Sealing Test; Vacuum Process; Tightening Torque; Additional Charging - Fujitsu 07 Installationsanleitung

3.6. Sealing test

• Before operating the compressor, install the pipes and securely connect them.
Otherwise, if the pipes are not installed and if the valves are open when the compressor
operates, air could enter the refrigeration cycle. If this happens, the pressure in the
refrigeration cycle will become abnormally high and cause damage or injury.
• After the installation, make sure there is no refrigerant leakage. If the refrigerant
leaks into the room and becomes exposed to a source of fi re such as a fan heater,
stove, or burner, it produces a toxic gas.
• Do not subject the pipes to strong shocks during the sealing test. It can rupture the
pipes and cause serious injury.
• Do not block the walls and the ceiling until the sealing test and the charging of the
refrigerant gas have been completed.
• For maintenance purposes, do not bury the piping of the outdoor unit.
• After connecting the pipes, perform a sealing test.
• Make sure that the 3-way valves are closed before performing a sealing test.
• Pressurize nitrogen gas to 4.15 MPa to perform the sealing test.
• Add nitrogen gas to both the liquid pipes and the gas pipes.
• Check all fl are connections and welds. 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 air temperature changes 5 °C, the test pressure changes
0.05 MPa. If the pressure has dropped, the pipe joints may be leaking.
• If a leak is found, immediately repair it and perform the sealing test again.
• After completing the sealing test, release the nitrogen gas from both valves.
• Release the nitrogen gas slowly.

3.7. Vacuum process

• 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
aff ect the operation of the unit.
• If the system is not evacuated suffi ciently, its performance will drop.
• Use a clean gauge manifold and charging hose that were designed specifi cally for use
with R32 (R410A). Using the same vacuum equipment for diff erent refrigerants may
damage the vacuum pump or the unit.
• Do not purge the air with refrigerants, but use a vacuum pump to evacuate the sys-
tem.
Refrigerant for purging the air is not charged in the outdoor unit at the factory.
(1) Remove the charging port cap, and connect the gauge manifold and the vacuum
pump to the charging port by the charge hoses.
(2) Vacuum the indoor unit and the connecting piping, confi rm that the pressure gauge
indicates –0.1 MPa [Gauge] (-760 mmHg).
Vacuuming is performed for at least 10 minutes.
(3) When vacuuming is fi nished, close the gauge manifold valve and stop the vacuum
pump.
(4) Leave as it is for one or two minutes. Make sure pointer gauge manifold remains
in the same position. Confi rm that pressure gauge shows -0.1 MPa [Gauge]
(-760 mmHg).
(5) Disconnect the charge hoses and fi t the cap to the charging port to the specifi ed
torque.
(6) Remove the blank caps, and fully open the spindles of the valves on both sides of
gas pipe and liquid pipe with the hexagon. (Open unit it lightly hits the stopper.)
(7) Tighten the blank caps to the specifi ed torque.
6.35 mm (1/4 in.)
9.52 mm (3/8 in.)
Blank cap 12.70 mm (1/2 in.)
15.88 mm (5/8 in.)
19.05 mm (3/8 in.)
Charging port cap
Use a 4 mm hexagon wrench
Flare nuts
2-way valve
(liquid)
3-way valve
(gas)
Charging port
Charging port cap
En-8
9319205960-01_IM_L8.indb 8 9319205960-01_IM_L8.indb 8
WARNING
CAUTION
CAUTION

Tightening torque

20 to 25 N·m (200 to 250 kgf·cm)
20 to 25 N·m (200 to 250 kgf·cm)
28 to 32 N·m (280 to 320 kgf·cm)
30 to 35 N·m (300 to 350 kgf·cm)
35 to 40 N·m (350 to 400 kgf·cm)
12.5 to 16 N·m (125 to 160 kgf·cm)
Gauge manifold
Charge hoses
Vacuum pump
Blank caps

3.8. Additional charging

WARNING
• When moving and installing the air conditioner, do not mix gas other than the
specifi 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
specifi ed amount will cause a malfunction.
• 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
compressor 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 qualifi ed person in accordance with
the specifi 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 off .
• Never touch electrical components immediately after the power supply has been
turned off . Electrical shock may occur. After turning off the power, always wait
10 minutes or more before touching electrical components.
• Use a dedicated power supply circuit. Insuffi cient power capacity in the electrical
circuit or improper wiring may cause electric shock or fi re.
• Be sure to install an earth leakage breaker.
Otherwise, it will cause electric shock or fi 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 fi re by poor connection, insuffi cient insulation, or over current.
• Do not modify power cable, use extension cable or branch wiring. Improper use
may cause electric shock or fi re by poor connection, insuffi 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 fi re.
• Use ring terminals and tighten the terminal screws to the specifi 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 connection 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 fi re or explosion if gas leaks.
- Connection to a water pipe is not an eff 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 fi 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.
2024/1/8 9:29:51 2024/1/8 9:29:51