En-9
6. ELECTRICAL WIRING
6.1. Notes for electrical wiring
WARNING
Wiring connections must be performed by a qualified person in accordance with the
specifications. The voltage rating for this product is 220-240 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.
Use a dedicated power supply circuit. Insufficient power capacity in the electrical circuit
or improper wiring may cause electric shock or fire.
Install a breaker at the power supply for each outdoor unit. Improper breaker selection
can cause electric shock or fire.
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 fire 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 2/16 in. (3mm) 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 crimp-type terminals and tighten the terminal screws to the specified torques,
otherwise, 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 earthing (grounding) work.
Do not connect earthing (grounding) wires to a gas pipe, water pipe, lightning rod or
earthing (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 earthing (grounding) method if PVC
pipe is used.
•
Connection to the earthing (grounding) wire of a telephone or to a lightning rod may
cause a dangerously abnormal rise in the electrical potential if lightning strikes.
Improper earthing (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.
CAUTION
The primary power supply capacity is for the air conditioner itself, and does not include
the concurrent use of other devices.
Do not start operation until the refrigerant is charged completely. The compressor will
fail if it is operated before the refrigerant piping charging is complete.
Transmission cable between indoor unit and outdoor unit is 240 V.
Be sure not to remove thermistor sensor etc. from power wiring and connection wiring.
Compressor may fail if operated while removed.
Start wiring work after closing branch switch and over current breaker.
Use an earth leakage breaker that is capable of handling high frequencies. Because the
outdoor unit is inverter controlled, a high-frequency earth leakage breaker is necessary
to prevent a malfunction of the breaker itself.
When using an earth leakage breaker that has been designed solely for earth (ground)
fault protection, be sure to install a fuse-equipped switch or circuit breaker.
Do not connect the AC power supply to the transmission line terminal board. Improper
wiring can damage the entire system.
Do not use crossover power supply wiring for the outdoor unit.
If the temperature surrounding the breaker is too high, the amperage at which the
breaker cuts out may decrease.
Tightening torque [N·m (lbs·ft)]
Charging port cap
10 to 12 (7 to 9)
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
5.6. Additional charging
WARNING
When moving and installing the air conditioner, do not mix gas other than the specified
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
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. Adding refrigerant through the gas pipe will cause a malfunction.
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
R410A
Gas
Liquid
Set the cylinder vertical and fill with the liquid.
(Liquid can be filled without turning bottom up with the
siphon inside.)
Filling method for other cylinders
R410A
Gas
Liquid
Turn bottom up and fill 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.
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