AERCO BMK 6000 Dual Fuel - Manual (Page 63)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
OMM-0096_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 63 of 219
GF-141
Ph.: 800-526-0288
03/21/2014
The Benchmark 6000 boiler is combustion calibrated at the factory prior to shipping. The gas
pressure, measured at 100% fire rate (Air/Fuel Valve % open position) on the downstream side
of the SSOV, must be within the range of 7.9” W.C. ±0.4” W.C. 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 following procedure as outlined. This will keep readjustments to a
minimum and provide optimum performance.
Natural Gas Combustion Calibration
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 control panel ON/OFF switch to the OFF position
4. Turn on external AC power to the unit. The display will show loss of power and the time
and date.
5. 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 %. Also, the MANUAL LED
will light.
6. Adjust the air/fuel valve position to 0% by pressing the
▼ arrow key.
7. Ensure that the leak detection ball valve downstream of the SSOV is open and the
manometer is attached and functioning properly.
8. Set the ON/OFF switch to the ON position.
9. Change the valve position to 50%
using the ▲ arrow key. The unit should begin its start
sequence and fire.
10. Next, verify that the gas pressure downstream of the SSOV is set to 7.5” to 8.3” W.C. If
gas pressure adjustment is required, remove the brass hex nut on the SSOV actuator to
access the gas pressure adjustment screw (Figure 4-3). Make gas pressure adjustments
using a flat-tip screwdriver to obtain a gas pressure between 7.5” and 8.3” W.C.