Mitsubishi PN25TACMT Rotary Compressor: 6370 W on R-410A, COP 2.95 and the Three-Phase Supply Code Behind the Name

The PN25TACMT is a three-phase R-410A rotary compressor rated at 6370 W of cooling capacity, 21,734 Btu/h, with a printed coefficient of performance of 2.95 and an energy efficiency ratio of 10.06. It belongs to the PN range built by Siam Compressor Industry and presented as backed by Mitsubishi Electric technology. What makes the model worth a close reading is not the headline capacity but the supply code: it is the only model in the catalogue printed under a 50/60 Hz three-phase 200/208-230 V heading, which is what separates it from the single-phase PN25 beside it.

Key facts at a glance

What does the PN25TACMT designation decode to?

The designation carries no manufacturer prefix, which is why the brand chain has to be stated rather than read off the string: the product page attributes the range to Siam Compressor Industry and describes it as backed by Mitsubishi Electric technology, and the manufacturer's global site is where the corporate relationship is documented.

The prefix is a range marker rather than a technology marker. Every model in the section is headed Specifications of PN Model, and the range spans five class numbers from 23 to 33, all rotary, all R-410A. Reading PN as a rotary family is therefore a statement about the section the model sits in, not about a letter code that happens to mean rotary.

The two digits are a class number, and the catalogue itself shows that they are not a capacity. Class 23 carries 5860 W in the 50 Hz single-phase group, but class 23 in the 60 Hz single-phase group carries 7165 W. The same number therefore names two different capacities depending on the supply group. Within one group the ordering is clean and monotonic, which is what a class number is for, but it cannot be read as a value in watts.

The T is the supply code, and it is the field that carries the model's identity. The catalogue splits the PN range into four electrical groups, and T is the code used in group d, headed 50/60 Hz at 200/200-230 V three phases. Only one model is printed in that group. That single fact explains why the model exists at all: it is the variant built for dual-frequency three-phase supplies, not a regional relabel of a single-phase unit.

The remaining characters form a build suffix in which the catalogue shows variation without publishing a key. Siblings carry AMT, BMT and CMT endings, and the character before that varies between A and B. No position template in the catalogue assigns meanings to those characters, so this article does not decode them. What can be said is narrower and useful: the suffix identifies a build, and two models of the same class with different suffixes are different builds rather than synonyms.

What does the printed rating row say?

The row appears twice, in two editions of the same catalogue, and the two printings agree on every figure that matters. The 2018 edition prints the model with 6370 W, 5478 kcal/h, 21,734 Btu/h, 2.41 HP, 1.80 kW, COP 2.95, EER 10.06, 23.7 kg and 900 cc of oil. The 2022 edition prints the same row with 5477 kcal/h, 2.4 HP, and adds the input columns that the earlier printing leaves blank: 2160 W and 8.20 A.

Those added columns can be tested against the printed efficiency. Dividing 6370 by 2.95 returns 2159, which is the printed 2160 to the nearest watt. Multiplying 6370 by 3.412 returns 21,734, the printed imperial figure. Multiplying 6370 by 0.860 returns 5478, the printed metric figure. Dividing 21,734 by 2160 returns 10.06, the printed EER.

A second edition of the same model page, on the supplier's other domain, prints the capacity as 6370 W and 21,734 Btu/h with the same supply string, so the second site agrees with the catalogue on the one number it states and adds no efficiency data of its own.

Four independent checks closing on printed columns is what allows the row to be quoted as a set rather than field by field. It also settles which number is the input: the catalogue layout loses column alignment in text extraction, and the arithmetic identifies 2160 W as input power without needing the header to survive. The nominal output columns confirm the same reading, since 1.80 kW is 2.41 HP at 1.341 HP per kW.

Where does the model sit in the PN range?

Nine models are printed across the four electrical groups, and their capacities overlap enough that the class number alone cannot be used for comparison. The table below reproduces the printed capacity, imperial capacity, coefficient of performance and efficiency ratio for each.

Two patterns stand out. Inside each supply group the class number orders capacity monotonically, with no exceptions across the ten rows. Across groups the ordering breaks immediately: the 60 Hz class 23 outrates the 50 Hz class 25 by more than 800 W. A buyer comparing class numbers across supply codes is therefore comparing different products, which is the single most common error this table is meant to prevent.

Three further Siam compressor pages exist on the supplier site beyond this model and its PN31 sibling. They are listed here as identity links only, without ratings, because their own pages do not print figures in the same columns as the PN table and cannot be placed in this ladder without guesswork.

The second pattern is that the PN25TACMT sits almost exactly on top of the 50 Hz single-phase PN25. The two differ by 10 W of capacity, 0.01 of COP and 0.04 of EER, which is rounding-scale separation. The pair is best read as one thermal design offered under two supply arrangements, not as two performance tiers.

Why does the three-phase supply matter here?

At this capacity the supply code changes what an installer can do rather than what the compressor delivers. A 6370 W cooling duty needs roughly 2.2 kW of electrical input, and a three-phase winding carries that input at 8.20 A per the printed current column, against the heavier single-phase current that the same nominal output implies. The benefit is conductor sizing, breaker selection and voltage drop over a long run, which is why three-phase models are common in light-commercial equipment even at capacities that residential single-phase hardware also covers.

The dual frequency heading adds a second practical advantage. One model is printed for 50 and 60 Hz operation at 200/208-230 V three-phase, so a single part number can serve export orders to both frequency zones. That reduces the SKU count for an assembler who ships the same outdoor unit to markets on different grids, and it removes the risk of fitting a 60 Hz compressor to a 50 Hz machine during a line change.

One caution belongs with that advantage. The catalogue prints a single capacity figure for this model even though its heading covers both frequencies. The figure aligns with the 50 Hz single-phase sibling to within 10 W, which suggests it is the 50 Hz rating, but the catalogue does not say so. Anyone quoting capacity at 60 Hz for this model is extending the row rather than reading it.

What applications fit a 6370 W R-410A rotary?

The product page lists the applications as air conditioning, drier, refrigeration and chiller. That list is the vendor's own description of where the range is used, and it is broad by design. Read against the printed rating, the air-conditioning and chiller entries are the natural fit: 6370 W is 1.81 nominal refrigeration tons, which lands at the small end of light-commercial split and ducted equipment and at the bottom of the small chiller range.

R-410A supports that reading. It is a near-azeotropic blend with a small temperature glide, and it is a high-pressure refrigerant designed for air-conditioning evaporating temperatures rather than for freezing duty. A compressor rated on R-410A with no printed evaporating temperature cannot be specified for low-temperature refrigeration on the strength of a vendor list that includes the word refrigeration. Anyone needing a frozen-food duty should ask for the evaporating range in writing before treating this model as a candidate.

The drier entry is best understood as a component role rather than a duty: a rotary compressor in a refrigerated dryer runs at air-conditioning evaporating temperatures and rejects heat to ambient, which is exactly the envelope this rating describes. That is why the same model can appear in both the air-conditioning and the drier columns of a supplier catalogue without contradiction.

Three-phase supply narrows the fit usefully. Equipment wired for 200/208-230 V three-phase is commercial by construction in most markets, so the model's realistic home is packaged rooftop units, ducted splits, small process chillers and dryer circuits, not residential wall units where single-phase power is the norm. Where a project needs a wider capacity band than the PN frame covers, the Siam scroll range is the next architecture to compare, and the comparison turns on whether the duty is steady or variable rather than on capacity alone.

R-410A equipment of this size is also where demand-side pressure shows up first. Small commercial cooling is the segment that the International Energy Agency's Future of Cooling report identifies as a driver of global cooling demand growth, which is why efficiency at the 6 kW point is treated as a policy-relevant number rather than a catalogue detail.

What selection advantages does the class carry?

The first advantage is supply flexibility at a fixed thermal size. The 10 W separation from the single-phase PN25 means a design can move between single-phase and three-phase supply without recalculating the coil, the expansion device or the refrigerant charge. In practice that lets one platform serve both a single-phase residential variant and a three-phase commercial variant.

The second is a printed efficiency that is internally consistent. COP 2.95 and EER 10.06 are not marketing claims about a best case: they reproduce from the capacity and input columns to the printed precision, so a tender document can quote them with the row as its basis.

The third is a compact rotating mass. At 23.7 kg for a 2.4 HP three-phase rotary, the model is light enough for a single installer to handle in a rooftop or ceiling void, which matters more for service cost than for design.

The fourth is the oil charge. The catalogue prints 900 cc of FV50S and names the oil type in a note, which is more than many catalogue rows provide; it lets a service engineer top up with the correct lubricant rather than a generic substitute.

What the rating row does not tell you

The first gap is displacement. The PN table has columns for capacity, input, nominal output, COP, EER, running capacitor, weight and oil, and no column for swept volume. That is unusual next to catalogue families that lead with displacement, and it means the model cannot be compared with a compressor from another maker on a displacement basis without asking the supplier for a figure that the catalogue does not print.

The second gap is the test condition. Note 1 names ASRE-T and then assigns conditions by code: V at single phase 220 V 50 Hz, N at single phase 220 V 60 Hz, Y at three phases 400 V 50 Hz. The T code used by this model is not among the three named. The row therefore inherits the section heading for its supply but not a stated evaporating and condensing condition, which is why capacity figures from this row should be quoted with the catalogue note attached rather than as stand-alone numbers.

The third gap is the frequency behind the capacity. A heading that covers 50 and 60 Hz, paired with a single capacity column, leaves the rating point ambiguous. The 10 W alignment with the 50 Hz sibling is evidence, not a statement.

The fourth gap is mass. The catalogue prints 23.7 kg in both editions, while the product page prints 22.1 kg. The difference of 1.6 kg is too large to be rounding and too small to be a different machine. It is most likely a net versus packed distinction, but neither document says which, so both figures are reported here and neither is preferred.

The fifth gap is acoustic and vibration data. Neither the catalogue row nor the product page prints a sound power or sound pressure level, so a specification that needs a noise figure must obtain it from the supplier rather than infer it from the frame size.

Which standards and rules apply to a compressor of this class?

Three references frame the model. EN 12900 is the European standard for rating positive displacement refrigerant compressors, and it fixes the reference conditions under which a capacity and a coefficient of performance are comparable; a catalogue row that names its own test condition is doing what that standard exists to make possible. Regulation (EU) 2024/573 governs fluorinated greenhouse gases, and it attaches obligations to the equipment and to the refrigerant charge rather than to the compressor alone. The ISO committee responsible for testing and rating of refrigerant compressors maintains the international counterpart of the rating framework.

None of the three tells a buyer what this compressor will do in a particular system. What they do is define the vocabulary in which the catalogue row can be checked, which is why the row's arithmetic closure matters more than its headline number.

How was this article checked?

The row was read from two editions of the same catalogue rather than one, and the two were compared field by field. Where the 2018 printing leaves the input and current columns blank in text extraction, the 2022 printing supplies 2160 W and 8.20 A, and the four arithmetic checks described above confirm that the pair belongs to this row.

The product page was read separately. It confirms the refrigerant, the supply, the oil charge in litres and the mass, and it adds an application list. It does not print capacity, input or efficiency, so no figure in this article is sourced from it except the mass alternative and the application list.

The sibling page was checked the same way and did not reconcile: its 29,002 Btu/h at 2,310 W cannot be matched to the catalogue's 27,467 Btu/h row, so no figure from it is used except the fact that the page exists and prints a three-phase supply.

No figure for displacement, sound or vibration appears in this article, because none is printed in either document. A third-party listing that quotes a displacement for this model was found during research and was not used, since it could not be traced to a manufacturer document.

Frequently asked questions

Is the PN25TACMT single phase or three phase?

Three phase. The catalogue prints it in the group headed 50/60 Hz at 200/200-230 V three phases, and the product page states 3Ph in the voltage field. A single-phase model of the same class exists, the PN25VAAMT, and it is a different product with a different input current.

Is 25 the capacity in some unit?

No. The digits are a class number, and the catalogue proves they are not a value by printing class 23 at 5860 W in one supply group and at 7165 W in another. Within a single supply group the number orders capacity monotonically, which is its only reliable reading.

What refrigerant and oil does it use?

R-410A, with 900 cc of FV50S oil per the catalogue oil column and note 3. The product page states the same charge as 0.9 L and the same refrigerant, so the two documents agree on this field.

How many tons is 6370 W?

6370 W is 21,734 Btu/h, which is 1.81 nominal refrigeration tons at 12,000 Btu/h per ton. The tonnage is a derived label, not a printed rating, and it should not be substituted for the capacity figure in a specification.

Does it really run at both 50 and 60 Hz?

The catalogue places it under a 50/60 Hz heading, so the model is offered for both supplies. The single printed capacity column does not state which frequency it belongs to, and it matches the 50 Hz sibling to 10 W. Treat 6370 W as the figure to confirm with the supplier for the frequency you are designing for.

Why does the product page say 22.1 kg when the catalogue says 23.7 kg?

The two documents disagree and neither explains the basis. The difference is consistent with a net versus packed mass distinction, but that is an inference. For freight and mounting calculations, ask the supplier to confirm which figure is net.

Can it be used for low-temperature freezing?

Not on the evidence available. The vendor application list includes refrigeration, but the catalogue prints no evaporating temperature and R-410A is an air-conditioning refrigerant by design. A freezing duty needs a written evaporating range from the supplier before this model is considered.

Where can the family be compared?

The closest sibling is the PN31YBAMT, the only other PN rotary page on the supplier site, a 50 Hz three-phase model at 380-415 V. Its page prints 29,002 Btu/h at 2,310 W, while the catalogue prints 27,467 Btu/h for the same designation and implies roughly 2,650 W of input at the printed COP. The two do not reconcile, and the page figure sits close to the catalogue's PN33VABMT row, which suggests a mis-keyed field rather than a second rating. Use that page for identity and supply, not for capacity.

Where can a wider selection be compared?

Two routes serve different questions. The rotary compressor selection page groups rotary frames by supply and class, which is the right place to check what sits on either side of 6370 W before committing to a frame size. The Siam rotary compressor range page lists the models the supplier currently carries, which is the right place to confirm that a designation is available rather than only printed in a catalogue.

Is there a technical index for further reading?

Yes. The news and technical index carries the supplier's technical articles and release notes, including the material on rotary families and refrigerant transitions. It is the place to check whether a figure quoted in a catalogue row has been superseded by a later note.

How should an enquiry for this model be written?

Quote the full string PN25TACMT, the supply as 200/208-230 V three phase 50/60 Hz, the frequency you are designing for, and the evaporating and condensing conditions you need it rated at. Ask for the displacement and the acoustic data, since neither is printed. A capacity-only enquiry cannot be answered unambiguously, because the class number is shared across supply groups.

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