Downflow Installation
Downflow unit installs in three ways: on non−combustible flooring, on combustible flooring using a downflow com- bustible flooring base, or on a reverse−flow cooling cabinet. Do not drag the unit across the floor.
Installation on Non−Combustible Flooring (Figure 6)
1 − Cut floor opening keeping in mind clearances listed on unit rating plate. Also keep in mind gas supply connec- tions, electrical supply, flue and air intake connections and sufficient installation and servicing clearances. See table 1 for correct floor opening size.
2 − Flange warm air plenum and lower the plenum into the opening.
3 − Set the unit over the plenum and seal the plenum to the unit.
4 − Ensure that the seal is adequate.
SL280DFV UNIT |
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OPENING | SUPPLY AIR |
PLENUM |
FIGURE 6
TABLE 1
NON−COMBUSTIBLE FLOOR OPENING SIZE
| Front to Rear | Side to Side | |||
Cabinet Width |
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in. | mm | in. | mm | ||
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A (14.5") | 19−3/4 | 502 | 13−1/4 | 337 | |
B (17.5") | 19−3/4 | 502 | 16−1/4 | 413 | |
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C (21") | 19−3/4 | 502 | 19−3/4 | 502 | |
NOTE − Door opening dimensions listed are 1/4 inch (6 mm) larger than the unit opening. See unit dimensions on page 2.
Installation on Combustible Flooring (Figure 7)
1 − When unit is installed on a combustible floor, a down- flow combustible flooring base must be installed be- tween the furnace and the floor. The base must be or- dered separately.
See table 2 for opening size to cut in floor.
CAUTION
The furnace and downflow combustible flooring base shall not be installed directly on carpeting, tile, or other combustible material other than wood floor- ing.
SL280DFV UNIT |
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| SUPPLY AIR PLENUM | |
PROPERLY | DOWNFLOW | |
COMBUSTIBLE | ||
SIZED FLOOR | ||
FLOORING BASE | ||
OPENING | ||
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FIGURE 7
TABLE 2
COMBUSTIBLE FLOOR OPENING SIZE
| Front to Rear | Side to Side | |||
Cabinet Width |
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in. | mm | in. | mm | ||
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A (14.5") | 22 | 559 | 15−3/4 | 400 | |
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B (17.5") | 22 | 559 | 18−3/4 | 476 | |
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C (21") | 22 | 559 | 22−3/4 | 578 | |
NOTE − Floor opening dimensions listed are 1/4 inch (6 mm) larger than unit opening. See unit dimensions on page 2.
2 − After opening is cut, set combustible flooring base into opening.
3 − Check sealing strips on combustible flooring base to make sure they are properly glued and positioned.
4 − Lower supply air plenum into downflow combustible flooring base until plenum flanges seal against the strips.
NOTE − Be careful not to damage sealing 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 Cabinet (Figure 8)
1 − Refer to reverse−flow coil installation instructions for correctly sized opening in floor and installation of cabi- net.
NOTE − Downflow combustible flooring kit is not used
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.
3 − Seal the cabinet and check for air leaks.
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