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Model
Input Size
045
LP/Propane
070
LP/Propane
090
LP/Propane
110
LP/Propane
High Altitude Pressure Switch Kit
Model
Input Size
0-4500 ft
045
070
No
Change
090
110
NOTE - A natural to L.P. Propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit instal-
lation 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 require no adjustment.
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 de-
crease the temperature. See "TABLE 13" for allowable
heating speeds. Decrease the blower speed to increase
the temperature rise. Failure to adjust the temperature
rise may cause erratic limit operation.
Manifold Pressure Settings at all Altitudes
Gas
0 - 4500 ft.
Nat
3.5
10.0
Nat
3.5
10.0
Nat
3.5
10.0
Nat
3.5
10.0
Pressure Switch and Gas Conversion Kits at all Altitudes
4501-7500 ft 7501-10,000 ft
No Change
80W52
80W51
No Change
80W52
TABLE 11
4501 - 7500 ft .
7501 - 10,000 ft.
3.5
3.5
10.0
10.0
3.3
3.5
10.0
10.0
3.3
3.5
10.0
10.0
3.3
3.5
10.0
10.0
TABLE 12
High Altitude
Natural Gas to LP/Propane
Natural Gas
Burner Orifice Kit
7501- 10,000 ft
0 - 7500 ft
73W37
Fan Control
Ignition Control 103217-03
The heat fan-on time of 30 seconds is not adjustable. The
heat fan-off delay (amount of time that the blower oper-
ates 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 de-
lay affects comfort and is adjustable to satisfy individual
applications. Adjust 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 return air temperatures; shorter settings
provide higher return air temperatures. See Figure 24.
Ignition Control 107163-01
The heat fan-on time of 30 seconds is not adjustable The
heat fan-off delay (amount of time that the blower oper-
ates after the heat demand has been satisfied) may be
adjusted by changing the two position dip switch on the
integerated control, to one of four slections. Blower off de-
lay is factory set at 90 seconds. For other blower off delay
settings, please refer to the following chart:
Page 26
Line Pressure in. wg.
Min
4.5
11.0
4.5
11.0
4.5
11.0
4.5
11.0
Burner Orifice Kit
7501- 10,000 ft
11K49
11K44
Max
13.0
13.0
13.0
13.0
13.0
13.0
13.0
13.0
LP/Propane
Natural
to
Gas
Burner
Orifice Kit
0 - 7500 ft
73W81
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