GMCC Air Conditioner Compressor KSM120V2UFT: R32 Rotary Technical Data, Performance, Applications and Selection Guide

The GMCC KSM120V2UFT is a hermetic single rotary compressor for R32 air conditioning, in the 12.0 cm3/rev displacement class, published by the manufacturer on single phase 220-240 V 50 Hz. This guide sets out every published figure for the KSM120 class and for the V2 generation it belongs to, states plainly which figures the manufacturer does not print for this exact suffix, and gives a selection sequence a buyer can work through without guessing.

What Is the GMCC KSM120V2UFT?

The KSM120V2UFT is a fixed-speed hermetic rotary compressor in GMCC's SM series, the R32 branch of the company's rotary range. GMCC and Welling is the manufacturer whose documents this guide is based on. The model number carries four fields: a series field, a displacement field, a generation field and a build field. The displacement field reads 12.0 cm3/rev, which three separate manufacturer rows confirm, and the generation field is the second generation of the KSM design.

Rotary compressors of this class are the standard machine for residential split air conditioners and small commercial cooling equipment, where a rolling piston and a single vane give a compact, low-component-count compressor. R32 is a single-component refrigerant, which is why the SM series exists as a separate branch from the R410A siblings in the same manual. The seller stocks the series under its GMCC rotary compressor range.

Key facts at a glance

How the KSM120V2UFT model number decodes

The digits in the displacement field are not always exact. In the documented KSM family the field matches the printed displacement for most members, 99 giving 9.9, 103 giving 10.3, 106 giving 10.6, 113 giving 11.3 and 125 giving 12.5, but the model numbered 135 is printed at 13.3 cm3 rather than 13.5, and the model numbered 133 is also printed at 13.3 cm3. A buyer should read the displacement column rather than dividing the model digits by ten, and should never derive a capacity from the model number.

What the manufacturer publishes for this model number, and what it does not

This is the most important paragraph on the page, and it is stated before any figure rather than after.

The manufacturer's product selection manual prints a KSM displacement class of 12.0 cm3/rev under three different suffixes, and prints a V2 generation of the KSM design under one suffix. It does not print the combination. Across the three manufacturer manuals read for this guide, which together list more than one hundred KSM rows, these are the relevant strings:

• KSM120V1UFE, at 12.0 cm3/rev
• KSM120V1VFE, at 12.0 cm3/rev
• KSM120E1VET, at 12.0 cm3/rev
• KSM113V2VFTL, KSM125V2VFTL and KSM133V2VFTL, the V2 generation at 11.3, 12.5 and 13.3 cm3/rev

The exact string KSM120V2UFT does not appear in any of them. It also does not appear in the seller's product pages on the target site, and it does not appear in the seller's store index.

The honest reading is a two-part statement. The model number itself is consistent with the manufacturer's naming system, because the 12.0 cm3 class, the V2 generation and the UFT build suffix are each separately documented, so the designation is credible. But the manufacturer's published performance row for this exact suffix has not been located, so no capacity, input power or efficiency figure is quoted for KSM120V2UFT anywhere in this guide. The figures below are labelled with the exact model they belong to, and a buyer needing this variant's own rating must request the model-specific sheet from the supplier.

What Are the Technical Specifications of the GMCC KSM120V2UFT?

The published 12.0 cm3 KSM class

Three manufacturer rows print a 12.0 cm3/rev KSM compressor. They are reproduced verbatim from the manual tables and they are not interchangeable.

The same 12.0 cm3 displacement produces capacities that differ by about 47 percent between the lowest row and the highest, so displacement alone does not determine capacity. The highest-capacity row, KSM120E1VET, also prints the lowest input of the three while producing the highest output, which is what a higher-efficiency build looks like and is why the suffix matters more than the displacement in this class. The family also brackets this class on both sides, from the KSM89V1VDZ listing at 8.9 cm3/rev upward.

The V2 generation rows in the same series

The manufacturer prints a V2 generation of the KSM design at three displacements. These are the closest documented relatives of the requested model.

The efficiency is flat: all three rows sit between 4.22 and 4.24 W/W while capacity rises from 3440 W to 4090 W. The V2 generation scales capacity by displacement without a measurable efficiency penalty across the range printed.

Reading across the two tables gives the buyer a useful boundary. Between the published V2 KSM113 at 11.3 cm3 and the published V2 KSM125 at 12.5 cm3 there is a gap that a 12.0 cm3 V2 model would fill, and the requested KSM120V2UFT falls inside that gap. The KSM125V1VFT product page is the nearest documented machine above it. That is an observation about the shape of the manufacturer's line-up and not a capacity figure, and it is offered as such.

What the tables do and do not carry

Each KSM row in the manual prints six fields whose meaning can be established from the table itself: the model string, the displacement in cm3/rev, the cooling capacity in watts, the cooling capacity in Btu/h, the input power in watts, and the coefficient of performance in W/W. The relationships between them can be checked, and they hold: capacity in watts times 3.412 reproduces the Btu/h figure, and capacity in watts divided by input power reproduces the printed efficiency.

Each row also prints four further numeric fields to the right of the efficiency column. The manual's text layer does not carry the headings for those four columns, so this guide does not name them. For completeness they are quoted verbatim for the V2 rows: 35/370, 290, 8.1 and 12.9 for KSM113V2VFTL and KSM125V2VFTL, and 40/370, 290, 8.1 and 12.9 for KSM133V2VFTL. The pair of numbers separated by a slash varies between rows in the family, from 25/370 to 40/400 to 70/250, and is the field most likely to constrain an application; a buyer should obtain its definition from the supplier rather than assume it.

How Does the GMCC KSM120V2UFT Perform?

Efficiency in the KSM120 class

The published efficiencies in the 12.0 cm3 class span 2.88 to 4.28 W/W. The E1VET build reaches 4.28 W/W at a 4450 W output and the V1VFE build reaches 3.00 W/W at a 3094 W output, both figures the manufacturer's own printed values for those exact suffixes.

The arithmetic in every row is internally consistent. Dividing the printed capacity by the printed input reproduces the printed efficiency: 3025 divided by 1050 gives 2.881 against a printed 2.88, 3094 divided by 1030 gives 3.004 against a printed 3.00, and 4450 divided by 1040 gives 4.279 against a printed 4.28. The capacity printed in watts also converts to the capacity printed in Btu/h at the standard factor, 3025 times 3.412 giving 10321, 3094 times 3.412 giving 10557, and 4450 times 3.412 giving 15183. Every row is arithmetically sound on its own terms.

A disagreement between editions of the manufacturer's own manual

One row of the 12.0 cm3 class is printed differently in two editions of the manufacturer's manual, and the arithmetic settles which reading is internally consistent.

The two candidate capacity figures are 2729 W and 3094 W, and every other field in the row is identical between the editions. The printed Btu/h figure of 10557 divides by 3.412 to give 3094 W, and the printed efficiency of 3.00 is exactly 3094 divided by 1030. Two of the three numeric fields therefore agree on 3094 W, and only the watt field in the Famco edition disagrees. That is a strong indication that 2729 is the defective figure, but this guide reports the disagreement rather than silently correcting the manufacturer's document.

A second disagreement, between generations of the model name

A whole row of figures is printed against two different model names in different editions.

Every numeric field is identical and only the model name and the displacement change. There are two possible readings: the same physical build was sold under two designations in different editions, or one edition mislabelled the row. The 2024 edition also prints a separate KSM135V1VFT row at 13.3 cm3 with 4085 W, 13938 Btu/h, 962 W and 4.25 W/W, so the 13.3 cm3 displacement is represented twice in that edition with different performance. This guide reports both readings and does not choose between them. A buyer specifying a 13.3 cm3 machine should ask which row applies.

What the manufacturer does not publish for this class

No pressure, no sound power level, no vibration limit, no starting current and no running current is printed for the KSM120 class in the tables read here. No bore, stroke or shell dimension is printed either. A supplier asserting any of those values for this model should be asked for the model-specific sheet that carries it.

What Applications Suit the GMCC KSM120V2UFT?

What the published fields support

The SM block sits under the manufacturer's green refrigerant heading and is printed on R32. The series is presented as an air conditioning branch of the rotary range, and the 12.0 cm3 class in it is a mid-size single rotary machine with a published mass of 12.9 kg in the larger bracket and a printed field pair in the 35 to 370 band for most members.

The displacement together with the published mass and the printed band place this class in the small and medium unitary air conditioning bracket rather than in commercial refrigeration. The seller's full rotary range shows which of these brackets it currently stocks. That is a statement about the class, drawn from the printed fields, and not a claim about an unpublished duty limit for this exact suffix.

Equipment classes the published fields support

Where the class is not the right choice

• Where a three phase supply is mandatory. Every KSM120 row read here is printed in a single phase 220-240 V 50 Hz column group. No three phase KSM120 row was found.
• Where a 60 Hz supply is mandatory. Every KSM120 row read here is printed on 50 Hz. No 60 Hz KSM120 row was found.
• Where deep evaporating temperatures are needed. The band pairs printed across this family run from 25/370 to 40/400 to 70/250, which are comfort and process cooling bands. A machine working well below them is a different family.
• Where the charge is capped by a flammable refrigerant limit. R32 is classed as a flammable refrigerant and the charge a system may hold is limited by the standard the appliance is assessed under. That is a system design limit, not a compressor limit, and it must be resolved before the compressor is chosen.
• Where a documented rating for this exact suffix is required before award. The manufacturer's published row for KSM120V2UFT has not been located, so the model-specific sheet has to be obtained first.

How to match the machine to a duty

1. Fix the refrigerant as R32. The SM block is an R32 branch, and the sibling R410A branches of the same manual are different machines with different published figures.
2. Fix the supply. Confirm 220-240 V, 50 Hz, single phase. If the site is three phase or 60 Hz, this class does not cover it.
3. Fix the required evaporating temperature and check it against the band pair printed for the specific suffix, because the family prints several different pairs.
4. Choose between the documented suffixes of the class for capacity, using the table above, because the class spans 3025 W to 4450 W at one displacement.
5. Ask which edition of the manual the quotation follows, because one row of this class is printed differently in the 2024 edition and the earlier editions.
6. Request the model-specific sheet for the exact suffix on the quotation, since the manufacturer's published row for KSM120V2UFT was not located.
7. Confirm the oil charge and the oil type against the model-specific sheet rather than the family table.
8. Confirm the refrigerant charge limit for R32 on the finished appliance against the standard the appliance is assessed under.

How Does the KSM120V2UFT Compare With Sibling GMCC Rotary Compressors?

The manufacturer's 2024 edition prints a full SM block on R32 at single phase 220-240 V 50 Hz. The rows bracketing the 12.0 cm3 class are reproduced below, so a buyer can see where the class sits rather than only where the model sits.

Three observations follow from the table as printed.

Capacity is not a function of displacement alone. The 9.7 cm3 row delivers 2905 W while the 9.5 cm3 row delivers 2365 W, an 18 percent difference across a 0.2 cm3 step. The build suffix, not the displacement field, is what separates a high-efficiency machine from a higher-input one in this family.

The 12.0 cm3 rows are the lowest-efficiency rows in the mid bracket. Both of them sit below 3100 W with efficiencies of 2.88 and 3.00, while the rows immediately below them at 10.3 and 10.6 cm3 reach 4.22. A buyer who assumes the mid bracket is more efficient than the small bracket will be wrong on this table.

The efficiency clusters split by generation. The V11 and V1VFT rows sit at 4.18 to 4.25 W/W and the V2 rows sit at 4.22 to 4.24. The V2 generation did not raise efficiency across the family; it extended the capacity band at the same efficiency.

How Do You Select the GMCC KSM120V2UFT for a System?

1. Confirm the model string with the supplier in writing. The manufacturer's published tables list the 12.0 cm3 class and the V2 generation as separate groups, so the exact combination should be confirmed before a quotation is built on it.
2. Confirm the refrigerant is R32. The SM block is an R32 branch. A system built for R410A is a different compressor from the same manual, not a variant of this one.
3. Confirm the supply is single phase 220-240 V 50 Hz. No three phase and no 60 Hz KSM120 row was found in the manuals read.
4. Obtain the model-specific performance sheet for the exact suffix. This is not optional for this model. The class spans 3025 W to 4450 W at one displacement, so a figure quoted without a suffix attached cannot be checked.
5. Read capacity off the model-specific grid, never off the model number. The digits in the displacement field are also inexact in this family, as the 135 and 133 rows show.
6. Ask which test condition the quoted figure is on. The manual prints more than one condition and states the condition in the column group heading. Two correct quotations on different conditions will not match.
7. Ask for the definition of the four unnamed right-hand fields. The band pair in particular differs across the family and is the field most likely to rule an application in or out.
8. Confirm the oil charge and the oil family from the model-specific sheet. The family table prints them but their headings are not recoverable.
9. Confirm the starting arrangement. The manual does not print a starting current for this class, so the electrical protection has to come from the model-specific sheet.
10. Confirm the R32 charge limit for the finished appliance. This is a system-level limit set by the appliance standard, and it is independent of the compressor selection.

Which Standards and Approvals Apply to the GMCC KSM120V2UFT?

Two points deserve to be stated rather than left to the reader. The figures in this guide are not EN 12900 figures. They are the manufacturer's own table figures, printed with the test condition stated in the column group heading, and a quotation expressed on EN 12900 conditions will not reproduce them. And R32 is classified as a flammable refrigerant, so the charge a system may hold of it is limited by the appliance standard the finished equipment is assessed under, not by anything in the compressor data. No global warming potential figure is quoted for R32 in this guide, because the documents read for it do not print one. For the wider demand and efficiency context around this class of machine, the IEA Future of Cooling report is the standard industry reference.

Frequently Asked Questions

What displacement is the GMCC KSM120V2UFT?

The 120 field puts it in the 12.0 cm3/rev class, and three separate manufacturer rows carrying the 120 field all print 12.0 in the displacement column. The manufacturer's published row for the KSM120V2UFT suffix itself was not located.

What refrigerant does the KSM120V2UFT use?

R32. The KSM models are printed under the R32 heading of the manufacturer's SM block, and the same manual carries R410A branches as separate machines. The seller lists both branches side by side in its GMCC rotary range.

What capacity does the KSM120V2UFT produce?

No capacity is quoted for this exact suffix, because the manufacturer's published row for it was not located in any of the manuals read. The documented 12.0 cm3 KSM rows print 3025 W, 3094 W and 4450 W, each against its own suffix.

Why is there no capacity figure for this model?

Because the manufacturer's tables list the 12.0 cm3 displacement class and the V2 generation as separate groups and do not print their intersection. The model number is consistent with the manufacturer's naming system, but a figure that cannot be traced to a printed row is not published here.

Is the KSM120V2UFT a fixed speed or an inverter compressor?

Fixed speed. The KSM models appear in the manufacturer's fixed frequency section, and the inverter machines in the same manual carry different series prefixes. The KSK75D43UEZA page is an inverter machine from the same maker, shown for contrast.

What voltage does it run on?

220-240 V, 50 Hz, single phase, from the column group heading the KSM rows are printed under. No three phase and no 60 Hz KSM120 row was found.

What is the difference between the V1 and V2 generations of the KSM?

The V2 generation is printed at 11.3, 12.5 and 13.3 cm3 with efficiency between 4.22 and 4.24 W/W. It extended the capacity band at the same efficiency rather than raising it. The nearest documented V1 machine in the bracket is the KSM125V1VFT listing.

What does the UFT suffix mean?

The same three-letter suffix is printed on other GMCC models at 13.3, 13.9 and 21.5 cm3 in the manufacturer's own tables, so it is a build designator rather than something specific to this displacement. The manuals read here do not print a field-by-field legend for it, so this guide does not assign a meaning to each letter.

Why do two rows of this family have the same figures under different model numbers?

One row, quoted as KSM120V1UFE in the 2024 edition and as KSM135V1UFT in the earlier editions, prints identical capacity, input and efficiency figures under both names with different displacements. That is reported here as an unresolved disagreement rather than resolved by preference.

Which oil does it use?

The family table prints an oil-charge field, but its column heading is not recoverable from the manual's text layer, so no oil figure or oil type is asserted for this model. The model-specific sheet is the place to obtain it.

Can it be used in a heat pump?

R32 rotary machines of this class are used in reversible equipment, but the band pair printed for the family differs between builds. The band for the specific suffix has to be confirmed before a heat pump duty is specified. The DSG320S1UFT guide covers a larger rotary machine from the same maker.

Does it come in a three phase version?

No three phase KSM120 row was found in any of the manuals read. If a three phase supply is mandatory, a different family in the same manual is the place to look.

Sources

1. GMCC rotary compressor product catalogue, 2024 edition, manufacturer manual, SM block R32 rows and the V2 generation rows
2. GMCC rotary compressor catalogue, Famco edition, manufacturer manual, earlier edition KSM rows
3. GMCC rotary compressor catalogue, Totaline edition, manufacturer manual, earliest edition KSM rows
4. GMCC rotary compressor catalogue, distributor mirror, manufacturer catalogue hosted by a distributor
5. GMCC rotary compressor range on the target site, the R32 and R410A rotary group
6. GMCC rotary compressor KSM125V1VFT, sibling product page in the same displacement bracket
7. GMCC rotary compressor KSM89V1VDZ, smaller sibling product page
8. GMCC rotary compressor KSM135V1VFT, larger sibling product page
9. GMCC rotary compressor KSK75D43UEZA, DC inverter sibling for contrast
10. GMCC rotary compressor KSG250V1VMT, large displacement sibling
11. GMCC rotary compressor KSN108D22UFZ, SN series sibling
12. GMCC rotary compressor HSM185V1UFT, another model carrying the same build suffix
13. GMCC rotary compressor DSF340V1UFT, inverter model carrying the same build suffix
14. GMCC rotary compressor EKPM310D85UMTR guide, target site article on a larger inverter rotary
15. GMCC rotary compressor EAPN150D33UFZ3 guide, target site article on a twin cylinder rotary
16. GMCC rotary compressor DSG320S1UFT guide, target site article carrying the same build suffix
17. GMCC HSM165V03UDZA air conditioning rotary guide, target site article on an air conditioning rotary
18. GMCC rotary compressor range index, the full rotary category on the target site
19. IECEE standard page for IEC 60335-2-40:2022, appliance standard for heat pumps and air conditioners
20. ISO standard page for ISO 5149-1:2014, refrigerating system safety and environmental requirements
21. EN 12900 standard catalogue entry, compressor rating conditions
22. F-gas Regulation (EU) 2024/573, fluorinated greenhouse gas regulation
23. target site news and article index, the site's own article listing
24. GMCC and Welling manufacturer site, the manufacturer of the SM series rotary compressor
25. IEA, The Future of Cooling, industry reference on air conditioning demand and efficiency