AERCO BMK 1500-2000 - Manual (Page 73)

Benchmark 1500 - 2000 Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
OMM-0097_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 73 of 188
GF-142
Ph.: 800-526-0288
6.3 HIGH GAS PRESSURE TEST
To simulate a high gas pressure fault, refer to Figure 6-1b and perform the following steps:
Figure 6-1b:
BMK 1500/2000: High Gas Pressure Fault Test
High Gas Pressure Test
1. Close the leak detection ball valve located at the high gas pressure switch (see Figure 6-
1b).
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. With the unit running, monitor the gas pressure on the manometer installed in step 2 and
record the gas pressure reading.
7. Slowly increase the gas pressure using the adjustment screw on the SSOV (see Figure
4-3).
8. The unit should shut down and display a HIGH GAS PRESSURE fault message when
the gas pressure exceeds 4.7” W.C. for both BMK 1500 and BMK 2000. The FAULT
indicator should also start flashing.
9. Reduce the gas pressure back to the value recorded in step 5. This pressure should be
within the range of 3.6” ± 0.2” W.C. for BMK 1500 and 3.9” ± 0.2” W.C. for BMK 2000.
10. Press the CLEAR button on the Control Box to clear the fault.
11. The fault message should clear and the FAULT indicator should go off. The unit should
restart.
12. Upon test completion, close the ball valve and remove the manometer. Replace the 1/4“
plug removed in step 1.
SSOV
TO
AIR/FUEL
VALVE
HIGH GAS
PRESSURE
SWITCH
LOW GAS
PRESSURE
SWITCH
MANUAL
SHUT-OFF
VALVE
HIGH GAS
BALL VALVE
NATURAL
GAS INLET
1/4” NPT PLUG and Ball Valve
(install manometer here for
HIGH GAS PRESSURE FAULT
TEST)