Coupler HVAC: Description and Operation
REFRIGERANT LINE COUPLERDESCRIPTION
Spring-lock type refrigerant line couplers are used to connect the A/C liquid line to the A/C evaporator and, on RHD models the front section of the liquid line to the rear section of the liquid line. Secondary retaining clips are installed over the connected couplers for added protection.
The spring-lock refrigerant line couplers require special disconnect tools for disengaging the two coupler halves.
OPERATION
Spring-Lock Coupler - Typical:
The spring-lock coupler is held together by a garter spring inside a circular cage on the male half of the fitting. When the two coupler halves are connected, the flared end of the female fitting slips behind the garter spring inside the cage on the male fitting. The garter spring and cage prevent the flared end of the female fitting from pulling out of the cage.
Two O-rings on the male half of the fitting are used to seal the connection. These O-rings are compatible with R-134a refrigerant and must be replaced with O-rings made of the same material.
Secondary clips are installed over the two connected coupler halves at the factory for added blowoff protection. In addition, some models have a plastic ring that is used at the factory as a visual indicator to confirm that these couplers are connected. After the coupler is connected, the plastic indicator ring is no longer needed; however, it will remain on the refrigerant line near the coupler cage.