Siemens RDF302 User Manual

32 / 62
Siemens RDF302 Basic documentation CE1P3079en
Smart Infrastructure 2022-06-17
3.7 Control outputs
3.7.1 Overview
Different control output signals are available. They need to be defined during
commissioning (see below).
Control output →
Product no.↓
2-position
3-position
RDF302, RDF302/VB,
RDF302.B
Y11, Y21
(2 x SPST)
Y11, Y21 *)
(1 x / )
*) Only on 2-pipe application
The valve or compressor receives the OPEN/ON command via control output Y11
or Y21 when…
1. the acquired room temperature is below the setpoint (heating mode) or above
the setpoint (cooling mode).
2. the control outputs have been inactive for more than the “Minimum output
OFF-time” (factory setting 1 minute, adjustable via parameter P48).
OFF command when…
1. the acquired room temperature is above the setpoint (heating mode) or below
the setpoint (cooling mode).
2. the valve has been active for more than the “Minimum output on-time” (factory
setting 1 minute, adjustable via parameter P49).
The electric heater receives an ON command via the auxiliary heating control
output (Y…, see Mounting Instructions) when…
1. the acquired room temperature is below the “Setpoint for electric heater”
2. the electric heater has been switched off for at least 1 minute
The OFF command for the electric heater is output when…
1. the acquired room temperature is above the setpoint (electric heater)
2. the electric heater has been switched on for at least 1 minute
A safety limit thermostat (to prevent over-temperatures) must be provided
externally.
When an electric heater is connected directly to the ON/OFF Y21, the current
causes the relay contact to heat up. This falsifies the reading of the internal
temperature sensor. The thermostat compensates the temperature if the rated
current/power of the electric heating is entered in the parameters
P46 (load current electric heater): factory setting: 0 A, setting range: 0.0…5.0 A.
Output Y11 provides the OPEN command, and Y21 the CLOSE command to the 3-
position actuator.
The factory setting for the actuator's running time is 150 seconds. It can be
adjusted via parameter P44.
The parameter is only visible if 3-position is selected via DIP switches.
Overview of control
outputs
ON/OFF control signal
(2-position)
Electric heater control
signal
(2-position)
Caution
Adaptive temperature
compensation for
electric heater
3-position
control signal

Siemens RDF302 Specifications

General

Brand	Siemens
Model	RDF302
Category	Thermostat
Language	English