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?
Stadtvilla19 schrieb:
All heating circuit manifolds are open; you can even feel a slightly warm floor in the bathroom, for example. The Viessmann system includes a 170-liter (45-gallon) buffer tank. There is nothing more... The 170 liters (45 gallons) refers to your domestic hot water; the buffer tank is a white box installed in the heating return line.
neo-sciliar schrieb:
The message "supply temperature too low" is confusing me. Possibly there is still air trapped in the underfloor heating. I think the message refers to the supply side of the brine circuit. That also makes sense with the negative temperatures.
S
Stadtvilla1930 Sep 2020 12:52Oh, we don’t have an additional white box, so probably no buffer tank.
Yes, the primary circuit is the ground loop, right? It says the supply temperature is too low.
Yes, the primary circuit is the ground loop, right? It says the supply temperature is too low.
The short cycles suggest that the heat pump is unable to transfer the heat away and that the circuits are closed. However, this does not explain why the heat pump is pushing so much heat into the heating circuit under these weather conditions. The Viessmann heat pump is controlled by the outdoor temperature and return temperature. What does the outdoor temperature sensor indicate?
N
neo-sciliar30 Sep 2020 13:45Heinz2k schrieb:
The short cycles indicate that the heat pump is not able to transfer the heat properly and that the circuits are blocked. However, this still doesn’t explain why the heat pump pushes so much heat into the heating circuit under these weather conditions. The Viessmann heat pump is controlled by outdoor temperature and return temperature. What does the outdoor temperature sensor say?And what is the return temperature from the heating circuit, both actual and target?S
Stadtvilla1930 Sep 2020 14:09You can already feel that the floor is slightly warm, especially in the bathroom where a higher temperature has been set.
The outdoor temperature sensor currently shows 18°C (64°F), but it is corrected by -1.5°C (3°F). The flow and return temperature of the heating system are currently 24°C (75°F). However, the system has not been running for a while since I switched off the cooling circuit....
The outdoor temperature sensor currently shows 18°C (64°F), but it is corrected by -1.5°C (3°F). The flow and return temperature of the heating system are currently 24°C (75°F). However, the system has not been running for a while since I switched off the cooling circuit....
The heat pump has a fixed temperature differential of 5°C (9°F) plus two adjustable values for the hysteresis of the return temperature (standard set to -2°C (4°F) for compressor ON and +2°C (4°F) for compressor OFF).
Example heating curve at 30°C (86°F) supply temperature setpoint with 10°C (50°F) outside temperature:
Compressor ON at 23°C (73°F) return temperature
Compressor OFF at 27°C (81°F) return temperature
Example heating curve at 30°C (86°F) supply temperature setpoint with 10°C (50°F) outside temperature:
Compressor ON at 23°C (73°F) return temperature
Compressor OFF at 27°C (81°F) return temperature
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