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TECHNICAL ARTICLE

A capacity figure only means something with its condition

You can see two different kW figures for the same unit in two different catalogues, and both can be right. The difference is not in the equipment but in the condition the figure was measured at.

Date
30 July 2026

Capacity is not a single number

An evaporator's capacity changes with the room temperature, the evaporating temperature and the difference between the two. On a condenser the same role belongs to the difference between the ambient temperature and the condensing temperature. A kW figure with no condition written against it is like a length with no unit.

What condition the values on this site are at

For evaporators the catalogue capacities are given at the SC2 condition and for R404A; the calculations follow TS EN 328 and the relevant Eurovent standard. For condensers the reference is TS EN 327, and for dry coolers EN 1048. Fan sound pressure levels are calculated to EN 13487 — at 3 m for evaporators and at 10 m for condensers and dry coolers.

These lines stand in the technical blocks of the product pages. They stand there for a reason and not for decoration: an engineer who wants to compare a figure has first to check whether the conditions are the same.

What happens at a different condition

If your project conditions differ from the catalogue condition, the values are recalculated with correction factors. The catalogues give those factors and the tables for how the sound changes with distance; the selection tool runs the same calculation.

Why there is no kW table per model on the site

Because writing a single number leads whoever reads it to think it holds at their own condition. The model lists and the capacity tables are in the catalogues, and the tool that does the calculation is the selection application. Where you are not sure, send us the dimensions — we will run the calculation together and give you the number with its condition.

What does this mean for your own project?

Send us the room volume, the operating temperature and the refrigerant; we will prepare the right unit and circuit layout.

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