MFC Series Boilers User Manual
CHAPTER 8 – MFC 4000/6000 DUAL FUEL BURNER
Page
92
of
170
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0104_94
12/29/2015
Ph.: 800-526-0288
GF-146
•
The burner shuts off when demand for heat is less than the heat supplied by the burner in
the MIN output.
•
The servomotor returns to the 0° angle limited by contact with cam 2. The air damper
closes completely to reduce thermal dispersion to a minimum.
Every time output is changed, the servomotor automatically modifies oil delivery (pressure
regulator) and air delivery (fan damper).
8.16 Firing Failure
If the burner does not fire, it goes into lock-out within 3 sec. of the opening of the light oil valve. If
the flame should go out for accidental reasons during operation, the burner will lock out in 1
second.
8.17 Final Checks with Boiler in Operation
Perform the operations in the left column, while the boiler is operating, and ensure the response
in the right column is the result.
FINAL CHECK PROCEDURE
DESIRED RESULT
Open the control limit operation.
Burner
Stops
Open the high limit operation.
Turn down maximum gas pressure switch knob to the minimum position.
Burner Stops
In Lockout
Turn up the air pressure switch knob to the maximum position.
Turn down the maximum oil pressure switch at minimum position.
Switch burner to OFF and disconnect the electrical power.
Burner Will
Not Start
Disconnect the minimum gas pressure switch.
Turn up the minimum low oil pressure switch to maximum position.
Cover the UV flame sensor.
Burner Stops In
Lockout Due To
Firing Failure
WARNING!
Ensure that all lockout and safety procedures concerning all controls and valves are strictly
observed.
