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Troubleshooting guide

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APPENDIX K
K-1
BENCHMARK 3.0 DUAL-FUEL
SWITCHOVER INSTRUCTIONS
Prior to operating a Benchmark 3.0 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
• Installing the proper LogicStick in the Variable Frequency Drive (VFD)
• Adjusting the Max Fire Rate setting in the Configuration Menu of the C-More Control Box
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 front of the unit.
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. 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 “PROPANE” in the slot on the front of the VFD.
6. Set the ON/OFF switch on the C-More /control Box to the ON position.
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 decrease the Max Fire Rate to 75%.
17. Press the ENTER key to store the 75% Max Fire Rate.
18. This completes the steps necessary to switch from Natural Gas to Propane operation.