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8. OUTDOOR UNIT INSTALLATION MANUAL
Engineering Data book
Required Tools/Equipment and Precautions for Use
Prepare the tools and equipment listed in the following table before starting installation work.
Newly prepared tools and equipment must be used exclusively.
Legend
: Prepared newly (Use for R410A only. Do not use for refrigerant R22 or R407C etc..)
: Conventional tools/equipment are available
Refrigerant Piping
New refrigerant (R410A)
When using the conventional piping kit
• When using the conventional piping kit that has no indication of applicable refrigerant types, be sure to use it with
a wall thickness of 0.8 mm for Ø6.4 mm, Ø9.5 mm, and Ø12.7 mm, and with a wall thickness of 1.0 mm for Ø15.9
mm. Never use the conventional piping kit with a wall thickness less than these thicknesses due to insufficient
pressure capacity.
When using general copper pipes
• Use general copper pipes with a wall thickness of 0.8 mm for Ø6.4 mm, Ø9.5 mm, and Ø12.7 mm, and with a
wall thickness of 1.0 mm for Ø15.9 mm.
Never use any copper pipes with a wall thickness less than these thicknesses.
Flare nuts and flare machining
• The flare nuts and flare machining are different from those for the conventional refrigerant.
Use the flare nuts supplied with the Air to Water Heat Pump or those for R410A.
• Before performing flare machining, carefully read “REFRIGERANT PIPING”
Tools/equipment Use How to use tools/equipment
Gauge manifold Vacuuming/charging
refrigerant and operation
check
Prepared newly for R410A only
Charging hose Prepared newly for R410A only
Charging cylinder Can not be used Unusable (Use the refrigerant charging measure instead.)
Gas leak detector Gas leak check Prepared newly
Vacuum pump with backflow
prevention function
Vacuum drying Unusable
Vacuum pump with backflow
prevention function
Vacuum drying R22 (Conventional tools)
Flare tool Flare machining of pipes Usable if dimensions are adjusted.
Bender Bending pipes R22 (Conventional tools)
Refrigerant recovery equipment Refrigerant recovery For R410A only
Torque wrench Tightening flare nuts Exclusive for Ø12.7 mm and Ø15.9 mm
Pipe cutter Cutting pipes R22 (Conventional tools)
Refrigerant cylinder Charging refrigerant
For R410A only
Discriminated by the refrigerant name on the cylinder.
Welding machine and nitrogen
cylinder
Welding pipes R22 (Conventional tools)
Refrigerant charging measure Charging refrigerant R22 (Conventional tools)
5-EN
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