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Siemens RDG100…/RDG110…/RDG140.../RDG160… Basic Documentation CE1P3076.en
Building Technologies Functions 19 Jun 2009
4.10 Multifunctional input, digital input
The thermostat has 2 multifunctional inputs X1 and X2 and a digital input D1.
A sensor type NTC like the QAH11.1 (AI, analog input) or a switch (DI, digital input)
can be connected to the input terminals. The functionality of the inputs can be
configured via parameters P38 for X1, P40 for X2, and P42 for D1.
# Function of input Description Type
X1/X2
Type
DI
0 Not used No function. -- --
1 External / return
air temperature
Sensor input for external room temperature sensor or
return air temperature sensor to acquire the current
room temperature, or floor heating temperature
sensor to limit the heating output.
Note: The room temperature is acquired by the built-in
sensor if the floor temperature limitation function is
enabled via parameter P51.
AI
2 Heating / cooling
changeover
Sensor input for automatic heating / cooling
changeover function.
A switch can also be connected rather than a sensor
(switch closed = cooling, see section 4.6).
AI/(DI)
DI
3 Operating mode
switchover
Digital input to switch over the operating mode to
Energy Saving.
If the operating mode switchover contact is active,
user operations are ineffective and “OFF” is displayed.
DI DI
4 Dewpoint monitor Digital input for a dewpoint sensor to detect
condensation. Cooling is stopped if condensation
occurs.
DI DI
5 Enable electrical
heater
Digital input to enable / disable the electrical heater
via remote control.
DI DI
6 Fault Digital input to signal an external fault
(example: dirty air filter).
If the input is active, “ALx” is displayed
(Alarm x, with x = 1 for X1, x = 2 for X2, x = 3 for D1).
Note: Fault displays do not influence the thermostat's
operation. They merely represent a visual signal.
DI DI
Operational action can be changed between normally open (NO) and normally
closed (NC) via parameter P39, P41 (or P43 if it is a digital input).
Each input X1, X2 or D1 must be configured with a different function (1…5).
Exception: 1, 2 or 3 inputs can be configured as alarm inputs (6).
X1 is factory-set to “External sensor” (1), X2 to “Heating / cooling changeover” (2),
and D1 to operating mode changeover (3).
For more detailed information, refer to section 4.5 “Applications”.
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