Low/High Fire - FULTON VMP Series Installation, Operation And Maintenance Manual

Fulton Ltd
15. After the burner has been firing for approximately five minutes, adjust the main air control gate
located on the burner scroll, to obtain a clean combustion.
See typical combustion values given in Appendix A - TI 128.
16. Observe the flame through the observation glass and adjust the primary/secondary air control
located on the burner, so that the flame can be seen passing down the blast tube.
17. Check the operation of the low water safety controls (see Section 5.4.2 - Low Water Level
Check).
18. Adjust the steam pressure control to suit the boiler application (see Section 4.2.3 - Steam
Pressure Controls). It should be borne in mind that boilers are designed to operate most
efficiently at their maximum operating pressure. When boilers are to be operated below a
pressure of 80 psi (5.5 bar) consideration should be given to the fitting of a pressure reducing
set.
3.2 SETTING THE BURNER CONTROLS
LOw/HIGH FIrE
3.2.1
The correct setting for low fire/high fire operation is made by making adjustments to the two stage
solenoid valve and the low fire steam pressure switch.
1. Isolate the main gas valve by closing the valve in the gas input line.
2. Screw the pilot gas governor fully down (governor open).
3. Start the burner and where possible meter the pilot gas rate (ideally the pilot gas rate should
be 10% of the full gas rate).
4. Check the ignition and pilot stability several times.
Record the pilot gas pressure.
5. Open the main gas isolating valve.
6. Set the gas input to the boiler for correct input on high fire. This adjustment should be done
where possible by using the gas meter.
Adjust the main and secondary air gates to obtain optimum combustion conditions.
7. Adjust the low fire steam pressure switch to cut out at approximately 5 psi below the setting of
the main steam pressure control.
8. Adjust the two-stage solenoid valve to obtain a low fire gas input of approximately 80% of high
fire.
Leave the air gate adjustments as for high fire.
VMP-IOMM-2018-2
COMMISSIONING - 3
GAS BURNER
Page 27