06/2016 - Art. Nr. 4200 1041 1103A 5
Operation
Operation
Safety function
F4 Minimum gas pressure switch
F4.1 Max. gas pressure switch (PED)
F6 Air pressure switch
Y12 Safety solenoid valve
Y13 Main solenoid valve
1 Safety valve* (to be installed by
the fitter)
2 Test burner with pushbutton valve
(PED)
103.1Gas throttle
106 Screen
108 Gas cut-out valve (to be installed
by the fitter)
119pBrGas pressure measuring point at
the valve outlet
119.1Gas pressure measuring point
upstream of the valves
119.2Air pressure measuring point
* CH note
In accordance with SSIGE instructions,
it is compulsory to install a gas safety
valve (mark 1) in the pipe.
* DE Note
In compliance with the reference layout
applicable to boiler rooms, sites with gas
furnaces must be fitted with a thermal
gas shut-off valve (1).
Function description
- Control thermostat requests heat.
- The control program of the control unit
starts if the air pressure switch contact
is in the rest position and the gas
pressure switch signals sufficient gas
pressure.
- Burner motor operational
- Pre-ventilation period of 54 s.
During the pre-ventilation time
- the air pressure is monitored
- a check is made for the presence of
any abnormal flame signals.
At the end of the pre-ventilation time
- the ignition is switched on
- the main and safety solenoid valves
are opened.
- burner start-up
Monitoring
The flame is monitored by an ionisation
probe. The probe is fitted with insulation
to the gas head and is routed through
the turbulator into the flame zone. The
probe must not have any electrical
contact with earthed parts. The burner
switches to malfunction if a short 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 tip.
The ionisation current must be at least
8 µA. Safety functions
- If no flame is produced when the
burner is started (gas release), the
burner is switched off at the end of the
safety time which lasts no more than
3 seconds and the gas valve closes.
- If the flame is lost during operation,
the gas supply is cut within a second.
A new start-up sequence is activated.
If the burner starts, the operating cycle
starts running. Otherwise a lockout
occurs.
- If there is an air failure during pre-
ventilation or operation, a lockout
occurs.
- If there is a gas failure, the burner
either stops or will not start. As soon
as sufficient gas pressure is available
again, the burner restarts.
During the regulator shutdown
- The control thermostat interrupts the
heating request.
- The gas valves close
- The flame goes out
- The blower motor stops
- The burner is ready for operation
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