Locating the Furnace
1.The furnace should be located in the same room as the central system and as close as possible, but not closer than 9". There should be no wall between the furnace and the warm air outlet duct that is connected directly to the warm air outlet plenum of the central furnace. (See Fig. 4)
2.Place the furnace on a noncombustible floor.
3.Check figures 3 through 5. Be sure you have the clearances shown below from the furnace and the connector pipe to combustible sur- faces. If you have a solid brick or stone wall behind your furnace, you can place the furnace as close as you wish to the wall. If the wall is only faced with brick or stone, treat it as a combustible wall.
18"
6" CHIMNEY
21" |
12" | CENTRAL | |
FURNACE | ||
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| 9" |
48"
Figure 4
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| 1357M | 1557M | 18" | |
Unit to Sidewall | 12" | 12" | |||
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(305mm) | (305mm) |
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Unit to Backwall | 30" | 30" | 6" SOLID DAMPER | ||
(760mm) | (760mm) | ||||
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Front of Unit to | 48" | 48" | 6" BAROMETRIC | ||
Combustible | (1.22m) | (1.22m) | |||
DRAFT REGULATOR | |||||
Chimney Pipe | 18" | 21" | |||
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to Sidewall | (460mm) | (530mm) |
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Chimney Pipe | 18" | 18" | 18" | ||
to Backwall | (460mm) | (460mm) |
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Plenum to | 6" | 6" |
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Combustibles | (150mm) | (150mm) |
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PLENUM |
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TO | 6" MIN. |
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CEILING |
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| 2" MIN. AIR SPACE |
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| REQUIRED BY CODE |
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Figure 5
CENTRAL
FURNACE
Figure 3
7