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EN 5
Digital Inverter
Required Tools/Equipment and Precautions for Use
Prepare the tools and equipment listed in the following table before starting the 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
• 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, Ø9.5 mm, and Ø12.7 mm, with a wall thickness of 1.0 mm for Ø15.9 mm, with a wall thickness of
1.2 mm for Ø19.1 mm, and with a wall thickness of 1.0 mm for Ø28.6 mm (half hard). Do not use the conventional piping 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, with a wall thickness of
1.0 mm for Ø15.9 mm, with a wall thickness of 1.2 mm for Ø19.1 mm, and with a wall thickness of 1.0 mm for Ø28.6 mm
(half hard).
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”.
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 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 Ø19.1 mm
Pipe cutter Cutting pipes
R22 (Conventional tools)
Welding machine and nitrogen
cylinder
Welding pipes
R22 (Conventional tools)
Refrigerant charging measure Charging refrigerant
R22 (Conventional tools)
6 EN
Digital Inverter
4
INSTALLATION CONDITIONS
Before installation
Be sure to prepare to the following items before installation.
Length of refrigerant pipe
* Do not connect a refrigerant pipe that is shorter than
7.5 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. 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.
Earthing
WARNING
Make sure that proper earthing is provided.
Improper earthing may cause an electric shock. For details
on how to check earthing, contact the dealer who installed
the air conditioner or a professional installation company.
• Proper earthing can prevent charging of electricity on the
outdoor unit surface due to the presence of a high
frequency in the frequency converter (inverter) of the
outdoor unit, as well as prevent electric shock. If the
outdoor unit is not properly earthed, you may be exposed
to an electric shock.
• Be sure to connect the earth wire (grounding work).
Incomplete grounding can cause an electric shock.
Do not connect ground wires to gas pipes, water pipes,
lightning rods or ground wires for telephone wires.
Test Run
Turn on the leakage breaker at least 12 hours before starting
a test run to protect the compressor during startup.
CAUTION
Incorrect installation work may result in a malfunction or
complaints from customers.
Length of refrigerant pipe
connected to indoor/
outdoor unit
Item
7.5 to 30 m
Addition of refrigerant is
unnecessary at the local site.
*31 to 70 m
If the total length of the
refrigerant pipe exceeds
30 m, add refrigerant in the
amount given in the “Adding
additional refrigerant”.