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Siemens
QAX33.1 – Room unit with PPS2 interface
CA2N1642en_02
Building Technologies
30 Jun 2009
Ordering
When ordering, please specify the quantity, product name and type code.
Example:
30
Room units
QAX33.1
Equipment combinations
The room unit is suitable for use in conjunction with all controllers which incorporate a
PPS2 room unit interface (e.g. DESIGO RX, DESIGO PX).
Mechanical design
The room unit is designed for surface mounting (with knock-outs for cable entry from
the top or bottom) or for mounting on a recessed conduit box with the cables connected
from the rear.
The unit comprises a housing and base unit, connected by releasable snap-fittings.
The base unit accommodates the screw terminals which have an integrated terminal
strip.
The housing accommodates a printed circuit board, room temperature sensor element,
setpoint adjuster, rocker switch for mode selection and fan speed selection, plug-in
connectors and a socket for the commissioning and service tool or service terminal.
Both the housing and base are made of plastic.
Base unit
Housing
80082
80084
Socket for the commissioning
and service tool or service
terminal
80168A
Dial for stepless adjustment of the setpoint
LEDs to indicate control mode and fan speed
Rocker switch for mode selection and fan speed
The controller control mode can be selected on the basis of occupancy, using the
rocker switch on the room unit. The same switch can also be used for manual selection
of up to three fan speeds.
Pressing once in the direction of the left arrow switches one stage to the left, and press-
ing once in the direction of the right arrow switches one stage to the right. The current
control mode or the manually selected fan speed is indicated by LED.
Operator controls
and indication
Rocker switch for selec-
tion of mode and fan
speeds
