Air Pressure Switches
There are 3 different air pressure switches. None of
the switches are interchangeable.
1. Vent Switch -
Indicates increased vent pressure due
to blockage.
2. Differential Pressure Switch - Detects blockage in
combustion chamber. Indicates blower activation
3. Air Pressure Switch - Detects blower inlet blockage.
Each switch has a colored decal to help identify the
switch. See chart below for proper switch choice.
Vent Pressure SW
Diff. Pressure SW (264)
Diff. Pressure SW (404)
Air Pressure SW
Color
Yellow
Green
Blue
Red
Part Number
602331
602333
602353
602332
Activation
Pressure W.C.
0.90±.05
-2.0±.05
-1.0±.05
-0.80±.05
Default Position
Normally Close
Normally Open
Normally Open
Normally Close
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COMPONENTS