Siemens Synco 700 Series Basic Documentation page 87

Switch-off command via
output balance
Building Technologies
HVAC Products
Main menu > Commissioning > Settings > ... or
Main menu > Settings > Boiler sequence manager > Control parameters
Operating line
Downward sequence integral
The switching off of a boiler can be impacted by the switch-off integral.
A small switch-off integral means that removal of a boiler from the boiler sequence is
fast.
°C
TempMnFlow
53
50
TempSeqSwitchDiff
47
44
41
TempFlowWDem Flow temperature setpoint for performing the integral
TempSeqSwitchDiff Neutral zone (3 K)
TempMnFlow Main flow temperature
t Time
t switch off Time to elapse for boiler to be switched on
Switching off via the output balance prevents a large number of boilers from operating
at low output although heat demand could be covered by a smaller number of boilers.
Main menu > Commissioning > Settings > ... or
Main menu > Settings > Boiler sequence manager > Control parameters
Operating line
Downward sequence output limit
If several boilers maintain simultaneously the same setpoint – e.g. in the case of modu-
lating or 2-stage burners where the individual setpoint boost is set to 0 K or to a very
small value – the output balance is added as a second switch-off criterion.
For 20 minutes, the average boiler output of the boilers in operation must be smaller
than the downward sequence output limit. Also, to ensure that sufficient amounts of
heat can be delivered after boilers have been switched off, it is checked whether the
calculated required output of the boilers remaining in operation would amount to a
maximum of 95%.
Boiler sequence controller RMK770
6 Boiler sequence management
Range
0...500 K×min
b
TempFlowWDem
t
swiwtch off
Range
0...100%
Factory setting
50 K×min
t
Factory setting
--- %
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CE1P3132en
23.04.2009