Grandaire WFAR080B048 - Page 28

INSTALLATION INSTRUCTIONS Gas Furnace: WFAR
28 440 01 7104 02
Specifications subject to change without notice.
HORIZONTAL TOP
RETURN NOT
PERMITTED FOR
ANY MODEL
A11038
A14006
1
2
3
*
RETURN
AIR
SUPPLY
AIR
HORIZONTAL TOP
RETURN NOT
PERMITTED FOR
ANY MODEL
*RETURN
AIR
*HORIZONTAL LEFT BOTTOM RETURN NOT PERMITTED
FOR ALL MODELS. SEE TABLE BELOW.
Figure 28 -- Horizontal Return Air Configurations and Restrictions
INPUT*
CASING
HORIZONTAL LEFT
RETURN AIR CONNECTIONS
CASING
WIDTH
CONNECTION
COMBIN
A
TION
WIDTH
INCHES
1ONLY 2ONLY 3ONLY
COMBINA
TION
OF 1 & 2
40,000
14 3/16 YES YES NO YES
17 1/2 YES YES NO YES
60,000
14 3/16 YES YES NO YES
17 1/2 YES NO NO YES
80,000
17 1/2 YES YES NO YES
21 YES YES NO YES
100,000 21 YES YES NO YES
120,000 24 1/2 YES YES NO YES
*NOTE: Not all models may be available in all casing sizes shown
in the table above
INPUT*
CASING
HORIZONTAL RIGHT
RETURN AIR CONNECTIONS
CASING
WIDTH
CONNECTION
COMBIN
A
TION
WIDTH
INCHES
1ONLY 2ONLY 3ONLY
COMBINA
TION
OF 1 & 2
40,000
14 3/16 YES YES NO YES
17 1/2 YES YES NO YES
60,000
14 3/16 YES YES NO YES
17 1/2 YES YES NO YES
80,000
17 1/2 YES YES NO YES
21 YES YES NO YES
100,000 21 YES YES NO YES
120,000 24 1/2 YES YES NO YES
*NOTE: Not all models may be available in all casing sizes shown
in the table above
2-IN.
(51 mm)
ROLLOUT PROTECTION REQUIRED
Install 12” x 22” (305 x 559 mm) sheet
metal in front of burner compartment
area.
30 IN. (762 mm)
MIN. WORK AREA
COMBUSTION - AIR PIPE
(SEE VENTING SECTION)
A11154
Figure 29 -- Working Platform for Attic Installation
NOTE: Local codes may require a drain pan and condensate trap when a condensing furnace is installed over a finished ceiling.