Coupler HVAC: Description and Operation

A new type refrigerant connection has been introduced to all refrigerant lines except the following location:
- Expansion valve to cooling unit.




FEATURES OF NEW TYPE REFRIGERANT CONNECTION
- The O-ring is relocated in a groove for proper installation. This eliminates the chance of the O-ring being caught in, or damaged by, the mating part. The sealing direction of the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing characteristics.
- The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facilitating piping connections.




O-RING AND REFRIGERANT CONNECTION


CAUTION: Refrigerant connections in some Systems use different O-ring configurations. Do not confuse O-rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at, or around, the connection.







O-ring part numbers and specifications


WARNING: Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.


CAUTION: When replacing or cleaning refrigerant cycle components, observe the following.
- Do not leave compressor on its side or upside down for more than 10 minutes. Compressor lubricant will enter low pressure chamber.
- When connecting tubes, always use a torque wrench and a back-up wrench.
- After disconnecting tubes, plug all openings immediately to prevent entry of dirt and moisture.
- When installing an air conditioner unit in the vehicle, connect the pipes as the final stage of the operation. Do not remove seal caps from pipes and other components until just before connection.
- Allow components stored in cool areas to warm to working area temperature before removing seal caps. This prevents condensation from forming inside A/c components.
- Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
- Always replace used O-rings.
- When connecting tube, apply lubricant to portions shown in illustration. Be careful not to apply lubricant to threaded portion.
Name: Nissan A/C System Lubricant Type R
Part NO.*: KLHOO-PAGRO
- O-ring must be closely attached to inflated portion of tube.
- After inserting tube into union until O-ring is no longer visible, tighten nut to specified torque.
- After connecting line, conduct leak test and make sure that there is no leakage. When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten connections of seal seat to the specified torque.




Always check with the Parts Department for the latest parts information.