PRODUCT DESIGN
Accessibility Clearances (Minimum)
Unobstructed front clearance of 24" for servicing is rec- ommended.
MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHES
Sides | Rear | Front* |
| Vent | Top | |
SW |
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1 | 0 | 3 | 6 |
| 1 | 1 |
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*24" clearance for serviceability recommended.
**Single Wall Vent (SW) to be used only as a conncetor.
Refer to the venting tables outlined in the Installation Manual for additional venting requirements.
Note: In all cases accessibility clearance shall take prece- dence over clearances from the enclosure where accessi- bility clearances are greater. All dimensions are given in inches.
High Altitude Derate
When this furnace is installed at high altitude, the appropri- ate High Altitude orifice kit must be installed. This is re- quired due to the natural reduction in the density of both the gas fuel and combustion air as altitude increases. The kit will provide the proper design certified input rate within the specified altitude range.
INPUT PER BURNER - 22,500 BTUH NATURAL GAS / 20,000 BTUH L.P.
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| 2000 | 3000 |
| 4000 | 4500 | 5000 | 6000 |
| 7000 | 8000 |
US BURNER | 44/55 | 44/55 |
| 45/56 |
| 45/56 | 46/57 |
| 47/58 | 47/58 |
ORIFICE |
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CANADA BURNER | 44/55 |
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ORIFICE |
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Tabled data is based upon the furnace input being reduced for altitudes above sea level. U.S. 4% per 1,000 feet. Canada 10% derate for
High altitude kits are purchased according to the installa- tion altitude and usage of either natural or propane gas. Refer to the chart above for a tabular listing of appropriate altitude ranges and corresponding manufacturer’s high altitude Natu- ral Gas and Propane Gas kits. For a tabular listing of appro- priate altitude ranges and corresponding manufacturer's High Altitude Pressure Switch kits, refer to either the Pressure Switch Trip Points & Usage Chart in this manual or the Ac- cessory Charts in Service Instructions.
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