Sanyo C-2RN153H3A Rotary Compressor: R407C, Three-Phase 200 V, and What the Designation Can and Cannot Tell You

The C-2RN153H3A is a hermetic rotary compressor sold under the Sanyo brand, offered with a muffler, and described by its distributors as an R407C high-back-pressure machine for air conditioning on a three-phase 200 V supply at 50 or 60 Hz. What separates this model from the others in this series of articles is that no manufacturer rating row for it could be located: the designation is attested, the application class is attested, but the displacement, capacity, input power and coefficient of performance are not. This article therefore does two things instead of one. It sets out what the designation and the vendor statements establish, and it shows why the numeric block in the middle of the string cannot be read as a displacement.

Key facts at a glance

The table is deliberately split into two halves. The upper half records what three independent listings agree on or repeat. The lower half records what nothing in the public record states, and it is the reason this article does not quote a capacity.

What does the designation tell you, and what does it not?

The string has four parts. C is the Sanyo compressor prefix used across the rotary range. 2 is a series or generation marker. RN identifies a rotary family, and the H block at the end carries the refrigerant and supply variant. The numeric block 153 sits where a displacement would sit, which is exactly why it is tempting to read it as 15.3 cm3/rev.

The Sanyo rotary catalogue disproves that reading. Its refrigeration section prints model, displacement, capacity, power and coefficient of performance row by row, and within one family two different numeric blocks resolve to the same displacement:

Two points follow. First, 153 and 150 both resolve to 32.2 cm3/rev, so the block is not a displacement value in cubic centimetres per revolution written with an implied decimal point. Second, the block does not scale linearly with displacement either: the ratio of printed displacement to numeric block is 0.200 at 110, 0.210 at 153 and 0.208 at 223, so it is neither constant nor monotonic, which rules out a simple multiplier. The block is a capacity class label, and a class label can only be converted into a displacement by looking up the row that defines it.

For the C-2RN153H3A that row has not been found. Anyone who needs a displacement figure has to obtain it from the manufacturer's own table for the air-conditioning rotary range, not from the digits in the model string.

Which specification is correct?

The three located listings do not agree on everything, and the disagreement matters more than the agreement. Two describe an R407C three-phase machine at 200 V with a 50/60 Hz range, one of them explicitly as a high-back-pressure compressor for air conditioning. The third describes an R22 single-phase machine at 208 to 230 V.

Two against one is not proof, and it should not be treated as such: distributor listings are copied between sites, so two listings can share one error. What makes the R407C three-phase reading the working assumption here is that it is internally coherent: an R407C high-back-pressure rotary on a 200 V three-phase supply is a standard configuration for light-commercial air conditioning in the markets where Sanyo rotary compressors were sold, while an R22 single-phase variant of the same string would be a different product rather than a different label.

The catalogue supplies one piece of supporting evidence for the 200 V reading, though not for this series. It prints C-RHN153L8A under 380 V 50 Hz three phase and C-RHN153L3A under 200 V 50/60 Hz three phase, with an identical 32.2 cm3/rev displacement for both, so the single character before the final A separates the two supply variants. The target string carries 3 in that same position. That is a pattern in a sibling family rather than a published row for this model, so it supports the reading without settling it.

The practical consequence is simple. A buyer must confirm refrigerant and phase from the nameplate before ordering, because the two readings imply different system designs, different oils and different charge handling, and because a compressor ordered on the wrong reading cannot be corrected at the installation stage.

What does R407C change about the system?

R407C is a zeotropic blend of three refrigerants with a measurable temperature glide, which means it evaporates and condenses across a range of temperatures rather than at a single point. Two design consequences follow directly. The first is that heat exchanger design and charging must account for the glide, so a system built for an azeotropic refrigerant cannot simply be recharged with R407C and expected to perform to its original rating. The second is that leak detection and top-up practice differ, because a leaking blend changes composition, and the change is not recoverable by adding refrigerant to the low side.

R407C was the drop-in candidate for R22 in air-conditioning equipment during the transition period, which is consistent with a model family that spans both refrigerants in different variants. That history also explains the conflicting listings: a dealer catalogue that covers both an R22 generation and an R407C generation of the same frame can easily transpose a row.

For a buyer, the useful conclusion is that the refrigerant identifies the generation of the product rather than only its chemistry. An R407C C-2RN153H3A belongs to the later generation, and its oil and system materials follow from that.

Why does the three-phase 200 V supply matter?

A three-phase 200 V supply is the commercial wiring standard in Japan and in several Asian markets, and it is why the model exists in this configuration rather than as a single-phase unit. At air-conditioning capacities in the range this frame covers, three-phase input keeps the current per conductor low enough for standard commercial wiring, and it removes the starting current problem that large single-phase compressors create on weak supplies.

The 50/60 Hz range in the description adds a second practical point. A compressor specified for both frequencies can be fitted to equipment destined for either grid, which reduces the number of part numbers an assembler has to stock. It does not mean the same shaft speed: a rotary compressor running at 50 Hz turns at five sixths of its 60 Hz speed, and the capacity at the two frequencies will differ even though the model string does not.

The commercial reason this configuration exists at all is the growth of air-conditioning demand, for which the International Energy Agency's Future of Cooling report remains the standard reference on scale.

Because no rating row was located, this article does not quote a capacity at either frequency. The point stands as a warning: a supplier who quotes one capacity for a 50/60 Hz model without stating the frequency has not finished the specification.

What does high back pressure mean for the application?

Back pressure describes the pressure the compressor sees at the suction during normal running, and it maps onto the evaporating temperature band the machine is built for. High back pressure is the air-conditioning band, where evaporating temperatures sit above freezing. Low back pressure is the freezing band, where they sit well below it. The distinction is not a preference: a high-back-pressure compressor run at freezing evaporating temperatures will overheat, because the returning gas is too thin to cool the motor.

The Sanyo rotary range makes the split visible. The refrigeration section of the catalogue prints models such as the C-RHN153L8A at 1920 W of capacity with a coefficient of performance of 1.07, rated across evaporating temperatures from minus 40 to zero Celsius, a low-back-pressure duty with a low efficiency, as freezing duty always has. An air-conditioning machine of similar frame size runs at a much higher coefficient of performance because it is lifting heat across a far smaller temperature difference.

That contrast is the reason the H in the model string deserves attention. It places the compressor in the air-conditioning band, which is where the application list on the listings puts it, and it rules out treating the model as a freezer compressor regardless of what a generic catalogue page might suggest.

How should a buyer specify this model?

Two of these steps are unusual in a compressor enquiry, and both exist because the model has no public rating row: the displacement and the rated condition have to be asked for rather than looked up.

Step 5 is the one buyers most often try to skip. Even inside the family the displacement is a printed field on the model page rather than something the string encodes, and the smallest frame shows it plainly: the C-RHN78E3A prints 13.3 cm3/rev against a numeric block of 78, which no decimal-point reading of the digits would produce.

Which references frame this class of machine?

Six references frame the specification work. EN 12900 is the European standard for rating positive displacement refrigerant compressors, and it exists to make a capacity figure comparable by fixing the conditions under which it is measured; a model without a published row cannot be checked against it. Regulation (EU) 2024/573 governs fluorinated greenhouse gases and attaches obligations to the equipment and its charge rather than to the compressor alone, which matters for an R407C machine because the blend's global warming potential sets the service regime. The ISO committee responsible for testing and rating of refrigerant compressors maintains the international counterpart of the rating framework. For the brand itself, the Panasonic global site is the corporate starting point, since Sanyo Electric has been part of Panasonic since 2011 and the compressor line moved with it. Within the supplier's own catalogue, the rotary compressor selection page sets out the rotary families by supply and duty class, which is the right place to look when the frame size has not been fixed, and the news and technical index collects the technical notes and release material that sit behind this series.

What is missing, and how would it be closed?

The gap is a manufacturer document for the air-conditioning rotary range that prints this designation with its displacement, capacity, input and coefficient of performance. The refrigeration catalogue located during research covers the C-RH and C-RHN families only, and its rows are low and medium back pressure duties on R404A; it cannot be used to infer anything about an R407C air-conditioning model beyond the naming behaviour already discussed.

Two routes would close the gap. A nameplate photograph would give the refrigerant, the supply, the displacement where it is stamped and the serial, which is enough to identify the exact variant. A page from the manufacturer's air-conditioning rotary catalogue would give the full row and the test condition. Until one of those arrives, this article is a specification guide rather than a data sheet, and it is written to be read that way.

How was this article checked?

Three vendor listings were read and compared field by field, and their disagreements are reported rather than averaged. A Sanyo rotary catalogue was downloaded and its text layer extracted, then searched for the designation; it returned nothing, which is why the family table in this article draws only on rows that the catalogue does print.

The naming analysis rests on the catalogue's own pairs: two different numeric blocks resolving to one displacement, and a ratio that does not scale linearly. That is enough to reject the 15.3 cm3/rev reading without needing the missing row.

No capacity, input power, coefficient of performance or displacement figure is stated for this model anywhere in the article, because none could be sourced. Where a family member's figures appear, they are labelled with that member's model number and duty.

Frequently asked questions

Is 153 the displacement in cm3/rev?

No. The Sanyo rotary catalogue prints 32.2 cm3/rev for C-RHN153L8A and the same 32.2 cm3/rev for C-RH150L3A, so two different numeric blocks resolve to one displacement. The block is a capacity class, not a value.

Is it R407C or R22?

Two listings say R407C and one says R22. The R407C three-phase reading is treated as the working assumption because it is internally coherent and matches the air-conditioning class, but the nameplate decides, and the two variants are different products.

Single phase or three phase?

Three phase at 200 V according to two listings, single phase at 208-230 V according to a third. The three-phase reading is consistent with a commercial air-conditioning application on a 200 V grid.

What capacity does it deliver?

No manufacturer figure was located, so none is quoted. A capacity without a stated evaporating and condensing condition would not be comparable even if a vendor printed one.

Can it be used for freezing duty?

No. The model is described as high back pressure, which is the air-conditioning band. Freezing duty needs a low-back-pressure machine, the catalogue's R404A rows show what that family looks like on paper, and the freezer variant page in the supplier's range shows what the build looks like in practice.

Why does the model come with a muffler?

The muffler is a discharge silencer fitted to reduce pulsation noise. It is an accessory of the build, not a separate variant, and it appears in the model description rather than in the string.

How can the missing data be obtained?

Ask for a nameplate photograph and for the manufacturer's air-conditioning rotary catalogue page for this designation. The nameplate settles refrigerant, phase and the stamped displacement; the catalogue page supplies the rated row and its test condition.

Where can comparable Sanyo rotary models be seen?

The supplier's Sanyo rotary range lists the models currently carried, and the individual pages print the displacement and capacity where those are known. Comparing a refrigeration model's row with this designation shows why duty class has to be settled before any number is used.

Sources