MFC Series Boilers User Manual
CHAPTER 6 – MFC 3000 DUAL FUEL BURNER
P
OMM-0104_94
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
35
of
170
GF-146
Ph.: 800-526-0288
12/29/2015
WARNING!
•
Do not use any sealing products such as gaskets, sealing compound, or tape.
•
Be careful to avoid damaging the nozzle sealing seat.
•
The nozzles must be screwed into place tightly, but carefully.
•
The nozzle for low fire operation is the one lying beneath the firing electrodes.
•
Make sure that the electrodes are positioned as shown in Figure 6-7.
6.3 Flow Rate adjustment
The nozzle flow rate varies according to the fuel pressure on the nozzle return. The chart in
Figure 6-5 shows this relationship for type A4 return flow nozzles with a pump delivery pressure
of 290 PSI.
The horizontal axis in the chart represents the PSI Nozzle Return Pressure, and the vertical axis
the GPH Nozzle Flow Rate. The values indicated in the right side of Figure 6-5 refer to the data
printed on the nozzle.
With a pump delivery pressure of 290 PSI, the pressure on the nozzle return must not exceed
246.5 PSI.
The pressure difference between pump delivery and nozzle return must be at least 43.5 PSI.
With smaller pressure differences, the pressure on the nozzle return can be unstable.
Figure 6-5: Nozzle Pressure and Flow Rate Chart
The nozzle return pressure value is indicated by the pressure gauge (1) in Figure 6-6.
