Siemens RWD68U Technical Instructions

RWD68U
Universal Controller
Description
Features
Product Number
The Universal Controller is intended for heating, air conditioning, ventilation and
refrigeration in comfort control applications. RWD68U main loop control applications
are designed for temperature, static pressure, humidity, air pressure, fluid pressure,
refrigeration, air quality and air fluid velocity control. The controller contains pre-
programmed applications.
Auxiliary control functions include:
• Day/night setpoints
• Remote setpoint control
• Limiter control
• Cascade control
• Maximum priority
• Setpoint compensation
• Summer/winter operation
Control parameters are adjusted for maximum comfort control via three buttons on the
face of the device, or with a laptop computer and Siemens Building Technologies
program software.
NOTE: For complete supporting technical documentation, including training
presentations, see www.us.sbt.siemens.com/hvp/components.
• Stand-alone electronic temperature controller with P or P+I response
• 24 Vac operating voltage
• Control application selectable via Application Number
• Active input scale can be selectable
• Limit and direction of the output scale can be freely assigned
• Two universal inputs for Siemens 1000 ohm nickel (Ni 1000), 1000 ohm platinum
(Pt 1000) temperature sensors and 0 Vdc to 10 Vdc signals
• Unit can be set as °F, °C, % or no specified unit
• One modulating 0 to 10 Vdc signal output, direct or reverse action
• One two-position output, direct or reverse action
• One digital input for day/night changeover
• Entering or changing of all data via operating buttons on the controller, is possible
without additional tools
• Computer connection for downloading pre-programmed applications via the
software tool
RWD68U
Technical Instructions
Document No. 155-738
January 14, 2005
Siemens Building Technologies, Inc.