User Manual

3/8
Siemens QAX84.1/PPS2 – Flush-mounting room unit with PPS2 interface CA2N1649en_04
Building Technologies 2015-12-23
1649z02
Auto
Room temperature display and
control sequence indicator (heating or cooling)
Current control mode or current fan speed
Buttons to select control mode and fan speed
Buttons for adjustment of the room temperature setpoint
The controller determines the actual functions of the buttons and display (based on the
selected application and the associated parameters).
The following describes all the functions of the elements illustrated.
• The buttons can be used like an occupancy button to determine the control mode
(
/ Auto). They can also be used to define three manual fan speeds.
• Pressing the left button selects the option one step to the left, and pressing the right
button selects the option one step to the right.
• The currently active control mode or the manually selected fan speed is indicated by
a bar under the relevant symbol.
Item
Fan speed
1)
Operating mode
1)
Fan controlled automatical-
ly by the controller
The controller uses setpoints for re-
duced operation (room partially occu-
pied or empty / night).
Fan controlled automatical-
ly by the controller
Controller operates in Comfort mode
(room occupied).
Manual, fan-speed 1
Manual, fan-speed 2
Manual, fan-speed 3
1) For a detailed description of these functions, please refer to the application description for the con-
troller range concerned.
• When one of the buttons is pressed for the first time, the LCD display switches from
room temperature to setpoint display
• Each additional operation of the + or – button increases or reduces the setpoint by
0.5 K or 1.0 °F (the controller determines the engineering unit)
• The maximum possible adjustment range is also determined by the controller.
Operator controls and
display panel
Note
Keys to select control
mode and fan speed
Buttons for adjustment of
the room temperature
setpoint