AERCO BMK 6000 Dual Fuel - Manual (Page 67)

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 67 of 219
GF-141
Ph.: 800-526-0288
03/21/2014
4.5 PROPANE GAS COMBUSTION CALIBRATION
Refer to section 4.6 for instructions on how to switch the BMK 6000 boiler fuel source from
Natural Gas to Propane Gas.
The Benchmark boiler is combustion calibrated and set for Natural Gas fuel at the factory prior to
shipping. The gas pressure must be within the range of 3.8” 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 type (Natural or Propane), 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.
PROPANE Gas Combustion Calibration
1. Open the water supply and return valves to the unit and ensure that the system pumps are
running.
2. Set the control panel ON/OFF switch to the OFF position
3. Turn on external ac power to the unit. The display will show loss of power and the time
and date.
4. 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.
5. Adjust the air/fuel valve position to 0% by pressing the ▼ arrow key.
6. Ensure that the leak detection ball valve downstream of the SSOV is open.
7. Set the ON/OFF switch to the ON position.
8. Change the valve position to 50%
using the ▲ arrow key. The unit should begin its start
sequence and fire.
9. Next, verify that the gas pressure downstream of the SSOV is set to 3.8” W.C. ± 0.4” 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 4-5). Make gas pressure adjustments
using a flat-tip screwdriver to obtain a gas pressure range of 3.8” W.C. ± 0.4” W.C.