Note: The three(3) screws in the top panel of the furnace next to the duct flange MUST be removed to provide serviceability of the primary heat exchangers in the downflow installation
1.Position plenum through the floor and set the furnace over the opening in the floor. If necessary, grout around the base to seal air leaks between the base and the floor.
Combustible Floor Installation
!WARNING
FIRE HAZARD
Failure to install unit on noncombustible subbase could result in personal injury, death, and/or property damage.
Place furnace on noncombustible subbase on downflow applications, unless installing on non- combustible flooring. The noncombustible subbase also must be used on downflow applications in addition to a coil box installation.
Subbase for Combustible Floor
NOTE: The three(3) screws in the top panel of the furnace next to the duct flange MUST be removed to provide serviceability of the primary heat exchangers in the downflow installation
Note: When using the subbase for combustible floors, the discharge air duct flanges on the furnace MUST be broken down to provide proper fit up to the subbase. Use duct pliers to bend the duct flanges flat onto the furnace casing. DO NOT bend the duct flanges inward (toward the heat exchangers) as air flow restrictions may occur.
The Subbase for Combustible Floors MUST be used when a downflow furnace is set on a combustible floor, even when the furnace is installed on a coil box.
1.Cut the opening in the floor according to Table 9. The hole in the floor must be cut to the dimensions listed in Table 9 since the base is equipped with locating tabs that center the base over the opening.
The opening in the base is 11/4″ (31.8mm) shorter and 11/8″ (28.6mm) narrower than the recommended size of the opening in the floor. This is done to maintain clearance between the floor and the plenum.
2.Fabricate the plenum to the dimensions given in Table 9. Note that the dimensions given are outside dimensions.
3.Set the base over the opening in the floor, centering it over the opening. Fasten the base to the floor with screws or nails. See Fig. 47, 48, and 49.
4.Drop the plenum through the opening in the base. The flange of the plenum should rest on top of the subbase.
58HDV
| Table 9 |
| Subbases for Combustible Floors Dimensions |
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| Opening In Floor |
| Opening In | Typical Plenum | |||||||||
| Combustible Floors |
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| Floor Dimensions |
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| Base For Plenum | Dimensions | ||||||
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| Part Number |
| H* |
| J* | K** | L | M | N |
| P | R | S | T | |
| Furnace Only |
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| KGASB0301P01 |
| 195/16 |
| 283/4 | 183/16 | 16(406.4) | 161/4 | 181/4 |
| 15 (381) | 171/8 | 15 (381) | 171/8 | |
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| (490.5) |
| (730.3) | (462) |
| (412.8) | (463.6) |
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| (435.6) |
| (435.6) |
| KGASB0401P02 |
| 2215/16 |
| 283/4 | 2113/16 | 16(406.4) | 161/4 | 217/8 |
| 15 (381) | 193/4 | 15 (381) | 193/4 | |
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| (582.6) |
| (730.3) | (554) |
| (412.8) | (555.6) |
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| (501.7) |
| (501.7) |
| KGASB0801P06 |
| 2411/16 |
| 283/4 | 239/16 | 16(406.4) | 161/4 | 235/8 |
| 15 (381) | 221/2 | 15 (381) | 221/2 | |
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| (627.1) |
| (730.3) | (598.5) |
| (412.8) | (600.1) |
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| (571.5) |
| (571.5) |
| Subbase for Coil Box |
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| KGASB0501P03 |
| 193/8 |
| 209/16 | 183/16 | 161/16 | 161/4 | 181/4 |
| 15 (381) | 171/8 | 15 (381) | 171/8 | |
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| (181.1) |
| (522.3) | (462) | (408) | (412.8) | (463.6) |
| (435.6) | (435.6) | ||||
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| KGASB0601P04 |
| 23 (284.2) | 209/16 | 2113/16 | 161/16 | 161/4 | 217/8 |
| 15 (381) | 193/4 | 15 (381) | 193/4 | ||
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| (522.3) | (554) | (408) | (412.8) | (555.6) |
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| (501.7) |
| (501.7) |
| KGASB0701P05 |
| 243/4 |
| 209/16 | 239/16 | 161/16 | 161/4 | 235/8 |
| 15 (381) | 221/2 | 15 (381) | 221/2 | |
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| (628.7) |
| (522.3) | (598.5) | (408) | (412.8) | (600.1) |
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| (571.5) |
| (571.5) |
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* | Outside Dimension |
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** | Base Spacer Side To Side |
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Conversion: 1 in = 25.4 mm
41
