Haier AU182AFERA - Page 6

Commercial Air Conditioner Model: AU182AFERA
AD182AMERA, AS182AVERA
■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
*Flaring tool Pipe flaring work
*Torque wrench Flare nut connection
Expander Expansion at pipe connection
Pipe bender Pipe bending work
Refrigerant piping work
Nitrogen gas Pipe oxidation prevention
Welder Pipe brazing
Air tightness test
*Gauge manifold
*Charging hose
Vacuum evacuation and refrigerant
charging operation check
Air tightness test
Refrigerant additional
charging
*Vacuum pump (with
adapter)
Vacuum drying
Electronic scale
Gas leakage detector Gas leakage test
Refrigerant additional
charging
■Work precautions
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.
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