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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 allowing
ignition trial. The switch is factory set and requires no
adjustment.
Capacity
Pressure
Switch Kit
As Shipped
045
(-0.65" w.c.)
As Shipped
070
(-0.68" w.c.)
As Shipped
090
(-0.65" w.c.)
As Shipped
110
(-0.68" w.c.)
As Shipped
135
(-0.65" w.c.)
Minimum allowable set points for this altitude range. Application of a Pressure Switch with lower set point (less negative / closer to zero) is not
1
permitted.
Kit contains burner orifices and gas valve regulator spring(s).
2
507330-03G / 31-5000662
Orifice Kits and Pressure Switch Kits at Various Altitudes
0 - 4500 ft.
Natural to LP /
Pressure
1
Propane Orifice
Switch Kit
Kit
(-0.60" w.c.)
(-0.60" w.c.)
11K50
2
(0.034")
(-0.60" w.c.)
(-0.65" w.c.)
(-0.60" w.c.)
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. See Table 15 for allowable
heating speeds. 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.
4501 - 7500 ft.
Natural to LP /
1
Propane Orifice
Kit
80W52
80W52
80W52
11K50
2
(0.034")
80W57
80W52
Table 14.
Issue 2209
7501 - 10000 ft.
Pressure
Natural Orifice
1
Switch Kit
Kit
80W51
(-0.55" w.c.)
80W51
(-0.55" w.c.)
80W51
51W01
(-0.55" w.c.)
(0.055")
80W52
(-0.60" w.c.)
80W51
(-0.55" w.c.)
LP / Propane
Orifice Kit
11K45
2
(0.032")
Page 29 of 36
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