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Benchmark 2.0LN Dual-Fuel Low NOx Boiler
APPENDIX K: BMK 2.0 DUAL-FUEL SWITCHOVER INSTRUCTIONS
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.
Apply AC power to the Benchmark 1.5 Dual Fuel Boiler.
5.
Press the MENU key once. Setup Menu will be displayed.
Press the ▲ arrow key once. Password will be displayed.
6.
7.
Press the CHANGE key. Password will begin to flash.
Using the ▲ arrow key, increment the display and stop at 159.
8.
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 Max Valve
Position.
13. Press the CHANGE key. The Max Valve Position will begin to flash.
14. Press the ▲ arrow key and increase the Max Valve Position to 100%.
15. Press the ENTER key to store the 100% Max Valve Position.
16. Using the ▲ and ▼ arrow keys, scroll through the Configuration Menu and stop at Fuel
Type.
17. Press the CHANGE key. Fuel Type will begin to flash.
18. Press the ▼ arrow key. Natural Gas will be displayed.
19. Press the ENTER key to store the Natural Gas Fuel type.
20. Finally, remove the left side panel, top panel and front door from the boiler to access the
Natural Gas and Propane Gas Trains of the unit.
21. Figure K-3 shows a Dual-Fuel unit with a FM Gas Train containing one Natural Gas SSOV
and one Propane SSOV with regulators. If your unit contains an IRI Gas Train [also called a
Double Block and Bleed (DBB) Gas Train] it will contain two (2) Natural Gas SSOVs and two
(2) Propane SSOVs, one with a regulator and one without. For IRI (DBB) Gas Trains, the
downstream SSOV is the one containing the regulator.
22. For Natural Gas operation, refer to Figure K-3 and open the 1/4" ball valve for Natural Gas
operation.
23. Replace the front door and sheet metal panels previously removed from the boiler.
24. This completes the steps necessary to switch from Propane to Natural Gas operation.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Page 156 of 158
Operation and Maintenance Manual
GF-127
OMM-0052_0E
PR2: 04/22/13
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