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3
Installation of R410A refrigerant air
conditioner
CAUTION
New refrigerant air conditioner installation
•
This air conditioner adopts the new HFC refrigerant (R410A) which does not destroy ozone layer.
R410A refrigerant is apt to be affected by impurities such as water, oxidizing membrane, and oils because the
working pressure of R410A refrigerant is approx. 1.6 times as that of refrigerant R22. Accompanied with the
adoption of the new refrigerant, the refrigerant oil has also been changed. Therefore, during installation work,
be sure that water, dust, former refrigerant, or refrigerant oil does not enter the new type refrigerant R410A air
conditioner cycle.
To prevent mixing of refrigerant or refrigerant oil, the sizes of connecting sections of charging port on main unit
and installation tools are different from those of the conventional refrigerant units. Accordingly, special tools are
required for the new refrigerant (R410A) units. For connecting pipes, use new and clean piping materials with
high pressure fittings made for R410A only, so that water and/or dust does not enter.
Required tools / Equipment and precautions for use
■
Prepare the tools and equipment listed in the following table before starting the installation work.
: R410A exclusive
: Generic
Tools/equipment
Manifold gauge*
Vacuuming/charging refrigerant
and operation check
Charging hose
Gas leak detector
Gas leak check
Vacuum pump with backflow
Vacuum drying
prevention function
Flare tool
Flare machining of pipes
Bender
Bending pipes
Refrigerant recovery equipment
Refrigerant recovery
Torque wrench
Tightening flare nuts
Pipe cutter
Cutting pipes
Brazing torch and nitrogen
Braze pipes
cylinder
Refrigerant charging scales
Charging refrigerant
4 mm hexagon wrench
Opening liquid valve
11-EN
1131601101 EN FR ES.indb 6
1131601101 EN FR ES.indb 6
Use
Usable if dimensions are adjusted.
Ø1/2" (12.7 mm) and Ø5/8" (15.9 mm)
4
Installation conditions
Before installation
■
Be sure to prepare to the following items before
installation.
Length of refrigerant pipe
Length of
refrigerant
pipe
Model
Item
connected
to indoor /
outdoor unit
Addition of refrigerant
at the local site in
unnecessary for
refrigerant pipe lengths
up to 98'5" (30 m).
16'5" to 164'1"
If the reftigerant pipe
RAV-SP242AT2P-UL
(5 to 50 m)
length exceeds 98'5"
(30 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
16'5" (5 m).
This may cause a malfunction of the compressor or
other devices.
Leakage test
1. Before starting a leakage 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 a leakage test.
3. After the leakage test is completed, evacuate the
nitrogen gas.
Evacuation
•
To evacuate system, use a vacuum pump.
•
Do not use refrigerant charged in the outdoor unit
for evacuation.
– 6 –
Electrical wiring
•
Be sure to fi x the power wires and system
interconnection wires with clamps so that they do
not come into contact with the cabinet, etc.
Grounding
WARNING
Make sure that proper grounding is provided.
Improper grounding may cause an electric shock.
For details on how to check grounding, contact
the dealer who installed the air conditioner or a
professional installation company.
•
Proper grounding 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.
4/8/2565 BE 10:14
4/8/2565 BE 10:14
EN
TH
ID
12-EN
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