Installation; Leveling Legs (If Desired); Installation In Upflow And Downflow Applications; Installation In Horizontal Applications - Carrier Series 100 Installation, Start-Up, And Operating Instructions Manual

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Fig. 20—Leveling Legs
Combination of Indoor and Outdoor Air
1. Indoor openings shall compy with the Indoor Combustion
Air Method below and,
2. Outdoor openings shall be located as required in the Outdoor
Combustion Air Method mentioned previously and,
3. Outdoor openings shall be sized as follows:
a. Calculate the Ratio of all Indoor Space volume divided by
required volume for Indoor Combustion Air Method
below.
b. Outdoor opening size reduction Factor is 1 minus the
Ratio in a. above.
c. Minimum size of Outdoor openings shall be the size
required in Outdoor Combustion Air Method above
multiplied by reduction Factor in b. above. The minimum
dimension of air openings shall be not less than 3 in. (80
mm).

INSTALLATION

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NOTE: The 140 size unit may NOT be installed in non-direct
vent (1-pipe) application.
Step 1—Leveling Legs (If Desired)
When furnace is used in upflow position with side inlet(s), leveling
legs may be desired. (See Fig. 20.) Install field-supplied,
corrosion-resistant 5/16-in. machine bolts and nuts.
NOTE: The maximum length of bolt should not exceed 1-1/2 in.
1. Position furnace on its back. Locate and drill a 5/16–in.
diameter hole in each bottom corner of furnace. (See Fig. 20.)
Holes in bottom closure panel may be used as guide locations.
2. For each hole, install nut on bolt and then 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 arrangement.
NOTE: Bottom closure must be used when leveling legs are used.
See Bottom Closure Panel section.
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Step 2—Installation in Upflow and Downflow
Applications
NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when special base (available from
manufacturer) Part No. KGASB0201ALL is used. Special base is
not required when this furnace is installed on manufacturer's Coil
Assembly Part No. CD5 or CK5, or Coil Box Part No. KCAKC is
used.
1. Determine application being installed from Table 3.
2. Construct hole in floor per dimensions specified in Table 3
and Fig. 21.
3. Construct plenum to dimensions specified in Table 3 and Fig.
21.
4. If downflow subbase (KGASB) is used, install as shown in
Fig. 22.
If Coil Assembly Part No. CD5 or CK5 or Coil Box Part No.
KCAKC is used, install as shown in Fig. 20.
NOTE: Remove furnace perforated, discharge duct flanges when
they interfere with mating flanges on coil on downflow subbase.
A89014 To remove furnace perforated, discharge duct flange, use wide
duct pliers or duct flange tool or hand seamers to bend flange back
and forth until it breaks off. Be careful of sharp edges. (See Fig.
24.)
UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent unit
operation.
Do not bend duct flanges inward as shown in Fig. 21. This
will affect airflow across heat exchangers and may cause limit
cycling or premature heat exchanger failure. Remove duct
flange completely or bend it inward a minimum of 210° as
shown in Fig. 24.
NOTE: For 140 size unit when installed in downflow orientation,
cut the white jumper wire off between terminals PL1-7 and PL1-9.
Do not cut white jumper between terminals PL1-7 and PLI-11.
Refer to Fig. 32 for location of jumper. Cut jumper close to
connector and remove wire to avoid a short circuit.
Step 3—Installation in Horizontal Applications
UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent unit
operation.
The entire length of furnace MUST be supported when
furnace is used in a horizontal position to ensure proper
draining. When suspended, bottom brace supports sides and
center blower shelf. When unit is supported from the ground,
blocks or pad should support sides and center blower shelf
area.
These furnaces can be installed horizontally in either horizontal
left or right discharge position. In a crawlspace, furnace can either
be hung from floor joist or installed on suitable blocks or pad.
Furnace can be suspended from each corner by hanger bolts and
angle iron supports. (See Fig. 25.) Cut hanger bolts (4 each 3/8-in.
all-thread rod) to desired length. Use 1 X 3/8-in. flat washers,
3/8-in. lock washers, and 3/8-in. nuts on hanger rods as shown in
Fig. 25. Dimples are provided for hole locations. (See Fig. 2.)
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