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Building Technologies
Modular Heating Controller RMH760B
CE1P3133en
HVAC Products
5 General functions, fundamentals
05.02.2007
Number Text
Effect
5302
>1 DHW time switch
Nonurgent message; must be acknowl-
edged
For each geographical zone, only one time switch master may be set. If several control-
lers are parameterized as masters, a fault status message will be delivered. The fault is
identified by the time switch master(A) when it receives a time switch signal from some
other master(B) in its own zone. Time switch master ”A” will then display and forward a
fault, but no more time switch signal, in order to prevent switching back and forth of the
slaves.
Number Text
Effect
5101
System time switch failure 1 Nonurgent message; must not be ac-
knowledged
5111
System time switch failure 2 Nonurgent message; must not be ac-
knowledged
5121
System time switch failure 3 Nonurgent message; must not be ac-
knowledged
5301
DHW system time switch
failure
Nonurgent message; must not be ac-
knowledged
The controller always expects a time switch signal from the bus. If not transmitted, the
controller will operate in “Comfort“ mode. In that case, fault status message
System time
switch failure 1
(or
2
or
3
) will be delivered.
5.2
Holidays and special days
Each heating circuit and DHW heating use their own holidays / special day program.
Weekdays deviating from the normal 7-day program can be entered by the plant opera-
tor as holidays or special days, using the “Holidays / special days“ menu. Entry is
described in Operating Instructions B3133.
The operating mode for the holiday period can be separately selected for each individ-
ual heating circuit and for DHW heating.
Function “Holidays / special days“ is active only if room operating mode “Auto“ has
been selected. The same applies to DHW heating. Here too, DHW operating mode
“Auto“ must be selected.
5.2.1 Communication
If the controller is connected to other controllers via bus, the holidays or 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
Autonomous The holidays / special day program only acts
in its own heating circuit or DHW and only in
the controller.
The holidays / special day program has no
impact on the holidays / special day zone
entered on the “Communication” menu.
Failure of system time
switch
Note
