Fujitsu Super High Power Series Design & Technical Manual page 65

• Operating mode changeover
HC1
900
In case of an external changeover via input H2 (on the extension module only) the operating mode
to which the changeover will be performed must be previously defined.
• Heating circuit frost protection
The heating circuit frost protection is continuously activated (protection mode ) and is not ad-
justable.
– Heating circuit mode: If the flow temperature is below 5°C, the controller initiates the produc-
tion of heat and starts the heating pump, regardless of the current heating mode. If the flow tem-
perature rises again above 7°C, the controller waits another 5 minutes, and then stops the pro-
duction of heat and the heating pumps.
– Heating circuit frost protection in cooling mode: Refer to cooling mode.
3-4. Heating circuit 1 and 2 functions
Line
HC2
1200 Operating mode changeover
Function
- (03-21) -
3. Function table