Operation Manual

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Siemens Schweiz AG User Manual CE1U2354en
HVAC Products Cascade 23. August 2007
1
st
changeover 2
nd
changeover 3
rd
changeover 4
th
changeover
K 1
K 2
K 3
K 4
K 2
K 3
K 4
K 1
K 3
K 4
K 1
K 2
K 4
K 1
K 2
K 3
t [h]
100
300
400200
P [kW]
2379Z07
Lag boiler
Lead boiler
t = Total number of operating hours of all lead boilers [h]
P = Total output of cascade [kW]
Setting automatic source sequence exclusion is only used in connection with the
activated heat source sequence (operating line 3540).
Using automatic source sequence exclusion, the first and / or the last boiler can be
exempted from automatic changeover.
None.
The order of switching on the boilers changes when the number of hours set is reached
(operating line 3540).
First
The first boiler in terms of addressing will always be the lead boiler. With the other
boilers, the order of switching on changes when the set number of hours is reached
(operating line 3540).
Last
The last boiler in terms of addressing will always be the last. The other boilers change
when the set number of hours is reached (operating line 3540).
First and last
The first boiler in terms of addressing will always be the lead boiler. The last boiler in
terms of addressing will always be the last. The boilers in between change when the
set number of hours is reached (operating line 3540).
The leading source is only selected in connection with the fixed order of the heat
source sequence (operating line 3540).
The boiler selected as the lead boiler is always the first to be switched on, or the last to
be switched off. The other boilers are switched on and off in the order of their device
addresses.
Minimum limitation of the return temperature
Line no. Operating line
3560 Return setpoint min
If the return temperature drops below the adjusted return setpoint, maintained boiler
return temperature becomes active..
Maintained boiler return temperature allows consumers to be influenced or a return
temperature controller to be used.
A
uto source seq exclusion
Leading source
Return setpoint min