Carrier 100 Series - Filter Arrangement; Leveling Legs; Gas Piping; Clearance

A WARNING
Do not install the furnace on its back or sides. Safety control
operation will be adversely affected. Never connect return-air
ducts to the back of the furnace. A failure to follow this
warning can cause a fire, personal injury, or death.
Step 3—FILTER ARRANGEMENT
The factory-supplied filter(s) is shipped in the blower compart¬
ment. Determine location for the filter and move filter retaining
hardware, if necessary, before attaching the return-air duct. After
the return-air duct has been connected to the furnace, install the
filter(s) inside the furnace blower compartment. See Fig. 4 for side
return application and Fig. 5 for bottom return application.
COMBINATIONS OF OPENINGS:
A&B C&D D&E
A89013
Fig. 3—Air For Combustion and Ventilation
(Outside Air)
A bottom closure panel is factory installed in the bottom of the
furnace. When bottom return inlet is desired, remove and discard
the enclosure panel.
Filter-retaining brackets, supports, and retainers are factory assem¬
bled and shipped installed for side return application, with 1 set of
all required hardware on each furnace. (See Fig. 4.)
For bottom return applications, remove the brackets (front and
back) and supports from each side. The back bracket(s) are
installed in the rear of the furnace casing (dimples are provided to
mark mounting screw locations).
The front bracket(s) are installed on the bottom front plate as
shown in Fig. 5, once the bottom enclosure has been removed.
Rotate filter supports 180° so filter will rest on support, and
FILTER
RETAINER
SPRING
A93045
Fig. 4—Side Filter Arrangement
reinstall. (Do not reinstall in 17-1/2 in. casing.) Install the filter
retaining rod (small U-shaped end) in the rear bracket, and the
front of the filter retainer rod as shown in Fig. 5. Two sets of
hardware are needed for furnaces in 24-1/2 in. casings using 2
filters for bottom return. All hardware is provided for filter
installation.
NOTE: Furnaces with a 17-1/2 in. wide casing require an
additional procedure when locating the filter for bottom return-air
application. Field-fabricate a sheet metal filler strip 1 X 3 X 24-1/2
in. and install it along side of the filter as shown in Fig. 5. Drive
2 screws through the casing side and into the filler strip to secure
it in place. Filter is to rest on top of the filler strip when installed.
Table 3—Filter Information (In.)
FURNACE
FILTER SIZE*
FILTER
CASING WIDTH
Side Return
Bottom Return
TYPE
14-3/16
(1) 16 X 25 X It
(1) 14X25X1
Cleanable
17-1/2
(1) 16 X 25 X It
(1) 16X25X1
Cleanable
21
(1) 16X25X 1
{1)20X25X 1t
Cleanable
24-1/2
(2) 16X25 X It (1)24X25X1
Cleanable
*FiIters can be field-modified by cutting the frame as marked and folding to the
desired size. Alternate sizes can be ordered from your distributor or dealer.
tFactory provided with the furnace.
A WARNING
Never operate unit without a filter or with filter access door
removed. A failure to follow this warning can cause a fire,
personal injury, or death.
Step 4—LEVELING LEGS (If Required)
When the furnace is used with side inlet(s) and leveling legs are
required, refer to Fig. 6 and install field-supplied corrosion-
resistant 5/16-in. machine bolts and nuts.
NOTE: The length of the bolt should not exceed 1-1/2 in.
1. Lay furnace on its back, locate and drill 5/16-in. diameter hole
in each bottom comer of furnace as shown in Fig. 6.
2. Install nut on bolt and install bolt and nut in hole. (Install flat
washer if desired.)
3. Install another nut on other side of furnace base. (Install flat
washer if desired.)
4. Adjust outside nut to provide desired height, and tighten inside
nut to secure anangement.
Step 5—GAS PIPING
Gas piping must be installed in accordance with national and local
codes. Refer to the current edition of the National Fuel Gas Code.
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