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Siemens Building Technologies Basic Documentation RVA47.320 CE1P2379E
HVAC Products Description of the heating engineer settings 15.07.2002
Cascade settings
4.45 Changeover of boiler sequence in a
cascade
• Even wear and tear of the boilers in a cascade, or
• Selectable fixed switching on / off sequence
• 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.
1. Press the operating line selection buttons to select operating line 130.
2. Press the + / – buttons to select “---“ or enter the number of operating hours after
which changeover of boiler sequence shall take place.
Setting range Unit Factory setting
--- / 10...990 - / hours 500
--- Fixed switching on / off sequence of the boilers in the cascade. The lead
boiler can be freely selected (refer to operating line 132); the other boilers
are switched on and off in the order of the device addresses /
subaddresses.
10...990 On completion of the number of operating hours set here, the switching
sequence of the boilers in the cascade will change. This means that the
boiler with the next higher device address will become the lead boiler.
Example of four boilers with a set differential of 100 operating hours.
1
st
changeover 2
nd
changeover 3
rd
changeover 4
th
changeover
BMU 1
BMU 2
BMU 3
BMU 4
BMU 2
BMU 3
BMU 4
BMU 1
BMU 3
BMU 4
BMU 1
BMU 2
BMU 4
BMU 1
BMU 2
BMU 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]
Benefit
Description
Setting
Effect
Example:
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