WARNING
Improper installation of the furnace can result in personal injury or death. Combustion and flue products must never be allowed to enter the return air system or air in the living space. Use sheet metal screws and joint tape to seal return air system to furnace.
In platform installations with furnace return, the furnace should be sealed airtight to the return air plenum. A door must never be used as a portion of the return air duct system. The base must provide a stable support and an airtight seal to the furnace. Allow absolutely no sagging, cracks, gaps, etc.
For no reason should return and supply air duct systems ever be connected to or from other heating devices such as a fireplace or stove, etc. Fire, explosion, carbon monoxide poisoning, personal injury and/or property damage could result.
The unit may be installed three ways in downflow applica- tions: on
Refer to Figure 11 for clearances in downflow applica- tions.
Downflow Application Installation Clearances
Top
Left Side | Right Side |
| Bottom | |
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| |
Top |
| 0 |
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|
*Front |
| 0 |
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Back |
| 0 |
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|
Sides |
| 0† |
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|
Vent |
| 0 |
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|
Floor |
| NC ‡ |
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*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. †Allow proper clearances to accommodate condensate trap.
‡The furnace may be installed on a combustible wood floor if an optional additive base is installed between the furnace and the combustible floor.
FIGURE 11
Installation on Non-Combustible Flooring (Figure 12)
1.Cut floor opening keeping in mind clearances listed on unit rating plate. Also keep in mind gas supply connections, 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.
NON−COMBUSTIBLE FLOOR OPENING SIZE
Cabinet Width | Front to Rear | Side to Side | |||
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| ||
in . | mm | in. | mm | ||
| |||||
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B Cabinet (17.5") | 19 − 3/4 | 502 | 16 − 5/8 | 422 | |
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| |
C Cabinet (21") | 19 − 3/4 | 502 | 20−1/8 | 511 | |
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NOTE: Floor opening dimensions listed are 1/4 inch (6 mm) larger than the unit opening. See dimension drawing on page 2.
TABLE 1
FURNACE
PROPERLY |
|
SIZED FLOOR | SUPPLY AIR |
OPENING | PLENUM |
FIGURE 12
Installation on Combustible Flooring (Figure 13)
1.When unit is installed on a combustible floor, a downflow combustible flooring base must be installed between the furnace and the floor. The base must be ordered separately. See Table 2 for opening size to cut in floor.
CAUTION
The furnace and combustible flooring base shall not be installed directly on carpeting, tile, or other combustible material other than wood flooring.
Page 10 of 48 | Issue 1109 |
