ENGLISH
20 / 32
0006081530_201711
To ensure correct operation of the air pressure switch you must,
with burner on and in 1st stage, increase its regulation value until
the burner triggers and then it immediately “locks-out”.
To unblock the burner, press the special pushbutton and return the
pressure switch regulator to a sufficient value in order to measure
the air pressure existing during the pre-ventilation phase.
The gas pressure control switches (minimum and maximum)
prevent the burner from operating when gas pressure does not lie
between the expected range.
The minimum value pressure switch makes use of the NO
(normally open) contact which is closed when the pressure switch
detects a pressure higher than its own setting.
The maximum pressure switch makes use of the NC (normally
closed) contact which is closed when the pressure switch detects
a pressure lower than its own setting.
Adjustment of minimum and maximum pressure values on the
pressure switches must be performed when testing the burner, on
the basis of the pressure measured in each case.
The triggering (opening of the circuit) of any of the pressure
switches when the burner is running (flame on) causes the burner
to stop immediately.
The triggering (opening of the circuit) of any of the pressure
switches when the burner is running (flame on) causes the burner
to stop immediately.
When first switching on the burner it is essential to check that they
work properly.
Verify the flame detector operation as follows:
•
disconnect the wire coming from the ionisation electrode;
•
start the burner;
• the equipment will complete the control cycle and after two
seconds will lock out the burner due to the lack of ignition flame;
•
switch off the burner;
•
re-connect the wire to the ionisation electrode.
•
This test should also be conducted with the burner already
on; when extracting the photocell from its seat, the apparatus
should shut down immediately.
•
check the efficiency of the thermostats or boiler pressure
switches (they should shut down the burner when triggered)
CAUTION / WARNINGS
Check that the ignition takes place properly. In the event that
the mixer is too far forward, it may happen that the speed
of the delivery air is so high that ignition is difficult. If this
happens, the mixer must be gradually shifted back until it is
in a position in which ignition occurs normally, and this new
position can be regarded as the final position.We remind
you that is preferable, in the case of the small flame, to limit
the quantity of air to the lowest amount possible needed for
safe ignition, even in the most difficult circumstances.|bb|
IONISATION CURRENT MEASUREMENT
The maximum ionisation current value required for a correct
operation of the equipment is indicated in the wiring diagram.
The burner provides a significantly higher current and therefore
does not normally require any checks at all.
To measure ionisation current, connect a microammeter in series
with the ionisation electrode cable as shown in the figure.
Summary of Contents for TBG 85 ME
Page 2: ......
Page 31: ...ITALIANO 29 32 0006081530_201711 SCHEMI ELETTRICI...
Page 32: ...ITALIANO 30 32 0006081530_201711...
Page 33: ...ITALIANO 31 32 0006081530_201711...
Page 63: ...ENGLISH 29 32 0006081530_201711 WIRING DIAGRAMS...
Page 64: ...ENGLISH 30 32 0006081530_201711...
Page 65: ...ENGLISH 31 32 0006081530_201711...
Page 67: ......
