Reassembly; Dual Fuel Switchover - Watts Aerco Benchmark OMM-0124 Installation And Start-Up Manual

Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 4: INITIAL START-UP

4.6 REASSEMBLY

Once the combustion calibration adjustments are properly set, the unit can be reassembled for
service operation.
Reassembly Instructions
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
and then replace the 1/4" NPT plug in the vent hole.
6. Replace all previously removed sheet metal enclosures on the unit.

4.7 DUAL FUEL SWITCHOVER

Dual Fuel models contain a fuel selector switch, located on the Temperature Limit panel.
Instructions for switching from one fuel to the other are in Sections 4.7.1 and 4.7.2.
OMM-0123_E • GF-207 • 12/17/2019
Figure 4-4: Dual Fuel Switch Location
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
DUAL FUEL
CUTOVER
SWITCH
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