AERCO BMK 2000DF - Manual (Page 49)

Benchmark 1500DF - 2000DF Boilers
CHAPTER 3 – OPERATION
OMM-0098_0A AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 49 of 196
GF-144 Ph.: 800-526-0288 04/01/2014
Figure 3-3:
BMK 1500DF/2000DF:
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 (Figure 3-4) will read 100 to indicate that it is
full-open (100%).
NATURAL GAS
INLET
TO
AIR/FUEL
VALVE
MANUAL SHUT-
OFF VALVE
NATURAL GAS
LOW GAS PRESSURE
SWITCH
NATURAL GAS
HIGH GAS
PRESSURE SWITCH
PROPANE
SSOV
PROPANE
INLET
NATURAL GAS
SSOV
PROPANE
LOW GAS PRESSURE
SWITCH
PROPANE
HIGH GAS PRESSURE
SWITCH