AERCO BMK 3.0 LN Dual Fuel 2007 - Manual (Page 119)

APPENDIX K
K-3
SWITCHOVER FROM PROPANE TO NATURAL GAS
To switch from Propane to Natural Gas operation, proceed as follows:
1. Refer to Figure K-1 and locate the Fuel Selector Switch on the front of the unit.
2. Set the Fuel Selector Switch to the NATURAL GAS 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. Refer to Figure K-1 and locate the Variable Frequency Drive (VFD) installed behind the
front panel door of the unit.
5. Install the VFD Logic Stick labeled “NATURAL GAS” in the slot on the front of the VFD.
6. Apply AC power to the Benchmark 3.0 Dual Fuel Boiler.
7. Press the MENU key once. Setup Menu will be displayed.
8. Press the ▲ arrow key once. Password will be displayed.
9. Press the CHANGE key. Password will begin to flash.
10. Using the ▲ arrow key, increment the display and stop at 159.
11. Press the ENTER key to store the displayed password.
12. Password 1 will be displayed, indicating that the valid Level 1 password has been
stored.
13. Next, access the Configuration Menu by pressing the MENU key once.
14. Using the ▲ and ▼ arrow keys, scroll through the Configuration Menu and stop at Max
Fire Rate.
15. Press the CHANGE key. The Max Fire Rate will begin to flash.
16. Press the ▲ arrow key and increase the Max Fire Rate to 100%.
17. Press the ENTER key to store the 100% Max Fire Rate.
18. This completes the steps necessary to switch from Natural Gas to Propane operation.