4
Functionality
•
The ATR-4 electronic clock thermostat records the room temperature ei-
ther using an internal NTC temperature sensor or an external KTY tem-
perature sensor.
•
The output is activated via an isolated change-over contact.
•
The digital weekly clock timer controls temperature in automatic mode
(comfort temperature or cooling temperature). It has 16 programs that can
be used to program up to 112 activation times. The timer has a power re-
serve of 15 minutes.
•
The mode can be selected using the program buttons (4): Automatic,
Heating, Cooling, Frost Protection and Off modes are available.
•
An indicator (5) on the left-hand side of the display shows the operating
mode.
Comfort Temperature
The desired comfort temperature (5 to 40 °C) is set on the upper rotating
knob (2). It is displayed on the right-hand side of the display instead of the
current temperature. Three seconds after the knob has been turned, the unit
automatically displays the current temperature again.
Operating Controls
1. Reset button
2. Adjustment wheel (Comfort temp.)
3. Adjustment wheel (Cooling temp.)
4. Program buttons
5. Operating status indicators
6. Operating mode indicators
G
Note:
A change to the comfort temperature makes it necessary to
change the cooling temperature by the same amount because
the cooling temperature is relative to the comfort temperature.
Conversely, a change in the cooling temperature does not re-
quire a change in the cover temperature.
