1. Set the Controller’s Enable/Disable switch to Disable.
2. Depending on the model, remove the side and/or front panels to gain access to the Blower
Proof Switch (see Figures above for location).
3. Use a Phillips head screw drive to remove the front cover from the switch to reveal the
switch setting indicator dial (0.3 in the Figure below).
COVER WITH LABEL COVER REMOVED
Figure 5-7: Blower Proof Switch
4. Set the Controller’s Enable/Disable switch to Enable and wait for the boiler to go into the
Purge sequence.
5. After about 5 seconds, with air flowing into the combustion chamber, slowly turn the dial
clock-wise (to higher value) until the unit trips off with an Air Flow Fault During Purge
message. Optionally, you could attach a manometer and measure the setting at the trip
point.
6. After the boiler shuts down, reset the dial indicator to its original position, shown on the
switch cover label, then replace the switch cover.
7. Reset the boiler.
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