Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 4 – INITIAL START-UP
OMM-0121_D • GF-205 • 5/9/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 62 of 122
4.4 COMBUSTION CALIBRATION
The Benchmark boiler is combustion calibrated with either standard combustion or Ultra-Low
NO
x
(on the BMK 750 - 2000 only) at the factory, whichever was ordered, prior to shipping. This
gas pressure must be within the ranges shown in Table 4-1 for each model of boiler at full fire.
Recalibration as part of initial start-up is necessary due to changes in the local altitude, gas BTU
content, gas supply piping and supply regulators. Combustion Calibration Test Data sheets are
shipped with each unit. These sheets must be filled out and returned to AERCO for proper
Warranty Validation.
IT IS IMPORTANT TO PERFORM THE COMBUSTION CALIBRATION PROCEDURE BELOW
TO PROVIDE OPTIMUM PERFORMANCE AND KEEP READJUSTMENTS TO A MINIMUM.
• For units running on NATURAL GAS, standard & Ultra-Low NO
x
, complete Section 4.4.1
• For units running on PROPANE gas complete Section 4.4.2
Figure 4-3: Gas Pressure Adjustment Screw Location
Figure 4-4: TAC Screw
(Remove to access
Gas Pressure
Adjustment Screw).
TAC SCREW
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