Benchmark 2500 - 3000 Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
Page
74
of
204
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0094_0E
03/20/2014
Ph.: 800-526-0288
GF-137
Figure 6-2b:
BMK 3000:
High Gas Pressure Fault Test
High Gas Pressure Test
1. Remove the 1/4“ plug from the leak detection ball valve shown in Figure 6-2b.
2. Install a 0 – 16” W.C. manometer (or W.C. gauge) where the 1/4” plug was removed.
3. Slowly open the leak detection ball valve.
4. Start the unit in Manual mode at a valve position (firing rate) 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.
6. Slowly increase the gas pressure using the adjustment screw on the SSOV (see Figure
4-3).
7. The unit should shut down and display a
HIGH GAS PRESSURE
fault message when
the gas pressure exceeds
2.6” W.C. for BMK 2500
and
3.5” W.C. for BMK 3000.
The
FAULT
indicator should also start flashing.
8. Reduce the gas pressure back to the value recorded in step 5. This pressure should be
within the range of
2.0” W.C., ± 0.2” W.C. for BMK 2500
and
2.3” W.C. ± 0.2” W.C. for
BMK 3000
.
9. Press the
CLEAR
button on the Control Box to clear the fault.
10. The fault message should clear and the
FAULT
indicator should go off. The unit should
restart.
11. 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)
