Siemens RDG User Manual

21
Application-specific parameter
This parameter is used to set the required heating and/or cooling sequence and to select
automatic/manual changeover. Depending on selected application parameter P01 will be
preset as follow:
– 2-pipe or single-duct application: P01: = 1 = cooling only
– 4-pipe application: P01: = 4 = heating and cooling
A sensor of type NTC like QAH11.1 (AI) or a switch (DI) can be connected to the input
terminals. The functionality of the inputs can be freely configured. The factory settings are:
Available function on X1, X2 and D1
– The RDG100 offers two control outputs, each either of type ON/OFF, PWM or 3-position.
To select the required type use DIP switch and P46 (1st control output) and/or P47
(2nd control output).
– The RDG400 for VAV application offers two control outputs, DC 0…10 V and either
ON/OFF, PWM or 3-position. To select the required type use DIP switch and P46
(reheater/cooler control output) and/or P47 (damper actuator, DC 0...10 V or 3-pos).
Control sequence (P01)
Multifunctional inputs
(X1, X2, D1)
Control output (P46…P47)
Sequence
Mode
Heating only Cooling only
Manually select
heating or
cooling mode
Automatic
heating/cooling
changeover
Heating and
cooling mode
Parameter
P01=0 P01=1 P01=2 P01=3 P01=4
RDG range RDF range
P38: Multifunctional input X1
External temperature sensor (1) Operating mode switchover (3)
P40: Multifunctional input X2
Heating/cooling changeover (2) Heating/cooling changeover (2)
P42: Multifunctional input D1
Operating mode switchover (3) N/A
Function of inputs Description
1
External/return air temperature (AI)
(not available for input D1)
Temperature sensor input for
– External room temperature
– Return air temperature
– Floor temperature sensor to limit the heating output
2
Heating/cooling changeover (AI/DI) Automatic heating/cooling changeover sensor or switch
3
Operating mode switchover (DI) Digital input to switch the operating mode to energy saving
4
Dewpoint monitor (DI) Digital input for a dewpoint sensor to detect condensation
5
Enable electrical heater (DI) Digital input to enable/disable the electrical heater via remote control
6
Fault (DI) Digital input to signal a fault on the digital display (e.g. dirty air filter)

Siemens RDG Specifications

General

Brand	Siemens
Model	RDG
Category	Thermostat
Language	English