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Mode of operation of the flame safeguards when used for the supervision of 2 manually controlled burners
With this type of supervision, too, the burner can be
started only if the flame detector or flame simulation test
has been successful. This means that
neither
of the 2
flame safeguards may detect a flame signal during burner
off times. When the burner is started up, the detector test
will automatically be interrupted.
When pressing button «I», relay «d» is energized via
circuit path 4-5 of the flame relays, which is still closed,
thus switching on the ignition of both burners.
At the same time, fuel is released.
The duration of the start pulse given by pressing button
«I» should be limited by a time relay
– in the sense of a
safety time
.
If the flame is established on
both
burners - indicated by
the signal lamps at housing of flame safeguards
– relay
«d» is now maintained in its energized condition via
circuit path 3-7 of the 2 flame relays.
When releasing button «I», ignition will be switched off,
thus completing the startup sequence.
If the event of loss of flame on
1
of the burners, the
respective flame relay is deenergized, thereby
neutralizing the holding circuit for relay «d». This means
that the fuel valves of
both
burners will immediately be
shut.
The burners are switched off manually be pressing button
«0», or
– automatically – by the control / limit thermostat
or pressurestat / pressure switch in the phase wire
connection.
In case of flame supervision with ionization probes,
terminal 6 of the flame safeguards must be connected
directly to the phase wire since no detector test is
required here.
Example: During connection with terminal 1!
Note!
Ensure that the drop out delay time of relay «d» does not exceed 50 ms (also refer to
«Connection
examples», 7781a02).
Caution!
An ignited UV tube is a source of UV radiation!
In case of flame supervision by
means of flame detectors, the detectors must be placed such that there is
no
direct
visual contact
between them. If this is not observed, there is a risk of loss
of safety
functions
11/15
Building Technologies Division
CC1N7781en
01.08.2016
