AERCO BMK 6000 - Manual (Page 51)

Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 3 – OPERATION
OMM-0086_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 51 of 210
GF-133
Ph.: 800-526-0288
03/20/14
Figure 3-3: SSOV Location
3. With all required safety device switches closed, a purge cycle will be initiated and the
following events will occur:
a) The Blower relay energizes and turns on the blower.
b) The Air/Fuel Valve rotates to the full-open purge position and closes purge position
switch. The dial on the Air/Fuel Valve will read 100 (Figure 3-4) to indicate that it is
full-open (100%).
c) The VALVE POSITION bargraph will show 100%.
Figure 3-4: Air/Fuel Valve In Purge Position
STEPPER
MOTOR
TO BLOWER
100
AIR IN
DOWNSTREAM
SSOV WITH
POC SWITCH
TO AIR/FUEL
VALVE
GAS INLET
MANUAL SHUT-OFF VALVE
UPSTREAM
SSOV WITH POC &
AUX SWITCH