Electrical Wiring - Fujitsu 9318739183 Installation Manual

Dimension A [in. (mm)]
Pipe outside diameter
Flare tool for R410A,
[in. (mm)]
clutch type
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
When using conventional fl are tools to fl are R410A pipes, the dimension A should be
approximately 0.020 in. (0.5 mm) more than indicated in the table (for fl aring with R410A
flare tools) to achieve the specified flaring. Use a thickness gauge to measure the
dimension A.
Width across
flats
flats diameter [in. (mm)]
5.6.2. Bending pipes
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes in an angle more than 90°.
• When pipes are repeatedly bend or stretched, the material will harden, making it diffi cult
to bend or stretch them anymore.
• Do not bend or stretch the pipes more than 3 times.
• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will break.
5.6.3. Pipe connection
• Be sure to Install the pipe against the port on the indoor unit correctly. If the center-
ing is improper, the fl are nut cannot tighten smoothly. If the fl are nut is forced to
turn, the threads will be damaged.
• Do not remove the fl are nut from the indoor unit pipe until immediately before con-
necting the connection pipe.
• Hold the torque wrench at its grip, keeping it in the right angle with the pipe, in order
to tighten the fl are nut correctly.
• Tighten the fl are nuts with a torque wrench using the specifi ed tightening method.
Otherwise, the fl are nuts could break after a prolonged period, causing refrigerant
to leak and generate hazardous gas if the refrigerant comes into contact with a fl ame.
• Connect the piping so that the control box cover can easily be removed for servic-
ing when necessary.
• In order to prevent water from leaking into the control box, make sure that the pip-
ing is well insulated.
When the flare nut is tightened properly by your hand, hold the body side coupling with a
wrench, then tighten with a torque wrench. (See the table below for the flare nut tightening
torques.)
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [in. (mm)]
1/4 (6.35) dia.
3/8 (9.52) dia.
1/2 (12.70) dia.
5/8 (15.88) dia.
3/4 (19.05) dia.
Dimension B [in. (mm)]
3/8 (9.1)
1/2 (13.2)
0 to 0.020
5/8 (16.6)
(0 to 0.5)
3/4 (19.7)
15/16 (24.0)
Pipe outside
Width across flats of
Flare nut [in. (mm)]
1/4 (6.35)
11/16 (17)
3/8 (9.52)
7/8 (22)
1/2 (12.70)
1 (26)
5/8 (15.88)
1-1/8 (29)
3/4 (19.05)
1-7/16 (36)
CAUTION
CAUTION
CAUTION
Tighten with two wrenches.
Holding wrench
Flare nut
Connection pipe
Tightening torque [lb·ft (N·m)]
11.8 to 13.3 (16 to 18)
23.6 to 31.0 (32 to 42)
36.1 to 45.0 (49 to 61)
46.5 to 55.3 (63 to 75)
66.4 to 81.1 (90 to 110)

6. ELECTRICAL WIRING

Cable Cable size
Connection cable 14AWG UL 1505
Max. Cable Length: Limit voltage drop to less than 2%. Increase cable gauge if voltage drop is
2% or more.
6.1. Wiring system diagram
Before connecting the wires, make sure the power supply is OFF.
Every wire must be connected fi rmly.
No wire should be allowed to touch refrigerant tubing, the compressor or any moving
part.
Loose wiring may cause the terminal to overheat or result in unit malfunction. A fi re
hazard may also exist. Therefore, be sure all wiring is tightly connected.
Connect wires to the matching numbers of terminals.
INDOOR UNIT SIDE
INDOOR UNIT
TERMINAL
DISCONNECT
SWITCH
(Locally purchased)
Disconnect switch - fi eld supplied if required by local code. Select the correct capacity of dis-
connect switch according to the load.
Indoor unit
terminal block
Earth
(Ground)
screw
• To connect the indoor unit wires to the terminal correctly, refer to the fi gure for proper
length.
14AWG
7-1/2 in.
(190 mm)
Remarks
3 cable+Earth (Ground),
1φ 208/230 V
WARNING
OUTDOOR UNIT
Power line
Connect it to
Control line
the specifi ed
terminal.
Earth
(ground) line
Disconnect switch
Outdoor unit
Connect it to
the specifi ed
terminal.
Earth (Ground) wire
6-7/8 in.
(175 mm)
Conduit holder
Conduit connector
En-5