Nominal Output Of Bmu 1 - 4 - Siemens RVA47.320 User Manual

Effect
Benefit
Description
Settings
Note
Effect
Siemens Building Technologies
HVAC Products
55 Actual value of the boiler temperature
90 Minimum limitation of the boiler temperature setpoint
2 Maximum limitation of the boiler temperature setpoint
OEM
1 Lowest minimum limitation of the boiler temperature setpoint
OEM
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.
BMU1
BMU2
BMU3
BMU4
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.
Basic Documentation RVA47.320
Description of the heating engineer settings
Setting range Unit
0...255 kW
0...255 kW
0...255 kW
0...255 kW
Factory setting
20
20
20
20
73/166
CE1P2379E
15.07.2002