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Mitsubishi Electric R410A Manual

Refrigerant
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A guide to
R410A

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  Summary of Contents for Mitsubishi Electric R410A

  • Page 1 A guide to R410A...
  • Page 2 Natural Choice...
  • Page 3: Table Of Contents

    >> Contents The facts on R410A refrigerant A brief history of refrigerant R410A in detail Ensure correct system evacuation When using copper pipework The right tools Summary >>...
  • Page 4: The Facts On R410A Refrigerant

    - which simply isn’t true. Whilst R410A can provide some small advantages in efficiency, it is technology itself that is the largest contributor towards the steady increase in ever important COP’s.
  • Page 5 R410A refr igerant has some excellent benefits to offer This guide aims to provide you with a better understanding of R410A and to subsequently improve your effectiveness in today’s air conditioning industry. Page 3...
  • Page 6 A brief histor y Since 1985 it’s been well documented that the ozone layer surrounding the earth has been diminishing. Scientific evidence suggests man-made chemicals are responsible for creating the hole in the ozone layer and that they’re likely to add to global ozone depletion.
  • Page 7 O zone Depletion Potential (O DP). R410A is a Hydrofluorocarbon (HFC ) Systems using R410A refrigerant run at a pressure of approximately 1.6 times that of similar systems using R22 and the energy efficiency is comparable. The R410A refrigerant is a 50:50 mixture of R32 and R125.
  • Page 8 R410A in detail R410A is a Zeotropic blend of two refrigerants R32 50% R125 50% The phase change of R410A Pressure Sub-Cooling - Compression mixtures takes place at [bar] - Condenser an almost constant temperature - Expansion - Evaporation during the liquefaction or evaporation process.
  • Page 9 R410A has zero O zone Depletion Potential (O DP) W ith the relatively high density and high efficiency of R410A , it is possible to reduce the size of system components such as condensers, compressors, evaporators and piping, etc. As operating pressures are higher compared to that of R22 and R407c, all system components must all be designed for suitability with R410A.
  • Page 10: Ensure Correct System Evacuation

    Moisture will result in adverse reactions in the refrigerant circuit. > The polyester oils used in the R410A refrigeration systems are hydroscopic, which means that they absorb moisture from the air. To prevent chemical reactions in the system, any moisture must be removed at all costs.
  • Page 11 S tep 1 45 PSI (N 2) - Test for a minimum of 3 minutes S tep 2 220 PSI (N 2) - Test for a minimum of 3 minutes S tep 3 450 PSI (N2) - Test for a minimum of 24 hours (if using R410A) Page 9...
  • Page 12 Tr iple evacuation 6 easy steps S tep 1 Evacuate the system to 1000 microns from both service valves. To measure the vacuum a vacuum gauge must be used at all times - do not use a system manifold gauge S tep 2 Break the vacuum with O FN to 14 PSIG S tep 3 Evacuate to 500 microns S tep 4 Repeat Step 2...
  • Page 13: When Using Copper Pipework

    When using copper pipework > Use only copper pipes with the correct wall thickness - please refer to your usual copper pipe supplier for detail > Make sure you cut the copper pipe with a proper pipe cutter only > Remove any burrs with the utmost care >...
  • Page 14: The Right Tools

    The right tools The right tools are required in to enable the refrigeration system to be properly evacuated and dried. These include: > R410A Manifold Gauges > Flaring Tool > Torque Wrench > Vacuum Pump > Refrigerant Weighing Scales Page 12...
  • Page 15 R410A. Manifold gauges with sight gauges should never be used due to the higher operating pressures, unless specified for use on R410A. N itrogen Pressure Gauge A higher range N itrogen Regulator must be used due to the higher...
  • Page 16 FlaringTool A suitable Flaring tool to be used so as not to compromise the integrity of the copper when flared. Torque W rench Torque wrenches must be used at all times to tighten flares in accordance with manufacturers guidelines. O xygen free nitrogen for brazing O FN to be used at all times during brazing to prevent oxidation within the copper pipework.
  • Page 17: Summary

    Lower indirect global warming potential (CO 2 production at power station) than R22 and R407c If you follow the guidelines contained within and carry out good refrigeration practices at all times, then working with R410A will be no different from working with previous refrigerants. Know it and use it!
  • Page 18 All text, illustrations, diagrams and examples in this guide are only intended to help with the handling and proper use of the refrigerant R410A. The information contained in this brochure has been carefully researched and checked and is considered correct at time of going to press.