Daikin Altherma HT - Outline of Control (Indoor Unit); Freeze Prevention

Outline of Control (Indoor Unit) ESIE09-08B
62 Function
6. Outline of Control (Indoor Unit)
6.1 Freeze Prevention
Freeze-up
Prevention by
Thermo Off
Condition
The freeze-up prevention is only active when the unit is in thermo OFF condition.
[Start condition]
AND/OR*:
 Outdoor ambient temperature < 4°C
 Leaving or return water temperature < 7°C
* AND/OR depending of setting [8 - 04] for further details see chapter of setting.
[Operation]
Pump will operate and if leaving OR return water < 5°C for 5 minutes, the unit will start up the
freeze-up prevention function to prevent too low temperatures.