AERCO BMK 1500-2000 - Manual (Page 72)

Benchmark 1500 - 2000 Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
Page 72 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0097_0D
Ph.: 800-526-0288
GF-142
6.2 LOW GAS PRESSURE FAULT TEST
To simulate a low gas pressure fault, refer to Figure 6-1a and perform the following steps:
Figure 6-1a:
BMK 1500/2000: Low Gas Pressure Test
Low Gas Pressure Fault Test
1. Close the leak detection ball valve located at the low gas pressure switch (see Figure 6-
1a).
2. Remove the 1/4“ plug from the ball valve at the low gas pressure switch shown in the
lower portion of Figure 6-1a.
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 low gas pressure switch.
5. Place the unit in Manual Mode and adjust the Air/Fuel Valve position (% open) between
25 and 30%.
6. While the unit is firing, slowly close the external manual gas shut-off valve.
7. The unit should shut down and display a GAS PRESSURE fault message at
approximately: 3.6” W.C. for both BMK 1500 and BMK 2000.
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 1.
NATURAL
GAS INLET
SSOV
HIGH GAS
PRESSURE
SWITCH
LOW GAS
PRESSURE
SWITCH MANUAL
SHUT-OFF
VALVE
1/4” NPT PLUG
And Ball Valve (install
manometer here for LOW
GAS PRESSURE FAULT
TEST
LOW GAS BALL VALVE