MFC Series Boilers User Manual
CHAPTER 10 – MFC 8000/10000 DUAL FUEL BURNER
Page
118
of
170
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0104_94
12/29/2015
Ph.: 800-526-0288
GF-146
CAUTION! Check Motor Rotation
As the burner is not fitted with a device to check the sequence of the phases, the motor rotation
may be incorrect. As soon as the burner starts up, go in front of the cooling fan of the fan motor
and check it is rotating anticlockwise. See Figure 10-13.
If this is not the case:
10. Place the On/Off switch in the
“OFF”
position and wait for the control box to carry out
the switch-off phase;
11. Disconnect the electrical supply from the burner;
12. Invert the phases on the three-phase power supply.
Combustion Air Adjustment
10.16.1
Fuel/combustion air must be synchronized with the relevant servo-motors (air and gas) by
storing a setting curve by means of the electronic cam.
To reduce pressure loss and to have a wider adjustment range, it is best to set the servomotor
to the maximum output used, as near to maximum opening (90°) as possible.
On the gas butterfly valve, the fuel’s partial setting adjustment based on required output, with
the servomotor fully open, is made by using the pressure stabilizer on the gas train.
Air Adjustment for Maximum Output
10.16.2
Set the servomotor to maximum opening (near 90°) so that the air butterfly valves are fully
open.
NOTE:
To achieve the maximum output required manually, it is suggested to adjust intake to the partial
setting, define gas pressure, and adjust the combustion head before completing the setting and
storing the fuel/combustion air synchronization curves.
Gas/Air Delivery Adjustment
10.16.3
Adjusting Gas/Air Delivery
1. Slowly open butterfly gas valve to maximum open position.
2. Adjust the required maximum output with the gas pressure stabilizer.
3. Adjust the combustion parameters with the air servomotor and store the maximum
combustion point.
4. Complete the procedure by synchronizing the combustion with the two servomotors and
storing the different setting points.
