AERCO BMK 2.0 LN Dual Fuel Nov 2010 - Manual (Page 129)

APPENDIX K
K-1
BENCHMARK 2.0LN DUAL-FUEL SWITCHOVER INSTRUCTIONS
Prior to operating a Benchmark 2.0LN Dual-Fuel Unit on either Natural Gas or Propane, a
number of checks and procedural steps must be performed prior to performing the initial start-up
and combustion calibration. These checks and procedures are:
• Set the Fuel Selector Switch to the proper position.
• Select the proper Fuel Type (Natural Gas or Propane)
• Open and close the appropriate 1/4” Ball Valves in the Natural Gas/Propane Gas Trains
Detailed instructions for performing these tasks are presented in the following Sections.
SWITCHOVER FROM NATURAL GAS TO PROPANE
To switch from Natural Gas to Propane operation, proceed as follows:
1. Refer to Figure K-1 and locate the Fuel Selector Switch on the unit, behind the front
door.
2. Set the Fuel Selector Switch to the PROPANE position. A Low Gas pressure Fault
message will be displayed on the Control Box.
3. Clear the Low Gas Pressure Fault by pressing the CLEAR key.
4. Apply AC power to the Benchmark 2.0LN Dual-Fuel Boiler
5. Press the MENU key once. Setup Menu will be displayed.
6. Press the ▲ arrow key once. Password will be displayed.
7. Press the CHANGE key. Password will begin to flash.
8. Using the ▲ arrow key, increment the display and stop at 159.
9. Press the ENTER key to store the displayed password.
10. Password 1 will be displayed, indicating that the valid Level 1 password has been
stored.
11. Next, access the Configuration Menu by pressing the MENU key once.
12. Using the ▲ and ▼ arrow keys, scroll through the Configuration Menu and stop at Fuel
Type .
13. Press the CHANGE key. The Fuel Type will begin to flash.
14. Press the ▲ arrow key and toggle the display to Propane.
15. Press the ENTER key to select Propane.
16. Finally, remove the top panel and front door from the boiler to access the Natural Gas
and Propane Gas Trains of the unit.
17. .Refer to Figure K-2 and locate the 1/4” Ball Valves on the downstream (outlet) side of
the Safety Shutoff Valves (SSOVs) for the Natural Gas and Propane Gas Trains. These
Ball Valves are used to turn on and turn off the gas flow between the Natural Gas
/Propane SSOV’s and the Staged Ignition Assembly of the unit.
18. Close the Natural Gas Ball Valve shown in the center-left portion of Figure K-2.
19. Open the Propane Ball Valve near the top portion of Figure K-2.
20. Replace the top panel and front door on the boiler.
21. This completes the steps necessary to switch from Natural Gas to Propane operation.