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Building Technologies Division User Manual RWF50... CC1U7866en
Infrastructure & Cities Sector 1 Introduction 25.07.2014
1.3 Description
The RWF50... is used primarily for the control of temperature or pressure in oil- or gas-
fired heating plants. Depending on the model, it is employed as a compact 3-position
controller without feedback of angular positioning or as a modulating controller with an
analog output. An external switch is provided to convert it to a 2-position controller for
controlling 2-stage burners. The built-in thermostat function switches the burner on and
off.
The controller’s operating mode can be changed from heating to cooling, or vice versa.
Reference!
See chapter 8.2 Controller Cntr.
The controllers feature two 4-digit 7-segment displays for the actual value (red) and the
setpoint (green).
The RWF50.2 has a 3-position output consisting of 2 relays to open or close a
controlling element.
The RWF50.3 has an analog output.
In modulating mode, the RWF50... operates as a PID controller. In 2-stage mode, the
RWF50... provides control based on the set switching threshold. Using the binary input,
a change to a second setpoint can be made or the setpoint can be shifted. Standard
feature is a self-setting function used to determine the PID control parameters.
The controller insert measures 48 x 48 x 104 mm and is especially suited for installation
in control panels. All electrical connections are made via screw terminals at the rear of
the unit.
Use in heating plants
Cooling controller
RWF50...
Control
Mounting
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