IV. System Processing, Compressor Handling

DRAFT COPY

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

IV. SYSTEM PROCESSING

A)Compatibility

1.Polyol Ester and Polyvinyl ether oils are good solvents and have a tendency to wash system processing materials such as drawing components, rust inhibitors, and cleaning compounds from system surfaces. Care must be taken to remove such processing materials from all the system components.

2.Residual chlorinated materials should be considered system contamination and eliminated from all internal surfaces of the refrigeration system.

B)Compressor Handling

1.To prevent moisture from getting into the compressor, the plugs should be left in the tubes until the line connections are ready to be brazed.

C)Evacuation

1.The evacuation levels for R410A systems should be the same as R22 systems (minimum of 200 microns at the system and pulled from both the low and high pressure sides of the system). If care is not taken to prevent moisture from entering the system components prior to assembly, evacuation could be expected to take longer to achieve acceptable limits of system moisture and non- condensables. Tecumseh recommends a maximum of 2% non-condensable and 80 PPM moisture. The completed system should have a moisture level of 50 PPM or less after running with an appropriate filter-drier installed. These levels are based on measuring moisture in liquid refrigerant samples taken from the system.

2.Polyol Ester and Polyvinyl ether oils vaporize much less than mineral oils at the same level of heat and vacuum. Therefore, if oil vaporization was not a problem with the R22 system processing, it should not be a problem with the R410A system processing.

3.Consult your vacuum pump manufacturer to learn if your existing equipment may need to be converted for use on R410A polyol ester or polyvinyl ether systems.

D)Leak Testing

1.Use equipment which is designed for R410A detection or approved for R410A use by its manufacturer. Many leak detector manufacturers have R410A detectors on the market, and more are in development. Consult these manufacturers for their recommendations on their equipment.

E)Refrigerant Charging

1.Only use refrigerant charging equipment specifically designed for R410A. Operating pressures of R410A can be twice as high as other refrigerants.

2.R410A is a azeotrope and must be charged in the liquid state into the liquid line.

3.When pressure testing confirms that the system is free of leaks, evacuate the system thoroughly. Air, moisture and non- condensables must be removed to ensure long term reliability.

4.Break the system vacuum by charging R410A liquid refrigerant into the liquid line.

CAUTION: Never start the compressor while it is under a deep vacuum.

5.Charge the system using industry acceptable charging methods.

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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.