TABLE 13
Manifold Pressure Settings at all Altitudes
Model | Gas | 0−2000 ft | 2001−4500 ft. | 4501−7500 ft | 7501 − 10,000 ft | Line Pressure in.wg. | ||
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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 14
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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| 0−4500 ft | 4501−7500 ft | 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 factory−set and re- quire no adjustment.
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 factory−set and requires no adjustment.
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 fan−on time of 30 seconds is not adjustable. The heat fan−off delay (amount of time that the blower operates after the heat demand has been satisfied) may be adjusted by changing the jumper position across the five pins on the integrated control. The unit is shipped with a factory fan−off delay setting of 90 seconds. The fan−off delay affects com- fort and is adjustable to satisfy individual applications. Ad- just the fan−off delay to achieve a supply air temperature between 90° and 110°F at the moment that the blower is de−energized. Longer off delay settings provide lower re- turn air temperatures; shorter settings provide higher re- turn air temperatures. See figure 36.
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