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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Stadtvilla1930 Sep 2020 11:35The head of our company knows or knew Mr. Waterkotte personally... And Waterkotte is practically the inventor of the whole system, so we actually thought we had found a good company. They do have expertise in this entire subject.
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Stadtvilla1930 Sep 2020 11:55So, I have now turned off the cooling. Let’s see what effect that has.
And here are a few pictures, maybe they are helpful.
And here are a few pictures, maybe they are helpful.
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neo-sciliar30 Sep 2020 12:00139 hours at 1100 cycles is definitely too short. This will "kill" your compressor. It’s not the running time that causes wear, but the start-up cycles. For comparison: my heating system is now in its third winter and has 2700 starts with 2300 operating hours.
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Stadtvilla1930 Sep 2020 12:21All heating circuit distributors are open, which can be noticed, for example, by a slightly warm floor in the bathroom. The Viessmann unit includes a 170-liter (45-gallon) buffer tank. There is nothing more.
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neo-sciliar30 Sep 2020 12:32Is the heating circulation pump (HUP) running at full capacity or reduced speed?
What is the flow rate in the underfloor heating (UFH) manifold?
Your heating system is generating quite a lot of heat. In my opinion, so much that your brine line is freezing because it cannot keep up with the heat extraction. There might also be air bubbles present, but the primary issue is the brine water heat pump.
The message about the supply temperature being too low is confusing to me. It’s possible that there is still air trapped in the underfloor heating system. If you have automatic air vents, you can run the venting program.
What is the flow rate in the underfloor heating (UFH) manifold?
Your heating system is generating quite a lot of heat. In my opinion, so much that your brine line is freezing because it cannot keep up with the heat extraction. There might also be air bubbles present, but the primary issue is the brine water heat pump.
The message about the supply temperature being too low is confusing to me. It’s possible that there is still air trapped in the underfloor heating system. If you have automatic air vents, you can run the venting program.
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