507404-02 Page 9 of 80Issue 1448
INSTALLATION
Setting Equipment
Shipping Bolt Removal
Units with 1/2 hp blower motor are equipped with three
exible legs and one rigid leg. The rigid leg is equipped
with a shipping bolt and a at white plastic washer (rather
than the rubber mounting grommet used with a exible
mounting leg). See Figure 10. The bolt and washer must
be removed before the furnace is placed into operation.
After the bolt and washer have been removed, the rigid leg
will not touch the blower housing.
Upow Applications
The gas furnaces can be installed as shipped in the upow
position. Refer to Figure 12 for clearances. Select a location
that allows for the required clearances that are listed on
the unit nameplate. Also consider gas supply connections,
electrical supply, vent connection, condensate trap and
drain connections, and installation and service clearances
[24 inches (610 mm) at unit front]. The unit must be level
from side to side. Tilt the unit slightly (maximum 1/2 in. from
level) from back to front to aid in the draining of the heat
exchanger. See Figure 11.
Allow for clearances to combustible materials as indicated
on the unit nameplate.
WARNING
Blower access panel must be securely in place when
blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into living
space resulting in personal injury or death.
WARNING
Do not connect the return air ducts to the back of the
furnace. Doing so will adversely affect the operation of
the safety control devices, which could result in personal
injury or death.
When ducts are used, they shall be of the same cross-
sectional area as the free area of the openings to which they
connect. The minimum dimension of rectangular air ducts
shall be no less than 3 inches (75 mm). In calculating free
area, the blocking effect of louvers, grilles, or screens must
be considered. If the design and free area of protective
covering is not known for calculating the size opening
required, it may be assumed that wood louvers will have 20
to 25 percent free area and metal louvers and grilles will
have 60 to 75 percent free area. Louvers and grilles must be
xed in the open position or interlocked with the equipment
so that they are opened automatically during equipment
operation.
Figure 11
SETTING EQUIPMENT
Tilt the unit slightly (Max. 1/2”) from back to front to aid in the draining of
the heat exchanger.
Unit must be level side-to-side in all applications.
Figure 10
Units with 1/2 HP
Blower Motor
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