AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 53)

CHAPTER 4: INITIAL START-UP
PR2: 05/09/12 Page 53 of 162
Benchmark 1.5LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0C
GF-121
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
8. Ensure that the Fuel Selector Switch (Figure 4-3) is in the PROPANE position.
9. Set the
ON/OFF switch to the ON position.
10. Access the control panel Configuration Menu and change the Max Valve Position to
70%. (Refer to Chapter 3, para. 3.3 for instructions on changing menu options).
11. Change the valve position to 29% using the ▲ arrow key. The unit should begin its
start sequence and fire.
12. Next, increase the valve position to 70%. Verify that the gas pressure downstream of
the Propane SSOV is 1” W.C. for both FM and IRI gas trains. If gas pressure
adjustment is required, refer to Figure 4-7 and remove the brass hex nut on the
Propane SSOV actuator containing the gas pressure regulator. (For IRI gas trains,
the regulator is on the downstream SSOV). Make gas regulator adjustments using a
flat-tip screwdriver to obtain 1” W.C.
Figure 4-7: Manometer Installation Location for Combustion Calibration
13. With the valve position at 70%, insert the combustion analyzer probe into the vent
probe port opening (Figure 4-2) and allow enough time for the combustion analyzer
to settle.
14. Compare the measured oxygen % level to the range shown below. Also, ensure that
the carbon monoxide (CO) and nitrogen oxide (NOx) readings do not exceed the
values shown.
Combustion Oxygen Level at 70% Valve Position
NATURAL
GAS SSOV
PROPANE
GAS SSOV
NATURAL
GAS INLET
PROPANE
GAS INLET
TO AIR/FUEL
VALVE
1/4” NPT PLUG (Install
Combustion Calibration
manometer here)
LEAK DETECTION
BALL VALVE
BRASS HEX HEAD
CAP. REMOVE TO
ACCESS PRPPANE
GAS PRESSURE
ADJUSTMENT