Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Temperature controller (basic type A) 03.10.2011
11.8 Room control combinations with heating
controller
If a heating and ventilation controller together control the same room and are
connected to the same bus, they can exchange information.
Both controllers must have the same geographical zone and both must work with
the same room operating mode.
The room control combination (see section 6.13.2) at the ventilation controller must
be s
et to master.
QAW740 RM.. RM..
3150Z05en
Geogr zone = 5
Room unit
Room operating mode Room operating mode
Geogr zone = 5
Ventilation 1
Room control comb. =
Master
Room control comb. =
Slave external setpoints
Heating circuit 1
Geogr zone = 5
The ventilation controller sends the values
Comfort heating setpoint,
Precomfort heating setpoint, and Economy heating setpoint to the heating
controller via bus to overwrite the setpoints in the heating controller. Heating and
ventilation controller thus use the same setpoints.
These values can no longer be set on the heating controller. If a readjustment is
needed, it must be entered on the ventilation controller (master).
When cooling is called for while the heating plant is on, the heating is immediately
switched off. It can be switched on again only after all cooling sequences of the
ventilation controller are shut down.
Technical plant conditions may need to be observed depending on the ventilation
controller control mode. These are described in the following sections.
11.8.1 Control mode for supply air temperature control
When control strategy "Supply air temperature control" is selected on the
ventilation controller, room temperature control can be provided by the heating
controller (room influence activated or thermostatic radiator valves fitted).
In the
Comfort and Precomfort modes, the heating controller ensures that the
required room temperature is maintained. The ventilation controller controls the
supply air to the set supply air temperature setpoint. In
Economy mode and
when heating is on (in winter and during intermediate seasons), the sustained
"Heating" function on the ventilation controller is deactivated. It is released again
only when the heating controller switches off.
Operating principle