes above 2,000 feet, the furnace shall
be de-rated 4 % for each 1,000 feet of altitude above
sea level. Factory testing rating plate information is
recorded on sea level conditions. High altitude ratings
may be obtained by a change in manifold pressure.
Appliances must be suitably marked to indicate their
altitude adjusted input rating.
Under no circumstances should this equipment be in-
stalled in a negatively pressurized space. Consult juris-
dictional authority for proper ventilation requirements.
Combustion air containing or recirculation of room air
may be hazardous in the presence of:
a) Flammable solids, liquids and gases.
b) Explosive materials (i.e., grain, dust, coal dust.
gunpowder, etc).
c) Substances, which may become toxic when,
exposed to heat (i.e., refrigerant, aerosols, etc.).
Locate the unit exactly level. Special attention should be
given to the duct, electrical, and fuel connection points.
Install ductwork with adequate flexible connection to
isolate vibration from the ductwork.
All ductwork should have taped or caulked seams.
Ductwork should be properly sized so as not to inhibit
airflow. This information should be crossed-checked
with the position of support beams and stand pipes to
insure that clearance dimensions coincide with those of
the unit. The minimum clearance to combustible mate-
rial must be maintained as listed in Table 1
Table 1
Minimum clearance to combustible material, also,
consult local codes and regulations.
Clearances to Combustible Material
Vertical Units Horizontal Units
Front* 48 inches 48 inches
Rear 18 inches 18 inches
Right 18 inches 18 inches
Left 18 inches 18 inches
Top 18 inches 18 inches
Floor Zero 6 inches
*Consider control side as front of unit
In addition to the combustible clearances listed above,
access for service should be allowed around the unit.
The recommended minimum access clearance is
shown in Table 2.
Table 2
Unit Minimum Unit Minimum
Size Access* Size Access*
*Optimum clearance for shaft removal for units with
centrifugal blowers would be equivalent to cabinet width.
On outdoor curb mounted installations, flash and seal
the roof curb to prevent leakage. The cross section of
factory provided curb is formed to accept wood nailing
strip and insulation provided by others.
It is the customer and installation personnel responsibil-
ity to determine if the unit is equipped with all of the
safety devices required for the particular application.
Safety considerations include the accessibility of the
unit to non-service personnel, the provision of electrical
lockout switches, maintenance procedures, and auto-
matic control sequences. Clearly mark all emergency
shut off devices.
Up to
1750
MBH
Output
36 inches
2000 MBH
Output
and Larger
50 inches