Fujitsu AOYG18KBTA2 - Additional Charging; Electrical Wiring

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(6) Discharge the nitrogen gas and starting removing the gas with a vacuum pump.
(7) Open the valve of the gauge manifold fully.
(8) Operate the vacuum pump and start pump down.
(9) Check that the compound pressure gauge reads -0.1 MPa (76 cmHg), operate the
vacuum pump for 30 minutes or more in each valve.
(10) At the end of pump down, close the valve of the gauge manifold fully and stop the
vacuum pump.
(11) Disconnect the charge hose from the 3-way valve charging port.
(12) Remove the blank caps, and fully open the spindles of the 2-way and 3-way valves
with a hexagon wrench.
[torque: 6 to 7 N·m (60 to 70 kgf·cm)].
(13) Tighten the blank caps and charging port cap of the 2-way valve and 3-way valve to
the specied torque.
Tightening torque
Blank cap
6.35 mm (1/4 in.) 20 to 25 N·m (200 to 250 kgf·cm)
9.52 mm (3/8 in.) 20 to 25 N·m (200 to 250 kgf·cm)
12.70 mm (1/2 in.) 28 to 32 N·m (280 to 320 kgf·cm)
15.88 mm (5/8 in.) 30 to 35 N·m (300 to 350 kgf·cm)
19.05 mm (3/4 in.) 35 to 40 N·m (350 to 400 kgf·cm)
Charging port cap
10 to 12 N·m (100 to 120 kgf·cm)
Charging port Cap
Outdoor unit
Connecting pipe
Blank cap
Service hose with valve core
Charging port
3-way valve
Hexagon wrench
Use a 4 mm
hexagon wrench
Gauge manifold
LO HI
Vacuum pump
Charge hose
CAUTION
• Do not purge the air with refrigerants, but use a vacuum pump to vacuum the
installation! There is no extra refrigerant in the outdoor unit for air purging!
• Use a vacuum pump and gauge manifold and charging hose for R32 exclusively.
Using the same vacuum for di󰀨erent refrigerants may damage the vacuum pump or
the unit.
3.8. Additional charging
WARNING
• When moving and installing the air conditioner, do not mix gas other than the speci-
ed 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”.
CAUTION
• 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
specied amount will cause a malfunction.
• When charging the refrigerant, take into account the slight change in the composi-
tion 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 lling. (There is an
indication “with siphon for lling liquid” on the steel cylinder.)
Filling method for cylinder with siphon
R32
Gas
Liquid
Set the cylinder vertical and ll with the liquid.
(Liquid can be lled without turning bottom up with the
siphon inside.)
Filling method for other cylinders
R32
Gas
Liquid
Turn bottom up and ll with liquid.
(Be careful to avoid turning over the cylinder.)
• 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 compres-
sor may fail.
• Minimize refrigerant release to the air. Excessive release is prohibited under the
Freon Collection and Destruction Law.
3.9. Electrical wiring
WARNING
• Wiring connections must be performed by a qualied person in accordance with
the specications. 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 o󰀨.
• Never touch electrical components immediately after the power supply has been
turned o󰀨. Electrical shock may occur. After turning o󰀨 the power, always wait
10 minutes or more before touching electrical components.
• Use a dedicated power supply circuit. Insu󰀩cient power capacity in the electrical
circuit or improper wiring may cause electric shock or re.
• Be sure to install an earth leakage breaker.
Otherwise, it will cause electric shock or re.
• 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 re by poor connection, insu󰀩cient insulation, or over current.
• Do not modify power cable, use extension cable or branch wiring. Improper use
may cause electric shock or re by poor connection, insu󰀩cient 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 re.
• Use ring terminals and tighten the terminal screws to the specied 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 re or explosion if gas leaks.
• Connection to a water pipe is not an e󰀨ective 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 re 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.
• Before servicing the unit, turn the power supply switch OFF. Then, do not touch
electric parts for 5 minutes due to the risk of electric shock.
• Make sure to perform grounding work. Improper grounding work can cause electric
shocks.
9319205281-03_IM.indb 10 04-Dec-20 11:51:21