CE1B3073en / 05.06.2009 Subject to change Siemens Building Technologies
Operating Instructions
RDH10M
The RDH10M is a room thermostat with OpenTherm bus interface that allows you to set the desired room
temperature (setpoint) at the time you want. The unit features an ergonomic setting knob for ease of temperature
control.
Display
Actual room temperature in ºC
The unit controls to the selected
Comfort temperature
Indicates when there is demand for
heat / BMU reports ”Burner on”
Replace batteries
Rotary knob
Warmer / colder knob for
selecting the room
temperature setpoint
Battery compartment
2 alkaline batteries type AA, 1.5 V
Commissioning (optional when powered by OpenTherm bus)
•To prevent the room thermostat from powering itself off when Boiler Management
Unit (BMU) is switched off
•Remove the black transit tabs from the 2 alkaline batteries. Check to see if the
battery holder is in its correct position
•If no batteries are inserted, fit 2 alkaline batteries type AA in the battery
compartment
Initial power-up
After initial power up, all symbols appear on the
display for about 2 seconds.
Selecting the required temperature
•Turn the rotary knob counterclockwise to
decrease the setpoint, or clockwise to
increase it in increments of 0.5 °C
•The required room temperature is displayed
next to the Comfort temperature symbol
Error of Boiler Management Unit
(BMU)
If the display shows constantly Err, please
contact your nearest heating specialist.
Changing the batteries
1. Use 2 new alkaline batteries type AA, 1.5 V.
2. Within 1 minute: Remove the battery holder, then the batteries,
insert the new batteries and replace the battery holder.
3. Make certain the old batteries are disposed of properly,
in compliance with environmental requirements.
Energy saving tips without sacrificing comfort
•Never allow room temperatures to exceed 21 ˚C
•Air out rooms for short periods of time only, but properly, with the
windows wide open
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