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Siemens Building Technologies
Basic Documentation RVA47.320
CE1P2379E
HVAC Products
Description of the heating engineer settings
15.07.2002
55
Actual value of the boiler temperature
90
Minimum limitation of the boiler temperature setpoint
2
OEM
Maximum limitation of the boiler temperature setpoint
1
OEM
Lowest minimum limitation of the boiler temperature setpoint
If the boiler temperature falls below the set minimum temperature, this setting
generates a locking signal which reduces the amount of heat supplied to the
consumers.
4.24
Nominal output of BMU 1 - 4
•
Consideration is given to the different heat source capacities
By setting this paramter, the controller knows the proportion of capacities of the
connected boilers and can take this into account with the running time strategy and the
linked lead boiler operation (refer to page 114 ff.).
1.
Press the line selection buttons to select lines 91 -94.
2.
Press the + / - buttons to set the nominal capacities of BMUs 1 - 4.
Line
BMU-Nr.
Setting range
Unit
Factory setting
BMU1 0...255
kW 20
BMU2 0...255
kW 20
BMU3 0...255
kW 20
BMU4 0...255
kW 20
The controller only uses the proportions of the numbers entered. When having
capacities of 100 / 150 / 70 kW, entry of the proportions of 10 / 15 / 7 or 20 / 30 / 14 will
lead to the same result as entry of the absolute figures. Hence, capacities above 255
kW can also be entered by using the respective ratios.
This setting has an impact on the accuracy of the points in time the individual boilers
are switched on and off (refer to boiler management and running time strategy,
operating line 50
OEM
).
Autonomous lead boiler operation:
No effect
Linked lead boiler operation:
The lag boilers follow the lead boiler's output at different speeds, depending on the
proportion of capacities of lead boiler and lag boilers.
Running time strategy 1 - 3:
Additional boilers are switched on or off earlier or later, depending on the capcities of
the individual boilers in sequence.
Effect
Benefit
Description
Settings
Note
Effect
