elco Firebird FB 4 R LN, Instructions Manual

Page: 13 / 56

GENERAL
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EN
2 .5 Control box
The EBR-M4 control box, controls and monitors the forced draught burner. The microprocessor-
controlled program sequence ensures maximum stability of time periods, regardless of fluctuations
in the power supply or ambient temperature.
The design of the control box protects it from the effects of flame outs. Whenever the supply
voltage drops below its rated minimum level (170 ± 8 V), the control box shuts down - even in the
absence of a fault signal.
The control box switches itself back on again once the voltage has exceeded the 190 ± 8 V.
2 .6 Operating logic (Two-pipe system)
M
M1
118
103
101
120
T1
104
102
106
105
Y1
M1 Burner motor
T1 Ignition transformer
Y1 Solenoid valve
101 Fan
102 Oil pump
103 Air flap
104 Oil pressure regulator
105 Flexible oil pipe
106 Filter
118 Nozzle
120 Pre Heater
Fig. 5
2 .6 .1 Operating function
–
If heat is requested by the heating controls, the control box starts the program sequence.
–
The motor starts, the ignition transformer is switched on and the preventilation period of 15 s
commences.
–
The pre heater heats the oil in the oil line.
–
During the preventilation period, the furnace is monitored for flame signals.
–
At the end of the preventilation period, the fuel-oil solenoid valve opens and the burner starts.
–
The ignition transformer remains switched off while the burner is in operation.