A/C - R12 and R134A O-Ring Color Identification

REF:
HEATING & AIR CONDITIONING

NO:
AC92-004


DATE:
OCTOBER 9, 1992


MODEL:
ALL MODELS



AIR CONDITIONER SYSTEM O-RING COLOR CHANGE

With the change-over to new air conditioning refrigerant R134a (HFC134a), there is a need to distinguish between R12 and R134a O-rings.

Beginning with May, 1992 production, the color of R12 O-rings has been changed from black to brown. The following charts describe O-ring color and material application for both R12 and R134a systems.






NBR: Nitrile Butadiene Rubber
H-NBR: Hydrated Nitrile Butadiene Rubber

NOTE:
Part Numbers remain unchanged.






RBR: Rubber used in HFC134a systems

SERVICE HINT:

There will be a transition period where both black and brown R-12 O-Rings are in distribution. You are advised to use up your current stock as well as additional stock of Black R-12 O-Rings first. This will help prevent confusion when R134a systems are introduced.