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Bender
Bending pipes
Refrigerant recovery equipment
Refrigerant recovery
Torque wrench
Tightening flare nuts
Pipe cutter
Cutting pipes
Refrigerant cylinder
Charging refrigerant
Welding machine and nitrogen
Welding pipes
cylinder
Electronic refrigerant charging
Charging refrigerant
scale
Refrigerant piping
R32 refrigerant
CAUTION
Incomplete flaring may cause refrigerant gas leakage.
Do not re-use flares. Use new flares to prevent refrigerant gas leakage.
Use flare nuts that are included with the unit. Using different flare nuts may cause refrigerant gas leakage.
Use the following item for the refrigerant piping.
Material : Seamless phosphorous deoxidized copper pipe.
Ø6.35, Ø9.52, Ø12.7 Wall thickness 0.8 mm or more
Ø15.88 Wall thickness 1.0 mm or more
REQUIREMENT
When the refrigerant pipe is long, provide support brackets at intervals of 2.5 to 3 m to clamp the refrigerant pipe.
Otherwise, abnormal sound may be generated.
19-EN
Conventional tools (R410A)
Conventional tools (R32 or R410A)
Conventional tools (R410A)
Conventional tools (R410A)
Prepared newly (Use for R32 only)
Conventional tools (R410A)
Conventional tools (R32 or R410A)
– 10 –
4
Installation conditions
Before installation
Be sure to prepare to the following items before
installation.
Length of refrigerant pipe
<GM56>
Length of refrigerant
Model
pipe connected to
Item
indoor / outdoor unit
Addition of refrigerant
at the local site in
unnecessary for
refrigerant pipe length
up to 20 m.
GM56
5 to 30 m
If the refrigerant pipe
length exceeds 20 m.
Add refrigerant in
the amount given in
"Charging additional
refrigerant"
* Caution during addition of refrigerant.
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 system
interconnection 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
20-EN
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