RDF20U
Technical Instructions
Document No. 155-334
September 27, 2007
Room Temperature Controller
with LCD for Two-Pipe Fan Coil
Units with Electric Heat
Siemens Industry, Inc.
Description
Room temperature controller with LCD for two-pipe fan coil units with electric heat.
Features
•
Output for an on/off valve actuator
•
Output for electric heat.
•
Outputs for a three-speed fan.
•
Control depending on the room or the return air temperature.
•
Automatic heating/cooling changeover.
•
Operating modes: Normal, Economy and Standby.
•
Operating mode changeover input for remote control (Day/Night).
•
Air movement control function for avoiding damage resulting from moisture.
•
Selectable installation and control parameters.
•
Display of room temperature or setpoint (selectable).
•
Electronic minimum and maximum setpoint limits.
•
Operating
voltage 24 Vac.
Application
Typical use:
•
Control of the room temperature in individual rooms that are heated or cooled with
two-pipe fan coil units equipped with electric heat.
•
Opening or closing a valve.
•
Switching electric heat.
•
Switching a three-speed fan.
Suitable for two-pipe fan coil unit systems with:
•
Automatic heating/cooling changeover.
•
Continuous heating or cooling mode.
Product Number
RDF20U
