Low Gas Pressure Fault Test - Benchmark BMK 1500 User Manual

6.2 LOW GAS PRESSURE FAULT TEST

To simulate a low gas pressure fault, refer to Figure 6-1a and perform the following steps:
MANUAL
SHUT-OFF
VALVE
Figure 6-1a: BMK 1500/2000: Low Gas Pressure 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: 4.4" 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.
Page 70 of 184
Benchmark 1500 - 2000 Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
HIGH GAS
PRESSURE
SWITCH
LOW GAS BALL VALVE
Low Gas Pressure Fault Test
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
NATURAL
GAS INLET
SSOV
LOW GAS
PRESSURE
SWITCH
1/4" NPT PLUG
And Ball Valve (install
manometer here for LOW
GAS PRESSURE FAULT
TEST
OMM-0097_0C
GF-142