baltur TBG 55 Notice D'instructions page 33

switch does not detect pressure greater than that calibrated,
the equipment runs through its cycle but does not switch on
the ignition
transformer and does not open the gas valves and so the
burner "locks-out". To ensure correct working of the air pres-
sure switch you must, with burner on and with first flame
only, increase the regulation until it is triggered and immedia-
tely "locks-out" the burner. To release the burner, press the
release button and adjust the pressure switch to a sufficient
level to detect the existing air pressure during the preventi-
lation stage.
15) The control pressure switches for the gas (minimum)
are to prevent the working of the burner when the pressure
of the gas is not as provided for. It is clear from the specific
function of the pressure switches that the control pressure
switch for minimum pressure must make use of the contact
that is closed when the pressure switch detects a pressure
greater than that for which it is regulated. The adjustment of
the minimum gas pressure switch must therefore be carried
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out when the burner is started up, in accordance with the
pressure that is found at the time. The triggering (i.e. the
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opening of the circuit) of any of the pressure switches when
the burner is running (flame on) cause the burner to stop
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immediately. On first switching on of the burner it is essential
to check the correct working of the pressure switch.
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16) Check the triggering of the flame detector (ionisation
electrode) by disconnecting the jumper between terminals
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30 and 31 on the printed circuit board and switching on the
burner. The equipment must run through its cycle completely
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and, three seconds after the ignition flame has formed, "lock-
out". This check must also be carried out the burner alrea-
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dy on. Disconnecting the 30 and 31 jumper, the equipment
must immediately go into its "lock-out" action.
17) Check the proper working of the boiler thermostats or
pressure switches (when triggered they must stop the
burner).
N.B. Check that the switch on occurs normally since if the
adjuster is shifted forward, it may happen that the speed
of the delivery air is so high that ignition is difficult. If this
happens, the adjust must be shifted back by degrees
until it is in a position in which ignition occurs normally,
and this new position can be regarded as the final posi-
tion. We remind you that is preferable, in the case of the
small flame, to limit the quantity of air to the least pos-
sible needed for safe ignition, even in the most difficult
circumstances.
IONISATION CURRENT MEASUREMENT
To measure the ionisation current, remove the jumper
between terminals 30-31 on the printed circuit with the
burner off (see diagram). Connect a microampmeter to
the terminals (with a suitable scale to have the burner
restart). Once the flame has appeared it will be possible
to measure the ionisation current, the minimum value of
which to ensure the working of the equipment is shown in
the specific wiring diagram. After making the measurement,
reset the jumper that has been disconnected.
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