AERCO BMK 1.5 LN July 2011 - Manual (Page 66)

CHAPTER 6: SAFETY DEVICE TESTING
Page 66 of 152 PR2: 05/09/12
Benchmark 1.5LN Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0D
GF-120
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
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.
PARTIAL LEFT SIDE VIEW
BLOWER
PROOF
SWITCH
BLOCKED
INLET
SWITCH
AIR
INLET
AIR/FUEL
VALVE
SSOV
MANUAL
GAS
SHUTOFF
VALVE
Figure 6-3: Manual Gas Shut-Off Valve Location