11
Heating
Heating function
The heating function is activated when the temperature of the return air matches the
setting defined using the knob on the front of the control unit (Learn more about this in
section ”Set points”, page 12).
It will be deactivated when the return air temperature exceeds this setting by 3 °C.
The fan speed will be fixed to 50 % when the heating element is activated.
Power consumption is monitored, and if it falls below 3 A, it will be considered an error.
This will be indicated via the error relays. See the section entitled “Fault finding guide”,
page 38 for additional details. However, a simultaneous AC power failure will result in
this error being rejected.
In the event of a fan error, the heating element will not be activated as in this case it will
not be possible to ensure the required airflow to the heating element.
A signal from a smoke detector (accessory) will cause immediate deactivation of the
heating element.
If you choose not to use the heating element, this function and the associated
monitoring process can be deactivated. This can be done via the serial communication
set-up and the setting will be saved in the control unit.
Return air temperature
2.0 • 01.12.2004
910002 • Version
