Siemens RDF600 Series Basic Documentation

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4.9 Multifunctional input
The controller offers two multifunctional inputs X1 and X2. A sensor of type NTC
like QAH11.1 (AI) or a switch (DI) can be connected to the input terminals. The
functionality of both inputs can be configured via parameters P38 for input X1 and
P40 for input X2.
#
Function of input X1/X2
Description
Type
0 Not used No function. -
1 External/Return air temp. Sensor input for external room
temperature sensor or return air
temperature sensor to measure the
current room temperature, or floor
heating temperature sensor to limit
the heating output.
Note: The room temperature is
measured by the built-in sensor if
the floor heating limitation function
is enabled via parameter P51.
AI
2 Heat/cool changeover Sensor input for automatic heating /
cooling changeover function.
A switch can also be connected
rather than a sensor (switch closed
= cooling, see section 4.5).
AI/(DI)
3 Operating mode switchover Digital input to switch over the
operating mode to Economy.
If the operating mode switchover
contact is active, user operations
are ineffective and “OFF” is
displayed.
DI
4 Dewpoint monitor Digital input for a dewpoint sensor
to detect condensation. Cooling is
stopped if condensation occurs.
DI
5 Enable electrical heater Digital input to enable/disable the
electrical heater via remote control.
DI
6 Alarm Digital input to signal an alarm. If
the input is active, “ALx” (x:=1 or 2) is
displayed.
Note: Alarm displays do not influ-
ence controller operations. They
merely represent a visual signal.
Example: dirty air filter
DI
Operational action can be changed between normally open (N.O.) and normally
closed (N.C.) via parameter P39 or P41 if it is a digital input (DI).
Each function can only be assigned to input X1 or X2; only “Alarm” can be
assigned to both inputs.
X1 is factory-set to “Operating mode switchover” (3) and X2 to “Heating/cooling
changeover” (2).
For more information see section 4.4 “Applications”.

Siemens RDF600 Series Specifications

General

Brand	Siemens
Model	RDF600 Series
Category	Thermostat
Language	English