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Start-up, calibration and operation of the burner
5
5.6
Operation sequence of the burner
Burner start-up
• 0s:
TL closed.
• 5s :
Start of electrical control box programme. Servomotor
starts: 130° rotation to right, until contact is made on
cam I (Fig. 7).
• 35s :
The air damper arrives to the MAX. output position.
The fan motor starts up.
Start of the pre-purging phase.
• 75s :
The servomotor rotates towards the left as far as the
angle set on cam III (Fig. 7) for the MIN output.
• 95s :
The air damper and the gas butterfly valve adopt the
MIN output position (with cam III Fig. 7 at 65°).
• 105s : Ignition electrode strikes a spark.
The safety valve VS opens, along with the adjustment
valve VR, quick opening. The flame is ignited at a low
output level, point A.
Delivery is then progressively increased, with the
valve VR opening slowly up to MIN. output, point B.
• 108s : The spark goes out.
• 115s : The starting cycle comes to an end.
STANDARD IGNITION
M
105
108
105
35
75
M AX
M
95
115
M I N
0
5
M AX
B
C
M I N
A
0
95
115
0 sec
In the 60Hz version, the timings are reduced of
20%.
WARNING
Steady state operation
Burner without the modulating operation kit
Once the start-up cycle is completed, the servomotor command
moves on to the TR that controls the pressure or the tempera-
ture in the boiler, point C.
(The electrical control box still continues to check the presence
of the flame and the correct position of the air and gas maximum
pressure switches).
• If the temperature is low, so the remote control TR is closed,
the burner progressively increases the output up to the MAX
value (tract C-D).
• If subsequently the temperature or pressure increases until
TR opens, the burner progressively decreases its output to the
135
E
D
F
MIN. value (section E-F). The sequence repeats endlessly.
• The burner locks out when the heat request is less than the
heat supplied by the burner at MIN. output, (section G-H. The
TL opens, and the servomotor returns to angle 0°. The air
damper closes completely to reduce heat losses to a mini-
mum.
Burner with modulating operation kit
See the handbook enclosed with the adjuster.
Ignition failure
If the burner does not switch on, there is a lockout within 3s of
the electrical supply reaching the gas valve.
It may be that the gas does not arrive at the combustion head
within the safety time of 3s.
In this case increase gas ignition delivery.
The arrival of the gas at the pipe coupling is shown on the
pressure gauge of Fig. 36.
M
M AX
M
M I N
0
5
G
H
0 sec
D3815
Fig. 33
5.7
Burner flame goes out during operation
If the flame should accidentally go out during operation, the
burner will lock out within 1s.
23
GB
108
105
108
105
108
35
75
108
95
108
D3816
Fig. 34
20133205
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