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5 Commissioning
5.1.8 Pre-purge Period
Select parameter no. 785
If an output channel is set to flue gas re-circulation, attention must still be given to P 427.
5.1.9 Recirculation Delay
Select parameter no. 427
Nr. FMS ETA Short Text Description Min Max Default
785 1 1 ZEIT VO Pre-purge time in seconds 0 999 30
Set the duration of pre-purge in this parameter.
The commissioning engineer sets this value.
P784 sets the lower limit of the pre-purge.
Nr. FMS ETA Short Text Description Min Max Default
427 1 1 VO Del R Number of points of air channel of recirc. (VMS)/delay
time (FMS)
0 999 750/10
Number of points of an air channel for recirculation
(VMS) / delay time (FMS) in seconds.
With VMS it is necessary to couple the recirculation flap
delay with an air channel during pre-purge. Therefore
an air channel is assigned to the recirculation flap (see
P 428). The opening of this air channel now determines
the moment, when the recirculation flap shall open. Set
in this parameter the number of digits the air channel
has to reach, before recirculation becomes active.
If the device is an ETAMATIC or a FMS, set the delay
time in seconds before the recirculation flap opens,
i. e. during this period only the boiler is ventilated.
The total pre-purge duration (P 785) has to be greater
than the value in this parameter.
- VMS opening of the air channel for delay of the
recirculation channel (in digit)
- FMS delay time (in seconds)
0 = recirculation channel remains closed during
pre-purge
1... = Delay/delay time of the recirculation channel
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