Dual Fuel Switchover; Over-Temperature Limit Switches - Watts AERCO Benchmark BMK5000 Operation And Service Manual

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 4 – INITIAL START-UP

4.7 DUAL FUEL SWITCHOVER

All Benchmark Dual Fuel models contain a fuel selector switch, located to the right of the I/O
board, behind the front panel.
I/O BOARD
and cover
Switchover from NATURAL GAS to PROPANE Instructions
1. Set the Edge Controller's Enable/Disable switch to Disable.
2. Close the external Natural Gas supply valve.
3. Open the external Propane gas supply valve.
4. Locate the Fuel Selector Switch (see Figure 4-10), behind the front door.
5. Set the Fuel Selector Switch from NAT GAS to PROPANE.
6. Replace the front door panel previously removed from the boiler.
Switchover from PROPANE to NATURAL GAS Instructions
1. Set the Edge Controller's Enable/Disable switch to Disable.
2. Close the external Propane Gas supply valve.
3. Open the external Natural Gas supply valve.
4. Locate the Fuel Selector Switch (see Figure 4-10), behind the front door.
5. Set the Fuel Selector Switch from PROPANE to NAT GAS.
6. Replace the front door panel previously removed from the boiler.

4.8 OVER-TEMPERATURE LIMIT SWITCHES

The unit contains two configurable over-temperature limit controls, positioned behind the unit's
front panel, under the Edge Controller:
•
Automatic Reset: If the unit's operating temperature exceeds the limit set on the switch,
the unit goes into an alarm mode and shuts the unit down. When the temperature falls
10 degrees below the limit, the unit automatically resumes operation without operator
OMM-0137_J •
12/20/2022
Figure 4-10: Dual Fuel Switch
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
FUEL SELECTOR
SWITCH
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