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ctioning when the gas pressure is not within the values spe-
cified. From the specific functions of the pressure switches,
it is evident that the pressure switch controls the minimum
pressure must make use of the contact, which is closed, when
it measures a pressure which exceeds that at which it has
been set. The maximum pressure switch must make use of
the contact, which is closed, when it measures a pressure be-
low that at which it has been set. The minimum and maximum
gas pressure switches should be regulated during the burner's
general inspection and should be in function with the pressure
found each time. Theintervention (by this we mean the ope-
ning of the circuit) of any one of the gas pressure switches,
will prevent the control box and thus the burner from starting
up. When the burner is operating (flame lit), the intervention of
the gas pressure switches (opening of the circuit) determines
the immediate arrest of the burner. During the burner's gene-
ral inspection, check the correct functioning of the pressure
switches. By operating the respective regulating device, it is
possible to control the pressure switch's intervention (opening
of circuit) which causes the burner's arrest.
14) Check the efficiency of the flame detector (ionisation electro-
de) by detaching the wire coming from the electrode and by
turning on the burner. The control box should carry out com-
pletely its cycle and two seconds after the ignition flame (pilot)
is formed, it should go to "shut down". This control should also
be carried out when the burner is already operating. By deta-
ching the wire that comes from the ionisation electrode, the
control box should go immediately to "shut down".
15) Check the efficiency of the boiler thermostats and pressure
switches (this should result in the burner coming to a stand-
still).
N.B. Check that that ignition takes place correctly because if the
mixer is forward it may happen that the speed of the delivery
air is so high that ignition becomes difficult. If this happens the
mixer must be moved back by degrees until it is in a position at
which ignition takes place normally, at which point this can be
taken as the final position.
We remind you that it is advisable, as regards the ignition flame,
to restrict the quantity of air to the minimum necessary for safe
ignition, even in the most difficult cases.
MANUAL MODE BURNER INSTRUCTIONS
Combustion control can be carried out over the whole modulation
range while manually controlling the MPA 22 equipment. For this
use modulation connector (B) in the diagram, which is provided
with the burner as standard. After disconnecting the 4-pole plug
(A) which takes the signals from the thermostat or the RWF 40
adjustor, insert the connector in position (B). Use the + button to
increase the gas and air supply or - to reduce it.
After the check, put the 4-pole plug (A) back in so as to reset au-
tomatic mode modulation.
IONISATION CURRENT MEASUREMENT
The current minimum for the working equipment is 1.4 µA.
The burner gives a clearly greater current which will not normally
require any controls. If, however, you wish to measure the ionisa-
tion current, you have to connect a milliammeter in series with the
ionisation electrode cable as shown in the diagram
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