Air Ducts; General - Carrier 58MCB Installation, Start-Up, And Operating Instructions Manual

PERFORATED
DISCHARGE DUCT
FLANGE
Fig. 24—Duct Flanges
3-IN. MINIMUM CLEARANCE TO
COMBUSTION-AIR INTAKE IS REQUIRED
(NON-DIRECT VENT/1-PIPE
APPLICATION,SIZES 040
THROUGH 120 ONLY)
ANGLE
IRON OR
EQUIVALENT
(B)
(A) ROD LOCATION
USING DIMPLE
LOCATORS
(SEE DIMENSIONAL
DWG FOR
LOCATIONS)
(A) PREFERRED ROD LOCATION
(B) ALTERNATE ROD LOCATION
→ Fig. 25—Crawlspace Horizontal Application for Direct Vent/2-Pipe Installation (Sizes 040 Through 140) and
for Non-Direct Vent/1-Pipe Installation (Sizes 040 Through 120 Only)
NO
YES
210°
MIN
YES
A93029
COMBUSTION-AIR INTAKE
(NON-DIRECT VENT/1-PIPE
APPLICATION,SIZES 040
THROUGH 120 ONLY)
(B)
(A)
3
/ -IN. HEX NUT
8
& WASHER (4)
REQD PER ROD
NOTES:
Step 4—AIR DUCTS
GENERAL REQUIREMENTS
The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA), Sheet Metal and
Air Conditioning Contractors National Association (SMACNA) or
American Society of Heating, Refrigerating and Air Conditioning
Engineers (ASHRAE) or consult The Air Systems Design Guide-
lines reference tables available from your local distributor. The
duct system should be sized to handle the required system design
CFM at the design static pressure.
When a furnace is installed so that the supply ducts carry air
circulated by the furnace to areas outside the space containing the
furnace, the return air shall also be handled by a duct(s) sealed to
the furnace casing and terminating outside the space containing the
furnace.
Secure ductwork with proper fasteners for type of ductwork used.
Seal supply- and return-duct connections to furnace with code
approved tape or duct sealer.
COMBUSTION-AIR PIPE
(DIRECT VENT/2-PIPE
APPLICATION,ALL SIZES)
"
3
5 ⁄
4
DRAIN
(A)
(B)
13
/ -IN. MAX
16
(A) (B)
ALTERNATE SUPPORT
LOCATION FROM BACK
1. A 1 In. clearance minimum between top of
furnace and combustible material.
2. The entire length of furnace must be
supported when furnace is used in horizontal
position to ensure proper drainage.
3. For non-direct vent/1-pipe application,
bottom side combustion-air entry cannot be
used when furnace is installed with hangers
as shown.
21
VENT
3
⁄
8 -IN. ROD
ALTERNATE SUPPORT
LOCATION 4-IN. MIN
8-IN. MAX
A05054