507330-03G / 31-5000662
Issue 2209
Page 29 of 36
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.
Orifice Kits and Pressure Switch Kits at Various Altitudes
Capacity
0 - 4500 ft.
4501 - 7500 ft.
7501 - 10000 ft.
Pressure
1
Switch Kit
Natural to LP /
Propane Orifice
Kit
Pressure
1
Switch Kit
Natural to LP /
Propane Orifice
Kit
Pressure
1
Switch Kit
Natural Orifice
Kit
LP / Propane
Orifice Kit
045
As Shipped
(-0.65” w.c.)
11K50
2
(0.034”)
80W52
(-0.60” w.c.)
11K50
2
(0.034”)
80W51
(-0.55” w.c.)
51W01
(0.055”)
11K45
2
(0.032”)
070
As Shipped
(-0.68” w.c.)
80W52
(-0.60” w.c.)
80W51
(-0.55” w.c.)
090
As Shipped
(-0.65” w.c.)
80W52
(-0.60” w.c.)
80W51
(-0.55” w.c.)
110
As Shipped
(-0.68” w.c.)
80W57
(-0.65” w.c.)
80W52
(-0.60” w.c.)
135
As Shipped
(-0.65” w.c.)
80W52
(-0.60” w.c.)
80W51
(-0.55” w.c.)
1
Minimum allowable set points for this altitude range. Application of a Pressure Switch with lower set point (less negative / closer to zero) is not
permitted.
2
Kit contains burner orifices and gas valve regulator spring(s).
Table 14.
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.