Installation In Upflow And Downflow Applications - Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual

"
5
⁄
16
5
"
3
1 ⁄
4
"
5
⁄
16
"
3
1 ⁄
4
3
1 ⁄
Fig. 17—Leveling Legs
1. Position furnace on its back. Locate and drill a 5/16–in.
diameter hole in each bottom corner of furnace. (See Fig. 17.)
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.
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 1.
2. Construct hole in floor per dimensions specified in Table 1
and Fig. 18.
3. Construct plenum to dimensions specified in Table 1 and Fig.
18.
4. If downflow subbase (KGASB) is used, install as shown in
Fig. 19.
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.
To remove furnace perforated, discharge duct flange, use wide
duct pliers or duct flange tool to bend flange back and forth until
it breaks off. Be careful of sharp edges. (See Fig. 21.)
"
⁄
16
"
1 3 ⁄
4
"
5
⁄
16
"
4
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Fig. 18—Floor and Plenum Opening Dimensions
Fig. 19—Furnace, Plenum, and Subbase Installed
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. 21.
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. 30 for location of jumper. Cut jumper close to
connector and remove wire to avoid a short circuit.
14
A
PLENUM
OPENING
B D
FLOOR
OPENING
C
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
on a Combustible Floor
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