Hi guys,
I have split altherma 8kW, only floor heating, temperature setpoint ab. 29deg.
The weather is like it is, 0deg and foggy. Pump does defrost appr. every 30min. What I am concerned about, very often pump is running with very low COP<1.6, for ab 15-30min, then COP gets higher, for another 5-15min, then it makes defrost operation. In most cases this seems to be very periodic, every second working cycle (between defrosts). So is running well with COP > 3.5, whole cycle, making defrost, running very bad for 15-30min with COP<1.6, then something happens, it runs well with COP>3.5 for 5-15min, does defrost, work well, does defrost, work bad etc…
Sometimes it happens every working cycle, but most often every second cycle.
See attached graph with consumed and generated energy.
Any ideas what happens? As a result my daily COP is very low, ab 2.5(!).
It looks quite similar to this issue. AFAIK it was never resolved:
Thanks @alibloke , seems having same origin…
I had similar issues myself, but luckily it seems to have gone. One theory was that liquid was getting back into the compressor somehow, but nothing has ever been verified or confirmed by Daikin.
I am trying to get support from Daikin. Last year when I noticed problem for the first time they send technician for verification, he did some checks, but weather conditions were very good at that time, +10deg and dry. Most likely he was not able to force the problem to appear - to have right data for analysis. He told me there is some issue, replaced mainboard and 4way valve in outdoor unit. That was end of last winter, problem appeared only 2-3 times. But also weather conditions were better.
Since last week is getting terrible again, and same technician is telling me that is normal behaviour of pump. Last winter he sent logs to service center and it turn out that parts he replaced were OK, replacement was not necessary.
Hello, how do you get the energy generated data? I can’t see it in Onecta / Home Assistant integration.
Thank you
Looks like they’re using ESPAltherma - an addon module which plugs into the outdoor unit and is polled from Home Assistant.
Hello @Jan_Mikes as written by @chrisg I am using ESPAltherma + home assistant.
Hi Seb,
I have the same phenomena wich a 8kw