Additional Functions - Siemens RDF301 Basic Documentation

Heating / cooling
changeover via bus
Heating/cooling
changeover
Automatic heating /
cooling changeover via
changeover sensor
Changeover switch
Note
Manual heating /
cooling changeover
External / return air
temperature sensor
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Siemens
Building Technologies
3.5 Additional

Additional functions

The heating / cooling changeover information can be received via bus. This is only The heating cooling changeover information can be received via bus. This is only
possible if the possible if the control sequence is set to automatic heating / cooling changeover
(parameter P01 = 3) and no local input X1, X2 is assigned with this function. (parameter P01 = 3) and no local input X1, X2 is assigned with this function. (parameter P01 = 3) and no local input X1, X2 is assigned with this function.
In the absence of the required information (e.g. due to problems with data In the absence of the required information (e.g. due to problems with data In the absence of the required information (e.g. due to problems with data
communication, power failure, etc.), the thermostat operates in the last valid room communication, power fa
operating mode (heating or cooling). operating mode (heating or cooling).
If a cable temperature sensor (QAH11.1 + ARG86.3) is connected to X1 / X2, and If a cable temperature sensor (QAH11.1 + ARG86.3
parameter P38 / P40 is = 2, the water temperature acquired by the changeover parameter P38 / P40 is =
sensor is used to change over from heating to cooling mode, or vice versa. When sensor is used to change over from heating to cooling mode, or vice versa. When sensor is used to change over from heating to cooling mode, or vice versa. When
the water temperature is above 28 °C (parameter P37), the thermostat the water temperature is above 28 °C (parameter P37), the thermostat the water temperature is above 28 °C (parameter P37), the thermostat changes
over to heating mode, and to cooling mode when below 16 °C (parameter P36) over to heating mode, and to cooling mode when below 16 °C (parameter P36). over to heating mode, and to cooling mode when below 16 °C (parameter P36)
If the water temperature is between the 2 changeover points immediately after If the water temperature is between the 2 changeover points immediately after If the water temperature is between the 2 changeover points immediately after
power-up, the thermostat starts in up, the thermostat starts in the previously active mode.
The water temperature is acquired at 30-second intervals and the operating state is The water temperature is acq
updated accordingly. updated accordingly.
M
16 28
M Operating mode Operating mode
T Water temperature Water temperature
w
The QAH11.1 cable temperature sensor for automatic heating / cooling changeover The QAH11.1 cable temperature sensor for automatic heating / cooling changeover The QAH11.1 cable temperature sensor for automatic heating / cooling changeover
can be replaced by an external switch for manual, remote changeover: can be replaced by an external switch for manual, remote changeover: can be replaced by an external switch for manual, remote changeover:
X2
M
QAH11.1
The sensor or switch can be connected to input terminal X2 or X1, depending on The sensor or switch can be connected to input terminal X2 or X1, depending on The sensor or switch can be connected to input terminal X2 or X1, depending on
the commissioning of the inputs (P38, P40). the commissioning of the inputs (P38, P40).
See also section 3.9. See also section
By using an external switch as changeover, the Operating action (via parameters By using an external switch as changeover, the Opera
P39 or P41 P41) cannot be modified.
The assignment is fix: Contact open The assignment is fix:
If manual heating / cooling changeover is commissioned (P01 = 2), then heating / If manual heating / cooling changeover is commissioned (P01 = 2), then heating / If manual heating / cooling changeover is commissioned (P01 = 2), then heating /
cooling mode cannot be changed via bus / changeover sensor / switch; it will cooling mode cannot be changed via bus / chang
remain in the last mode as selected locally via button. remain in the last mode as selected locally via button.
The thermostat thermostat acquires the room temperature via built-in sensor, external room
temperature sensor (QAA32), or external return air temperature sensor (QAH11.1) perature sensor (QAA32), or external return air temperature sensor (QAH11.1) perature sensor (QAA32), or external return air temperature sensor (QAH11.1)
connected to multifunctional input X1 or X2. connected to multifunctional input X1 or X2.
Inputs X1 or X2 Inputs X1 or X2 must be commissioned accordingly.
See section See section 3.9.
RDF301, RDF301.50..., RDF600KN RDF301, RDF301.50..., RDF600KN, RDF600KN/S
is set to automatic heating / cooling changeover
, the water temperature acquired by the changeover
second intervals and the operating state is
T [°C]
w
Cooling mode
Heating mode
X2
T
M
3076Z03
⇓ heating mode heating mode
Contact closed ⇓ cooling mode
Basic Documentation
operates in the last valid room
) is connected to X1 / X2, and
mode.
Contact open ⇓ heating mode Contact open
Contact closed ⇓ cooling mode Contact closed
ting action (via parameters
over sensor / switch; it will
in sensor, external room
ocumentation CE1P3171en
2017-12-07