User Manual

Functions
• Delivery of the flow temperature setpoint
• Pure room temperature control
• Permanent self-learning PID control for normal and fast control loops
• 2-position control for difficult controlled systems
• Automatic mode with 7-day switching program for 24-hour, working day, weekend or
7-day operation with up to 3 heating periods per day
(4
th
priority for actual valid temperature setpoint)
• Integrated 7-day time switch
• One temperature setpoint for each heating period
• One 24-hour operating mode with one heating period
• Remote operation (1
st
priority for actual valid temperature setpoint)
• Override button (3
rd
priority for actual valid temperature setpoint)
• Sensor calibration and reset function
• Frost protection function
• Limitation of the minimum setpoint
• Holiday mode (2
nd
priority for actual valid temperature setpoint)
• Optimum start control for the first heating period
• If provided by the boiler, alternating display of: relative modulation level, flow tem-
perature, outside temperature and DHW setpoint
• If provided by the boiler, display of error code in case of error
• Transmitting of actual operating mode to a Siemens boiler management unit
(refer to user guide of boiler management unit)
Ordering
Room temperature controller with 7-day time switch REA23M
When ordering, please give the type reference.
The controller is supplied complete with batteries.
Technical design
Communication
The OpenTherm bus is used for communication between room temperature controller
and boiler control. The REA23M can only be used in combination with an
OpenTherm Plus boiler.
OpenTherm Plus affords reading and writing of several compatible standard objects
between room temperature controller and boiler control via the bus.
Immediately after installation, the room temperature controller examines if the con-
nected BMU supports the OpenTherm Plus protocol. If OpenTherm Plus is not sup-
ported, error message
will be displayed.
Display and
operating elements
+
ESC OK
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Building Technologies Room temperature controller REA23M CE1N2217en
HVAC Products 17.04.2007