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Siemens
QAX34.1 – Room unit with PPS2 interface
CA2N1645en_02
Building Technologies
30 Jun 2009
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 in the display panel by a
horizontal bar below the associated symbol.
Position Fan speed 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)
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
Press the switch once to switch from a display of the current room temperature to a
display of the setpoint. Each further operation of the
+
or
–
switch raises or lowers the
setpoint by 0.5 K or 1.0 °F (the unit of measurement is determined by the controller).
The controller also determines the maximum adjustment range allowed.
In normal operation, the following may be displayed (depending on the controller con-
figuration). For details of these functions, refer to the application description for the
relevant controller range.
Display element
(examples)
Description
Room temperature in °C (resolution 0.5 °C)
Room temperature in °F (resolution 1.0 °F)
Digital display of setpoint adjustment
(displayed only while
relative
adjustment is in progress).
Digital display and scale
(displayed only while
absolute
adjustment is in progress)
Control sequence: Cooling
Control sequence: Heating
Room units with mode and fan-speed selection enabled:
Fan speed 1:
ON
In room units allowing mode selection only:
Auto:
ON
Rocker switch room for
temperature setpoint
adjustment
LCD display
