Blower Proof Switch Test - Watts Aerco Benchmark OMM-0124 Installation And Start-Up Manual

Natural gas, propane gas and dual fuel fired modulating & condensing boilers
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Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 5: SAFETY DEVICE TESTING

5.8.1 Blower Proof Switch Test

Complete the test below to check the operation of the Blower Proof switch shown in Figure 5-5.
Blower Proof Switch Test Instructions
1. Set the Controller's On/Off switch to Off.
2. 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
4. Set the Controller's On/Off switch to On 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.
OMM-0123_E • GF-207 • 12/17/2019
SETTING
INDICATOR
Figure 5-6: Blower Proof Switch
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
COVER REMOVED
Page 71 of 95

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