Haier AB122ACERA Service Manual - Page 6

Commercial Air Conditioner Model: AU122AEERA AB122ACERA AC122ACERA AD122ALERA ■Piping material 1. Use the correct refrigerant piping and materials for R410A 2. For the pipe wall thickness, see the table below: Pipe diameter Φ6.35 Φ9.52 Φ12.7 Φ15.88 Φ19.1 Pipe wall thickness 0.8 0.8 0.8 1.0 1.2 Note: Always observe and comply with the local regulations when installing the refrigerant piping. ■Tools R410A work requires a number of special tools (* symbol). Since the tools used in R22 work cannot be used for R410A, provide the tools separately. Tool name Process and application Pipe cutter Piping cutting Refrigerant piping work *Flaring tool Pipe flaring work *Torque wrench Flare nut connection Expander Expansion at pipe connection Pipe bender Pipe bending work Nitrogen gas Pipe oxidation prevention Air tightness test Welder Pipe brazing *Gauge manifold Vacuum evacuation and refrigerant Air tightness test *Charging hose charging operation check Refrigerant additional charging *Vacuum pump (with Vacuum drying adapter) Electronic scale Refrigerant additional Gas leakage detector Gas leakage test ■Work precautions charging Refrigerant check: Before work, check the used refrigerant and prepare materials matched to the refrigerant. Refrigerant piping: Observe the basics of refrigerant piping to avoid the unnecessary problems. In addition, when performing the welding work, seal in the nitrogen gas to the pipes, and prevent it from the oxidation. Leak pressure detection: Perform seal detection and make sure there is no refrigerant leakage. Vacuum drying: If the vacuum pump has not the reverse flow check mechanism, use the pump together with a reverse flow check adapter. Additional refrigerant: Charge a suitable amount of refrigerant with a special R410A gauge manifold and charging hose. 6