AOU45RLXFZ Installation Manual

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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 suffi 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 specifi 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.
Tab le. A
Pipe 3-way valve Blank capCharging 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 qualifi 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 specifi 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.
CAUTION
The primary power supply capacity is for the air conditioner itself, and does not include
the concurrent use of other devices.
Do not use crossover power supply wiring for the outdoor unit.
If the electrical power is inadequate, contact your electric power company.
Install a breaker in a location that is not exposed to high temperatures.
If the temperature surrounding the breaker is too high, the amperage at which the
breaker cuts out may decrease.
We suggest installing ELCB [Earth Leakage Circuit Breaker] or follow local electrical
code.
This system uses an inverter, which means that when used with a ground fault breaker
you must use breakers that can handle harmonics such as a ELCB (30 mA or greater)
in order to prevent malfunctioning of ground fault device.
When the electrical switchboard is installed outdoors, place it under lock and key so
that it is not easily accessible.
Do not fasten the power supply cable and connection cable together.
Always keep to the maximum length of the connection cable. Exceeding the maximum
length may lead to erroneous operation.
The static electricity that is charged to the human body can damage the control PC
Board when handling the control PC Board for address setting, etc.
Please keep caution to the following points.
Provide the grounding of Indoor unit, Outdoor unit and Option equipment.
Cut off the power supply (breaker).
Touch the metal section (such as the unpainted control box section) of the indoor or
outdoor unit for more than 10 seconds. Discharge the static electricity in your body.
Never touch the component terminal or pattern on the PC Board.
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