Flame Fault Tests - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL

6.7 FLAME FAULT TESTS

Flame faults can occur during ignition or while the unit is already running. To simulate each of
these fault conditions, proceed as follows:
1. Set the ON/OFF switch to the OFF position.
2. Place the unit in the MANUAL mode and set the valve position between 25% and 30%.
3. Close the manual gas shutoff valve located between the Safety Shut-Off Valve (SSOV)
and the Air/Fuel Valve (see Figure 6-3).
4.
Set the ON/OFF switch to the ON position to start the unit.
5.
The unit should purge and light the Pilot Flame, then it should shut down after reaching
the main burner ignition cycle and display FLAME LOSS DURING IGN.
6.
Open the valve previously closed in step 3 and press the CLEAR button.
7. Restart the unit and allow it to prove flame.
8. Once flame is proven, close the manual gas valve located between the SSOV (Figure 6-
3) and the Air/Fuel Valve.
9. The unit should shut down and execute an IGNITION RETRY cycle by performing the
following steps:
a) The unit will execute a shutdown purge cycle for a period of 15 seconds and display
WAIT FAULT PURGE.
b) The unit will execute a 30 second re-ignition delay and display WAIT RETRY
PAUSE.
c) The unit will then execute a standard ignition sequence and display WAIT IGNITION
RETRY.
10. Since the manual gas shutoff valve is still closed, the unit will fail the ignition retry
sequence. Therefore, it will shut down and display FLAME LOSS DURING IGNITION
following the failed IGNITION RETRY cycle.
11. Open the valve previously closed in step 8.
12. Press the CLEAR button. The unit should restart and fire.
OMM-0119_0A
GF-130-I
CHAPTER 6 – SAFETY DEVICE TESTING
Flame Fault Tests
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
Page 77 of 170
11/03/2016