Equipment combinations
Type of unit
Type reference
Data sheet
Temperature sensor
QAH11.1
1840
Room sensor
QAA32
1747
Changeover mounting kit
ARG86.3
1840
Motoric on/off actuator
SFA21...
4863
Thermal actuator (for radiator valve)
STA21...
4893
Thermal actuator (for small valve 2,5 mm)
STP21...
4878
Mechanical design
The unit consists of two parts:
•
A plastic housing which accommodates the electronics, the operating elements and
the built-in room temperature sensor
•
A mounting base
The housing engages in the mounting base and snaps on.
The base carries the screw terminals; the DIP switches are located at the rear of the
housing.
3021
Z
01
2
5
6
1
3
4
1. Operating mode selector
(standby, heating or cooling mode with manual selection of fan speed)
2 LEDs for indicating heating mode, cooling mode and fan operation
3 Setting facility for minimum setpoint limitation (in increments of 1 K)
4 Setting facility for maximum setpoint limitation (in increments of 1 K)
5 Room temperature setpoint knob
6
Set of DIP switches
DIP switch no. Meaning
Position ON
Position OFF
1
Fan control
Fan control is temperature-
dependent in all operating
modes
Fan control in normal operation is tem-
perature-independent
1)
2
Operating mode change-
over via an external switch
Changeover between normal
operation and energy saving
mode
Changeover between normal operation
and standby
1)
3
Operating action of switch
for external operating
mode changeover
Changeover activated when
contact of switch is closed
(N.O.)
1)
Changeover activated when contact of
switch is open (N.C.)
4
Standby
Frost protection function not
enabled
Frost protection function enabled
1)
5
Switching differential
1 K in heating mode
1)
0.5 K in cooing mode
1)
4 K in heating mode
2 K in cooling mode
Setting and operating
elements
Legend
5
