
Installation & initial operation
"R-Tronic" + "R-Con"
46
4.7
Controller settings at the wireless receiver "R-Con"
The response behaviour to the heat demands for the connected rooms or
heating zones emitted by the wireless thermostats can be influenced via the
controller settings at the wireless receiver. Control operation is possible via
pulse-width modulation (PWM) or two point control (2-PT).
4.7.1 Selection of the operating mode
A controller setting to pulse-width-modulation (PWM) is recommended for
surface heating systems
. This allows a
quick and exact reaction to tem-
perature differences
between the
actual values
measured by the wireless
thermostat and the defined
nominal values
.
As for PWM control, the opening and closing time of the actuator connected
to a channel is calculated from the temperature difference between the actual
and nominal value. The higher the difference, the longer the opening time and
the shorter the closing time of the actuator (and vice versa).
NOTE
A PWM parameter which can be set at the control module defines the tem
-
perature difference (control deviation) from which the actuator of a channel
is fully opened and a maximum heat output is started.
Example:
If the parameter value is set to 2.0 (see example 1a-c), the actuator
is fully opened by the control module at a temperature difference of 2.0°C (or
more). If the temperature difference is undercut, it is clocked and the heat
output is reduced.
4.6.6 "Emergency operation" of control module "R-Con T 2P"
The control modules of the wireless receiver feature an "emergency operation"
function. Switching to "emergency operation" which serves the protection of
the pipework against frost in case of malfunctions is achieved by clocking the
connected actuators to a fixed opening and closing ratio of 4.5 : 10.5 minutes.
If a control module switched to "emergency operation", the LED embedded
in the upper rotary switch will flash even though the lower rotary switch was
set to RUN correctly.
An "emergency operation" may have the following reasons:
•
The batteries of a wireless thermostat ("R-Tronic RT B / RTF B") are empty.
•
The radio communication between an "R-Tronic" device and the control
module of the wireless receiver is interrupted by an interference source.