LG WZ24AWN (24,000 BTU, 6.95 kW) - Inverter Pro wall-mounted inverter air conditioner with Wi-Fi

The 24 000 BTU Inverter Pro: the top of the basic series

The WZ24AWN closes the Inverter Pro series: 6.95 kW of cooling, 6.95 kW of heating, 24 000 BTU and up to 70 m² on the card. The indoor unit is the same as on the 18 000 BTU model - 998 by 345 mm at a depth of 210 mm, weighing 11 kg - making it the lightest indoor unit of this output in the catalogue. The outdoor module has grown to 950 by 834 by 330 mm and 46 kg, yet its noise rating stays at 54 dB(A), the same as the 9 000 BTU machine of this series. That combination is what makes the model interesting: the capacity of a 24 000 BTU unit with acoustics that are easier to fit into residential surroundings. Classes A++ in cooling and A+ in heating at 7 kW of cooling are a normal level for a machine that works mainly in hot weather.

54 dB from a 46 kg unit - where that settles the matter

The outdoor unit of a 24 000 BTU machine is always the most troublesome part of the installation, and 54 dB(A) against 60 dB(A) in the Deluxe series is the main practical argument here. For a shop on the ground floor of a residential building, or a cafe in a courtyard, those six decibels often decide whether the unit will be accepted by the residents. Physically 6 dB means roughly half the sound power rather than six per cent of difference, so the effect is clearly audible. The unit still goes on vibration mounts, with a flexible section in the pipework and a frame with stiffness to spare: at 46 kg and with a large fan, structure-borne noise through the wall is more of a nuisance than airborne sound. A canopy against snow from the roof is positioned so as not to obstruct the discharge, and space is left beneath the unit for defrost water to drain.

6.95 kW of cooling and the same of heating

The card gives identical cooling and heating capacities of 6.95 kW, which points straight at the purpose of the machine: it is built to cool a large volume, with heating as a supplementary function. For a 60-70 m² space in a heatwave that is a serious margin: the unit removes heat from a shop window, people, lighting and equipment at the same time. In the shoulder season 6.95 kW of heat is theoretically enough for the same volume, but this series lacks the heating bias that Deluxe and ARTCOOL have, so for a cool November a second heat source is better. The operating envelope of LG residential R32 splits runs roughly from -10 to +48 °C in cooling and down to about -10 °C in heating; exact figures are checked against the data sheet of the specific variant. For winter heating of a space this size the catalogue offers Therma V heat pumps such as the HU161MA.U33RU (item 1884).

31 dB indoors: why, and when it is acceptable

31 dB(A) is the rated indoor noise at the lowest fan speed, and it is the highest figure among residential wall units in this catalogue. The reason is physical: removing 7 kW of heat means pushing a large volume of air through the coil, and that means a faster fan. In a sales floor, a cafe, a workshop or an open-plan office, 31 dB(A) disappears entirely into the background noise of the space. In a bedroom or a quiet study the machine will be heard, and that is not a flaw of the model but a consequence of its capacity: quiet rooms get smaller machines or cassettes, whose fan is spread across the ceiling. If quiet is critical and the area is large, the right answer is two 3.5 kW units rather than one of 7 kW.

Runs up to 30 metres and a 5/8 inch line

The card lists a 1/4 inch liquid line and a 5/8 inch (15.88 mm) gas line with runs up to 30 m and 15 m of height difference; for a 7 kW machine the liquid line diameter is worth confirming against the data sheet when ordering, because manufacturers often specify 3/8 inch at this capacity. A 5/8 inch tube is serious pipework: it is bent only with tools, and flares are formed with a good flaring tool and controlled tightening torque. A 30 metre run allows the unit to sit in the far corner of a yard or on a roof, but it requires a refrigerant top-up at the rate per metre and oil traps on vertical sections longer than 5-6 metres. Evacuating a system of this volume takes longer, and that stage cannot be cut short: residual moisture in a large circuit leads to acid formation and compressor wear sooner. Insulation goes on each pipe separately and is protected from ultraviolet along the whole outdoor section.

Electrics: 7 kW of cooling from a single phase

The machine is single-phase, 220-240 V, 50 Hz; at full cooling it draws roughly 2.1-2.4 kW, about 10-11 A. A 2.5 mm² circuit is no longer adequate for that load: the correct approach is 4 mm² copper with a breaker to the design, especially where the board is more than 20 metres from the unit. In a house or shop with a single-phase service of 5-8 kW this machine is planned together with the rest of the load: it occupies a third of the whole service. An inverter start removes the surge problem, but it does not raise the permitted average service capacity. A surge protection relay is mandatory: in a commercial space full of equipment, sags and spikes happen more often than in a flat.

Which jobs it fits and where it is out of place

The WZ24AWN makes sense in a sales floor, a cafe, a workshop, a small gym or dance studio, an open-plan office of 50-70 m², wherever capacity and a relatively quiet outdoor unit both matter. It is also an option for a large attic or extension that needs cooling in a heatwave when there is no way to run ductwork. Where the model is out of place: spaces with partitions, corridors and separate offices; halls with ceilings above 3.5 m; bedrooms and other quiet rooms, because 31 dB(A) is audible there. Spaces that must be cooled all year round need a machine with a low-ambient kit. And if the unit will run from morning to night throughout the season, it is worth comparing with class A+++ in the Deluxe series, where the higher purchase price is offset by lower consumption.

How it differs from neighbouring models in this catalogue

The WZ18AWN (item 1806) is the 18 000 BTU machine of this series at 5.05 kW for 50 m²: a lighter 38 kg outdoor unit, a 1/2 inch line, a 25 m run and 29 dB(A) instead of 31. The H24S1D (item 1803) is the Deluxe machine of this capacity rated A+++ at 26 dB(A): more frugal and quieter indoors, but its outdoor unit is rated 60 dB(A). The PC24SQ (item 1809) is the Standard Plus 6.6 kW machine with Wi-Fi: a different line with almost the same output. The S24EQ (item 1811) is the same model in the Eco version without Wi-Fi, controlled only by remote, which is sometimes more convenient in a public space. The CT24R (item 1837) is a cassette of the same output: a dearer installation, but with even air distribution and no cold jet in one direction, which in a 70 m² room is usually more comfortable.

Describe the space and show us where a 46 kg unit could stand, and we will check whether one 24 000 BTU machine will cope - and offer a cassette option for comparison.