1104.9 Changing Refrigerants — 2025 California Mechanical Code

Changes of refrigerant in an existing system to a refrigerant with a different refrigerant designation shall only be allowed where in accordance with Section 1104.9.1 through Section 1104.9.4. [ASHRAE 15:5.3]

1104.9.1 Approval. The change of refrigerant shall be approved by the owner. [ASHRAE 15:5.3.1] 1104.9.2 Procedures. The change of refrigerant shall be in accordance with one of the following:

(1) Written instructions of the original equipment manufacturer.

(2) An evaluation of the system by a registered design professional or by an approved nationally recognized testing laboratory that validates safety and suitability of the replacement refrigerant.

(3) Approval of the Authority Having Jurisdiction.

[ASHRAE 15:5.3.2]

1104.9.3 Replacement Refrigerant of Same Clas- sification. Where the replacement refrigerant is classified into the same safety group, requirements that were applicable to the existing system shall continue to apply.

[ASHRAE 15:5.3.3]

1104.9.4 Replacement Refrigerant of Different Classification. Where the replacement refrigerant is classified into a different safety group, the system shall comply with the requirements of this chapter for a new installation, and the change of refrigerant shall require Authority Having Jurisdiction approval. [ASHRAE 15:5.3.4]