En-7
5.5. Vacuum process
CAUTION
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 suf
fi
ciently, its performance will drop.
Use a clean gauge manifold and charging hose that were designed speci
fi
cally for use
with 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 system.
(1) Check that the valves are closed by removing the blank caps from the gas and
liquid pipes.
(2) Remove the charging port cap, and connect the gauge manifold and the vacuum
pump to the charging valve with the service hoses.
(3) Vacuum the indoor unit and the connecting pipes until the pressure gauge indicates
–0.1 MPa (–76 cmHg).
(4) When –0.1 MPa (–76 cmHg) is reached, operate the vacuum pump for at least
60 minutes.
(5) Disconnect the service hoses and
fi
t the charging port cap to the charging valve to
the speci
fi
ed torque. (Refer to below table)
(6) Remove the blank caps, and fully open the 3-way valves with a hexagon wrench
[Torque: 6 to 7 N·m (60 to 70 kgf·cm)].
(7) Tighten the blank caps of the 3-way valve to the speci
fi
ed torque. (Refer to Table A
on page 6.)
Tightening torque [N·m (kgf·cm)]
Charging port cap
10 to 12 (100 to 120)
Service hose
Service hose with valve core
Charging port
Blank cap
Hexagon wrench
Connecting pipe
Gauge manifold
Vacuum pump
Charging port cap
3-way valve
Use a 4 mm
hexagon
wrench
Pressure regulating valve
Pressure gauge
Nitrogen
Indoor unit
Outdoor unit
Vacuum pump
5.6. Additional charging
WARNING
When moving and installing the air conditioner, do not mix gas other than the speci
fi
ed
refrigerant R410A 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.
CAUTION
After vacuuming the system, add refrigerant.
Do not reuse recovered refrigerant.
When charging the refrigerant R410A, always use an electronic scales for refrigerant
charging (to measure the refrigerant by weight). Adding more refrigerant than the
speci
fi
ed amount will cause a malfunction.
CAUTION
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. Adding refrigerant through the gas pipe will cause a malfunction.
Check if the steel cylinder has a siphon installed or not before
fi
lling. (There is an
indication “with siphon for
fi
lling liquid” on the steel cylinder.)
Filling method for cylinder with siphon
R410A
Gas
Liquid
Set the cylinder vertical and
fi
ll with the liquid.
(Liquid can be
fi
lled without turning bottom up with the
siphon inside.)
Filling method for other cylinders
R410A
Gas
Liquid
Turn bottom up and
fi
ll with liquid.
(Be careful to avoid turning over the cylinder.)
Be sure to use the special tools for 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.
5.6.1. For Pre-charge lengths
Refrigerant pipe size
Piping length (L) *Pre-charge [m]
Standard
30
Size up (Liquid pipe)
15
5.6.2. If additional refrigerant is required
When the piping is longer than pre-charge length, additional charging is necessary.
•
For the additional amount, see the table below.
•
Additional charging amount
Single type
L1 (*1) > Pre-charge length
Refrigerant pipe size
[mm (in.)]
Piping length
Standard
~30 m
40 m
50 m
60 m
70 m
g/m
Liquid
9.52 (3/8)
None
500 g
1,000 g 1,500 g 2,000 g
50 g/m
Gas
15.88 (5/8)
Size up
~30 m
40 m
50 m
g/m
Liquid
9.52 (3/8)
None
500 g
1,000 g
50 g/m
Gas
19.05 (3/4)
~15 m
25 m
35 m
g/m
Liquid
12.70 (1/2)
None
1,000 g 2,000 g
100 g/m
Gas
15.88 (5/8)
19.05 (3/4)
*1: Refer to “View” in the table of “4.3. Refrigerant pipe size and allowable piping length”.
s
d
6. ELECTRICAL WIRING
6.1. Notes for electrical wiring
WARNING
Wiring connections must be performed by a quali
fi
ed person in accordance with
the speci
fi
cations. The voltage rating for this product is 400 V at 50 Hz. It should be
operated within the range of 342 to 456 V.
Before connecting the wires, make sure the power supply is OFF.
Use a dedicated power supply circuit. Insuf
fi
cient power capacity in the electrical circuit
or improper wiring may cause electric shock or
fi
re.
Install a breaker at the power supply for each outdoor unit. Improper breaker selection
can cause electric shock or
fi
re.
Install a leakage circuit breaker in accordance with the related laws and regulations. An
improperly installed electrical box cover can cause serious accidents such as electric
shock or
fi
re through exposure to dust or water.
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
fi
re
by poor connection, insuf
fi
cient insulation, or over current.
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