Basic Documentation

Functions
Temperature control
4
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A6V12114068_en--_c
4 Functions
4.1 Temperature control
Setting of the control parameters (P01, etc., mentioned throughout the document),
see Control parameters [➙ 53].
The thermostat acquires the room temperature via built-in sensor, external room
temperature sensor (QAA32), external return air temperature sensor
(QAH11.1/QAP1030/UFH), and maintains the setpoint by delivering actuator
control commands to heating equipment, cooling equipment or both. The following
control outputs are available:
● On/Off control (2-position)
● Modulating PI/P control with 3-position control output (only for 2-pipe
applications)
The switching differential or proportional band is 2 K for heating mode and 1 K for
cooling mode (adjustable via P30 and P31).
The integral action time for modulating PI control is 45 minutes (adjustable via
P35).
The display shows the acquired room temperature or the Comfort setpoint,
selectable via P06. The factory setting displays the current room temperature.
Use P04 to display the room temperature or setpoint in °F rather than °C as
needed.
The acquired room temperature (internal or external sensor) is available as
information on the bus.
● With automatic changeover or continuous heating/cooling, symbols
indicate that the system currently heats or cools (heating or cooling output is
activated).
● With manual changeover (P01 = 2), symbols indicate that the
system currently is in heating or cooling mode. Thus, the symbols are
displayed even when the thermostat is in the neutral zone.
Concurrent display of the current temperature or setpoint in °C and °F is available
(P07 = 1) on the thermostat.
The outside temperature can be displayed on the thermostat by setting P07 = 2.
This temperature value is for information only and comes from the master device in
the Modbus network.
Time of day via Modbus can be displayed on the room thermostat by setting
P07 = 3 or 4). The display format is either in 12- or 24-hour format.
The information can be received from a master device in the Modbus network.
General note:
Parameters
Temperature control
Display
Room temperature
Concurrent display of °C
and °F
Outside temperature
Time of day