baltur TBG 35 Instruction Manual For Installation, Use And Maintenance page 49

AIR PRESSURE SWITCH
The air pressure switch stops the equipment operation if air pressure
is not at the expected value.
The pressure switch must therefore be adjusted so that it is triggered
to close the NO (normally open) contact when the air pressure in the
burner reaches the set value.
If the air pressure switch does not detect a 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 the air pressure switch correct operation, with burner at
the minimum output, increase the adjustment value until reaching the
triggering value which must be followed by the immediate burner lock-
out.
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.
GAS CONTROL PRESSURE SWITCHES
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.
Adjustment of minimum and/or 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) locks out the burner 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;
• reposition the photocell;
• 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)
• At the end of the adjusting procedure, lock the nuts (1), (4) and (4a)
with wrench and counter wrench and turn off the burner.
• It is recommended to set the cam for closing the air damper when
inactive in a position that guarantees its complete closing when the
burner is off.
CAUTION / WARNINGS
Check that the ignition takes place properly. If the mixer is too
far forward, the high air flow can make ignition difficult. If this
happens, the mixer must be gradually shifted back until it is in a
position in which the best ignition is obtained. Fix this 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.
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ENGLISH