Pipe Connection; Electrical Wiring; Wiring System Diagram; Indoor Unit Wiring - Fujitsu ASU15RLS3Y Manual De Instalación

(3) Insert the fl are nut (always use the fl are nut attached to the indoor unit(s) and outdoor
unit respectively) onto the pipe and perform the fl are processing with a fl are tool. Use
the special R410A fl are tool, or the conventional fl are tool. Leakage of refrigerant may
result if other fl are nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
Die
A
Pipe
Dimension A [in. (mm)]
Pipe outside diameter
Flare tool for R410A,
[in. (mm)]
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
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 servicing
when necessary.
• In order to prevent water from leaking into the control box, make sure that the piping
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)
9320456030_IM.indb 5 9320456030_IM.indb 5
Check if [L] is flared uniformly
and is not cracked or scratched.
B
L
Dimension B [in. (mm)]
clutch type
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
diameter [in. (mm)]
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
Flare nut [in. (mm)] Tightening torque [lb·ft (N·m)]
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.

6. ELECTRICAL WIRING

Cable Cable size
Connection cable 14AWG
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

WARNING
• 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 mov-
ing 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)

6.2. Indoor unit wiring

1. Remove the wire cover. (Remove 1 screw.)
2. Remove the cable clamp.
3. Ring terminals connect to the connection cable.
4. Connect the ring terminals fully into the terminal block.
5. Fasten the connection cable with a cable clamp.
Cable clamp
Screw
Cable clamp
Screw
Insert the wire cover tab into the square hole
Connection cable
of the indoor unit and fasten with a screw.
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)
Remarks
3 cable+Earth (Ground),
1φ 208/230 V
OUTDOOR UNIT
Power line
Connect it to
Control line
the specifi ed
Earth (ground)
terminal.
line
Wire cover
Screw
Wire cover
Screw
En-5
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