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The boiler is on standby awaiting a heat request.
A: Start-up instruction.
It is given by the RVA 47 regulator or the LGM it-
self with a d.h.w. request (display 6) or a heating
request (display 7).
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This time ends as soon as the ventilator motor
speed reaches the programmed load for preven-
tilation.
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This time ends as soon as the ignition load is rea-
ched.
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Appearance of the ignition arc prior to opening
the gas valve, which occurs at the start of
phase 35.
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A flame signal should be present (ionization cur-
rent > 2.8 µA) before the safety time has elapsed.
If this does not occur, another ignition attempt is
made.
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Burner operation following a domestic hot water
request (display 6) or a heating request
(display 7).
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The switch from the operating position to the
Standby position is referred to as "shut-down"
and occurs when the heat request disappears.
The gas valve closes and the residues are eva-
cuated by post-ventilation.
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Blocking time for test purpose (approx. 2 s).
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Required time to reach the programmed air flow
rate.
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The ventilator remains on during the post-ventila-
tion time.
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Compulsory switch from the shut-down position
to standby. This phase is also used to bring the
safety control box to the standby position after ex-
ceptional events such as a RESET.
Signal required
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Condition required to move on the next stage
Signal unacceptable
range of possible speeds
A
B
C
D
Display
9
0/1
2
3
4
5
6./7.
8
Phase number
60
61
10
30
31
32
33
34
35
36
37
40
50
51
52
53
Heating demand
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Flame signal
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Temp. limiting safety device
Gas valve
Ignition
PWM
Fan speed
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