Hello dear community!
The outer part has a plug for the condensation water. If I don't remove it, so much water collects that the fan bathes in it and makes a lot of noise or splashes. If I pull the plug, I solve the problem and the condensation runs off. I can't find anywhere in the instructions whether the plug should be removed or not. Does the outdoor unit need a little water to cool better or whatever, or can I safely leave the plug out? Thank you very much for your help!

Question

Hello dear community!
The outer part has a plug for the condensation water. If I don't remove it, so much water collects that the fan bathes in it and makes a lot of noise or splashes. If I pull the plug, I solve the problem and the condensation runs off. I can't find anywhere in the instructions whether the plug should be removed or not. Does the outdoor unit need a little water to cool better or whatever, or can I safely leave the plug out? Thank you very much for your help!

Accepted Answer

If the splashing is acoustically disturbing, you can remove the plug, otherwise I would leave it in.

The condensation water from the interior is pumped into the outer part, where it collects at the bottom (often referred to as a "sump" or "trough" in other areas of technology).
The fan has a kind of integrated water wheel, which flings the water from the sump/tub against the fins of the heat exchanger (or just "splashes").

Water has a very strong tendency to evaporate, and to do this it withdraws the necessary enthalpy from the fins of the heat exchanger (see https://de.wikipedia.org/wiki/Verdampfungsenthalpie). On the one hand, this ensures that the water does not simply end up in the drain (or wherever the waste water from your outdoor part goes), but a) evaporates 100% and b) "incidentally" makes the outdoor part much more efficient.

If you have an ammeter, here's a practical experiment:
Hook up the Ulisse to an ammeter (e.g. a Shelly1PM or something). Let the Argo run for an hour until it settles down. Take a simple pump spray bottle for spraying water, and wet the outer part with 1-2dl of water (on the inlet side, not on the fan side). The system immediately regulates the consumption downwards, because it suddenly gets rid of much more heat via the outdoor part. Fogging in once pushes the consumption down by about 200-250W for almost a minute.

This splashing saves you electricity!

It would save more electricity if the water were distributed on the air inlet side, but the "water wheel" integrated in the fan saves a separate pump.

Answer

I had not found any information on this either, but I would bet that the plug is only used for transport so that no water runs out. Stagnating the water during operation and causing this rather loud splashing makes no sense. Our air conditioner has been running without the plug since last summer.

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