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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
Tools/equipment | Use |
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| How to use tools/equipment | |
Gauge manifold | Vacuuming/charging refrigerant |
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| Prepared newly for R410A only | |
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Charging hose | and operation check |
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| Prepared newly for R410A only | |
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Charging cylinder | Can not be used | Unusable (Use the refrigerant charging measure | |||
instead.) | |||||
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Gas leak detector | Gas leak check |
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| Prepared newly | |
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Vacuum pump | Vacuum drying | Unusable | |||
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Vacuum pump with backflow | Vacuum drying |
|
| R22 (Conventional tools) | |
prevention function |
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Flare tool | Flare machining of pipes |
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| Usable if dimensions are adjusted. | |
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Bender | Bending pipes |
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| R22 (Conventional tools) | |
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Refrigerant recovery equipment | Refrigerant recovery |
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| For R410A only | |
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Torque wrench | Tightening flare nuts |
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| Exclusive for Ø12.7 mm and Ø19.1 mm | |
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Pipe cutter | Cutting pipes |
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| R22 (Conventional tools) | |
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Welding machine and nitrogen | Welding pipes |
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| R22 (Conventional tools) | |
cylinder |
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Refrigerant charging measure | Charging refrigerant |
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| R22 (Conventional tools) | |
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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”.
Digital Inverter
4 INSTALLATION CONDITIONS
Before installation
Be sure to prepare to the following items before installation.
Length of refrigerant pipe
Length of refrigerant pipe |
| |
connected to indoor/ | Item | |
outdoor unit |
| |
7.5 to 30 m | Addition of refrigerant is | |
unnecessary at the local site. | ||
| ||
| If the total length of the | |
| refrigerant pipe exceeds | |
*31 to 70 m | 30 m, add refrigerant in the | |
| amount given in the “Adding | |
| additional refrigerant”. |
*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.
EN | 5 | 6 | EN |
