International comfort products R9MSB0801716 Installation Instructions Manual page 28

INSTALLATION INSTRUCTIONS
Figure 27 − Upflow Return Air Configurations and
Restrictions
HORIZONTAL TOP
RETURN NOT
PERMITTED FOR
ANY MODEL
RETURN AIR CONNECTIONS
CASING CASING
CONNECTION
WIDTH WIDTH
INCHES 1 ONLY 2 ONLY
INPUT*
14 3/16 YES
40,000
17 1/2 YES
14 3/16 YES
60,000
17 1/2 YES
17 1/2 YES
80,000
21 YES
100,000 21 YES
120,000 24 1/2 YES
*NOTE: Not all models may be available in all casing sizes shown
in the table above
28
ANY COMBINATION OF 1, 2, OR 3 PERMITTED.
A11036
Figure 29 − Horizontal Return Air Configurations and Restrictions
HORIZONTAL LEFT
COMBINATION COMBINATION
3 ONLY
OF 1 & 2
YES NO YES
YES NO YES
YES NO YES
NO NO YES
YES NO YES
YES NO YES
YES NO YES
YES NO YES
Specifications subject to change without notice.
Figure 28 − Downflow Return Air Configurations
and Restrictions
HORIZONTAL TOP
RETURN NOT
PERMITTED FOR
ANY MODEL
SUPPLY
AIR
*RETURN
AIR
*HORIZONTAL LEFT BOTTOM RETURN NOT PERMITTED
FOR ALL MODELS. SEE TABLE BELOW.
RETURN AIR CONNECTIONS
CASING CASING
CONNECTION
WIDTH WIDTH
INCHES 1 ONLY 2 ONLY
INPUT*
14 3/16 YES
40,000
17 1/2 YES
14 3/16 YES
60,000
17 1/2 YES
17 1/2 YES
80,000
21 YES
100,000 21 YES
120,000 24 1/2 YES
*NOTE: Not all models may be available in all casing sizes shown
in the table above
Gas Furnace: R9MSB
A11037
3
1
RETURN
AIR
*
2
A14006
HORIZONTAL RIGHT
COMBINATION COMBINATION
3 ONLY
OF 1 & 2
YES NO YES
YES NO YES
YES NO YES
YES NO YES
YES NO YES
YES NO YES
YES NO YES
YES NO YES
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