GMCC EKPM310D85UMTR Rotary Compressor: R32 Variable Vapor Injection Specifications and Selection Guide

Key facts at a glance

What is the GMCC EKPM310D85UMTR?

GMCC EKPM310D85UMTR is a hermetic rotary compressor that runs on R32 refrigerant with DC inverter drive, twin cylinders, variable volume operation and vapor injection. GMCC files it under the R32 variable volume vapor injection section of its rotary compressor catalogue, in the M series, and independent supplier documentation describes it as an R32 inverter compressor for heat pump heating duty. GMCC publishes the wider range in its official product centre. Within the catalogue it sits in the GMCC rotary compressor range, part of the broader line of rotary compressors for air conditioning and heat pump duty.

Variable volume control plus vapor injection is the combination that matters here. The compressor can change its swept volume and inject intermediate pressure vapor, so it holds capacity and efficiency across a wider pressure ratio than a fixed-volume machine. That is why the same catalogue prints it in a section aimed at heat pump and air conditioning equipment rather than at a single fixed duty point.

Technical specifications

Every figure above comes from one row of one table, read under one stated test condition. That single basis is what makes the numbers usable. When a supplier quotes a capacity for this model without naming the condition, the number cannot be compared with anything, including another supplier's number for the same model.

R32 versus R410A: the same displacement block, two refrigerants

The most useful comparison for a buyer is not against a competitor. It is against the R410A model that GMCC builds on the same body. The catalogue prints both in one edition under the same SEER60 condition.

Read the two 310 rows against each other. Displacement, height and both port sizes are identical, so the mechanical envelope is unchanged. Capacity rises from 9,080 W to 9,635 W, a gain of about 6.1 percent. Input power rises from 2,550 W to 2,650 W, about 3.9 percent. COP moves from 3.56 to 3.64, about 2.2 percent. Those percentages are arithmetic on the two catalogue rows and are not a manufacturer statement.

The reason the refrigerant swap buys anything at all is composition, not marketing. R32 is a single substance, difluoromethane, with the formula CH2F2, according to the refrigerant designations published alongside ANSI/ASHRAE Standard 34. The same designation table lists R410A as a blend of R-32 and R-125 at 50.0 and 50.0 percent by mass. A 50/50 blend has temperature glide and a different pressure and density profile from either component, which is why a compressor optimised for one refrigerant does not transfer its rating to the other unchanged.

Why the environmental argument is now a purchasing argument

R32 carries a 100 year global warming potential of 675 and sits in safety group A2L, according to the European Commission's summary of climate friendly alternatives to F-gases, which takes its GWP values from Annex I and II of Regulation (EU) 2024/573. The same Commission page records that from 1 January 2025, single split air conditioning systems containing less than 3 kg of F-gases with a GWP of 750 or more are prohibited in the European Union.

R32 at 675 falls below that 750 threshold. A refrigerant above it does not, so the choice of refrigerant now decides whether a product family can be placed in that market at all. That makes R32 a procurement requirement rather than a preference, and it is the strongest single reason to look at the EKPM310D85UMTR instead of the R410A model beside it in the same catalogue table.

Safety group A2L is a design constraint that comes with the benefit. A2L refrigerants are classified as lower flammability, so charge limits, ventilation and leak detection in the finished equipment must follow the applicable A2L rules. Buyers should confirm those requirements against the standard editions in force in their market before committing a design.

Why variable vapor injection matters in cold weather

Vapor injection takes refrigerant vapor from the circuit and feeds it back into the compression process at an intermediate pressure. The effect is to lower discharge temperature and to keep mass flow up when the pressure ratio across the compressor grows. GMCC publishes four claims for the R32 variable volume vapor injection section that contains this model:

• Heating capacity improved by 85% at an ambient temperature of -15 °C, with outlet air temperature up to 50 °C.
• Rapid cooling and heating, saving half the time.
• Variable vapor injection technology achieves high efficiency operation.
• Double capacity at half speed: large capacity is reached without the high frequency noise problem.

These are manufacturer claims for the section as a whole, not third party test results for EKPM310D85UMTR alone. Quote them as GMCC published figures for the family, and do not restate them as measured performance of a specific unit. The half speed claim is the one worth understanding in selection terms: reaching a target capacity at lower rotational speed is what removes the high frequency tone, so it is a noise claim and an efficiency claim at the same time.

What the model code EKPM310D85UMTR tells you

GMCC publishes model naming rules in its rotary compressor catalogue, split into a structure part and a power part. The verified entries available from the two catalogue editions reviewed here are:

Two further observations come from reading the catalogue tables rather than from the legend. First, the M in this string is the series letter that the catalogue prints in its own series column for this table. Second, across the R32 and R410A sections, otherwise identical series and displacement blocks are written with different second letters, EK in the R32 rows and EA in the R410A rows. That pattern is visible by comparing the two tables above. It is offered as an observation about this catalogue edition, not as a published decode rule.

One caution. The catalogue editions reviewed for this guide do not map every position of every model string. Do not decode displacement, refrigerant or electrical rating from the letters alone. Ask for the GMCC datasheet for the exact string EKPM310D85UMTR before committing to a design.

Where it sits in GMCC's R32 variable vapor injection family

Source: GMCC rotary compressor catalogue, R32 variable volume vapor injection section, test condition SEER60. The table uses displacement, height and connection sizes alongside the rated figures because those physical dimensions do not move with test condition.

EKPM310D85UMTR sits second from the bottom of this four model ladder. Both of its neighbours are reachable from stock on this site: the smaller KTN150D30UFZ covers R32 twin cylinder inverter duty at 14.9 cm³/rev, and the KTF310D43UMT is the R32 twin cylinder model closest to it at 30.8 cm³/rev. Buyers weighing the refrigerant switch rather than the frame size can compare against the R410A side of the range: the EAPM150D55UFZ in the same M series, and the largest enhanced vapor injection model held, the EAPQ580D66UNT at 58 cm³/rev. The full set of GMCC model guides on this site covers the older strings.

Which applications suit the EKPM310D85UMTR?

• Air source heat pump heating. GMCC files the R32 variable vapor injection section under heat pump duty, and supplier documentation describes this model as a heat pump heating compressor. The 85 percent heating capacity claim at -15 °C ambient is aimed directly at this duty.
• Heat pump water heaters. The model is recorded as an R32 compressor suitable for heat pump water heaters in the product case material published for this family. The 50 °C outlet air figure in the catalogue supports the hot water side of that application.
• Commercial and multi split air conditioning. The catalogue places the section in the inverter air conditioning compressor chapter, and the module rating of 9,635 W at SEER60 suits larger multi split and light commercial systems rather than a single small split.
• Refrigerant transition projects. Where a product family must move off R410A to stay inside a GWP threshold, the shared 30.6 cm³/rev displacement block and the shared 325 mm height and 9.8 by 16.2 mm ports make this the natural drop in candidate against EAPM310D85UMTR.
• Noise sensitive installations. The half speed claim addresses the high frequency tone that inverter compressors produce when pushed to the top of their speed band.

Selection checklist

1. Confirm the refrigerant and circuit: R32 is a single component HFC, so oil, expansion device and pipe sizing must be specified for R32 rather than carried over from an R410A design.
2. Confirm you can meet A2L requirements. Group A2L carries lower flammability classification, so charge limits, ventilation and leak detection in the finished equipment must comply with the standard edition in force in your market.
3. Check the refrigerant against the market. R32 at GWP 675 sits below the 750 threshold that the European Union applies to single split systems from 1 January 2025. Verify the schedule that applies where the equipment will be placed.
4. Size on capacity at the design point, not the catalogue maximum. 9,635 W is a SEER60 figure with a stated condition attached.
5. Verify the mechanical envelope: 325 mm height, 9.8 mm discharge and 16.2 mm suction pipe inner diameter.
6. Confirm drive compatibility. This is an inverter compressor, so drive and control logic must be matched to it, and variable volume control adds a requirement the drive must support.
7. Request the GMCC datasheet and performance table for the exact string EKPM310D85UMTR, plus the certificate set you need for your market.
8. Confirm warranty and documentation terms in writing, including the test report status.

Frequently asked questions

Is the GMCC EKPM310D85UMTR an inverter compressor?

Yes. It is a DC inverter rotary compressor, so its speed is set by an external drive rather than by the mains frequency. That is what allows the capacity to modulate with load instead of switching on and off. The model also uses variable volume and vapor injection, so both the speed and the working volume can change.

What refrigerant does the EKPM310D85UMTR use?

It uses R32. GMCC lists it in the R32 variable volume vapor injection section of the rotary compressor catalogue. R32 is a single substance, difluoromethane, rather than a blend, so there is no temperature glide to account for when charging. An R32 system must be designed and serviced with R32 equipment and cannot be charged with R410A or R22.

What is the displacement of the EKPM310D85UMTR?

The GMCC rotary compressor catalogue lists the displacement as 30.6 cm³/rev for this exact model string. The catalogue also gives 9,635 W capacity, 2,650 W input power and a COP of 3.64 W/W for the same row under the SEER60 test condition. Confirm against a GMCC datasheet before using displacement in a design calculation.

Can the EKPM310D85UMTR replace an R410A compressor of the same size?

It shares its 30.6 cm³/rev displacement block, 325 mm height and 9.8 by 16.2 mm ports with EAPM310D85UMTR, so the mechanical envelope matches. Replacement is not automatic: the refrigerant, oil, expansion device and drive must all be specified for R32, and A2L design rules apply. Compare the two rows in the comparison table before treating it as a drop in.

What is the COP of the EKPM310D85UMTR?

The catalogue gives a COP of 3.64 W/W at the SEER60 test condition, against a cooling capacity of 9,635 W and an input power of 2,650 W. COP is only meaningful with its test condition attached, so ask any supplier quoting this model for the condition behind their figure before comparing it with anything.

Is the EKPM310D85UMTR suitable for heat pump water heaters?

Yes. The model is recorded as an R32 compressor suitable for heat pump water heaters in the case material published for this family, and GMCC files the section in heat pump heating duty with a published 85 percent heating capacity improvement at -15 °C ambient. Heat pump deployment is expanding globally, and the IEA estimates that heat pumps could cut global carbon dioxide emissions by at least 500 million tonnes in 2030, as set out in The Future of Heat Pumps.

Data sources and verification notes

This guide labels the strength of every source it uses.

1. GMCC Rotary Compressor Catalogue (PDF, 2024 edition). Used for the model naming rules, the R32 variable volume vapor injection family table, this model's specification row, the R410A comparison rows and the four section feature claims. Primary source. Current editions are published on the GMCC official downloads page.
2. GMCC Emerging Markets Rotary Compressor Catalogue (PDF, printed February 2022). Used for the model naming legend entries R, L, T, V, Y and P. Primary source.
3. Qishanr Technologies, GMCC Toshiba Rotary Compressors case page. Used for the statement that EKPM310D85UMTR supports R32 and suits heat pump water heaters. Company published material.
4. European Commission, climate friendly alternatives to F-gases, stationary air conditioning and heat pumps (page last updated 9 April 2025). Used for the R32 global warming potential of 675, the A2L safety group, and the 1 January 2025 GWP 750 threshold for single split systems. Values are taken from Annex I and II of Regulation (EU) 2024/573. Regulatory source.
5. Applicable standards. ANSI/ASHRAE Standard 34 refrigerant designations are used for the R32 and R410A compositions. IEC 60335-2-34:2024 covers the safety of sealed motor compressors, ISO 5149-1:2014 covers refrigerating system safety and environmental requirements, and AHRI 540 covers performance rating of positive displacement refrigerant compressors. None of these is a certification held by this model, and no certificate is claimed here.
6. Regulatory and market sources. Regulation (EU) 2024/573 on fluorinated greenhouse gases, and The Future of Heat Pumps from the IEA. Used only for refrigerant regulation and heat pump market context.
7. Supplier listings and distributor pages (weak). A marketplace listing for EKPM310D85UMTR and several Chinese distributor pages were read as corroboration that the model is traded and that it is an M series R32 inverter compressor for heat pump duty. One marketplace listing gives a displacement of 14.0 cm³/rev and a capacity of 4.37 kW for this model, which contradicts the manufacturer catalogue. That listing is treated as a copied specification block and none of its figures are used.

Explicitly not verified. The global warming potential of R410A is not stated in the regulatory page used here, so no figure for it appears in this guide. The decode of the E and K second letters is an observation from the catalogue tables, not a published naming rule. The rated figures are catalogue data at SEER60 and are not third party test results. No certificate held by this model has been sighted.

How to close the gaps. Request from GMCC or an authorised distributor a datasheet and a performance table for the exact string EKPM310D85UMTR, stating refrigerant, displacement, rated condition, capacity, power, COP, connection sizes, mass and the electrical rating. Add the figures to this file when they arrive and mark them verified.