AERCO BMK 2.0 LN October 2012 - Manual (Page 80)

Chapter 6
Benchmark 2.0LN Low NOx Boiler
GF-123
Safety Device Tests Installation, Operation and Maintenance Manual OMM-0046_0F
Page 80 of 172 AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288 PR1 10/17/12
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.
SSOV
BLOWER
PROOF
SWITCH
BLOCKED
INLET
SWITCH
AIR
INLET
AIR/FUEL
VALVE
MANUAL
GAS SHUT-
OFF VALVE
PARTIAL LEFT SIDE VIEW
Figure 6-3: Manual Gas Shut-Off Valve Location
6.8 AIR FLOW FAULT TESTS
These tests check the operation of the Blower Proof Switch and Blocked Inlet Switch shown in
Figure 6-3.
1. Disable the blower output drive voltage as follows:
(a) Press the MENU key until CONFIGUR-ATION MENU is displayed.
(b)
Press the ▲ arrow key until the ANA-LOG OUTPUT function is displayed, then press
the CHANGE key.
(c)
Press the ▼ arrow key until OFF is displayed, then press the ENTER key.
2. Start the unit in the Manual Mode at a valve position between 25% and 30%.