AERCO BMK 6000 Dual Fuel - Manual (Page 72)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
Page 72 of 219 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0096_0B
03/21/2014
Ph.: 800-526-0288
GF-141
Switchover from PROPANE to NATURAL GAS – Continued
2. Close the external Propane Gas supply valves.
3. Open the external Natural Gas supply valves.
4. Refer to Figure 4-6 and locate the Fuel Selector Switch on the front of the unit.
5. Set the Fuel Selector Switch to the NATURAL GAS position. A Gas pressure Fault
message will be displayed on the Control Box.
6. Clear the Gas Pressure Fault by pressing the CLEAR key.
7. Apply AC power to the boiler.
8. Press the MENU key once. Setup Menu will be displayed.
9.
Press the ▲ arrow key once. Password will be displayed.
10. Press the CHANGE key. Password will begin to flash.
11.
Using the ▲ arrow key, increment the display and stop at 159.
12. Press the ENTER key to store the displayed password.
13. Password 1 will be displayed, indicating that the valid Level 1 password has been stored.
14. Next, access the Configuration Menu by pressing the MENU key once.
15.
Using the ▲ and ▼ arrow keys, scroll through the Configuration Menu and stop at Fuel
Type.
16. Press the CHANGE key. Fuel Type will begin to flash.
17.
Press the ▼ arrow key. Natural Gas will be displayed.
18. Press the ENTER key to store the Natural Gas Fuel type.
19. Replace the front door panel previously removed from the boiler.
20. This completes the steps necessary to switch from Propane Gas to Natural Gas operation.
4.7 REASSEMBLY AFTER COMBUSTION CALIBRATION
Once the combustion calibration adjustments are properly set, the unit can be reassembled for
service operation.
Reassembly
1. Set the ON/OFF switch in the OFF position.
2. Disconnect AC power from the unit.
3. Shut off the gas supply to the unit.
4. Remove the manometer and barbed fittings and reinstall the NPT plug using a suitable
pipe thread compound.
5. Remove the combustion analyzer probe from the 1/4” vent hole in the exhaust manifold.
Replace the 1/8” NPT plug in the manifold.
6. Replace all previously removed sheet metal enclosures on the unit.
7. Repeat the instructions in sections 4.6.1 or 4.6.2 to select the fuel you want to use at the
beginning of operation.