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Siemens RDU340… Basic Documentation CE1P3078en

Building Technologies Functions 2014-09-05

4.5 Additional features

The air or water temperature acquired by the changeover sensor (QAH11.1) is

used to change over from heating to cooling mode and vice-versa. When the water

temperature is above 28 °C (parameter P37), the controller changes 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 power up,

the controller starts in heating mode. The water temperature is acquired at 30-

second intervals and the operating state is updated accordingly.

[°C]

M Operating mode Cooling mode

Air or water temperature

Heating mode

The QAH11.1 cable temperature sensor for automatic heating/cooling changeover

can be replaced by an external switch for manual, remote changeover:

3076Z03

QAH11.1

T °C

Contact open  heating mode

Contact closed  cooling mode

The sensor or switch can be connected to the input terminal of X2 (factory setting)

or X1 depending on the commissioning of inputs X1 and X2. See also section

“Multifunctional input”.

The controller acquires the room temperature via built-in sensor, external room

temperature sensor (QAA32), or external return air temperature sensor (QAH11.1)

connected to multifunctional input X1 or X2.

Inputs X1 or X2 need to be commissioned accordingly. See section 4.8 “Multi-

functional input”.

Dewpoint monitoring is essential to prevent condensation on the chilled ceiling and

help avoid associated damage to the building. This is an optional function and is

provided in case the controller is used for a chilled ceiling application.

A dewpoint sensor with a voltage-free contact is connected to multifunctional input

X1 or X2. If there is condensation, the cooling valve is fully closed until no more

condensation is detected and the cooling output is disabled temporarily. The

condensation symbol

is displayed during temporary override.

Input X1 or X2 must be commissioned accordingly.

See section “4.8 Multifunctional input”.

If the keypad lock function is enabled by parameter P14, then pressing 7 seconds

on the operating mode button

, the keypad will be locked or unlocked

respectively.

If “Auto lock” is configured, then the controller will automatically lock the keypad

after 30 seconds of the last adjustment.

Automatic H/C

changeover

Remote heating/

cooling changeover

External/return

temperature sensor

Dewpoint monitoring

Keypad lock

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