TABLE 2
COMBUSTIBLE FLOORING BASE OPENING SIZE
Cabinet | Catalog | Front to Rear | Side to Side | |||
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Width | Number | in. | mm | in. | mm | |
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B Cabinet | 11M60 | 22 | 559 | 18 − 3/4 | 476 | |
(17.5") | ||||||
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C Cabinet | 11M61 | 22 | 559 | 22 − 3/4 | 578 | |
(21") | ||||||
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FURNACE
| COOLING COIL |
PROPERLY |
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SIZED FLOOR |
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OPENING | PLENUM |
FURNACE
PROPERLY SIZED FLOOR OPENING
SUPPLY AIR
PLENUM
COMBUSTIBLE FLOORING BASE
FIGURE 14
Return Air Opening −− Downflow Units
Return air may be brought in only through the top opening of a furnace installed in the downflow position. The follow- ing steps should be taken when installing plenum:
1 − Bottom edge of plenum should be flanged with a hemmed edge (See figure 15 or 16).
FIGURE 13
2 − After opening is cut, set the combustible flooring base into opening.
3 − Check fiberglass strips on the combustible flooring base to make sure they are properly glued and posi- tioned.
4 − Lower supply air plenum into the combustible flooring base until plenum flanges seal against fiberglass strips.
NOTE − Be careful not to damage fiberglass strips. Check for a tight seal.
5 − Set the furnace over the plenum.
6 − Ensure that the seal between the furnace and plenum is adequate.
Installation on Cooling Coil Cabinet Figure 14
2 − Sealing strips should be used to ensure an airtight seal between the cabinet and the plenum.
3 − In all cases, plenum should be secured to top of fur- nace using sheet metal screws.
4 − Make certain that an adequate seal is made.
PLENUM
(Field Provided) 
SECURE FROM OUTSIDE CABINET
SEALING STRIP | CABINET | |
SIDE PANEL | ||
(Field Provided) | ||
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Side View
FIGURE 15
NOTE − Downflow combustible flooring kit is not used..
1 − Refer to reverse−flow coil installation instructions for correctly sized opening in floor and installation of cabi- net.
2 − When cooling cabinet is in place, set and secure the furnace according to the instructions that are provided with the cooling coil. Secure the furnace to the cabinet.
PLENUM
(Field Provided)
SECURE FROM |
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INSIDE CABINET | Side View |
SEALING STRIP (Field Provided)
CABINET
SIDE PANEL
3 − Seal the cabinet and check for air leaks.
FIGURE 16
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