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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 4 – INITIAL START-UP
4.5 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.
This concludes reassembly of the unit after combustion calibration.
4.6 DUAL FUEL SWITCHOVER
Dual Fuel models contain a fuel selector switch, located on the Temperature Limit panel. The
location of this panel on BMK 1500 – 3000 units is shown in Figure 4-5, below; for the location
of this panel on BMK 750 and 1000 units see Figure 4-6a in Section 4.7.
Instructions for switching from one fuel to the other are in Sections 4.6.1 and 4.6.2.
PARTIAL FRONT VIEW WITH FRONT COVER REMOVED
Figure 4-5: Dual Fuel Switch Location – BMK 1500-3000 Shown
OMM-0121_D • GF-205 • 5/9/2019
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FUEL SELECTOR
SWITCH
Page 71 of 122
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