control. For applications that operate
at high temperature, some insulation,
shielding and forced air circulation may
be necessary to keep the control ope-
rating properly.
Wiring
The module should be mounted close
enough to the burner to allow short
direct routing of the high voltage cable.
Use a suitable high voltage cable that
conforms to national standards such as
EN60335-1. The cable must not run in
continuous contact with a metal surfa-
ce or the spark voltage will be reduced.
The necessary connections between
the ignition control module and external
loads should be made using thermopla-
stic insulated wire with a minimum
rating of 105°C.
Disconnect power before making any
wiring connections to prevent electrical
shock or equipment damage.
Refer to the wiring diagram for detailed
information on the exact connectors.
The unit should be protected by an
external quick acting fuse of appropria-
te ratings to prevent problems due, for
example, to short circuit or faulty
loads.
Note that a common ground is requi-
red between the burner and the
ground terminal on the control module.
Only one wire must connect the modu-
le ground terminal to the appliance
common ground point.
The external loads and the burner
must be connected to the same com-
mon ground point.
High voltage and probe electrodes
should be mounted at the burner with
a spark gap set according to the elec-
trical specifications data.
Flame check
The minimum flame ionization current
is 0.5µA. For a stable flame detection
this current under normal conditions
should be higher than 1µA. To measu-
re the ionization current connect a DC
microammeter in series with the flame
detection probe.
If the flame current is insufficient,
check that the flame detection probe is
fully in the flame.
Note that the flame detection is affec-
ted by the polarity of the connection to
the main supply. For safety reasons,
the flame is detected only with the cor-
rect line polarity connected to the con-
trol. Otherwise the unit will go to
lockout at the end of the safety time,
even if the burner is lit.
With single probe unit, to check the
flame level measure the DC voltage
between the probe and the ground with
a flame present. Connect the positive
lead to the probe and the negative to
the ground. The voltage should be
greater (more negative) than -25V.
Note however that the input impedan-
ce of the suitable voltage meter must
be more than 100MΩ.
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