Instructions

Table Of Contents
11
EN
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3.4 Glossary - definition
UW
UW = ultra-white (device colour)
DIN 49075
German Standard "Cover panels for installation devices for
building into device boxes..."
2014/53/EU
European Radio Equipment Directive
ELV
Extra low voltage
Electrothermal control valves
Electrothermal valves with the switching states "normally closed
(NC) or normally open (NO)" are often used for heating control.
You can set the respective valve mode on the DuoFern Room
Thermostat 2 to adapt to the control valve used in each case.
Valve mode NC (normally closed)
The control valve remains closed in an isolated,
de-energised state
Valve mode NO (normally open)
The control valve remains open in an isolated,
de-energised state