Siemens RVA63.242 - Cascade; Changeover of Boiler Sequence in a Cascade 2 X Single-Stage

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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of heating engineer settings 26.03.2001
Cascade
4.59 Changeover of boiler sequence in a cascade
2 x single-stage
Even load on the boilers of a cascade or fixed switching of boiler sequence can be
selected.
Different time intervals for changeover of boiler sequence can be set.
The parameter determines whether or not the switching on / off sequence of the boilers
shall be changed after an adjustable period of time.
Setting range Unit Factory setting
--- / 10...990 – / hours 500
--- Fixed switching on / off sequence of the boilers in the cascade.
10...990 On completion of the number of operating hours set here, the switching
sequence of the boilers in the cascade will change. The other boiler will
then become the lead boiler.
Example of 2 single-stage boilers with a set differential of 100 operating hours.
K 1
K 2
K 2
K 1
t [h]
100 300200
P [kW]
2373Z57
t Total number of operating hours of all lead boilers [h]
P Total output of cascade [kW]
Benefits
Description
Setting
Effect
Example
1. Changeover
Lag boiler
lead boiler