Operation Manual

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Siemens Schweiz AG User Manual CE1U2354en
HVAC Products Cascade 23. August 2007
2 x 1 cascade
Line no. Operating line
2340 Auto source seq 2x1 casc
Automatic changeover of the heat source enables a lead boiler change at certain
intervals. The boiler sequence changes when the selected time has elapsed.
When switching on automatic changeover, heat source 1 (T2) is always started up as
the lead boiler.
The time remaining until the next changeover takes place and the current lead boiler
are not displayed.
6.13 Cascade
Control
Line no. Operating line
3532 Restart lock
3533 Switch-on delay
The restart lock prevents a deactivated heat source from being switched on again. It is
released again only after the set time has elapsed. This prevents too frequent switching
actions of the heat sources and ensures stable plant operating states.
Correct adjustment of the switch-on delay ensures that plant operating conditions will
be stable. This prevents too frequent switching actions of the boilers (cycling).
In the case of a DHW request, the delay time is fixed at 1 minute.
Boiler sequence
Line no. Operating line
3540 Auto source seq ch’over
3541 Auto source seq exclusion
None.
First
Last
First and last
3544 Leading source
Device 1…device 16
With automatic source sequence changeover, the boiler loads in a cascade can be
influenced by defining the order of lead and lag boiler.
Fixed order
Setting - - - defines a fixed order. In that case, the lead boiler can be selected on
operating line 3544; the other boilers are then switched on and off in the same order as
the LPB device addresses.
Order according to the number of operating hours
On completion of the number of hours set, the boiler sequence in the cascade changes.
It is always the boiler with the next higher device address which assumes the role of the
lead boiler.
Restart lock
Switch-on delay
A
uto source seq ch’over
RVS63.. onl
y