8
Changes (‘Window open’ or ‘Window closed’) are signalled to the heating control within a time
period of about 1 minute. This allows the heating control to adjust the temperature after an
average of 30 seconds, in order to save energy when a room is aired, for example.
b) Security code
The radio signal is protected by a two-part security code This security code protects the system
against interference from other radio systems and ensures that several radio-controlled
radiator thermostat systems can be operated separately in a household.
Each part of the code comprises 100 setting options. This means that a total of 10,000 different
security codes are available.
To ensure communication between the heating control and the valve operating mecha-
nism/s the same security code has to be set for all devices in a room.
A random security code is set by the manufacturer.
When supplied as a set (heating control and valve operating mechanism) the valve
operating mechanism is preset to the heating control’s security code.
If you purchased the heating control and valve operating mechanism separately (or
you want to use additional valve operating mechanisms for a heating control), then
the security code has to be transmitted to each of the valve operating mechanisms.
See section 13 d) or section 13 e).
The security code is also used for communicating with the ‘FHZ1000’ central unit.
The ‘FHT80TF-2’ door/window contact sensors are equipped with a randomly generated
factory default code that cannot be changed. Since over 16 million different codes are possible
for the ‘FHT80TF-2’, changing the code is not necessary.
Duplication is virtually impossible.
