20
TWO STAGE LIGHT OIL BURNERS
APPLIANCE SPECIFICATIONS
Extraneous light / advanced ignition
During the pre-ventilation and/or pre-starting phase there
shall be no flame signal. Should the signal be present, for
example for advanced ignition due to bad tightness of the
electrovalve, external lighting, short-circuit in the photo-
resistance or in the connecting cable, a breakdown in the
flame signal amplifier, and so on., when the pre-ventilation
and safety time has elapsed, the control-box brings the
burner to the emergency stop and cuts off fuel inflow even
during the safety time.
No flame
If there is no flame at the end of the safety time, the control-
box stops the burner immediately.
No flame during operation
If there is no flame during operation, the control-box cuts
off fuel and automatically repeats a new starting program:
once the “t4” time has elapsed, the starting program is
over.
Every safety stop of less than 1 second switches off voltage
to terminals 3 - 8 - 11: and to terminal 10, it is possible to
provide a remote signal of emergency stop. Resetting of
the control-box is possible after approx. 50 seconds of
emergency stop.
Program Legend
Control-box output signals
Input signals required
A’ Beginning of starting cycle for burners
with light-oil pre-heater “OH”
A Beginning of starting cycle for burner
without light-oil pre-heater
B Flame presence
C Normal operation
D Adjustment stop by “R”
tw Light-oil pre-heating time until operation consent
by contact “OW” (minimum thermostat)
t1 Pre-ventilation time
t3 Pre-starting time
t2 Safety time
t3n Post-starting time
t4 Time interval between flame presence and
connection of 2nd valve to terminal 5
1234567
1234567
Tension
Type
Safety at
Pre-ventilation
Pre-starting
Safety
Post-starting
Time
low voltage
time
Interval
V ~
t1
t3
t2max
t3n
BV1-BV2=t4
220/240
LOA 24.171B27
YES
13 s
13 s
10 s
15 s
15 s
