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38
9
″
Center Clip
side--to--side
A07691
Fig. 40 -- Bottom Mounted Filter Rack
3
″
1
1
/
4
″
1
1
/
2
″
11
/
16
″
26 Ga. Galvanized Steel
FAST part number 1008482
A07730
Fig. 41 -- Filter Clip Construction
Refer to Fig. 42 and for guidelines to install filters. Furnaces
which require larger filter media and have limited clearances on
one side of furnace, require a standoff filter rack, see Fig. 42,
available from your distributor.
Using Optional
Standoff Filter
Rack
A07731
Fig. 42 -- Standoff Filter Rack
Addition Of Air Conditioning
When a refrigeration coil is used in conjunction with this unit, it
must be installed parallel with or on the discharge side of the unit
to avoid condensation on 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
application. 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.
A 3
″
(76.2 mm) clearance is required on the right side of the
furnace in order to run the copper or plastic tubing for the
condensate drain line.
UNIT OPERATIONAL HAZARD
Failure to follow this caution may result in improper unit
operation.
This furnace is not approved for use with “N” style
evaporator coils. If installed with an “N” style evaporator
coil, improper limit operation may occur.
CAUTION
!
CHECKS AND ADJUSTMENTS
NOTE
:
Verify the input rate of the furnace.
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.
!
WARNING
Startup
NOTE
:
Refer to the start--up procedures in the “
User’s
Information Manual
” or to the “
Operating Instructions Label
” on
the furnace.
ELECTRICAL OPERATION 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 power to the furnace.
Check for wiring errors or
obstruction to blower.
!
WARNING
Gas Supply Pressure
Gas supply pressure should be within minimum and maximum
values listed on rating plate (minimum and maximum pressures,
refer to Table 5). Pressures are usually set by gas suppliers.
Manifold Gas Pressure Adjustment
NOTE
: Make adjustment to manifold pressure with burners
operating.
1. Remove the burner compartment door.
2. Remove the blower compartment door. Place a jumper
across furnace controls
R
to
W
. Replace blower compart-
ment door.
3. With gas
OFF
, connect manometer to tapped opening on
gas valve. Use manometer with a 0 to 15 inches of water
column range.
PG9Y
AA