Substitution ofrefrigerant type shall not be made without:(a) permission of the regulatory authority when required (b) compliance with this Code and(c) verification of design compliance with the requirements of Item (b) by(i) the original equipment manufacturer or(ii) a professional engineer.Before substitution of refrigerants of any kind, and in this case, the use of hydrocarbonsrefrigerants, all individuals involved must review the following information carefully:Note: The following is an excerpt from CSA Standard B52 that provides clauses applicable to flammablerefrigerants. Currently,hydrocarbon refrigerants are being promoted as drop-in replacements to refrigerationsystems that have been designed for other classes of refrigerants.

B52 Information BulletinUse of Hydrocarbon RefrigerantsIn New Equipment and as drop-in replacements for other classes ofrefrigerants in Existing SystemsCSA Standard B52-99, Mechanical Refrigeration Code, establishes requirements for thedesign, construction, installation and maintenance of mechanical refrigeration systems,so as to minimize the risk of injuries to workers and the general public.CSA B52 has specific provisions for the use of hydrocarbon refrigerants.

Csa refrigeration code