ᐅ Air-to-Water Heat Pump: Current Consumption and Data

Edit: The heat pump has now been running for 7 hours, but after 2 hours it starts up again??? Heating curve 25.5/20.5/0.
On the ground floor, the temperature is almost 24.8°C (76.6°F) — exactly like the tile floor — and the damn thing is turning on again. This can’t be right!!!

This can only be explained by a thermal short circuit that pumps cold water back.

How do I find it?

The only thing I changed the day before yesterday was increasing the flow from 1.75 to 2 in a child's room for a radiator with 94m (310 ft) of pipe. So nothing unusual.

Can you measure the return flow to see if it is really 22°C (72°F)? Also, please measure the individual circuits to possibly find the short circuit.

However, I suspect that the cold return flow is coming from the basement, which is now switched on.

With a flow temperature of 25.5°C (78°F), you can’t achieve 24.8°C (76°F) return temperature with the current outdoor temperature. As I said, something doesn’t add up at both ends. And as far as I can tell, it’s also an AIT or Novelan system.

In your photo, the flow temperature is almost 34°C (93°F)! No wonder – I’ve never seen such a high flow temperature before. Do you have a parallel shift applied? I would check on that. With such a flat heating curve, you wouldn’t otherwise get such a high flow temperature.

Everything seems very suspicious.

Measure and record the return pipes with an IR thermometer every 2-3 minutes. If any of them stand out, reduce it.

The IR thermometers available for 15 euros each on eBay are sufficient.