DRAFT COPY

DATE: September 2011 Rev. 1 REFERENCE DOCUMENT NO. RD-0027-E

I. REFRIGERANT PROPERTIES (Cont’d)

B)The solubility of water in R410A is comparable to that of water in R22. It is necessary to keep the system dry. See Section II, B.

C)Extensive investigation and testing has been conducted to determine that R410A is compatible with all materials used in Tecumseh compressors designed for use with R410A refrigerant.

C)Compatibility

Extensive investigation and testing have been conducted by Tecumseh Products Company to determine that the polyol ester and polyvinyl ether lubricants approved by Tecumseh are compatible with all materials used in Tecumseh hermetic compressors. Contact your Tecumseh sales representative for the latest list of approved oils. (Policy Bulletin No. 105)

II.SYNTHETIC LUBRICANTS: POLYOL ESTERS (POEs) and POLYVINYL ETHERS (PVEs)

A)Miscibility

1.Miscibility is the ability of the lubricant and the refrigerant to mix. This miscibility is a very important factor in providing proper heat transfer and in returning lubricant to the compressor in a refrigeration system over its range of operating temperatures.

2.R410A and Mineral oils (MO) are not miscible

3.Polyol Ester (POE) as well as Polyvinyl Ether (PVE) oils and R410A are miscible.

B)Moisture

1.Polyol Ester and Polyvinyl ether oils are 100 times more hygroscopic (ability to absorb moisture) than MO or SA oils. This moisture is difficult to remove even with heat and vacuum.

2.Utmost care must be taken to prevent moisture from getting into the refrigeration system. Do not leave the compressor or system open to the atmosphere for longer than 10 minutes maximum. The preferred method of assembly would be to remove system component plugs and caps just prior to brazing. The maximum system moisture content after completing system processing should be 80 PPM. After running the system with the appropriate filter-drier installed, the system moisture level should be 50 PPM or less. These levels are based on measuring moisture in liquid refrigerant samples taken from the system.

3.Always use an appropriate filter-drier in the system when using R410A. (See section on FILTER-DRIERS.)

III. SYSTEM DESIGN

A)Compressor Selection

Tecumseh is continuing to test and approve R410A compressors with the compatibility of oil, refrigerant, and materials in mind. These compressors will have the letter “B” as the refrigerant designator, e.g. RGA5512BXA.

B)Expansion Valve Selection

Expansion valve manufacturers have designed product specifically for use with R410A. Consult them for their recommendations.

C)Capillary Tubes

R410A requires approximately 15% less capacity for the metering device compared to R22. This information can be used when selecting the appropriate capillary tube.

D)Filter-Driers

Tecumseh requires that an appropriate filter-drier be used on every R410A system. (See section on FILTER-DRIERS.)

FILTER-DRIERS

A)Synthetic POE lubricants used with R410A are prone to hydrolyze with moisture resulting in the formation of acids. Tecumseh requires that an appropriate filter-drier be used in every R410A application.

B)Molecular sieve filter-driers which are compatible with R410A should be used..

C)For specific filter-drier selection, contact your filter- drier supplier.

© 2011 Tecumseh Products Company. All rights reserved.

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Tecumseh R410A manual III. System Design, Filter-Driers
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R410A specifications

Tecumseh R410A is a synthetic refrigerant commonly used in air conditioning systems, particularly in residential and commercial applications. As one of the most efficient refrigerants available, R410A plays a crucial role in enhancing the performance of HVAC systems while adhering to environmental regulations.

One of the primary features of R410A is its high energy efficiency. Unlike many older refrigerants, R410A is designed to operate at higher pressures, which allows for a more efficient heat exchange process. This characteristic not only improves the performance of cooling systems but also contributes to lower energy consumption, making it an environmentally friendly choice. The high efficiency associated with R410A translates into reduced electricity bills for users while minimizing the carbon footprint.

Another significant characteristic of R410A is its low ozone-depleting potential (ODP). Unlike refrigerants such as R22, which have been phased out due to their adverse effects on the ozone layer, R410A is a non-ozone-depleting substance. This makes it compliant with the Montreal Protocol's environmental standards, promoting its use in modern refrigeration and air conditioning systems.

Tecumseh R410A also boasts excellent thermodynamic properties, which contribute to its effectiveness in a variety of temperature ranges. The refrigerant has a higher cooling capacity compared to its predecessors, allowing for better performance in both high and low ambient temperature conditions. This versatility makes R410A an ideal choice for various applications, including residential air conditioners, heat pumps, and commercial refrigeration systems.

The refrigerant is also characterized by its compatibility with many compressor technologies. Tecumseh has developed specific compressors designed to work seamlessly with R410A, ensuring reliability and efficiency in operation. Additionally, R410A's chemical stability means it does not decompose easily, offering longevity in HVAC systems.

Overall, Tecumseh R410A stands out in the refrigeration market due to its energy efficiency, low environmental impact, and robust performance characteristics. With the ongoing push for sustainable refrigerants, R410A continues to be a leading choice for modern air conditioning systems, promoting both comfort and environmental responsibility.
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