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Rack Flanges Downward
Figure 25
The space in front of the filter rack inside the furnace bottom front
1
flange will provide about 2
/
2
(filter rack end cap), and to withdraw the filter from the rack and
reinsert it. The filter must be flexed as it is withdrawn from the rack in
order to clear the front bottom flange of the furnace.
Filter Rack with Flanges Upward:
Place the rack inside the furnace bottom with the duct flanges
upward. Center the filter rack over the furnace bottom opening and
secure it with the three(3) filter clips provided in the parts bag. See
Figure 26. The ductwork (with 90° end flanges) should fit against
the furnace bottom. Secure and seal the ductwork flanges directly
to the furnace bottom. The screws should be driven into the furnace
bottom outboard of the rack so that the screws do not penetrate the
rack in order to prevent interference during withdraw and insertion
of the filter in the rack.
11. Checks and Adjustments
Startup
NOTE: Refer to startup procedures in the Users Information
Manual.
!
ELECTRICAL SHOCK, FIRE, OR EXPLOSION
HAZARD.
Failure to follow this warning could result in personal
injury, death, and/or property damage.
If any sparks, odors or unusual noises occur,
immediately shut OFF gas and power to furnace.
Check for wiring errors or obstruction to blower.
Gas Supply Pressure
Gas supply pressure should be within minimum and maximum
values listed on rating plate. Pressures are usually set by gas
suppliers.
22
25--24--66
" (69 mm) to remove the filter retainer
Specifications are subject to change without notice
Figure 26
Rack Flanges Upward
Insert the filter into the rack, and insert the plastic filter retainer (filter
rack end cap) into the rack to close the rack opening.
Clips are supplied with the furnace or can be fabricated from sheet
metal (Figure 24). When installing a bottom--mounted filter inside
the furnace without the filter rack, install the filter clips on the edge of
the bottom duct opening with the wider end of the clips toward the
blower as shown in Figure 23. Insert filter into side clips first and
push filter back until it is fully engaged into back clip.
Addition Of Air Conditioning
When a refrigeration coil is used in conjunction with this furnace, it
must be installed on the discharge side of the furnace to avoid
condensation in the heat exchanger. All furnaces are designed with
a break--away duct flange on the supply air side of the furnace. This
allows for installation in the horizontal right or downflow
applications. The coil installation instructions must be consulted for
proper coil location and installation procedures. With a parallel flow
arrangement, dampers must be installed to prevent chilled air from
entering the furnace. If manually operated dampers are used, they
must be equipped with a means to prevent operation of either unit
unless the damper is in full heat or full cool position.
Copper or plastic tubing may be used for the condensate drain line.
(See Propane Gas Conversion Kit rating plate and instruction
manual for furnaces converted to Propane gas)
Manifold Gas Pressure Adjustment
NOTE: Make adjustment to manifold pressure with burners
operating.
!
FIRE OR EXPLOSION HAZARD.
Failure to follow this warning could result in
personal injury, death and/or property damage.
Turn OFF gas at shut off before connecting
manometer.
1.
With gas OFF, connect manometer to manifold pressure tap on
outlet of gas valve. See Figure 27. Use manometer with a 0 in
wc to 12 in wc range.
2.
Turn gas ON. Operate the furnace by using a jumper wire on
the R to W thermostat connections on the control board.
25--24--66a
441 01 5003 01
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