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Siemens RDG100…/RDG110…/RDG140.../RDG160… Basic Documentation CE1P3076.en
Building Technologies Functions 28 May 2009
The RDG1xx.. can also be used on universal applications, e.g. fan coil-based
cooling and floor heating, or chilled ceiling and electrical heater, etc.
For more detailed information, refer to subsection 4.7.9 ff.
4.6 Additional features
The water temperature acquired by the changeover sensor (QAH11.1 + ARG86.3)
is used to change over from heating to cooling mode and vice versa. When 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).
If the water temperature is between the 2 changeover points immediately after
power-up, the thermostat starts in heating mode.
The water temperature is acquired at 30-second intervals and the operating state is
updated accordingly.
16
M
T
w
[°C]
28
M Operating mode
Cooling mode
T
w
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
X2
M
T
X2
M
QAH11.1
T °C
Contact open heating mode
Contact closed cooling mode
The sensor or switch can be connected to input terminal X2 (factory setting) or X1
or D1 (switch only), depending on the commissioning of the inputs (P38, P40, P42).
See also section 4.10 “Multifunctional input”.
The thermost
at acquire
s 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 must be commissioned accordingly. See section 4.10 “Multi-
func
tional input”.
1)
Heat pump application covered by RDG110
(SPDT = relay with NO and NC contact)
2) With ECM fan control DC 0…10 V
Key Y1 Heating or heating/cooling valve actuator M1 1-speed or 3-speed fan
Y2 Cooling valve actuator B1 Return air temperature sensor or external
room temperature sensor (optional)
E1 Electrical heater B2 Changeover sensor (optional)
Note The diagrams above only show the water-based fan coil applications, but not the compressor
Universal applications
Automatic heating /
cooling changeover
Remote heating /
cooling changeover
External / return air
temperature sensor
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