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Siemens Building Technologies
Basic Documentation RVD230
CE1P2383en
HVAC Products
22 Locking signals
27.05.2004
22.3 Uncritical locking signals
22.3.1 General
Uncritical locking signals are generated in connection with d.h.w. priority (absolute and
shifting) and only act on the heating circuits and heat converters. The following locking
signals exist:
•
"Controller-internal locking signals" and
•
"Locking signals from the data bus” (LPB)
For detailed information, refer to section 16.6.
All heat converters that lie in the supply chain of the d.h.w. demanding priority are not
affected by the uncritical locking signal.
Whether the controller shall respond to uncritical locking signal from the data bus can
be selected on operating line 137 (response to uncritical locking signals from the data
bus). The setting does not affect the response to controller-internal locking signals.
Operating line 137 Response
0
Uncritical locking signals from the data bus will be ignored
1
Uncritical locking signals from the data bus will be adopted
22.3.2 Controller-internal
uncritical locking signals
Controller-internal uncritical locking signals always throttle the heating circuits.
•
With plant types 5–9 and 5–10, the heat converter (primary controller) parallel to d.h.w.
will be affected
•
With plant type 5–4, the controller-internal uncritical locking signals have no impact on
the heat converter
22.3.3 Uncritical locking signals from the data bus
Uncritical locking signals from the data bus throttle the heat converters and the heating
circuits.
