J2772_201909 Measurement of Passenger Compartment Refrigerant Concentrations Under System Refrigerant Leakage Conditions

Revised

09/03/2019

Features
Issuing Committee
Scope
Content
This Standard is restricted to refrigeration circuits that provide air-conditioning for the passenger compartments of passenger and commercial vehicles.
This Standard includes analytical and physical test procedures to evaluate refrigerant concentration inside the passenger compartment. In the early phases of vehicle evaluation, usage of the analytical approach may be sufficient without performing physical tests.
The physical test procedure involves releasing refrigerant from an external source to a location adjacent to the evaporator core (inside the HVAC module). An apparatus is used to provide a repeatable, calibrated leak rate. If the system has multiple evaporators, leakage could be simulated at any of the evaporator locations.
This standard gives detail information on the techniques for measuring R-744 (CO2) and R-1234yf (HFO-1234yf), but the general techniques described here can be used for other refrigerants as well.
Rationale
Content
This standard is being updated to include references to the United States Environmental Protection Agency’s Significant New Alternatives Policy (SNAP) use restrictions with regard to R-744 and R-152a (now supported as a secondary loop application only). The standard was originally developed to provide a consistent method for measuring refrigerant concentrations in a motor vehicle to be used in conjunction with risk assessments that are done for new refrigerants being developed for mobile air conditioning systems. This standard has not been updated for heat pump systems that use an interior condenser for heating. Interior condensers may create a new risk associated with a high-pressure heat exchanger in the cabin interior air flow path. Manufacturers should appropriately consider additional risks associated with using an interior condenser heat exchanger.
Meta TagsDetails
DOI
https://doi.org/10.4271/J2772_201909
Pages
11
Citation
SAE International Technical Standard, Measurement of Passenger Compartment Refrigerant Concentrations Under System Refrigerant Leakage Conditions, SAE Standard J2772_201909, Revised September 2019, Issued February 2011, https://doi.org/10.4271/J2772_201909.
Additional Details
Publisher
Published
Sep 3, 2019
Product Code
J2772_201909
Content Type
Technical Standard
Status
Revised
Language
English

Revisions