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Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
1.
The DEMAND LED status indicator will light.
2.
The unit checks to ensure that the Proof of Closure (POC) switch in the downstream
Safety Shut-Off Valve (SSOV) is closed. See Figure 3-3 for SSOV location.
TO AIR/FUEL
VALVE
MANUAL SHUT-
OFF VALVE
NATURAL
GAS SSOV
PROPANE
GAS SSOV
Figure 3-3: SSOV Locations (BMK 3000DF DBB Gas Train Pictured)
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%).
OMM-0099_0A
GF-145
CHAPTER 3 – OPERATION
OPTIONAL
VENTING
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
NATURAL
GAS INLET
PROPANE
GAS INLET
Page 47 of 234
PR1: 05/21/2014
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