AERCO BMK 1.5 LN October 2012 - Manual (Page 75)

CHAPTER 6
SAFETY DEVICE TESTING
PR1: 10/18//12 AERCO International Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288 Page 75 of 166
GF-120
OMM-0041 0E
Benchmark 1.5LN Low NOx Boiler
Installation, Operation and Maintenance Manual
Since the manual gas shutoff valve is still closed, the unit will fail the ignition retry 10.
sequence. Therefore, it will shut down and display FLAME LOSS DURING IGNITION
following the failed ignition retry cycle.
Open the valve previously closed in step 8. 11.
Press the CLEAR button. The unit should restart and fire. 12.
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.
Disable the blower output drive voltage as follows: 1.
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.
Start the unit in the Manual Mode at a valve position between 25% and 30%. 2.
The unit should shut down and execute an IGNITION RETRY cycle by performing the 3.
following steps:
a. The unit will execute a 30 second re-ignition delay and display WAIT RETRY
PAUSE.
b. The unit will then execute a standard ignition sequence and display WAIT IGNITION
RETRY.
The unit should perform one IGNITION RETRY cycle and then shut down, since the 4.
blower is disabled. The unit will then display AIRFLOW FAULT DURING PURGE.
Re-enable the blower output drive voltage by performing the following steps: 5.
a. Press the MENU key until CONFIGURATION 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 VALVE POSITION 0-10V is displayed, then press the
ENTER key.
Once the unit has proved flame, turn off the blower by going to the Configuration Menu, 6.
Analog Output menu item and select OFF.
The Blower Proof Switch will open and the blower should stop. The unit should shut 7.
down and display AIRFLOW FAULT DURING RUN.
Go to the Configuration Menu, Analog Output item and select VALVE POSITION 0-10v. 8.
Press the CLEAR button. The unit should restart. 9.
Next, check the Blocked Inlet Switch by first noting the current position of the Iris Air 10.
Damper and then closing the Damper to position 8.
.The unit should shut down and again display AIRFLOW FAULT DURING RUN. 11.
Return the Iris Air Damper to its previous setting. 12.
Press the CLEAR button. The unit should restart. 13.