ᐅ How to Properly Adjust an Air-to-Water Heat Pump with Underfloor Heating

Created on: 15 Dec 2019 16:52
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M4rvin
Hello,
I have been searching around and reading the manual for my Elco air-to-water heat pump, but I haven’t fully figured it out yet...

I have a manifold on the ground floor and first floor; the recommendation is to fully open everything, set all thermostats to maximum, and then adjust the heating curve on the heat pump low enough to roughly achieve the desired temperature.
Is that more or less correct?

At the moment, every thermostat (except bathroom/bedroom) is set to 20°C (68°F), and the temperature in each room is about 20.9°C (70°F) (bathroom slightly warmer, bedroom slightly cooler).
However, I’m surprised by the high electricity consumption — it has been 800 kWh in just 2 months.

135 m² (1455 sq ft) living area
Elco Split 7 kW
Circulation pump not yet connected

Thanks in advance
M4rvin
M4rvin26 Jan 2020 10:36
Just noticed this... Is it normal?

Outdoor air conditioning unit with fan grille, mounted on a concrete floor; steam rising from the ground next to it.
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boxandroof
26 Jan 2020 10:41
How is the drainage for the heat pump planned?

If no defrost water accumulates inside the unit and the drainage path from the heat pump itself remains clear, it’s not a big issue initially. But usually, that’s not the case; the water should also be directed away from the house.

Is the drain simply not yet connected to the drainage system? It looks like a PVC pipe (commonly used for underground drainage) still needs to be connected at the front, but it’s not visible in the picture. If that’s the case, I would first enlarge the hole where the small ice patch currently is so that water can drain over a larger area and doesn’t freeze up to the heat pump.
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guckuck2
26 Jan 2020 11:00
The outdoor unit usually has a condensate drain. Currently, it just drains onto the sloped ground, but this will likely change. It will either be connected to the drainage system or directed into a gravel bed for infiltration. The amount of water is not an issue right now, just a small puddle. It actually rains more here in two minutes. No need to worry.

The heat pump itself should defrost to operate efficiently.
M4rvin26 Jan 2020 11:27
I’m not sure how the drainage is planned; for me, the main concern is all the ice on the unit itself!

Construction site: large control cabinet on foundation, with brown pipes and pink insulation boards in front.
tomtom7926 Jan 2020 12:45
A heat pump works like a reversed refrigerator, so during defrosting, the melt water has to go somewhere. I think this is normal; at a neighbor’s house with an outdoor unit, it always looks like that.
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boxandroof
26 Jan 2020 16:26
I rarely get ice on the unit itself, only on the exchanger, but depending on the weather, that’s probably normal and it will thaw eventually.