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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 17 Function block: Service functions and general settings 15.03.2011
Critical locking signals are generated by the boiler temperature controller during
protective boiler startup and during minimum limitation of the boiler return tempera-
ture. If the boiler temperature controller is located in segment 0, the critical locking
signal is sent to all consumers and heat exchangers in the bus network and – if
present – to its own heating and d.h.w. circuit. If the boiler temperature controller is
located in segment 1…14, it only delivers the critical locking signal to all loads in
the same segment and – if present – to its own heating and d.h.w. circuit.
Minimum limitation of the return temperature can also be ensured locally by a con-
troller with plant type 1 - x. In that case, the critical locking signal only acts inside
the controller and is only delivered to the controller’s own heating circuit and the
d.h.w. circuit.
With regard to the response of the consumers and heat exchangers, there are 2
choices:
Heat exchangers and consumers with mixing valve/2-port valve:
The flow temperature setpoint is reduced as a function of the set locking signal
gain. Heat exchangers and consumers close their mixing valve/2-port valve
Consumers with pump circuit:
When the critical locking signal reaches a defined value, the pump is deacti-
vated, independent of the set locking signal gain. In plants using a diverting
valve, the valve is driven to the heating circuit position
Critical
locking signals
78


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