Ecoflam MAX GAS 350 PR Serie Manual De Uso página 8

EN
Function
­ General safety functions
Description of functions
When the system is switched on for the
first time, after a power failure or safety
shutdown, after a lack of gas or after the
system has been out of operation for 24
hours, the pre-ventilation period of 24
seconds begins.
During pre­purge period:
- blower pressure is monitored
- the combustion chamber is monitored for
flame signals.
At the end of the pre­purge period:
- ignition is switched on.
- main and safety valve are opened.
- burner starts.
Monitoring
The flame is monitored by an ionisation
probe. The probe is insulated and
fitted to the gas head and is routed
through the flame disc into the flame
zone. The probe must not have any
electrical contact with earthed parts.
The burner switches to lock-out if a short
F6
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circuit occurs between the probe and
the burner earth.
During burner operation, an ionised
zone is produced in the gas flame
through which a rectified current flows
from the probe to the burner head.
Safety functions
- If no flame is produced when the burner
is started (gas release), the burner will be
switched off at the end of the safety
period, lasting no more than 3 seconds,
and the gas valve will close.
- If the flame goes out during operation,
the gas supply is interrupted within one
second and the control unit goes to block.
- If there is a lack of air during reventilation
or operation, a safety lock-out occours.
- If there is a lack of gas, the burner does
not begin operation or switches off.
A waiting time of 2 minutes follows. This is
followed by a further start attempt. If there
is still no gas pressure, a further waiting
time of 2 minutes follows. The waiting time
can only be reset by interrupting the
119 pBr Y13 104
119.2
power supply to the burner.
Waiting times: 3 x 2 min, then 1 hour.
In the event of controller shutdown
- Controller thermostat interrupts heat
request.
- Gas solenoid valves close.
- Flame goes out.
- Burner motor switches off.
- Burner is ready for operation.
Y12 F4 106 143
F4 Minimum gas pressure switch
F6 Air pressure switch
Y13 Solenoid valve
Y12 Solenoid valve
1 Thermally-triggered safety shut-off valve
(installation by installer)
104 Gas pressure regulator
106 Filter
108 Gas ball valve (installation by installer)
119pBr Measuring point for gas outlet pressure
143 Antivibration coupling (installation resident).
108 1
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