Introduction; General Notes; Description - Siemens RWF40.000A97 User Manual

1.1 General notes

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1.2 Description

Use
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Please read this User Manual before switching on the controller. Keep the User Manual
in a safe place which can be accessed by all users at all times. Please help us improve
the information given in the User Manual. Your suggestions will be welcome.
All necessary settings and, where required, the settings to be made inside the unit, are
described in this User Manual (applicable to controller software version 126.01.01).
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Section 6.2.5 «Display software version and dimensional unit»
Should any problems arise during commissioning, do not make any unauthorized
manipulations on the unit. You could endanger your rights under the warranty terms!
Please contact us in such a case.
When returning modules, assemblies or components to HVAC Products, the regulations
as per DIN EN 100 015 «Protection of electrostatically sensitive devices» must be
observed. Always use the appropriate ESD packaging for transport.
Please take note that we cannot assume liability for damage caused by ESD.
ESD = electrostatic discharge
The RWF40... is used primarily for the control of temperature or pressure in oil- or gas-
fired heating plants. It is a compact modulating controller without position feedback
acting on the burner. An external switch can be used to change it to a 2-position
controller for the control of 2-stage burners. The integrated thermostat function switches
the burner on and off. The thermostat (relay output 1) can be used as a thermal reset
limit thermostat conforming to DIN 3440. An adjustable response threshold is used to
switch to a higher burner output (high-fire operation).
In modulating operation, the RWF40... operates as a PID controller.
In 2-stage operation, the RWF40... provides control based on the set switching
threshold. The setpoint of the RWF40... can be adjusted either on the controller itself or
externally. Minimum and maximum setpoint limits can be adjusted. A self-setting
function is provided as a standard feature.
The plug-in controller module measures 96 x 48 x 127.5 mm and is especially suited for
mounting in control panels. The controller features two 4-digit 7-segment displays for
the actual value (red) and the setpoint (green). A limit comparator is also provided; its
switching characteristic can be set on the configuration level.
A choice of 8 different limit comparator functions is available.
An RS-485 interface is provided for integrating the controller into a data network. Output
5 can be used as an analog output for modulating or 2-stage operation.
All connections are made via screw terminals at the rear of the unit.
CC1B7865en 05.12.2002

1. Introduction

HVAC Products