Basic Documentation

Functions
Additional functions
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A6V12166490_en--_c
4.5.1 Sensors and changeover functions
If a cable temperature sensor (QAH11.1 + ARG86.3) is connected to X1, and P38
is set to 2, the water temperature acquired by the changeover sensor is used to
change over from heating to cooling, or vice versa.
● When the water temperature is above 28 °C (adjustable via P37), the
thermostat changes over to heating and remains there until the temperature
drops below 16 °C (adjustable via P36).
● When the water temperature is below 16 °C (P36), the thermostat changes
over to cooling and remains there until the temperature exceeds 28 °C (P37).
● If the water temperature is between the 2 changeover points immediately after
power-up (within hysteresis), the thermostat starts in the previous mode.
The water temperature is acquired at 30 s intervals and the operating state is
updated accordingly.
M
Operating mode
Cooling mode
T
w
Water temperature
Heating mode
The setting range is 10...25 °C for P36 and 27… 40 °C for P37.
The QAH11.1 cable temperature sensor for automatic heating / cooling
changeover can be replaced by an external switch for manual, remote changeover:
Contact open ⇨ Heating mode
Contact closed ⇨ cooling mode
The sensor or switch connects to input terminal X1 or X2, depending on input
commissioning (P38, P40).
See also Multifunctional input, digital input [➙ 40].
● An external switch is connected to X1/X2 (P38/P40 = 9) to change
heating/cooling mode remotely.
● Manual heating/cooling changeover means selection via changeover button on
the thermostat by repeatedly pushing the button until the required mode is
displayed (automatic changeover via external sensor / switch connected to X1
or x2).
● If manual heating/cooling changeover is commissioned (P01 = 2),
heating/cooling mode cannot be changed via changeover sensor/switch; it
remains in the last mode selected locally via button.
The thermostat acquires the room temperature via built-in sensor, external room
temperature sensor (QAA32), or external return air temperature sensor (QAH11.1
or QAP1030/UFH) connected to multifunctional input X1 or X2.
Inputs X1 and X2 must be commissioned accordingly. See Multifunctional input,
digital input [➙ 40].
Automatic
heating/cooling
changeover via
changeover sensor (P36,
P37)
Note
Changeover switch (P38,
P40)
Manual heating/cooling
changeover (P01)
External/return air
temperature sensor
(P38, P40)