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Bender
Bending pipes
Refrigerant recovery equipment Refrigerant recovery
Torque wrench
Tightening flare nuts
Pipe cutter
Cutting pipes
Welding machine and nitrogen
Welding pipes
cylinder
Refrigerant charging measure
Charging refrigerant
Refrigerant Piping
New refrigerant (R410A)
When using the conventional piping
• When using the conventional piping with no indication of applicable refrigerant types, be sure to use it with a wall
thickness of 0.8 mm for Ø6.4 mm and Ø12.7 mm. Do not 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 and Ø12.7 mm.
Do not 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 conditioner or those for R410A.
• Before performing flare machining, carefully read "REFRIGERANT PIPING".
EN-13
- 7 -
R22
For R410A only
Exclusive for Ø12.7 mm
R22
R22
R22
4
INSTALLATION CONDITIONS
Before installation
Be sure to prepare to the following items before
installation.
Length of refrigerant pipe
<SP40, SP45>
Length of refrigerant
pipe connected to
Item
indoor/outdoor unit
Addition of refrigerant is
5 to 20 m
unnecessary at the local
site.
<Addition of refrigerant>
Add 20 g of refrigerant for
*21 to 30 m
every 1 m of piping that
exceeds 20 m.
* Caution during addition of refrigerant
When the total length of refrigerant piping exceeds
20 m, add 20 g/m of refrigerant up to a maximum total
length of piping at 30 m. (Max. amount of additional
refrigerant is 200 g.)
Charge the refrigerant accurately. Overcharging may
cause serious trouble with the compressor.
• Do not connect a refrigerant pipe that is shorter than
5 m.
This may cause a malfunction of the compressor or
other devices.
<SP56>
Length of refrigerant
pipe connected to
Item
indoor/outdoor unit
Addition of refrigerant is
5 to 20 m
unnecessary at the local
site.
<Addition of refrigerant>
Add 20 g of refrigerant for
*21 to 50 m
every 1 m of piping that
exceeds 20 m.
* Caution during addition of refrigerant
When the total length of refrigerant piping exceeds
20 m, add 20 g/m of refrigerant up to a maximum total
length of piping at 50 m. (Max. amount of additional
refrigerant is 600 g.)
Charge the refrigerant accurately. Overcharging may
cause serious trouble with the compressor.
• Do not connect a refrigerant pipe that is shorter than
5 m.
This may cause a malfunction of the compressor or
other devices.
Airtight test
1.
Before starting an airtight test, further tighten the
spindle valves on the gas and liquid sides.
2.
Pressurize the pipe with nitrogen gas charged from
the service port to the design pressure (4.15 Mpa) to
conduct an airtight test.
3.
Check for gas leaks using a leak tester for the HFC
refrigerant.
4.
After the airtight test is completed, evacuate the
nitrogen gas.
Air purge
• To purge air, use a vacuum pump.
• Do not use refrigerant charged in the outdoor unit to
purge air. (The air purge refrigerant is not contained in
the outdoor unit.)
Electrical wiring
• Be sure to fix the power wires and indoor/outdoor
connecting wires with clamps so that they do not come
into contact with the cabinet, etc.
EN-14
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