Fujitsu AGHG12KVCA Installation Manual Download Page 8

Page: 8 / 14

En-8

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.

Connection
cable

Cable
clamp

40 mm

30 mm

Cable clamp

Unit: mm

Terminal cover

Ground (Earth)
wire

Screw

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

Ring terminal

Sleeve

(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

Wire

Ring terminal

Terminal blocks

Wire

Screw with special washer

Ring terminal

(6) Refer to the table for the terminal screw tightening torques.

Tightening torque [N·m (kgf·cm)]

M4 screw

1.2 to 1.8 (12 to 18)

CAUTION

• 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.

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.)

Wrench (fixed)

Connection pipe

Flare nut

Indoor unit pipe

Tighten with two wrenches.

Torque wrench

Flare nut [mm (in.)]

Tightening torque [N·m (kgf·cm)]

6.35 (1/4) dia.

16 to 18 (160 to 180)

9.52 (3/8) dia.

32 to 42 (320 to 420)

12.70 (1/2) dia.

49 to 61 (490 to 610)

15.88 (5/8) dia.

63 to 75 (630 to 750)

19.05 (3/4) dia.

90 to 110 (900 to 1,100)

Do not remove the cap from the connection pipe before connecting the pipe.

3.4. Electrical wiring

WARNING

• 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.

CAUTION

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

Indoor unit

Ground (Earth) line

Outdoor unit

Power line

Control line

Connection cable

■

Wired remote controller cable (option)