Page. 13 of 73
Training manual :PIGMA Gal Evo
Burner ignition
Flame detection
Ignitor and gas valve
powered
popoweredpopwerede
ntés
When pressure switch contact is set to closure, the
gas valve and the igniters are power supplied.
A permanent check of flow rate is developed with the
aid of 2 primary sensors (Forward & Return).
Flow rate Control
Gas valve is fed by the ignition power (adjustable by
parameter
2 20
).
Flame detection is obtained by the ionization
electrode. In the event that the ionization sensor does
not sense any current during the ignition phase (8
seconds maximum), the boiler turns into safety state
and code symbol
5 01
is displayed on the screen.
Model FF only: a functional test of extractor is
performed by use of air pressure switch. If no signal is
detected after 20 seconds, the boiler turns to stand-by,
and code symbol
6 P1
is displayed on the screen.
Testing air pressure
switch
Flame detection enables the gas valve and the
extractor to carry out modulation of flame intensity
according to heat request.
Heating system output is adjustable by parameter
2
31
in operating ranges
Minimum output can be controlled directly by acting
on the gas valve.
Burner flame turn-off will take place at the following
T° values:
In the 1st min after flame detection:
T°off = set point T° +
8°
C
In the 2nd min after flame detection
T°off = T° set point T°
+ 6°C
After the 3rd min after flame detection:
T°off = set point T°
+ 4°C
This logic of operation allows to avoid possible
occurrence of delayed ignitions and extinctions by
the burner.
Modulation of burner
flame
Overheat Control
Overheat control is provided through a thermostat
(102±4°C) located at the outlet of the primary heat
exchanger. Resetting to be effected manually from the
control panel.
Default
1 01
is shown on screen. Reset possible when
temperature reads 87°C.
Notice.
Primary start sensor (NTC1) is to control that primary temperature may not exceed set value
88°C; in this occurrence, the sensor interdicts the burner to start ignition.
If flow circulation in the heating sytem is not sufficient to fulfill the purpose, an automatic by-pass valve
can open (maximum capacity = 350 l/h).
