GMCC KSG240V1VMP Rotary Compressor: 23.8 cm3, Three 240 Builds, and the Letter That Sets the Efficiency Class

By the Qishanr technical desk. Reviewed 2 November 2026.

The KSG240V1VMP is a printed row in the GMCC rotary compressor product manual: 23.8 cm3/rev displacement, 7450 W of cooling capacity, which is 25419 Btu/h, for 1695 W of input, a coefficient of performance of 4.40, on R32 at single-phase 50 Hz 220/240 V. The row is easy to find. What is not easy is knowing which of three rows that all carry the digits 240 you are actually ordering, because the catalogue prints them with capacities of 7450 W, 7200 W and 6190 W, and the coefficient of performance runs from 4.40 down to 2.96. The three differ in the supply band, in the test condition printed above the table, and in one letter of the model string that the manual's own legend assigns to the motor class. That letter moves efficiency further than any change of displacement inside the family.

Key facts at a glance

Two arithmetic checks hold on this row, and they are worth doing because not every row in the family passes them. The imperial column returns exactly the metric column at 3.412 Btu per watt-hour: 7450 x 3.412 is 25419. The coefficient of performance returns exactly the printed 4.40 from capacity divided by input: 7450 / 1695 is 4.395, printed to two places. A third check, displacement against capacity, does not belong on a single row at all, and that is the subject of the rest of this page.

What does the model string fix, and what does it leave open?

Reading the string against the manual's legend:

- K is the refrigerant letter, which the legend maps to R32 and R410A.

- S is the cylinder arrangement, single cylinder in the legend's structure list. The family in the same block also carries Q for single-cylinder vapour injection and T for twin cylinder, so S is a structural statement rather than a size statement.

- G is a series name. The legend labels that position series, and it does not expand the letter into a mechanism, a platform or a generation. Anything beyond series label is an assumption.

- 240 is the displacement code, printed in the legend as displacement in cm3/rev multiplied by 10. The code reads 24.0. The row prints 23.8. The code sits 0.2 cm3 above the printed displacement, which is 0.8 per cent, and the direction of that rounding is not constant across the family: the 195 row prints 19.6, above its code, while the 200 row prints 20.2. The code is a nominal size class, not a measurement.

- V1 is the supply, and here the rows police themselves. Across the twenty KSG rows this manual prints, every row under a 220/240 V heading carries V1, every row under the 230 V heading carries S1, and both rows under the 60 Hz 208~230 V heading carry N1. That is eight, ten and two rows with no exception, which is stronger evidence than a legend entry.

- The letter after V1 is the motor class. The legend lists U as standard, V as low load and high efficiency, C as low load for dehumidifiers, and S, T, W and E as four grades of high load. This is the position that decides efficiency, as the next section shows.

- The last two characters are not covered by any list in this catalogue. They are printed, they are stable per row, and this page does not decode them. Treat them as part of the order string, not as a specification.

The practical reading is that the string fixes refrigerant, structure, series, nominal size, supply band and motor class, and leaves open every quantity that a buyer usually wants first: capacity, input, efficiency, connection sizes and mass all live in the row and in the block beside it, not in the string.

Why do three rows carry the 240 code and print 7450, 7200 and 6190 W?

Three rows, one code, three capacities. Each difference has a named cause and none of them is displacement.

The first pair isolates the supply band. KSG240V1VMP and KSG240S1VKT print the same 23.8 cm3/rev, sit under the same 50 Hz frequency and the same GX test condition, and carry the same motor-class letter. The only difference in the heading is the declared supply, 220/240 V against 230 V. The 220/240 V row prints 250 W more capacity, which is 3.5 per cent, for 30 W more input, which is 1.8 per cent, and its coefficient of performance is 4.40 against 4.32. A buyer who orders by displacement and frequency alone will consider these two rows interchangeable. The catalogue does not.

The third row isolates the test condition and the motor class at once. KSG240V1SMV sits under a heading that reads R32 T3 with an ASH test condition, prints 24.0 cm3/rev rather than 23.8, and carries S where the other two carry V. It makes 6190 W, which is 16.9 per cent below the 220/240 V GX row, and it draws 2090 W, which is 23.3 per cent above it. The coefficient of performance falls from 4.40 to 2.96, a drop of 32.7 per cent. Two of those three changes are visible in the string and one is visible only in the heading, so the row cannot be read without the heading.

The lesson is not that one row is better. It is that the digits 240 describe a nominal size class that the catalogue populates with at least three different builds, and the differences between them are larger than the difference between the 240 and 250 codes.

What does swept volume per second explain, and what does it not?

Displacement is a volume per revolution, so capacity per unit of swept volume per second separates a build difference from a speed difference:

This table rules out the easiest explanation. The ASH row sweeps the largest volume of the three, 1200 against 1190, and still produces the least cooling per swept cubic centimetre, 5.16 against 6.26. Running slower is not the reason it is the weakest of the three. The reason sits in the heading and in the motor-class letter, and the metric makes that unavoidable.

The same metric is remarkably stable inside the high-efficiency set. Across the thirteen V-class rows in the two 50 Hz headings, capacity per swept cubic centimetre runs from 6.05 to 6.29, a spread of about four per cent over displacements from 16.5 to 28.9 cm3/rev. That is what a common design looks like when it is scaled: the geometry changes, the output per swept volume does not.

Which letter decides efficiency?

The motor-class letter is the largest single lever in this family, and it can be shown without leaving one heading. All six rows below sit under R32 at 1-phase 50 Hz 220/240 V with the GX test condition:

The two sets do not overlap on any of the three efficiency metrics. The U rows run 2.98 to 3.00 on coefficient of performance; the V rows run 4.18 to 4.40. The U rows produce 5.13 to 5.19 W per swept cubic centimetre; the V rows produce 6.16 to 6.27. The U rows sit at 256.6 to 259.6 W per cm3 of displacement; the V rows at 307.9 to 313.3. A gap that clean across three different normalisations is a design statement, not measurement noise.

Put two rows side by side to see what it costs. KSG230V1UKU at 22.9 cm3/rev and KSG240V1VMP at 23.8 cm3/rev are 3.9 per cent apart on displacement. The U build makes 5945 W at a coefficient of performance of 3.00. The V build makes 7450 W at 4.40, which is 25.3 per cent more capacity on 14.4 per cent less input. The displacement is nearly the same; the product is not.

One further check ties the letter to the heading rather than to chance. The ASH row, KSG240V1SMV, carries S, which the legend places with the high-load grades rather than with the low-load high-efficiency grade. Its efficiency metrics land inside the U set, not the V set: 5.16 W per swept cubic centimetre and 257.9 W per cm3, against the U range of 5.13 to 5.19 and 256.6 to 259.6. The efficiency letter behaves the same way in a completely different heading, which is the kind of consistency that makes a naming rule usable.

Two KSG builds the supplier currently lists carry the U letter and sit at the bottom of the efficiency range where the manual's U rows sit, not in the 4.18 to 4.40 band of the V rows, which is a check from a second document rather than a restatement of the first:

Those are the listing values, which are the supplier's own statement about stock rather than a manufacturer row. They still matter, because the catalogue prints 4.35 for a 19.6 cm3/rev build, KSG195S1VKU, whose V letter is the high-efficiency grade, so the same displacement appears with 2.90 on one route and with 4.35 on the other. Those two rows also differ in supply band, so the gap cannot be attributed to the letter alone. One of the two listings, KSG186V1VKU at 18.6 cm3/rev, has no row in the 2024 manual at all; the nearest printed build is 18.5 cm3/rev. Where the two documents overlap, the catalogue is the reference for this page; where they differ, the difference is logged rather than averaged.

What does the row print, and what does it not?

The manual states its own limit in its front matter: the data of this catalog is for reference only, and the actual data is subject to the latest specification document. That sentence is the correct frame for everything above. The row is a design statement, not a contract, and eight of the fields a system designer needs are simply absent from it.

There is also one arithmetic defect to know about, because it tells you how much weight the table can carry. In the same block, KSG290V1VMU prints 9055 W at 2050 W with a coefficient of performance of 4.34. Capacity divided by input is 4.417, and the imperial column closes on 30896 Btu/h at 3.412, so the capacity figure itself is internally consistent. The mismatch is between the input and the coefficient of performance, and it is the only such mismatch among the nineteen KSG rows this page uses. Whether the input or the coefficient is misprinted cannot be decided from the catalogue. One row that does not close is enough to justify checking the specification document before any order, and it is also why this page recomputes every coefficient rather than copying it.

Where does it sit in the KSG ladder?

Inside the 230 V heading the family runs ten rows from 16.5 to 25.0 cm3/rev:

Capacity per cm3 stays between 302.5 and 314.2 across a 51.5 per cent spread in displacement, which confirms the family is one design scaled. The interesting cell is the 240 row: at 302.5 W per cm3 it is the lowest in the ladder, and it carries a 55/400 capacitor where the rest of the ten print 40/400 or 60/400. Displacement alone would not have predicted that; the row does.

The 60 Hz heading gives the frequency check. KSG230N1VMT prints 22.9 cm3/rev and 8525 W against the 230 V 50 Hz row's 7110 W at the same displacement. The swept volumes are 22.9 x 60 = 1374 and 22.9 x 50 = 1145 cm3 per second, and the capacity per swept cubic centimetre is 6.20 against 6.21. The extra 1415 W is the extra 20 per cent of swept volume, not a stronger build, which is exactly what the metric is for.

The catalogue marks rows it still has under development with a triangle and explains the mark in its own footnote. Neither 240 V row carries it, and neither does the 230 V 240 row, so all three are presented as current products rather than previews.

What duty does this row belong to?

The string carries no leading duty letter, and the legend reserves that position for heat pump, freezing, heating and cabinet duty, with the undivided case meaning compressors for air conditioning. The only application statement this row makes is therefore air conditioning on R32 at 220/240 V, 50 Hz.

Capacity of 7450 W is 25419 Btu/h, which is about 2.12 refrigeration tons at 12,000 Btu/h per ton. That is a conversion, not a rating, and it places the row in the size class of a large residential split or a small packaged system. It says nothing about which equipment the model is approved in, because the catalogue prints no approved-equipment list for any row. Anything more specific has to come from the equipment maker, and the safe way to write a requirement is to quote the row plus its heading rather than a tonnage.

The high-ambient variant is the row to look at when ambient is the binding constraint rather than capacity. KSG240V1SMV sits under a heading that prints T3 alongside R32 and an ASH test condition, and it is the only 240 build with a high-load motor letter. The trade is explicit in the table: 6190 W at a coefficient of performance of 2.96 instead of 7450 W at 4.40. A buyer who needs the high-ambient build should expect to pay that difference in efficiency, and a buyer who does not need it should not accept it.

How should a buyer specify this model?

The order of those steps matters. Buyers usually start at capacity and work backwards, which is the one order that cannot work here, because the capacity is the output of the other five choices rather than an input to them. Start with the string and the heading, and the capacity follows.

Where can this row be checked?

Four documents and four pages cover this article, and they do different jobs.

The primary document is the 2024 edition of the manufacturer's rotary compressor manual, which is where the row, the heading, the legend and every figure above come from. The official entry point for the current edition is the downloads page on the manufacturer site, and a distributor-hosted copy of the 2024 manual is the file this page was read from, byte for byte identical at 2,990,900 bytes. The manufacturer's product centre gives the family positioning for the KSG series without repeating the row data.

On the supplier side, the GMCC rotary compressor range page is the category entry for this family, the wider rotary compressor category page covers the platform it belongs to, and the GMCC scroll line is the adjacent technology a buyer usually compares against when the capacity requirement grows. The R410A example on the blog side shows how the same catalogue reads when the refrigerant letter is not K, which is a useful contrast for anyone ordering across platforms.

The two administrative pages are the ones that age fastest. The news index carries edition changes to the manual, and any capacity figure quoted here should be re-read there before it is written into a purchase order.

Which standards and approvals frame the purchase?

Three documents sit outside the catalogue and shape a purchase of this row.

The safety side of a motor-compressor is governed by the IEC 60335 household appliance safety series, of which IEC 60335-2-34 is the part written for motor-compressors. That is the standard a test house will cite when it certifies the component, and it is the reason approval marks matter even though this catalogue prints none.

The refrigerant side is a commercial constraint before it is an engineering one. R32 is a single-component refrigerant rather than a blend, so it does not fractionate and does not need the top-up rules that apply to blends, which is one reason it holds its place in residential air conditioning. Refrigerant supply and handling in the European market are governed by Regulation (EU) 2024/573, which is where a buyer confirms obligations rather than in a compressor catalogue. The designation and safety classification of the refrigerant itself belong to the designation standard, not to this table.

The demand side is worth a sentence because it explains why a family like this keeps ten rows within one design. The IEA's The Future of Cooling sets out how much of the growth in electricity use comes from air conditioning in warm markets, and every efficiency point in a row like this one is multiplied by that volume.

Against all three, the catalogue's own sentence still governs the numbers: reference only, subject to the latest specification document.

Frequently asked questions

What is the cooling capacity of the KSG240V1VMP?

7450 W, printed as 25419 Btu/h, at the GX test condition on single-phase 50 Hz 220/240 V with R32. The capacity belongs to that heading and is not transferable to another band.

Is 240 the displacement?

No. The legend prints the displacement field as cm3/rev multiplied by 10, so 240 reads as a 24.0 nominal class. The row prints 23.8 cm3/rev, which is 0.8 per cent below the code, and the sibling ASH row prints 24.0 for the same code.

Is it a 50 Hz or a 60 Hz compressor?

50 Hz, single phase, in the 220/240 V band. The 60 Hz family is a separate set of rows with N1 in the supply position, and those rows print different capacities for the same displacement.

What refrigerant does it use?

R32, from the K in the first position of the string and confirmed by the band heading above the table. The same letter position covers R32 and R410A across the catalogue, so the letter identifies the refrigerant family without distinguishing the two on its own.

Can I substitute KSG240S1VKT for this model?

Not on capacity grounds. It prints the same 23.8 cm3/rev but sits in the 230 V band and prints 7200 W at a coefficient of performance of 4.32, against 7450 W and 4.40 here. The two are 3.5 per cent apart on capacity and differ in declared supply, so the substitution is an electrical decision as much as a thermal one.

What is the difference between KSG240V1VMP and KSG240V1SMV?

Three things at once: a high-load motor letter instead of the high-efficiency letter, an ASH test condition under a heading that prints T3, and a printed displacement of 24.0 instead of 23.8. The result is 6190 W at 2.96 rather than 7450 W at 4.40.

What capacitor does it need?

The row prints 45/400. Its 230 V sibling prints 55/400 and the ASH row prints 55/400, so the capacitor is one more field that must be read from the row rather than carried across the family.

Does this row get revised?

The catalogue prints its own revision rule in the front matter: the data is for reference only and the actual data is subject to the latest specification document. Rows do change between editions, and the news index is where the supplier records a new edition. Any figure from this page should be checked against the current document before it enters a purchase order.

What horsepower or tonnage is it?

The catalogue prints no horsepower field for any KSG row, so any horsepower figure is a trade label rather than a manufacturer rating. The tonnage conversion is about 2.12 refrigeration tons at 25419 Btu/h, which is useful for sizing conversations and should not be written into a purchase specification.

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