5
Output variables
The following values are sent from the CORA-HKT to the connected device (not changeable):
Error codes
Every error state has a number assigned to it. The sum of the codes of all active errors is displayed
under „error code“.
Example:
An error code of
6
means that errors
2 and 4
are active.
Timeout
Digital value
Yes/No
(Yes, if connection lost)
Battery charge
Battery charge 0-100%
Eff. room temp.
The room temperature used for calculations.
• If a value is connected to
room temp.
, that value is output here.
• If no value is connected, the measured temperature (
HKT room temp.
) is
output.
HKT room temp.
The room temperature is estimated based on two internal sensors.
Current position
Current position of the thermostat motor
0% = fully closed
100% = fully opened
The „fully opened“ position is defined by the initialisation run (see page 3),
„Fully opened“ depends on the valve of the radiator.
Window contact
Digital value Yes/
No (Yes = win
-
dow closed)
Based on the room temperature (always according to internal sensors), the
device tries to detect the opening of a nearby window.
If the room temperature drops...
• by 0.2°C every minute over a span of 3 minutes
•
or
by 0.5°C over the span of one minute
the window contact switches to
No
(= window open)
To switch back to
Yes
(= closed) the temperature has to rise
• by 0.1°C every minute over a span of 3 minutes
•
or
by 0.25°C over the span of one minute
The window contact always switches back to Yes (= closed) 60 minutes after
initial opening.
Error code
If a malfunction of the CORA-HKT is detected, the appropriate error codes are
displayed here.
1
Battery charge low (<5%)
2
An error occurred during actuation of the motor.
4
Valve not found during initialisation run
or
initialisation run failed due to low battery.
