AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 158)

APPENDIX K: BMK 1.5 DUAL-FUEL SWITCHOVER INSTRUCTIONS
Page 158 of 162 PR2: 05/09/12
Benchmark 1.5LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0C
GF-121
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
K.2 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.
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
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-2 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-2 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.