Unit Wiring; Connection Diagrams; Outdoor Unit; Pipe Installation I I - Fujitsu AOYG18LAC2 Installationsanleitung

5. 3.

Unit wiring

• When stripping off the coating of a lead wire, always use a special tool such as a wire
stripper. If there is no special tool available, carefully strip the coating with a knife etc.
20 mm
Earth (Ground) wire
How to connect wiring to the terminal
Caution when wiring cable
(1) Use crimp-type terminals with insulating sleeves as shown in the fi gure to
connect to the terminal block.
(2) Securely clamp the crimp-type terminals to the wires using an appropriate tool
so that the wires do not come loose.
(3) Use the specifi ed wires, connect them securely, and fasten them so that there is
no stress placed on the terminals.
(4) Use an appropriate screwdriver to tighten the terminal screws. Do not use a
screwdriver that is too small, otherwise, the screw heads may be damaged and
prevent the screws from being properly tightened.
(5) Do not tighten the terminal screws too much, otherwise, the screws may break.
(6) See the table below for the terminal screw tightening torques.
Strip : 10mm
Screw with special washer
Crimp-type terminal
Wire
Terminal blocks
Tightening torque [N·m (kgf·cm)]
M4 screw
5. 4.

Connection diagrams

Power cable
230V
50 Hz · 1ø
L
POWER
N
Earth (Ground)
5. 5.

Outdoor unit

(1) Switch cover removal
• Remove the 6 fi xing
screws.
• Lift the switch cover B
upward, and then pull it
outward to remove it.
• Pull the switch cover A
outward to remove it.
(2) Connect the power
supply cable and the
connection cable to
terminal.
Fasten the power
supply cable and
connection cable with
cable clamp.
PVC tube
Cable clamp
En-7
Power cable or
Connection cable
60 mm or more
Crimp-type
terminal
Sleeve
Screw with
special washer
Crimp-type
terminal
Wire
1.2 to 1.8 (12 to 18)
Connection cable
1
1
2 2
B
3 3
Connection cable
1 1
2
A 2
3
3
Switch cover A
Hook
Switch cover B
Hook
POWER
UNIT A UNIT B
L N
1 2 3 1 2 3
Power cable
Connection cable
(3) As illustrated below,
draw out the power
cable and the
connection cable.
(4) Install the switch cover
A, B.
6. PIPE INSTALLATION II
6. 1.

Vacuum

Always use a vacuum pump to purge the air.
Refrigerant for purging the air is not charged in the outdoor unit at the factory.
Refrigerant must not be discharged into atmosphere.
Use a vacuum pump, gauge manifold and charge hose for R410A exclusively. Using
the same vacuum for different refrigerants may damage the vacuum pump or the unit.
B
After connecting the piping, check the joints for gas leakage with gas leak detector or
soapy water.
6. 1. 1. CHECKING GAS LEAKAGE AND PURGING AIR
A
Gas leak checks are performed using either vacuum or nitrogen gas, so select the proper
one depending on the situation.
Checking gas leaks with vacuum:
(1) Check if the piping connections are secure.
(2) Remove the cap of 3-way valve, and connect the gauge manifold charge hoses to the
charging port of the 3-way valve.
(3) Open the valve of the gauge manifold fully.
(4) Operate the vacuum pump and start pump down.
(5) Check that the compound pressure gauge reads -0.1 MPa (76 cmHg), operate the
vacuum pump for 30 minutes or more in each valve.
(6) At the end of pump down, close the valve of the gauge manifold fully and stop the
vacuum pump.
(It checks that leave as it is for about 10 minutes, and a needle does not return.)
(7) Disconnect the charge hose from the 3-way valve charging port.
(8) 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)].
(9) Tighten the blank caps and charging port cap of the 2-way valve and 3-way valve to
the specifi ed torque.
Checking gas leaks with nitrogen gas:
(1) Check if the piping connections are secure.
(2) Remove the cap of 3-way valve, and connect the gauge manifold charge hoses to the
charging port of the 3-way valve.
(3) Pressurize with nitrogen gas using the 3-way valve charging port.
(4) Do not pressurize up to the specifi ed pressure all at once but do so gradually.
① Increase the pressure up to 0.5 Mpa (5 kgf/cm
and then check for any decrease in pressure.
② Increase the pressure up to 1.5 Mpa (15 kgf/cm
and then check for any decrease in pressure.
③ Increase the pressure up to the specifi ed pressure (the pressure designed for the
product) and then make a note of it.
(5) Let it sit at the specifi ed pressure and if there is no decrease in pressure then it is
PVC tube
satisfactory. If a pressure decrease is confi rmed, there is a leak, so it is necessary to
specify the leak location and make minor adjustments.
(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.
Power cable
Connection cable
Switch cover A
Switch cover B
CAUTION
2
), let it sit for about fi ve minutes
2
), let it sit for about fi ve minutes