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Benchmark 2.0LN Dual-Fuel Low NOx Boiler
CHAPTER 6: SAFETY DEVICE TESTING
(b) The unit will then execute a standard ignition sequence and display WAIT
IGNITION RETRY.
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.
6.11 SSOV PROOF OF CLOSURE SWITCH
This test can be performed when the unit is set up to run on either natural gas or propane fuel.
Both the Natural Gas and Propane SSOVs contain proof of closure switches which are wired in
series.
1.
Set the unit's ON/OFF switch to the OFF position.
2.
Place the unit in Manual Mode and set the valve position to 34%.
3.
Refer to Figure 6-1 and locate the Natural Gas 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 restart 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 wire #148 on the SSOV and press the CLEAR button. The unit should restart.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Page 70 of 158
Operation and Maintenance Manual
GF-127
OMM-0052_0E
PR2: 04/22/13
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