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3.7. Vacuum process
• Perform a refrigerant leakage test (air tightness test) to check for leaks using nitrogen
gas while all valves in the outdoor unit are closed. (Use the test pressure indicated
on the nameplate.)
• Be sure to evacuate the refrigerant system using a vacuum pump.
• The refrigerant pressure may sometimes not rise when a closed valve is opened after
the system is evacuated using a vacuum pump. This is caused by the closure of the
refrigerant system of the outdoor unit by the electronic expansion valve. This will not
affect the operation of the unit.
• If the system is not evacuated sufficiently, its performance will drop.
• Use a clean gauge manifold and charging hose that were designed specifically for use
with R32(R410A). Using the same vacuum equipment for different refrigerants may
damage the vacuum pump or the unit.
• Do not purge the air with refrigerants, but use a vacuum pump to evacuate the sys-
tem.
Refrigerant for purging the air is not charged in the outdoor unit at the factory.
(1) Remove the cap, and connect the gauge manifold and the vacuum pump to the
charging valve by the service hoses.
(2) Vacuum the indoor unit and the connecting pipes until the pressure gauge indicates
–0.1 MPa (–76 cmHg).
(3) When –0.1 MPa (–76 cmHg) is reached, operate the vacuum pump for at least
60 minutes.
(4) Disconnect the service hoses and fit the cap to the charging valve to the specified
torque.
(5) Remove the blank caps, and fully open the spindles of the 3-way valves with a
hexagon wrench [Torque: 6~7 N·m (60 to 70 kgf·cm)].
(6) Tighten the blank caps of the 3-way valves to the specified torque.
6.35 mm (1/4 in.)
9.52 mm (3/8 in.)
Blank cap
12.70 mm (1/2 in.)
15.88 mm (5/8 in.)
19.05 mm (3/8 in.)
Charging port cap
Use a 4 mm hexigon wrench
Flare nuts
Service valve
(Liquid)
Service valve
(Gas)
Charging port
Charging port cap
3.8. Additional charging
• When moving and installing the air conditioner, do not mix gas other than the
specified refrigerant R32 inside the refrigerant cycle.
If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise
to an abnormally high value and cause breakage, injury, etc.
Charge the refrigerant following the instruction in "2.5. Additional charge amount".
En-8
CAUTION
Tightening torque
20 to 25 N·m (200 to 250 kgf·cm)
20 to 25 N·m (200 to 250 kgf·cm)
28 to 32 N·m (280 to 320 kgf·cm)
30 to 35 N·m (300 to 350 kgf·cm)
35 to 40 N·m (350 to 400 kgf·cm)
12.5 to 16 N·m (125 to 160 kgf·cm)
Gauge manifold
Blank caps
Vacuum pump
WARNING
• After vacuuming the system, add refrigerant.
• Do not reuse recovered refrigerant.
• When charging the refrigerant R32, always use an electronic scales for refrigerant
charging (to measure the refrigerant by weight). Adding more refrigerant than the
specified amount will cause a malfunction.
• When charging the refrigerant, take into account the slight change in the
composition of the gas and liquid phases, and always charge from the liquid phase
side whose composition is stable.
• Check if the steel cylinder has a siphon installed or not before filling. (There is an
indication "with siphon for filling liquid" on the steel cylinder.)
Filling method for cylinder with siphon
R32
Gas
Set the cylinder vertical and fill with the liquid.
(Liquid can be filled without turning bottom up with the
siphon inside.)
Liquid
Filling method for other cylinders
R32
Gas
Turn bottom up and fill with liquid.
(Be careful to avoid turning over the cylinder.)
Liquid
• Be sure to use the special tools for R32(R410A) for pressure resistance and to
avoid mixing of impure substances.
• If the units are further apart than the maximum pipe length, correct operation can
not be guaranteed.
• Make sure to back closing valve after refrigerant charging. Otherwise, the
compressor may fail.
• Minimize refrigerant release to the air. Excessive release is prohibited under the
Freon Collection and Destruction Law.
3.9. Electrical wiring
• Wiring connections must be performed by a qualified person in accordance with
the specifications. The voltage rating for this product is 230 V at 50 Hz. It should be
operated within the range of 198 to 264 V.
• Before connecting the wires, make sure the power supply is off.
• Never touch electrical components immediately after the power supply has been
turned off. Electrical shock may occur. After turning off the power, always wait
10 minutes or more before touching electrical components.
• Use a dedicated power supply circuit. Insufficient power capacity in the electrical
circuit or improper wiring may cause electric shock or fire.
• Be sure to install an earth leakage breaker.
Otherwise, it will cause electric shock or fire.
• A circuit breaker is installed in the permanent wiring. Always use a circuit that can
trip all the poles of the wiring and has an isolation distance of at least 3 mm between
the contacts of each pole.
• Use designated cables and power cables. Improper use may cause electric shock
or fire by poor connection, insufficient insulation, or over current.
• Do not modify power cable, use extension cable or branch wiring. Improper use
may cause electric shock or fire by poor connection, insufficient insulation or over
current.
• Connect the connector cable securely to the terminal. Check no mechanical force
bears on the cables connected to the terminals. Faulty installation can cause a fire.
• Use ring terminals and tighten the terminal screws to the specified torques, other-
wise, abnormal overheating may be produced and possibly cause serious damage
inside the unit.
• Make sure to secure the insulation portion of the connector cable with the cable
clamp. Damaged insulation can cause a short circuit.
• Fix cables so that cables do not make contact with the pipes (especially on high
pressure side). Do not make power supply cable and transmission cable come in
contact with valves (Gas).
• Never install a power factor improvement condenser. Instead of improving the power
factor, the condenser may overheat.
• Be sure to perform the grounding work.
Do not connect grounding wires to a gas pipe, water pipe, lightning rod or grounding
wire for a telephone.
• Connection to a gas pipe may cause a fire or explosion if gas leaks.
• Connection to a water pipe is not an effective grounding method if PVC pipe is used.
• Connection to the grounding wire of a telephone or to a lightning rod may cause a
dangerously abnormal rise in the electrical potential if lightning strikes.
• Improper grounding work can cause electric shocks.
• Securely install the electrical box cover on the unit. An improperly installed service
panel can cause serious accidents such as electric shock or fire through exposure
to dust or water.
• Do not connect the AC power supply to the transmission line terminal board. Im-
proper wiring can damage the entire system.
CAUTION
WARNING
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