Room Operating Mode Selection Using Room Unit Qaw740; Release Room Unit Qax3X.x For Time Switch Operating Mode Economy - Siemens RMB795B Basic Documentation

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The potential-free contacts for the digital inputs should be open when in the normal
position, enabling the RMB795B central control unit to operate in automatic mode
in the event of an open-circuit.
8.3.3 Room operating mode selection using room unit
QAW740
A room operating mode preselection can be configured using a QAW740 room unit
for each room group. It is active, if "QAW Zone (Apart.)" is set under
communication (see Sec. 13.2.2 "Room group 1...10") and the same zone is
preselected on the QAW740 room unit..
Using the Mode button on the QAW740 room unit, the required operating mode
can be selected. This room operating mode is transmitted to the RMB room group.
From the RMB795B central control unit, the setpoint readjustment is then passed
on to the RXB/RXL room controllers of the room group. The QAW740 room unit
does not act directly on RXB/RXL room controllers.
Preselection of the room operating mode by the QAW740 room unit has the same
priority as preselection via the RMZ79x, whereby the latter always prevails.
Priority sequence for the room operating mode:
1. Contacts on the RMB795B central control unit.
2. RMZ79x or QAW740 room unit (mode or timer button).
3. Timer function on the RMB795B central control unit.
4. Special day contact/RMZ79x .
5. Holiday contact/RMZ79x.
6. Time switch.
The timer function of the QAW740 room unit can be used to extend the Comfort
mode of a room group.
8.3.4 Release room unit QAX3x.x for time switch operating
mode Economy
The user can switch the room unit from Economy to Comfort if the RXB/RXL room
controller is equipped with a room unit QAX3x.x (with operating mode setting or fan
stage). As a result the entire air handling system may be turned on because of one
single room. Depending on the air system dimensions, inadmissible overpressure
can be created in the air pipes. The setting parameter "Comfort via room unit"
helps prevent this.
Comfort via room unit
= Yes
Comfort via room unit
= No
See RXB-/RXL application descriptions N3873/N3877.
Main menu> Commissioning> Settings> ... or
Main menu> Settings> Time switch 1 >
Operating line
Comfort via room unit
Central control unit RMB795B
Function block: "Room group"
Manual change of Economy to Comfort by QAX3x.x and
QAW740 possible.
Manual change of Economy to Comfort by QAX3x.x and
QAW740 is not possible.
Area
Yes / No
Factory setting
Yes
CE1P3122en
18.01.2012