LG S24EQ (24,000 BTU, 6.6 kW) - Standard Plus wall-mounted inverter air conditioner with 7.5 kW heating

The S24EQ: top capacity with no network functions

The S24EQ is the most powerful machine of the EQ line: 6.6 kW of cooling, 7.5 kW of heating, 24 000 BTU, up to 70 m², refrigerant R32. Technically it is the S18EQ (item 1810) scaled up for a larger circuit: the same indoor unit of 998 by 345 by 210 mm weighing 12.7 kg, the same Dual Inverter compressor and the same classes A++ in cooling and A+ in heating. The outdoor unit has grown to 950 by 834 by 330 mm and 46 kg, the gas line is 5/8 inch and the maximum run 30 m with 15 m of height difference. Noise is rated 31 dB(A) indoors and 53 dB(A) outside, which is modest for a machine of this capacity. Control is by infrared remote only: no Wi-Fi, no app and no account, which in a public space is more often a plus than a minus.

7.5 kW of heat where the door keeps opening

In a shop, a pharmacy or a branch office the door opens dozens of times an hour, and each opening admits a dose of outside air - this is called infiltration, and it eats a noticeable share of the capacity. That is exactly why the 900 W heating bias over cooling matters more here than in a domestic room: in October the machine fights not only the heat loss of the walls but also the draught from the entrance. The practical conclusion: with an entrance that has no vestibule and no air curtain, the real served area will be 15-20 per cent smaller than the 70 m² on the card. An air curtain over the door, or at least a closer that stops the door standing open, does more good than stepping up the air conditioner's capacity. In cooling the same logic works in reverse: in a heatwave an open door turns the machine into a device that chills the street.

One remote for several machines: the limits of infrared

An infrared remote works in line of sight over 7-8 metres, and in a 70 m² hall that means the machine may not respond from the far corner. In a space with two or three units the remotes get confused: one remote commands every LG machine within line of sight at once, which is convenient for staff but not for setting up separate zones. If a site has more than one machine, it is better to plan wired control from the outset: a PREMTB001 wall controller (item 1897) for each unit, or an AC EZ central controller PQCSZ250S0 (item 1905) for the whole group. A wired controller adds what a public space lacks most - a temperature range limit, so that staff cannot set 16 degrees in January. Controller compatibility with this indoor unit is checked against the manufacturer's documentation before ordering, and we do that before the order is placed.

An outdoor unit of 950 by 834 mm: location and approvals

A unit 834 mm tall and weighing 46 kg can rarely just be hung somewhere: it does not fit a standard recess under a window and it is visible on the facade. In an apartment building, placing such a unit on the facade often requires the agreement of the building manager or the owners' association, and that question is settled before the purchase rather than after the installation. The technical requirements are unchanged: a rigid base, brackets rated for at least 100 kg, through-fixings into load-bearing material, a metre of free space in front of the unit and 50 cm above it. For a ground-floor shop the simplest arrangement is often a frame on the ground raised 30-40 cm with a guard that does not obstruct the airflow. A run of up to 30 metres gives freedom: the unit can be moved to the rear of the building or onto the roof, and that usually removes most of the neighbours' objections.

A 5/8 inch line: installation and later service

The liquid line is 1/4 inch and the gas line 5/8 inch (15.88 mm) - at this capacity the liquid line diameter is worth confirming against the data sheet, since manufacturers often specify 3/8 inch for 6.6 kW. A 5/8 inch tube calls for a bender, a good flaring tool and controlled tightening torque: it is the joints, not the compressor, that are the commonest point of refrigerant leakage. Beyond 7-8 metres of run a top-up at the rate per metre is needed, and vertical sections over 5-6 metres get oil traps in the gas line. If the outdoor unit sits on a roof or high up, think through from the start how it will be reached for seasonal service: without access, cleaning the coil becomes a separate operation with a lift. Service valves fitted on the pipework during installation later save hours on any repair.

Electrics and operating pattern in a commercial space

The machine is single-phase, 220-240 V, 50 Hz; at full cooling it draws roughly 2.1-2.4 kW and in heating up to 2.5 kW, about 10-11 A. The circuit is 4 mm² copper with its own breaker; in a shop with refrigerated display cases the air conditioner's load is counted in the overall service balance, because together they easily exceed a domestic limit. Without Wi-Fi the operating schedule depends on the staff, and in practice that means the machine often runs all night: a mechanical timer in the remote, or a time relay in the board, settles that question more reliably than an instruction to employees. A surge protection relay is mandatory, especially in a space with heavy equipment on the same supply. Classes A++ and A+ mean that in a season of daily duty the machine will use roughly a quarter more than an A+++ equivalent.

Which jobs it fits and where it is out of place

The S24EQ suits a sales floor, a pharmacy, a bank branch, a canteen, a gym or a production space of 50-70 m² where the machine is run from a remote and network functions are either unnecessary or forbidden by the organisation's rules. The heating bias makes it a sensible choice for premises without gas heating that need warming in September-October and March-April. Where the model is out of place: a site managed remotely or on a schedule from a phone - that calls for the PC24SQ (item 1809); a space with partitions that a wall unit cannot serve; bedrooms and quiet studies, because of the 31 dB(A) indoors. Halls with ceilings above 3.5 m are also unsuited to a wall unit: warm air collects overhead while cool air never reaches the people. Year-round cooling of a technical room needs a machine with a low-ambient kit.

How it differs from neighbouring models in this catalogue

The PC24SQ (item 1809) is the same capacity with built-in Wi-Fi and the LG ThinQ app: output, pipework and run length are identical. The S18EQ (item 1810) is the smaller model of the EQ line at 5 kW of cooling and 5.8 kW of heating for spaces up to 50 m², with a 1/2 inch line and a 25 m run. The WZ24AWN (item 1807) is the Inverter Pro at 6.95 kW of both cooling and heating with Wi-Fi: a lighter 11 kg indoor unit, but no heating bias. The H24S1D (item 1803) is the Deluxe rated A+++ at 26 dB(A) indoors: more frugal in daily duty, but its outdoor unit is 60 dB(A). The CT24R (item 1837) is a cassette of the same output with wired control: a dearer installation that needs a suspended ceiling, but four-way air distribution with no cold jet in one direction, which in a room full of people is felt immediately.

Tell us the floor area and the type of entrance - with or without a vestibule - and we will check whether 6.6 kW is enough and select a wired controller if there will be several machines.