Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 4:
INITIAL START-UP
OMM-0123_E
• GF-207 • 12/17/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
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of
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4.5 COMBUSTION CALIBRATION
The Benchmark boiler was combustion calibrated with either standard combustion (NO
x
emissions of
<20 ppm)
or Ultra-Low NO
x
(NO
x
<9 ppm
) at the factory prior to shipping,
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
x
, complete Section 4.5.1
•
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
.
BRASS HEX HEAD
(Remove to access
Gas Pressure
Adjustment Screw).
TAC SCREW
