AERCO BMK 2.0 LN Natural Gas (SN G-11-1861 and above) - Manual (Page 79)

GF-123
Benchmark 2.0LN Low NOx Boiler
Chapter 6
OMM-0046_0E I nstallation, Operation and Maintenance Manual Safety Device Tests
PR1 08/20/12 AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288 Page 79 of 170
4. The unit should perform one IGNITION RETRY cycle and then shut down, since the blower
is disabled. The unit will then display AIRFLOW FAULT DURING PURGE.
5. Re-enable the blower output drive voltage by performing the following steps:
(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 VALVE POSITION 0-10V is displayed, then press the
ENTER key.
6. Once the unit has proved flame, turn off the blower by going to the Configuration Menu,
Analog Output menu item and select OFF.
7. The Blower Proof Switch will open and the blower should stop. The unit should shut down
and display AIRFLOW FAULT DURING RUN.
8. Go to the Configuration Menu, Analog Output item and select VALVE POSITION 0-10v.
9. Press the CLEAR button. The unit should restart.
10. Next, check the Blocked Inlet Switch by first noting the current position of the Iris Air Damper
and then closing the Damper to position 8.
11. .The unit should shut down and again display AIRFLOW FAULT DURING RUN.
12. Return the Iris Air Damper to its previous setting.
13. Press the CLEAR button. The unit should restart.
6.9 SSOV PROOF OF CLOSURE SWITCH
The SSOV shown in Figure 6-1 contains the proof of closure switch. The proof of closure switch
circuit is checked as follows:
1. Set the unit’s ON/OFF switch to the OFF position.
2. Place the unit in Manual Mode and set the valve position between 25% and 30%
3. Refer to Figure 6-1 and locate the SSOV.
4. Remove the cover from the SSOV by loosening the screw shown in Figure 6-4. Lift off the
cover to access the terminal wiring connections.
5. Disconnect wire #148 from the SSOV to “open” the proof of closure switch circuit.
6. The unit should fault and display SSOV SWITCH OPEN.
7. Replace wire #148 and press the CLEAR button.
8. Set the ON/OFF switch to ON to start the unit.
9. Remove the wire again when the unit reaches the purge cycle and PURGING is displayed.
10. The unit should shut down and display SSOV FAULT DURING PURGE.
11. Replace the wire on the SSOV and press the CLEAR button. The unit should restart.