AERCO BMK 2.0 LN Dual Fuel Serial G-11-2402 and UP - Manual (Page 64)

CHAPTER 6: SAFETY DEVICE TESTING
Page 64 of 160 PR2: 04/22/13
Benchmark 2.0LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0052_0E
GF-127
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Figure 6-1: Low & High Gas Pressure Testing
6.3 PROPANE LOW GAS PRESSURE FAULT TEST
Refer to Figure 6-1 and ensure that the leak detection ball valve located at the high gas
pressure switch is closed.
1. Ensure that the Fuel Selector Switch (Figure 6-2) is set to the PROPANE position.
2. Remove the 1/4“ plug from the ball valve at the propane low gas pressure switch shown in
the upper-left portion of Figure 6-1.
3. Install a 0 – 16 “ W.C. manometer or a W.C. gauge where the 1/4" plug was removed.
4. Slowly open the ball valve near the propane low gas pressure switch.
5. Place the unit in Manual Mode and adjust the valve position to 34%.
6. While the unit is firing, slowly close the external manual gas shut-off valve.
7. The unit should shut down and display a LOW GAS PRESSURE fault message at
approximately 8.5” W.C. The FAULT indicator should also start flashing.
8. Fully open the external manual gas shut-off valve and press the CLEAR button on the
Control Box.
9. The fault message should clear and the FAULT indicator should go off. The unit should
restart.
10. Upon test completion, close the ball valve and remove the manometer. Replace the 1/4“
plug removed in step 2.
NATURAL
GAS SSOV
1/4” PLUG & LEAK
DETECTION BALL VALVE
(Install manometer
here for High Gas Pressure
Tests)
PROPANE SSOV
PROPANE LOW
GAS PRESSURE
SWITCH
NATURAL GAS HIGH
GAS PRESSURE SWITCH
PROPANE GAS HIGH
GAS PRESSURE SWITCH
NATURAL
GAS LOW
GAS PRESSURE
SWITCH
1/4” PLUG
(Install manometer
here for Propane Low
Gas Pressure Test)
1/4” PLUG
(Install manometer
here for Natural
Gas Low Gas
Pressure Test)
PROPANE
INLET
NATURAL
GAS INLET
MANUAL GAS
SHUT-OFF VALVE