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  4. Obsolete Refrigerant Retrofit from R22 to R407C

Obsolete Refrigerant Retrofit from R22 to R407C

Standard refrigerant retrofit from R22 per industry standards.

This is a standard refrigerant retrofit from R22, wherein we remove, or recover, the existing obsolete R22 refrigerant from the system and replace it with a newer more efficient and less harmful refrigerant.

Scope of Work

  1.   Due to the phase-out and obsolescence of existing R22 refrigerant, retrofit is required due to cost and procurement limitations.
  2.   Perform required lockout/ tagout safety protocol per NFPA 70E of all high-voltage electrical circuits prior to beginning work on the existing unit.
  3.   Recover and dispose of existing R22 refrigerant and liquid line drier filter per EPA regulations (40CFR Part 82, Subpart F) under Section 608 of the Clean Air Act.
  4.   Flush the open system with dry nitrogen to remove potential moisture and non-condensable substances.
  5.   Replace liquid line drier filter with a new one of comparable size and type.
  6.   Pressure test all newly-soldered copper connections to 200psi to ensure that all solder joints are leak free prior to evacuation.
  7.   Add applicable quantity of Super Change oil stabilizing additive to the suction side of the compressor while not under pressure.
  8.   Evacuate system to 500 microns per EPA and ASHRAE industry recommendations.
  9.   Recharge system to 90% of listed system capacity and adjust charge as necessary to reflect manufacturer's superheat and subcool specifications.
  10.   Monitor refrigerant pressures as necessary and record baseline operational data.
  11.   Full operational testing upon completion prior to site departure.

This article has been shared by Direct Service, Construction and Design to specifically accommodate our intended clientele.  The intent of sharing this information is to better inform the public of these general topics, expand knowledge and safety for all and provide crucial information in regard to their MEP and building systems and/or assets. It is NOT our recommendation that any article recommendations or how-to scenarios be attempted by anyone other than a qualified or competent person.