Ämne: Daikin Altherma avfrostar varje 25 minut

[Findefroster]

Hej,

Greetings from Finland. My Swedish is a bit limited, so I prefer to write in English rather than trying to use a translator.

I have Daikin Altherma ERLQ006CAV3 and EHVH08S26CB9W system, which is heating the water for underfloor heating. I have noticed that when the outdoor temperature goes below zero degrees, the outdoor unit starts to defrost every 25 minutes. This happends regardless of the outdoor unit condition. When the outdoor air is dry, the output from the defrost may be only a couple of drops of water. This behaviour seems ridiculous. I have found a couple of other discussions about this topic, but so far no success in fixing the assumed issue.

Attached is one temperature measurement from one of the refridgerant lines. You can see that defrost occurs precisely after 25 minutes of heating. At that time the outdoor temperature was -10 degrees.

Are any of you having similar experiences with Daikin air to water heat pump systems?

The other discussions are below:
https://lamiacasaelettrica.com/daikin-defrost-a-conscious-choice/
https://www.kaelte-treffpunkt.de/viewtopic.php?t=4771

[Daikin_]

You have a CB version, Contact your installer about this.
Daikin logic is such that it prevents defrost for at least 25 minutes. That means that your system is asking for a new defrost when last defrost is finished. But timer prewents an defrost for the following 25 minutes.
I would guess refrigerant shortage or sensor fault.

This is nothing normal, bear in mind more than 300.000 Althermas installed in Europe.

Best regards
Daikin

Hej,

Greetings from Finland. My Swedish is a bit limited, so I prefer to write in English rather than trying to use a translator.

I have Daikin Altherma ERLQ006CAV3 and EHVH08S26CB9W system, which is heating the water for underfloor heating. I have noticed that when the outdoor temperature goes below zero degrees, the outdoor unit starts to defrost every 25 minutes. This happends regardless of the outdoor unit condition. When the outdoor air is dry, the output from the defrost may be only a couple of drops of water. This behaviour seems ridiculous. I have found a couple of other discussions about this topic, but so far no success in fixing the assumed issue.

Attached is one temperature measurement from one of the refridgerant lines. You can see that defrost occurs precisely after 25 minutes of heating. At that time the outdoor temperature was -10 degrees.

Are any of you having similar experiences with Daikin air to water heat pump systems?

The other discussions are below:
https://lamiacasaelettrica.com/daikin-defrost-a-conscious-choice/
https://www.kaelte-treffpunkt.de/viewtopic.php?t=4771