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2. Application / functional description / emergency operation
The controller described in these instructions is provided for flush installa-
tion and has been specially devised for the time-dependent control of the
temperatures in individual rooms or of the temperatures produced by elec-
tric or warm-water heating systems (systems with normally closed valve
actuators). The device can be used as floor or as room temperature controller
with additional floor temperature controller function. Operation in emergency
mode is triggered if the internal or external sensor is defective. The same
applies if no sensor has been connected when using the device as room
temperature controller with additional floor monitoring function and also
when using it as floor temperature controller. An error message appears on
the display and an indicator lamp starts blinking red to indicate this condi-
tion. During operation in emergency mode a fixed 30% duty cycle is being
maintained to prevent the related room from cooling down thoroughly and
protect it against frost damage. The activation time divides into a 3-minute
ACTIVE and a 7-minute OFF time.
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