Hose/Line HVAC: Description and Operation

Refrigerant System (R-134a), Components

Hoses and Lines
The mixture of refrigerant oil (PAG oil) and refrigerant R-134a attacks some metals and alloys (for example, copper) and breaks down certain hose material. Use only hoses and lines which are identified with the lettering "R-134a".

Hoses and lines are secured with threaded connections. Always properly torque hose and line connections.