High Gas Pressure Test - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL

6.3 HIGH GAS PRESSURE TEST

To simulate a high gas pressure fault, refer to Figure 6-1b and perform the following steps:
SSOV
1/4" NTP PLUG
(Install manometer here for
HIGH Gas Pressure Test)
1. Close the leak detection ball valve located at the High Gas Pressure switch.
2. Remove the 1/4" NPT plug from the High Gas pressure leak detection ball valve shown in
Figure 6-1b.
3. Install a 0 - 16" W.C. (0 – 4.0 kPa) manometer or 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.
8. The FAULT indicator should start flashing and the unit should shut down and display a
GAS PRESSURE fault message at approximately 4.7" W.C. (1.17 kPa).
9. Reduce the gas pressure back to the value recorded in step 6. This pressure should be
within the range of 2.0" W.C. ± 0.4" W.C. (498 ± 100 Pa).
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"
NPT plug removed in step 2.
OMM-0119_0A
GF-130-I
CHAPTER 6 – SAFETY DEVICE TESTING
TO AIR/FUEL
VALVE
Figure 6-1b: High Gas Pressure Fault Test
High Gas Pressure Test
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
MANUAL SHUT-OFF
VALVE
HIGH GAS PRESSURE SWITCH
HIGH GAS PRESSURE
LEAK DETECTION BALL VALVE
LOW GAS PRESSURE SWITCH
LOW GAS PRESSURE
LEAK DETECTION BALL VALVE
(shown open)
GAS INLET
Page 73 of 170
11/03/2016