Back-up operation if an error occurs on the outdoor unit
In case of an error on the outdoor unit, the electrical back-up starts
immediately to guarantee heating comfort.
Back-up operation when defrosting the outdoor unit
When the outdoor unit is defrosting, the control unit ensures the protection
of the system by starting up the back-up if necessary.
If the back-up is not sufficient to ensure outdoor unit protection during
defrosting, then the outdoor unit is switched off.
Operation when the outdoor temperature falls below the
operating threshold of the outdoor unit
If the outdoor temperature is below the minimum operating temperature of
the outdoor unit as defined by the Min. Outdoor T. HP (HP051) parameter,
the outdoor unit is not authorised to operate.
Tab.88
Access
Parameter
Description
Value
23.5
Air Src Heat
pump >
Parameters,
counters, signals
> Adv.
Parameters
Min. Outdoor T.
HP (HP051)
Minimum outdoor temperature for the heat
pump to shut down.
-15 °C for 4.5 kW
-15 °C for 6 kW
-20 °C for 8 kW
9.5.2
Running the back-up in domestic hot water mode
Start-up conditions for the back-up
The start-up conditions for the back-up producing domestic hot water are
described in the following table.
9 Settings
78
7762758 - v05 - 19082020
