baltur BGN 250 P, Инструкция по использованию, Страница: 15 / 60

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0006081525_201112
fig. 8
ENGLISH
7) The air pressure switch has the purpose of preventing the
opening of the gas valves if the air pressure is not that envisaged.
The pressure switch must therefore be adjusted to intervene in
closing contact when the air pressure in the burner reaches
a sufficient value. If the air pressure switch does not detect a
pressure value 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 operation of the air pressure switch you
must, with burner on and in first stage, increase the adjustment
value until it is triggered and immediately “locks-out” the burner.
Release the burner by pushing the appropriate button (8) and
readjust the pressure switch to a sufficient level to detect the
existing air pressure during the pre-ventilation phase of the
1
st
stage.
8) The control pressure switches for the gas (minimum) have the
purpose of preventing burner operation when the pressure of
the gas is not that envisaged. The minimum pressure switch
must use the contact which is closed when the switch detects
a pressure value higher than the one to which it was adjusted.
The adjustment of the minimum pressure switch must therefore
be carried out when the burner is started up, in accordance with
the pressure that is found at the time. 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. At
first burner ignition it is essential to check that it works properly.
9) Check the triggering of the ionisation electrode by disconnecting
the jumper between terminals 30 and 31 on the printed circuit
board and start up the burner. The equipment must run through
its cycle completely and, three seconds after the ignition flame
has formed, “lock-out”. This test should also be performed
with the burner already lit. The equipment should shut down
immediately when the connector (16) is disconnected.
10) Check the efficiency of the boiler thermostats or pressure
switches (when triggered they must stop the burner).
!
Once the adjusting operations are completed, visually
check that the sheet on which the bearing acts has
a progressive profile. Using appropriate tools check
also that in the passage from the 1
st
to the 2
nd
stage
combustion parameters do not move too much away
from the optimal values.
11) The gas adjustment butterfly valve is factory set on the lever
position “1”. If it were necessary to reduce the adjustment range
(gas butterfly valve opening angle), place the joint to position
“2”.