Downflow Installation - Carrier 58PHA/PHX Installation, start-up, operating and Installation And Operating Instructions Manual

5/ 16
"
(8mm)
(8mm)
5/ 16
1 3 /
"
4
(44mm)
(8mm)
5 /
"
16
(44mm) 1 3/ 4
"
1 3/ 4
(44mm)
Fig. 10 - - Leveling Legs
4. Adjust outside nut to provide desired height, and tighten
inside nut to secure arrangement.
5. Reinstall bottom closure panel if removed.

DOWNFLOW INSTALLATION

NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when any one of the following 3
accessories are used:
S Special Base, KGASB
S Cased Coil Assembly Part No. CNPV, CNRV, CAP, or
CAR
S Coil Box Part No. KCAKC
1. Determine application being installed from Table 4.
2. Construct hole in floor per Table 4 and Fig. 11.
3. Construct plenum to dimensions specified in Table 4 and
Fig. 11.
4. If downflow subbase, KGASB is used, install as shown in
Fig. 12. If Coil Assembly Part No. CNPV, CNRV, CAP
and CNR or Coil Box PartNo. KCAKC is used, install as
shown in Fig. 13.
NOTE: It is recommended that the perforated supply- -air duct
flanges be completely folded over or removed from furnace when
installing the furnace on a factory- -supplied cased coil or coil box.
To remove the supply- -air duct flange, use wide duct pliers or
hand seamers to bend flange back and forth until it breaks off. Be
careful of sharp edges. (See Fig. 14.)
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return- -air opening. Remove and discard this panel when
bottom return air is used. To remove bottom closure panel,
perform the following:
1. Tilt or raise furnace and remove two screws holding
bottom filler panel. (See Fig. 9.)
2. Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws
"
1 3 /
"
4
(44mm)
(8mm)
5/ 16
"
"
A89014
A
PLENUM
OPENING
B
C
Fig. 11 - - Floor and Plenum Opening Dimensions
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
Fig. 12 - - Furnace, Plenum, and Subbase Installed
on a Combustible Floor
11
D
FLOOR
OPENING
A96283
A96285