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Siemens
QAX33.1 – Room unit with PPS2 interface
CA2N1642en_02
Building Technologies
30 Jun 2009
Position Fan
control
1)
Control
mode
1)
Fan controlled automati-
cally by controller
The controller operates at the “setback”
setpoints (at night, or when room is un-
occupied or occupied intermittently)
Auto
Fan controlled automati-
cally by controller
Comfort mode (room occupied)
Manual, fan speed 1
Manual, fan speed 2
Manual, fan speed 3
1)
For details of these functions, refer to the application description for the relevant controller range.
01884
Address plugs inside the housing
They allow setting the address in cases where several
room units are connected to one controller.
The room units are delivered with address 1.
Disposal
The device is classified as waste electronic equipment in terms of the European Direc-
tive 2002/96/EC (WEEE) and should not be disposed of as unsorted municipal waste.
The relevant national legal rules are to be adhered to.
Regarding disposal, use the systems setup for collecting electronic waste.
Observe all local and applicable laws.
Engineering notes
The device receives its power from the connected controller via the PPS2 interface
(extra low voltage).
Only one room unit may be connected to a RX… room controller.
A maximum of 5 room units may be connected to a PXC… automation station (they are
identified by different settings of their address plugs)
A twisted-pair cable is required for the connection to the controller.
DESIGO RX uses four-core cables, DESIGO PX uses two-core cables (see the respec-
tive installation guides). Screening is not required.
Mounting
The room unit is suitable for wall-mounting and for mounting on a recessed conduit
box.
Do not mount in recesses, shelves, behind curtains or doors, or above or near heat
sources.
Avoid exposure to direct sunlight or draughts.
The electrical wiring conduit must be sealed where it joins the room unit, to prevent
the occurrence of draughts in the conduit which could affect the sensor.
The specified ambient conditions must be complied with.
Mounting instructions are printed on the room unit packaging.
A mounting kit is included with the unit.
Address plugs
