15 … 68
14 … 68
Printed in German
y • Edition 02.14 • Nr
. 254 722
7.4.3 Operation with reduced pre-
aeration time
Under specific circumstances, the
MPA can be started with a reduced
pre-aeration time. For doing this, the
valve tightness test after a regular
switch-off (P41) must have been suc-
cessful.
Settings for the operation without re-
duced pre-aeration:
a) Pre-aeration time A (P60): desired
duration of the pre-aeration
b) Pre-aeration time B (P61): 0 (= is
never carried out)
The common pre-valve must be con-
nected to V1. The ignition gas valve
is connected to the output V2 of the
MPA and the main gas flame to the
freely configurable additional valve
output.
V1
V2
GDW
VPS
V Zusatz
Hauptgas
Zündgas
Setting for the operation with reduced
pre-aeration time:
a) Pre-aeration time A (P60): 0 or
pre-aeration time that is always
required
b) Pre-aeration time B (P61): desired
duration of pre-aeration if the
valve tightness test was NOT fin-
ished successfully. This duration
is ignored if the valve tightness
test was successful after the last
regular switch-off (duration 0)!
7.4.4 Operation with ignition gas
flame
Basically, the MPA can be used
for the operation with ignition gas
flame.
Attention!
There is only one input for flame
monitoring (ionisation).
Attention!
The additional valve output must be
configured according to the desired
behaviour, that means that the mo-
ment for opening (P50 and P52) and
closing (P51 and P53) must be de-
fined via the respective parameters.
It is useful to open the main gas valve
shortly after the state has switched to
the stabilisation time B. So the igni-
tion gas flame can be stabilised dur-
ing the stabilisation time A, then, after
the state has switched to the stabili-
sation time B, the fan power can be
increased and, with a delay of a few
seconds (P52), the main gas valve
can be opened (for ex. if 50% of the
typical duration time to reach the new
fan power has been elapsed).
7.5 Special setting options
7.5.1 Different types of the air
pressure detector monitoring
See section 8 "Parameter descrip-
tion" - P14.
7.5.2 Different types of the tem-
perature controller default or heat
request
See section 8 "Parameter descrip-
tion" - P15.
7.5.3 Different types of the modu-
lation degree default
See section 8.7 "Parameter descrip-
tion" - P72.
7.5.4 Waiting program with open
safety chain or lack of gas on the
GDWVPS
See section 7.5 State 36: "Waiting
program".
Ignition gas
Main gas
additional
