We have been using our Viessmann heat pump for a few weeks now. So far, it only needed to provide cooling and hot water, but now that the nights and days are getting colder, we noticed that the ground loop pipe has developed a thick layer of ice, especially in areas where there is little or no insulation on the pipe. During the day, the ice melts and drips, making the floor wet.
I thought this was due to insufficient insulation, and that fully and properly insulating the pipes should solve the problem. However, I recently read that while insulation may help prevent icing, it doesn’t address the root cause, and that this kind of ice buildup isn’t normal. Does anyone have experience with this?
I thought this was due to insufficient insulation, and that fully and properly insulating the pipes should solve the problem. However, I recently read that while insulation may help prevent icing, it doesn’t address the root cause, and that this kind of ice buildup isn’t normal. Does anyone have experience with this?
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neo-sciliar30 Sep 2020 14:15Stadtvilla19 schrieb:
You can definitely feel that the floor is slightly warm, especially in the bathroom where a higher temperature is set.
The outdoor temperature sensor currently reads 18°C (64°F) but is adjusted by -1.5°C (3°F). The supply and return temperatures of the heating system are currently at 24°C (75°F). However, the system hasn’t been running for a while since I switched off the cooling circuit....Maybe a simple question: What are the target temperature values for the return flow during heating operation and for cooling operation?S
Stadtvilla1930 Sep 2020 14:43That’s a good question that I unfortunately can’t find an answer to. I can’t find the return setpoint in the menu.
After more than a 2‑hour pause, the system ran briefly for a few minutes. I took some pictures, maybe they help...
After more than a 2‑hour pause, the system ran briefly for a few minutes. I took some pictures, maybe they help...
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neo-sciliar30 Sep 2020 14:52Observe the heating system and its behavior after you have turned off the cooling. Previously, the heating cycled approximately every 20 minutes. How is it now? Is it possible that the cooling and heating were interfering with each other? When I look at your operation log and see that the system both heated and cooled within the same week, something doesn’t seem right. I mean, if you raise the screed temperature to 25°C (77°F) and then immediately cool it down again so the heating has to raise it again, I understand why the compressor runs so much and where your heat is going – namely into the cooling.
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Stadtvilla1930 Sep 2020 14:54I have uploaded a few more pictures. The week with heating and cooling could be because at the beginning of the week we still had 28°C (82°F) and sunshine, and by the end of the week only 10°C (50°F) and rain. Maybe that’s the reason?
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neo-sciliar30 Sep 2020 14:59Stadtvilla19 schrieb:
I have uploaded a few more pictures. The week with heating and cooling might be because at the beginning of the week we still had 28°C (82°F) and sun, and at the end of the week only 10°C (50°F) and rain. Maybe that’s the reason? The new photos look better already. I assume you only take pictures while the compressor is running, right? Temperature readings during heating system standby are not meaningful.
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Stadtvilla1930 Sep 2020 15:10Yes, only when it runs. It ran for a maximum of 5 minutes, but as I said, since the cooling has been off, the compressor hasn’t run for over 2 hours now...
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