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8. Maintenance and Repair
RAMSES 850 OT is maintenance-free. Only clean the device with a
dry or slightly damp, soft and lint-free cloth. The interior of the
device must remain free from water.
9. Disposal
At the end of its life, the room thermostat must be dismounted pro-
fessionally and disposed of according to the national regulations
with regard to the environment. In case of doubts, please contact
the manufacturer’s representative in your country. Contact details
can be found at the back of this manual.
10. Technical data
Control type: Modulating controller, operates with
the OpenTherm protocol
Accuracy: ±1 sec. per day by 20 ˚C
Control accuracy: ±0,2 K
Temperature meas. range: 0 ˚C to 50 ˚C, resolution 0.1 ˚C
Temperature setting range: 6 ˚C to 30 ˚C in increments of 0.2 ˚C
Memory spaces: 32 temperature changes, programma-
ble for Mo-Fr, Sa-Su, each day or for
individual days
Class of protection: II according to EN 60730-1
Type of enclosure: IP 20 according to EN 60529-1
Power reserve: 4 hours
7. Delivery / Software Reset
With the buttons ESC and OK, you can reset the factory delivery
settings of RAMSES 850 OT. By pressing the buttons ESC and OK
simultaneously for a longer time (about 2 sec.), a selection menu
appears. Two types of software reset are available.
Following values are reset:
Software reset step 1:
Target temperature (comfort): 21 °C
Target temperature (reduction): 15 °C
Target temperature (antifreezing): 10 °C
Heating curve starting point: 25 °C
Heating curve end point: 75 °C
Reduction saving mode: –25 K
Holiday program: deleted
Heating program P3: deleted
Household water program P3: deleted
Hot water immediately: reset
Display: 1
In step 1, time and language settings are not affected.
Software reset step 2 (additional to step 1):
Time: 12:00
Language: German
Date: reset
