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Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 4: INITIAL START-UP
4.5 COMBUSTION CALIBRATION
The Benchmark boiler was combustion calibrated with either standard combustion (NO
emissions of <20 ppm) or Ultra-Low NO
depending on which was ordered.
However, 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 procedure below, as it will keep readjustments to a
minimum and provide optimum performance.
•
For units running on NATURAL GAS, standard & Ultra-Low NO
•
For units running on PROPANE gas complete Section 4.5.2
Figure 4-3: Gas Pressure Adjustment Screw and TAC Screw Location
4.5.1 NATURAL GAS Combustion Calibration
The instructions below apply only to units running on NATURAL GAS. Instructions for doing
combustion calibration on a unit running PROPANE appear in the next section, 4.5.2.
NATURAL GAS Combustion Calibration Instructions
1. Open the water supply and return valves to the unit and ensure that the system pumps are
running.
2. Open the NATURAL GAS supply valve to the unit and then slowly open the Pilot gas
valve.
3. Set the C-More Controller's ON/OFF switch to the OFF position.
4. Turn external AC power to the unit ON. The display will show a description of the unit and
then the time and date.
5. Press the MENU key on the front panel of the C-More and access the Setup menu, enter
the password 6817 and then press the ENTER key.
6. Set the unit to the MANUAL mode by pressing the AUTO/MAN key. A flashing Manual
Valve Position message will be displayed with the present position in % and the MANUAL
LED will light.
7. Adjust the air/fuel valve position to 0% by pressing the ▼ arrow key and then pressing
ENTER.
OMM-0123_E • GF-207 • 12/17/2019
x
BRASS HEX HEAD
(Remove to access
Gas Pressure
Adjustment Screw).
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
(NO
<9 ppm) at the factory prior to shipping,
x
x
TAC SCREW
, complete Section 4.5.1
Page 51 of 95
x
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