Siemens AVS75.39 Series User Manual page 104

Restart lock
Switch-on delay
Forced time basic stage
Boiler sequence
Auto source seq ch'over
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The restart lock prevents re-switching on switched off heat generation. Is only
released after the timeframe expires. This prevents frequent cycling of the BMUs
and ensures that plant conditions will be more stable.
Correct adjustment of the switch-on delay ensures that plant operating conditions
will be stable. This prevents frequent cycling of the boiler.
With DHW requests, the delay time is fixed at one minute.
When switched on, each boiler operates with its basic stage for the period of time
set here. The next stage is released only when this period of time has elapsed.
Line no. Operating line
3540 Auto source seq ch'over
3541 Auto source seq exclusion
None ¦ First ¦ Last ¦ First and last
3544 Leading source
--- / 1..16
With automatic source sequence changeover, the boiler loads in a cascade can be
influenced by defining the order of lead and lag boilers.
Fixed order
The setting "- - -" provides a fixed sequence. The lead boiler can be selected using
line 3544, the remaining boilers are switched on or off in the sequence of the LPB
device address.
Order according to the number of operating hours
On completion of the number of hours set, the heat source sequence in the
cascade changes. It is always the heat source with the next higher device address
that takes on the role of lead heat source.
1st changeover 2nd changeover 3rd changeover 4th changeover
P [kW]
K 4 K 1
K 3 K 4
K 2 K 3
K 1 K 2
100
t = Total number of operating hours of all lead boilers [h]
P = Total output of the cascade [kW]
User manual RVS43.345
The settings in detail
K 2 K 3
K 1 K 2
K 1
K 4
K 3 K 4
200 300 400
Lag heat source
lead boiler
t [h]
CE1U2354en_021
2013-09-02