User Manual

Technical data
OpenTherm bus
Connection
Length of cable
Resistance of cable
Power consumption
2 wires, interchangeable
Max. 50 m
Max. 2 x 5 Ω
35 mW (typical)
Power supply
Batteries (Alkaline AA)
Battery life
Backup for battery change
2 x 1.5 V
Approx. 2 years
Max. 1 minute
Battery data
Data backup (unit removed from base / no
batteries inserted)
User settings
Actual time (without batteries)
Approx. 10 years
Max. 1 minute
Data backup (unit re-
moved from base /
no batteries inserted)
Safety class
Degree of protection of housing
Pollution
III to EN 60730
when installed according to regulations
IP 20 to EN 60529
Environment to EN 60730
Safety data
Sensing element
Measuring range
Time constant
NTC 10 k
Ω ±1 % at 25 °C
0…50 °C
Max. 10 min
Setpoint setting ranges
Normal temperature
Economy temperature
Frost protection temperature
5…29 °C
5…29 °C
5...29 °C (factory setting 5 °C)
Resolution of settings and display
Setpoints
Switching times
Measurement of actual value
Display of actual value
Display of time
0.2 °C
10 min
0.1 °C
0.2 °C
1 min
Sensing element
various features
conformity
Electromagnetic compatibility
Low voltage directive
89/336/EWG
2006/95/EWG
Product safety
Automatic electrical controls for
household and similar use
EN 60730-1, EN 60730-2-9
OpenTherm Plus
(OT/+)
OpenTherm Product Specification 2.2a
OpenTherm Test Specification 1.2
Electromagnetic compatibility
Immunity
Emissions
EN 61000-6-1, EN 61000-6-2, EN50 090-2
EN 61000-6-3, EN 61000-6-4,
EN50 090-2-2
Norms and standards
12/14
Building Technologies Room temperature controller REA23M CE1N2217en
HVAC Products 17.04.2007