AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 69)

CHAPTER 6: SAFETY DEVICE TESTING
PR2: 05/09/12 Page 69 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
6.4 NATURAL GAS HIGH GAS PRESSURE FAULT TEST
To simulate a natural gas high gas pressure fault, refer to Figure 6-1b and proceed as
follows:
1. Ensure that the Fuel Selector Switch (Figure 4-3) is set to the NATURAL GAS
position.
2. Remove the 1/4“ plug from the leak detection ball valve shown in Figure 6-1B.
3. Install a 0 – 16” W.C. manometer (or W.C. gauge) where the 1/4” plug was removed.
4. Slowly open the leak detection ball valve
5. Start the unit in Manual mode at a valve position (firing rate) between 25 and 30%.
6. Slowly increase the gas pressure using the adjustment screw on the SSOV.
7. The unit should shut down and display a HIGH GAS PRESSURE fault message when
the gas pressure exceeds 4.7” W.C. The FAULT indicator should also start flashing.
8. Reduce the gas pressure back to 3.0” W.C.
9. Press the
CLEAR button on the Control Box to clear the fault.
10. The fault message should clear and the FAULT indicator should go off. The unit
should restart.
11. Upon test completion, close the ball valve and remove the manometer. Replace the
1/4“ plug removed in step 2.
Figure 6-1b: High Gas Pressure Testing
NATURAL
GAS SSOV
PROPANE
GAS SSOV
NATURAL
GAS INLET
PROPANE
GAS INLET
PROPANE GAS HIGH GAS
PRESSURE SWITCH
MANUAL
SHUT-OFF
VALVE
NATURAL GAS HIGH GAS
PRESSURE SWITCH
1/4” PLUG & BALL VALVE
(Install manometer here for
HIGH Pressure Tests)