Watts AERCO Benchmark BMK750 Operation And Service Manual page 35

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 3 - START SEQUENCE
Start Sequence
TO BLOWER
AIR IN
Figure 3-2b: BMK1500 – 6000 Air/Fuel Valve In Purge Position
5. Next, the Blower Proof and Blocked Inlet switches close (Figure 3-4a and 3-4b). On the Ignition
Sequence screen the Purging indicator turns grey while purging is underway (Figure 3-3) and
Purge Timer displays the purge cycle's elapsed time in seconds.
Figure 3-3: Ignition Sequence Screen – Purging
Figure 3-4a: BMK750 & 1000 Blower Proof Switch
OMM-0145_A99 • GF-218 •
STEPPER
MOTOR
PURGE
VALVE POSITION
DIAL AT 100%
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
9/18/2019
BLOWER PROOF SWITCH
BLOCKED INLET SWITCH
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