TABLE 10
Manifold Pressure Settings at all Altitudes
Model | Gas | 7501 - 10,000 ft | Line Pressure in.wg. | |||||
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Input Size |
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045 | Nat | 3.5 | 3.2 | 3.0 | 3.5 | 4.5 | 13.0 | |
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LP/propane | 10.0 | 10.0 | 10.0 | 10.0 | 11.0 | 13.0 | ||
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070 | Nat | 3.5 | 3.2 | 2.8 | 3.5 | 4.5 | 13.0 | |
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LP/propane | 10.0 | 10.0 | 10.0 | 10.0 | 11.0 | 13.0 | ||
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090 | Nat | 3.5 | 3.2 | 2.7 | 3.5 | 4.5 | 13.0 | |
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LP/propane | 10.0 | 10 | 9.6 | 10.0 | 11.0 | 13.0 | ||
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110 | Nat | 3.5 | 3.5 | 3.0 | 3.5 | 4.5 | 13.0 | |
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LP/propane | 10.0 | 10.0 | 9.6 | 10.0 | 11.0 | 13.0 | ||
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135 | Nat | 3.5 | 3.5 | 2.9 | 3.5 | 4.5 | 13.0 | |
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LP/propane | 10.0 | 10.0 | 9.6 | 10.0 | 11.0 | 13.0 | ||
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TABLE 11
Pressure Switch and Gas Conversion Kits at all Altitudes
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| High Altitude | Natural Gas to LP/Propane | LP/Propane to | ||
Model | High Altitude Pressure Switch Kit | Natural Gas Burner | Natural Gas Burner | |||||
Burner Orifice Kit | ||||||||
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| Orifice Kit | Orifice Kit | ||||
Input Size |
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| 7501 - 10,000 ft | 7501 - 10,000 ft | 0 - 7500 ft | 7501 - 10,000 ft | 0 - 7500 ft | |||
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045 |
| 80W52 | 80W51 |
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070 |
| 80W52 | 80W51 |
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090 | No Change | 80W52 | 80W51 | 73W37 | 70W89 | 76W15 | 73W81 | |
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110 |
| 80W57 | 80W52 |
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135 |
| 80W52 | 80W51 |
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NOTE - A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion procedure.
Other Unit Adjustments
Primary and Secondary Limits
The primary limit is located on the heating compartment vestibule panel. The secondary limits (if equipped) are lo cated in the blower compartment, attached to the back side of the blower. These auto reset limits are
Flame Rollout Switches
These manually reset switches are located on the burner box.
Pressure Switch
The pressure switch is located in the heating compartment adjacent to the combustion air inducer. The switch checks for proper combustion air inducer operation before allow ing ignition trial. The switch is
Temperature Rise
After the furnace has been started, and supply and return
air temperatures have been allowed to stabilize, check the temperature rise. If necessary, adjust the blower speed to maintain the temperature rise within the range shown on the unit nameplate. Increase the blower speed to decrease the temperature. Decrease the blower speed to increase the temperature rise. Failure to adjust the temperature rise may cause erratic limit operation.
Fan Control
The heat
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