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Building Technologies Basic Documentation LMV5... CC1P7550en
7 Boiler controller / load controller 22.05.2018
7.10 Multiboiler plants
Boiler sequence control is accomplished with the help of external devices or control
systems (e.g. BACS or PCs).
In principle, 2 choices are available:
7.10.1 Multiboiler plants by means of analog input
For that purpose, the load controller of the LMV5 has an analog input (X62).
This means that the individual boilers can be…
a) released / locked, and
b) operated at the required output (or set to the required setpoint).
7.10.2 Multiboiler plants by means of digital interface
For that purpose, BACS terminal X72 on the AZL5 can be used via the bus interface.
Inputs:
∂ Controller release / lock
∂ Predefined setpoint or predefined load
Outputs:
∂ Actual value
∂ Controller ON/OFF
∂ Manipulated variable multistage / modulating
∂ Error messages
For more detailed information, refer to chapter Cold start thermal shock protection.
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