Electrical Wiring - Fujitsu AGHG12KVCA Installation Manual

When the flare nut is tightened properly by your hand, hold the body side coupling with
a wrench, then tighten with a torque wrench. (Refer to the following table for the flare nut
tightening torques.)
Tighten with two wrenches.
Wrench (fixed)
Torque wrench
Flare nut [mm (in.)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
15.88 (5/8) dia.
19.05 (3/4) dia.
Do not remove the cap from the connection pipe before connecting the pipe.

3.4. Electrical wiring

• Before connecting the wires, make sure the power supply is OFF.
• Every wire must be connected firmly.
• No wire should be allowed to touch refrigerant tubing, the compressor, or any mov-
ing part.
• Loose wiring may cause the terminal to overheat or result in unit malfunction. A fire
hazard may also exist. Therefore, be sure all wiring is tightly connected.
• Connect wires to the matching numbers of terminals.
Be careful not to generate a spark as follows for using a flammable refrigerant.
• Do not remove the fuse while the power is on.
• Do not disconnect the wiring while the power is on.
• It is recommended to position the outlet connection in a high position. Place the
cords so that they do not get tangled.
3.4.1. Wiring system diagram
■ Standard pair
Connection cable
Indoor unit
Ground (Earth) line
Power line
■ Wired remote controller cable (option)
2-wire type
■ Multi-split type
Connection cable
Indoor unit
Ground (Earth) line
Power line
Control line
Indoor unit
En-8
Indoor unit pipe
Flare nut
Connection pipe
Tightening torque [N·m (kgf·cm)]
16 to 18 (160 to 180)
32 to 42 (320 to 420)
49 to 61 (490 to 610)
63 to 75 (630 to 750)
90 to 110 (900 to 1,100)
WARNING
CAUTION
Outdoor unit
Control line
Outdoor unit
3.4.2. Indoor unit wiring
(1) Remove the terminal cover.
(2) Remove the cable clamp.
(3) Bend the end of the connection cable as shown in the figure.
(4) Connect the end of the connection cable fully into the terminal block.
(5) Fasten the connection cable with a cable clamp.
Screw
Terminal cover Cable clamp
Ground (Earth)
wire Unit: mm
3.4.3. How to connect wiring to the terminals
■ Caution when wiring cable
To strip off the insulation of a lead wire, always use a special tool such as a wire stripper.
If there is no special tool, carefully strip off the insulation by using a knife or other utensil.
(1) Use ring terminals with insulating sleeves as shown in the figure to connect to the
terminal block.
(2) Securely clamp the ring terminals to the wires by using an appropriate tool so that the
wires do not come loose.
Strip : 10 mm
(3) Connect specified wires securely, and fasten them so that there is no stress applied on
the terminals.
(4) Use a screwdriver with an appropriate bit size to tighten the terminal screws. Using of
screwdriver with inappropriate bit size will damage the screw heads, and the screws
will not be tightened properly.
(5) Do not overtighten the terminal screws. Otherwise, the screws may break.
Screw with special washer
Ring terminal
Wire
Terminal blocks
(6) Refer to the table for the terminal screw tightening torques.
Tightening torque [N·m (kgf·cm)]
M4 screw
• Match the terminal block numbers and connection cable colors with those of the
outdoor unit. Incorrect wiring may cause a fire.
• Connect the connection cables firmly to the terminal block. Imperfect installation may
cause a fire.
• When fixing the connection cable with the cable clamp, always fasten the cable at the
plastic jacket portion, but not at the insulator portion. If the insulator is chafed, electric
leakage may occur.
• Always connect the ground (earth) wire. Improper earthing (grounding) work can
cause electric shocks.
• Do not use the ground (earth) screw for the indoor unit to the outdoor unit unless it is
specified.
Cable
clamp
Connection
cable
Ring terminal
Sleeve
Screw with special washer
Ring terminal
Wire
1.2 to 1.8 (12 to 18)
CAUTION