Atmos
Heating Systems
Installation and user manual EN_FMT
27
8.10. Fitting instructions for the safety valve
The safety valve must be
tightened with a torque of 10
Nm.
8.11. Malfunction code 'F' (flashing)
After three failed attempts in a row, the unit will lock (flashing
'F').
This can have very different causes:
•
no gas
•
no ignition
•
bad flame formation
•
bad ionisation current
8.11.1. Gas control will not open (no voltage)
(Careful !!! 210 VDC).
If the gas control is not
connected, the Manager will
see this at the beginning of the
heat demand as a malfunction
and therefore lock.
To measure the voltage on the
gas control, the gas control
must remain connected.
During the starting period, the
gas control is connected to a voltage of 210 VDC.
8.11.2. Gas control will not open (gas inlet pressure too
high)
The gas pressure in the gas
pipe before the gas control is
too high. The safety valves of
the gas control cannot open
with gas pressures of >60
mbar.
•
open the inlet pressure measurement nipple of the
gas control
•
connect the pressure meter
•
measure the gas pressure (10 - 50 mbar)
8.11.3. Gas control will not open (coils defective)
The electrical coils of the gas
control are burnt out and the
safety valves of the gas control
will therefore not open.
•
The two outermost contacts on the gas valve should
be measured for resistance
•
the value that the multimeter shows should be about
4.1 kOhm at ambient temperature.
8.11.4. Gas/air mixture is not correctly adjusted
see Chapter 4. : Adjustment full load and low load.
8.11.5. Check glow plug
The 230 volt glow plug is in order if the measured resistance
at room temperature is about 1.0 - 1.4 kOhm.
•
remove the connection of the glow plug (230 V)
•
connect a multimeter
•
measure the resistance
Replacing the glow plug
The glow plug is a resistance
through which current is fed.
As a result of the high
temperature of the glow plug,
the burner can be ignited. This
makes the glow plug a part that
wears. The average life of the
glow plug is estimated at 8
years, depending on the
number of starts and on the variation of the mains voltage.
•
remove plug from glow plug (230 V high voltage)
•
remove glow plug from cover of unit
•
replace glow plug
8.11.6. Check ionisation current
Direct measurement of the
ionisation current using a
multimeter (
µ
A DC).
When the unit burns on
chimney sweeper function, the
ionisation current can be read
directly on the display.
•
Ionisation current in full load is correct between 6
µ
A
DC to 13
µ
A DC.
•
Ionisation current in low load is right 3
µ
A DC to 13
µ
A DC.
Insulating layer
With high temperature flame,
an insulating layer can be
formed on the probe. This
layer can be simply removed
with fine sandpaper. However,
coarse grooves in the surface
of the pin will accelerate new
formation of the layer.
