Installation; Upflow Installation; Bottom Return Air Inlet; Side Return Air Inlet - Carrier 58CVA Installation, Start-Up, Operating And Service And Maintenance Instructions

AIR FROM INDOOR
UNCONFINED SPACE
FURNACE
INPUT
Free Area
(BTUH)
of Opening
(Sq In.)
66,000 100
88,000 100
11,000 110
132,000 132
154,000 154
* Free area shall be equal to or greater than the sum of the areas of all vent connectors in the confined space. Opening area must be increased if other gas appliances in
the space require combustion air.
the structure shall be at least 1 in. from the sides and back
and 6 in. from the front of the appliances. See Table 2 and
Fig. 8.
When ducts are used, they must be of the same cross sectional area
as the free area of the openings to which they connect. The
minimum dimension of ducts must not be less than 3 in.

INSTALLATION

Step 1—Upflow Installation

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 2 screws holding front filler
panel. (See Fig. 9.)
2. Rotate front filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall front filler panel and screws.

SIDE RETURN AIR INLET

These furnaces are shipped with bottom closure panel installed in
bottom return-air opening. This panel MUST be in place when
only side return air is used.
NOTE: Side return-air openings can be used in UPFLOW and
most HORIZONTAL configurations ONLY.

LEVELING LEGS (IF DESIRED)

In upflow position with side return inlet(s), leveling legs may be
used. (See Fig. 10.) Install field-supplied, 5/16 X 1 1/2 in. (max)
corrosion-resistant machine bolts, washers and nuts.
NOTE: Bottom closure must be used when leveling legs are used.
It may be necessary to remove and reinstall bottom closure panel
to install leveling legs. To remove bottom closure panel, see Step
1 above.
To install leveling legs:
1. Position furnace on its back. Locate and drill a hole in each
bottom corner of furnace. (See Fig. 10.)
2. For each leg, 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.
5. Reinstall bottom closure panel if removed.
Table 2–Minimum Free Area of Combustion Air Opening*
OUTDOOR AIR THROUGH
VERTICAL DUCTS
Free Area of
Round Pipe
Opening and Duct
(in. Dia)
(Sq. In.)
16.5
22.0
27.5
33
38.5
OUTDOOR AIR THROUGH
HORIZONTAL DUCTS
Free Area of
Opening and Duct
(sq In.)
5 33
6 44
6 55
7 66
7 77
Fig. 9—Removing Bottom Closure Panel
⁄ "
5
16
3
1
⁄
5
16
Step 2—Downflow Installation
NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when any one of the 3 accessories are
used:
• Special Base, KGASB0201ALL
• Cased Coil Assembly Part No. CD5 or CK5
8
OUTDOOR AIR THROUGH
SINGLE DUCT
Free Area of
Round Pipe
Opening and Duct
(in. Dia)
(Sq In.)
7 22.0
8 29.3
9 36.7
10 44.0
10 51.3
⁄ "
5
16
⁄ "
4
⁄ "
3
1
4
"
⁄ "
5
16
⁄ "
1 3
4
⁄ "
3
1
4
Fig. 10—Leveling Legs
Round Pipe
(In. Dia)
6
7
7
8
8
A02098
A02071