Max Diff Kompressor med buffer tank
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I recently moved in a 2 floors villa in south Stockholm built 2012, 170sqm, heated with F1245-6 bergvärmepump, with a UKV 100 in buffer configuration (heated water goes in from the top, colder water from the bottom goes out - no extra circulation pump after) and golvvärme on both floors.
Since we moved in we noticed that the house was not warming up, but the compressor worked correctly and we had warm house water. We did a service a month ago during which the software was updated, and the circulation pump was replaced.
After that, the heating started working, but very slowly. On cold mornings, the house would still be cold and, as soon as the snow arrived and temperature dropped, the house became very cold.
Changing the curve wouldn't make a difference. Below zero outside, the calculated framledningstemp is always 45, the max allowed for this floor, and the return water temp was around 25. The Degree minutes would quickly drop to -60, the compressor would start, quickly warm the water that flows into the buffer tank to 55 degrees and stop. It would run for only 2 or 3 minutes before stopping because of the temperature difference between calculated and actual reaches 10 degrees. Not long enough to warm up the water in the system. So lot of short cycles, not ideal. Compressor is set to go 80% on wait, and goes to 100% when the compressor is running.
The solution I found is to increase the max diff. compressor (setting 5.1.3) to 20 degrees and increase the compressor start at -150 degree minutes. This finally gives time for the compressor to warm up the water for the whole duration of the cycle. Within two cycles, the water flowing out of the buffer started to finally warm up. I've been running for 4 days like this (and tonight was well below zero) and the water flowing out of the buffer tank into the floors is stable between 35-38 degrees, and the return water ~10 degrees less, and house is stable 22+ degrees.
I'm looking for confirmation that these settings are outputs are fine for my setup.
I'm not sure how it was working before I moved in, maybe the software update reset something?
Tack!!
I recently moved in a 2 floors villa in south Stockholm built 2012, 170sqm, heated with F1245-6 bergvärmepump, with a UKV 100 in buffer configuration (heated water goes in from the top, colder water from the bottom goes out - no extra circulation pump after) and golvvärme on both floors.
Since we moved in we noticed that the house was not warming up, but the compressor worked correctly and we had warm house water. We did a service a month ago during which the software was updated, and the circulation pump was replaced.
After that, the heating started working, but very slowly. On cold mornings, the house would still be cold and, as soon as the snow arrived and temperature dropped, the house became very cold.
Changing the curve wouldn't make a difference. Below zero outside, the calculated framledningstemp is always 45, the max allowed for this floor, and the return water temp was around 25. The Degree minutes would quickly drop to -60, the compressor would start, quickly warm the water that flows into the buffer tank to 55 degrees and stop. It would run for only 2 or 3 minutes before stopping because of the temperature difference between calculated and actual reaches 10 degrees. Not long enough to warm up the water in the system. So lot of short cycles, not ideal. Compressor is set to go 80% on wait, and goes to 100% when the compressor is running.
The solution I found is to increase the max diff. compressor (setting 5.1.3) to 20 degrees and increase the compressor start at -150 degree minutes. This finally gives time for the compressor to warm up the water for the whole duration of the cycle. Within two cycles, the water flowing out of the buffer started to finally warm up. I've been running for 4 days like this (and tonight was well below zero) and the water flowing out of the buffer tank into the floors is stable between 35-38 degrees, and the return water ~10 degrees less, and house is stable 22+ degrees.
I'm looking for confirmation that these settings are outputs are fine for my setup.
I'm not sure how it was working before I moved in, maybe the software update reset something?
Tack!!