En-10
Opening direction
Hexagon wrench
Seal (blank cap
installation portion)
Liquid pipe
Gas pipe
Opening direction
5. 1. 5. How to use adapter (Connection ports of outdoor unit)
• When using the ADAPTER, be careful not to overtighten the nut, or the smaller pipe
may be damaged.
• Apply a coat of refrigeration oil to the threaded connection port of the outdoor unit
where the
fl
are nut comes in.
• Use appropriate wrenches to avoid damaging the connection thread by
overtightening the
fl
are nut.
• Apply wrenches on both of
fl
are nut (local part), and ADAPTER to tighten them.
Adapter tightening torque
Adapter type [in. (mm)]
Tightening torque [lbf·ft. (N·m)]
ø1/2 (ø12.70)
→
ø3/8 (ø9.52)
36.1 to 45.0 (49 to 61)
ø1/2 (ø12.70)
→
ø5/8 (ø15.88)
36.1 to 45.0 (49 to 61)
5. 2. Sealing test
CAUTION
Use only nitrogen gas.
Never use refrigerant gas, oxygen, in
fl
ammable gas or poisonous gas to pressurize
the system. (If oxygen is used, there is the danger of an explosion.)
Do not apply shock during sealing test.
It can rupture the pipes and cause serious injury.
Do not turn on the power unless all operations are complete.
Do not block the walls and the ceiling until the sealing test and the charging of the
refrigerant gas have been completed.
After connecting the pipes, perform an sealing test.
Recheck that the 3-way valve are closed before performing a sealing test.
(Fig. B)
Pour nitrogen gas through both the liquid pipe and the gas pipe.
Pressurize nitrogen gas to 4.2 MPa to perform the sealing test.
Check all
fl
are connection areas and brazed areas.
Then, check that the pressure has not decreased.
Compare the pressures after pressurizing and letting it stand for 24 hours, and check
that the pressure has not decreased.
* When the outdoor temperature changes 5 °C, the test pressure changes 0.05 MPa.
If the pressure has dropped, the pipe joints may be leaking.
If a leakage is found, immediately repair it and perform a sealing test again.
* Decrease the pressure of nitrogen gas before blazing
After completing the sealing test, release the nitrogen gas from both valves.
Release the nitrogen gas slowly.
5. 3. Vacuum process
CAUTION
Do not turn on the power unless all operations are complete.
If the system is not evacuated suf
fi
ciently, its performance will drop.
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.
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.
• If moisture might enter the piping, follow below. (i.e., if doing work during the rainy
season, if the actual work takes long enough that condensation may form on the
inside of the pipes, if rain might enter the pipes during work, etc.)
• After operating the vacuum pump for 2 hours, pressurize to 0.05 MPa (i.e., vacuum
breakdown) with nitrogen gas, then depressurize down to -100.7kPa (-755mmHg)
for an hour using the vacuum pump (vacuum process).
• If the pressure does not reach -100.7kPa (-755mmHg) even after depressurizing
for at least 2 hours, repeat the vacuum breakdown - vacuum process.
After vacuum process, maintain the vacuum for an hour and make sure the pressure
does not rise by monitoring with a vacuum gauge.
Evacuation procedure
(1) Remove the blank caps of the gas pipe and liquid pipe and check that the valves
are closed.
(2) Remove the charging port cap.
(3) Connect a vacuum pump and a pressure gauge to a charging hose and connect it
to the charging port.
(4) Activate the vacuum pump and vacuum the indoor unit and connection piping until
the pressure gauge becomes -100.7kPa (-755mmHg).
Evacuate from both the gas pipe and the liquid pipe.
(5) Continue
evacuating
the
system
for
1 hour after the pressure gauge reads
-100.7kPa (-755mmHg).
(6) Remove
the
charging
hose
and
reinstall the charging port cap.
Table. A
Pipe
3-way valve
Blank cap
Charging port cap
Liquid
valve
7.0 to 9.0 N·m
(70 to 90 kgf·cm)
20.0 to 25.0 N·m
(200 to 250 kgf·cm)
12.5 to 16.0 N·m
(125 to 160 kgf·cm)
Gas
valve
11.0 to 13.0 N·m
(110 to 130 kgf·cm)
30.0 to 35.0 N·m
(300 to 350 kgf·cm)
12.5 to 16.0 N·m
(125 to 160 kgf·cm)
Fig. A Connection system
Outdoor unit
Pressure gauge
Vacuum
pump
Scale
Pressure regulating valve
Nitrogen
Indoor
unit
Indoor
unit
Fig. B
Service hose with valve core
Charging port
Charging port cap
3-way valve
Blank cap
Hexagon wrench
4mm (5/32”)
6. ELECTRICAL WIRING
WARNING
Wiring connections must be performed by a quali
fi
ed person in accordance with speci-
fi
cations.
The rated supply of this product is 60Hz, 208/230V. Use a voltage within the range of
187-253V.
Before connecting the wires, make sure the power supply is OFF.
When installing this system in high humidity locations, install using ground fault equip-
ment breakers (often referred to in other countries as an ELCB [earth leakage current
breaker]) to reduce the risk of leaking current which may result in electric shock or
potential
fi
re.
Be sure to install a breaker of the speci
fi
ed capacity.
When selecting breaker, please comply with the laws and the regulations of each
country.
One breaker must be installed on the power supply of the outdoor unit.
Wrong selection and setup of the breaker will cause electric shock or
fi
re.
Do not connect AC power supply to the transmission line terminal board.
Improper wiring can damage the entire system.
Connect the connector cord securely to the terminal.
Faulty installation can cause a
fi
re.
Make sure to secure the insulation portion of the connector cable with the cord clamp.
A damaged insulation can cause a short circuit.
Never install a power factor improvement condenser. Instead of improving the power
factor, the condenser may overheat.
CAUTION-Risk of Electric Shock
Before servicing the unit, turn the power supply switch OFF. Then, do not touch elec-
tric parts for 10 minutes due to the risk of electric shock.
Make sure to perform grounding work. Improper grounding work can cause electric
shocks.
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