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GF-127
OMM-0052_0E
6.4 NATURAL GAS HIGH GAS PRESSURE TEST
To simulate a natural gas high gas pressure fault, refer to Figure 6-1 and proceed as follows:
1.
Ensure that the Fuel Selector Switch (Figure 6-2) is set to the NATURAL GAS position.
2.
Remove the 1/4" plug from the leak detection ball valve shown in Figure 6-1.
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 of 34%.
6.
Slowly increase the gas pressure using the regulator adjustment screw on the natural gas
SSOV.
7.
The unit should shut down and display a HIGH GAS PRESSURE fault message when the
gas pressure exceeds 10.5" W.C. The FAULT indicator should also start flashing.
8.
Reduce the gas pressure back to 7.3" 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 leak detect-ion ball valve and remove the manometer.
Replace the 1/4" plug removed in step 2.
6.5 PROPANE HIGH GAS PRESSURE TEST
To simulate a propane high gas pressure fault, refer to Figure 6-1 and proceed as follows:
1.
Ensure that the Fuel Selector Switch (Figure 6-2) is set to the PROPANE position.
2.
Remove the 1/4" plug from the leak detection ball valve shown in the upper portion of
Figure 6-1.
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 of 34%.
6.
Slowly increase the propane gas pressure using the regulator adjustment screw on the
propane SSOV.
7.
The unit should shut down and display a HIGH GAS PRESSURE fault message when the
gas pressure exceeds 3.5" W.C. The FAULT indicator should also start flashing.
8.
Reduce the gas pressure back to 2.8" 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.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
PR2: 04/22/13
Benchmark 2.0LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
CHAPTER 6: SAFETY DEVICE TESTING
Page 65 of 158
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