Carrier 912SD Installation, Start-Up, Operating And Service And Maintenance Instructions page 21

912SD: Installation, Start-up, Operating and Service and Maintenance Instructions
14-3/16 and 17-1/2-in.
Furnace
16-in. Media Cabinet
Media Cabinet Installation
Side Return
21- or 24-1/2-in.
Furnace
Up to 5-Ton AC
capacity airflow
20- or 24-in. Media
Cabinet
Bottom Return Plenum
20- or -24-in. Media Cabinet Installation
for Combination Side and Bottom Return
14-3/16-in. Furnace
Screw Screw
Filler plates
14- - 3/16-in. Furnace with Filler Plates, Centered
Fig. 26 – Optional Media Cabinet Accessory
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4-in.
Block Off
21-in. Furnace
Plate
4-Ton or less, AC
capacity airflow
1/2-in.
Screws
20-in. Media Cabinet
Media Cabinet Installation Option for
4-Ton or Less A/C Capacity
21-in. Furnace
up to 5-Ton AC
Capacity
24-1/2-in. Furnace
up to 4-Ton AC
Capacity
45°
Transition
20- or 24-in. Media Cabinet
20- or -24-in. Media Cabinet Installation
with Angled Transition
14-3/16-in. Furnace
Screws
Filler plate
14- - 3/16-in. Furnace with Filler Plates, Off- - Set to Right
A11437
COMBUSTION - AIR PIPE
(SEE VENTING SECTION)
ROLLOUT PROTECTION REQUIRED
Install 12" x 22" (305x559 mm) sheet metal in front of burner compartment
area. The sheet metal MUST extend underneath the furnace casing by 1-in.
(25 mm) with the door removed. The bottom closure panel may be used for
flame roll-out protection when bottom of furnace is used for return air connection.
NOTE: Local codes may require a drain pan and condensate trap when a
condensing furnace is installed over a finished ceiling.
Fig. 27 – Working Platform for Attic Installation
ROLLOUT PROTECTION REQUIRED
Install 12" x 22" (204 x 559 mm) sheet metal in front of and above the burner compartment area.
The sheet metal MUST extend above the furnace casing by 1-in. (25 mm with the door removed.
A 1-in. (25 mm) clearance minimum between top of furnace and combustible material is required.
The entire length of furnace must be supported when furnace is used in horizontal position to
ensure proper drainage.
NOTE: FURNACE SHOWN IS A DIRECT-VENT APPLICATION. REFER TO THE VENTING SECTION FOR
ALLOWABLE VENT CONFIGURATIONS.
NOTE: Local codes may require a drain pan and condensate trap when a
condensing furnace is installed over a finished ceiling.
Fig. 28 – Suspended Furnace Installation
Leveling Legs (If Desired)
In upflow position with side return inlet(s), leveling legs may be used.
See Fig. 29. Install field-supplied, 5/16 x 1-1/2 in. (8 x 38 mm) (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
To install leveling legs:
1. Position furnace on its back. Locate and drill a hole in each bottom
corner of furnace.
21
30 IN. (762 mm)
MIN. WORK AREA
2-IN.
(51 mm)
COMBUSTION-AIR PIPE
(SEE VENTING SECTION)
2-IN.
(51 mm)
Fig. 24.
A150580
A150581