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Building Technologies Boiler sequence controller RMK770 CE1P3132en
HVAC Products 5 General functions, fundamentals 23.04.2009
5.1.3 Fault handling
For each "Geographical zone", only one time switch master may be used. If several
controllers are parameterized as the master, a fault status message is delivered. The
message is sent by the controller which receives 2 time switch signals.
Number Text Effect
5102 >1 time switch in
plant 1
Nonurgent message; must be acknowledged
For each “Geographical zone”, only 1 time switch master can be used. If several con-
trollers are parameterized as masters, a fault status message is delivered. The fault is
identified by the time switch master (A) if it receives a time switch signal from some
other master (B) in its own zone. Then, time switch A displays and delivers a fault
status message, but no more time switch signal, to prevent the slaves from switching
back and forth.
Number Text Effect
5101 Syst time switch failure
plant 1
Nonurgent message; must not be acknowl-
edged
If the controller anticipates a time switch signal via bus, but the signal is not sent, the
controller operates in ”Comfort“ mode and fault status message System time switch failure
1 is delivered.
5.2 Holidays / special days
Days deviating from the normal 7-day program can be entered by the plant operator as
holidays or special days, using the Holidays/special days menu. Entry is described in the
Operating Instructions (B3133x…).
For each RMK770 controller, a holidays / special day program is available. The operat-
ing mode to be used during the holiday period can be individually selected for each
heating circuit.
The “Holidays/special day” function is active only if the room operating mode or the
DHW Auto mode has been selected for the heating circuit(s) and/or DHW heating.
The RMK770 does not provide DHW heating, but DHW signals from the KNX bus can
have an impact.
5.2.1 Communication
If the controller is connected to other controllers via bus, the holidays / special day
program can be made available to other controllers (master), or it can be adopted from
some other controller (slave).
The following combinations are possible:
Entry Effect Diagram
Autono-
mous
The holidays / special day program only acts
locally on this controller.
The holidays / special day program has no
impact on the holidays / special day zone
entered under communication.
Fault status messages
Note on holidays / special
days
Note on DHW heating
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