AERCO BMK 6000 - Manual (Page 79)

Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 6 – SAFETY DEVICE TESTING
OMM-0086_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 79 of 210
GF-133
Ph.: 800-526-0288
03/20/14
Low Gas Pressure Fault Test – Continued
9. Upon test completion, close the external ball valve to shut down the unit. Remove the
manometer and NPT-to-barbed fitting. Replace the 1/4“ plug removed in step 1.
6.3 HIGH GAS PRESSURE FAULT TEST
To simulate a high gas pressure fault, refer to Figure 6-1B and perform the following steps:
Figure 6-1B: High Gas Pressure Test
High Gas Pressure Fault Test
1. Remove the 1/4“ plug from the ball valve shown in Figure 6-1B.
2. Install a NPT-to-barbed fitting and a 0 – 16” W.C. manometer where the 1/4” plug was
removed. Open the ball valve at the High Gas Pressure switch.
3. Open the external gas supply ball valve upstream of the unit.
4. Start the unit in the Manual mode at a valve position (% open) between 25 and 30%.
5. With the unit running, monitor the gas pressure on the manometer installed in step 2 and
record the gas pressure reading.
TO AIR/FUEL
VALVE
GAS
INLET
DOWNSTREAM LOW
GAS PRESSURE
SWITCH (6.9” W.C.)
HIGH GAS
PRESSURE
SWITCH
(10.5” W.C.)
MANUAL SHUT-OFF VALVE
UPSTREAM LOW GAS
PRESSURE SWITCH (8.5” W.C.)
BALL VALVE WITH 1/4" NPT PLUG
(Install manometer here for High Gas Pressure test)