Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 6 – SAFETY DEVICE TESTING
OMM-0082_0J
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
83
of
192
GF-130
Ph.: 800-526-0288
05/21/2014
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:
Flame Fault Tests
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 shut down after reaching the 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.
Figure 6-3: Bare Boiler – Partial View
SSOV
AIR FILTER
BLOCKED INLET VALVE
BLOWER PROOF SWITCH
AIR/FUEL VALVE
BLOWER
MANUAL SHUT-
OFF VALVE