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> > > T e c h n i c a l S p e c i f i c a t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F o r m a t i o n T e c h n i q u e
F o r m a t i o n T e c h n i q u e
F o r m a t i o n T e c h n i q u e
F o r m a t i o n T e c h n i q u e
Regulation: general functions
The burner can be lit following two different procedures depending on the prior condition of the unit:
• If the boiler has been switched off:
On lighting after the electricity has been cut off (using the ON/OFF button or
by disconnecting the cable), the boiler tests the circulation of water in the circuit.
The procedure is as follows:
- first a pre-flush of the pump depending on temperature
- burner lights P = 90% of P. max and 3 seconds of stabilisation.
- the outgoing temperature must rise by at least 5K.
If not:
- the burner then goes to max. power for 15 seconds.
As soon as the 5K temperature rise is detected, the burner goes into
normal operation.
Otherwise the boiler cuts out indicating a fault (
flashing display
).
Note: This is the same display as for lack of water pressure.
This function is very useful to avoid overheating when the installation
has not been fully bled (particularly at commissioning).
• If the boiler is already switched on:
The principle is the same as case A, except the burner starts at about 60% of maximum power and looks for an increase of 2K instead
of 5K.
After the ignition phase, the regulator controls the burner in heating (reduction to Pmin) or hot water (the power is adjusted according
to the need).
• Temperature regulation:
After ignition, the burner then goes into reduced power for 1 to 5 minutes:
- 1 minute if heating requirements are high
- 5 minutes if the heating requirements are lower.
After this period the power is released to be used as required.
The reason for this forcing to minimum power is to favour condensation.
The burner turns off at the s2K.
Note: it is recommended to use a modulating thermostat rather than a time-
proportional one with this type of regulation to avoid interference.
TUV
VV
(ot/min)
Burner lights
P = 90% of P. max
3 seconds
Pump pre-run
DT < 5°C =>
P = 100% of P. max.
for 15 seconds max.
DT ≥ 5°C => OK
DT < 5°C =>
Flashing display
and made safe.
Normal
operation
DT ≥ 5°C => OK
Normal
operation
