For proper defrosting of the outdoor unit, the minimum return water temperature
and the minimum temperature in the accumulation tank are set at 20°C
2.5.3 Adverse climatic conditions
With very long lasting high air humidity and temperatures just below zero, the grid and
surroundings in the fan can be frozen. It's not a malfunction, it's a physical phenomenon. It may
be necessary to temporarily stop the heat pump with the main circuit breaker and remove the
frost very carefully mechanically.
2.5.4 Summer/winter switching
In summer, the heat pump switches on when the system is equipped with:
• service water heating and the service water temperature drops below the set value
• an accumulation vessel enabling service water preheating, and the variant of preheating
in summer is selected - then the temperature in the accumulation vessel is maintained
at 45 °C.
The summer/winter mode is switched according to the set average outdoor
temperature. The average outdoor temperature is calculated as the average of
the morning, noon and evening outdoor air temperatures over the past 3 days.
3. Heat pump control
Control of the heat pump is possible:
1. using an internet browser via www.acond.cz in the case of connection of the heat pump
control to the Internet – chapter 17
2. via direct connection at the installation site in the local network - chapter 3.2.2.3
3. through the indoor unit in the reference room - chapter 13
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