Installation Manual

En-14
5.3.3. Pipe connection
(1) Detach the caps and plugs from the pipes.
CAUTION
Be sure to apply the pipe against the port on the unit correctly. If the centering is improper, the fl are nut cannot be tightened
smoothly. If the fl are nut is forced to turn, the threads will be damaged.
Do not remove the fl are nut from the pipe until immediately before connecting 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.
(2) Centering the pipe against port on the unit, turn the fl are
nut with hand.
To prevent gas leakage, apply the
refrigeration compressor oil (or
equivalent) used for the outdoor unit
to the fl are surface.
Do not use mineral oil.
Connection
pipe (Liquid)
Connection
pipe (Gas)
(3) When the fl are nut is tightened properly by hand, use a
torque wrench to fi nally tighten it.
Body side
Holding spanner
Torque wrench
Do not remove the cap from the connection pipe before connecting the pipe.
CAUTION
Be sure to connect the large pipe after connecting the small pipe completely.
(4)
Branch box is marked with engraved letters indicating
each corresponding indoor unit (UNIT A, UNIT B and
UNIT C).
UNIT A : Refrigerant pipe connection port for UNIT A
UNIT B : Refrigerant pipe connection port for UNIT B
UNIT C : Refrigerant pipe connection port for UNIT C
UNIT A
(
gas pipe
)
UNIT A
(
liquid pipe
)
UNIT B
(
gas pipe
)
UNIT C
(
gas pipe
)
UNIT B
(
liquid pipe
)
UNIT C
(
liquid pipe
)
5.3.4. Adapter installation
• Attach the adapters (accessories) to the ports on the gas
pipe of the Branch box (Indoor unit side) according to the
size of the pipe to be connected.
• Apply the refrigeration compressor oil (or equivalent) used
for the outdoor unit to the attaching portion of the adapters.
• Tighten the adapter using a torque wrench according to the
tightening torque values in the table below.
Adapter
[mm (in.)]
Tightening torque
[N·m (Ib·ft)]
Ø 12.7 (1/2)
➝
Ø 9.52 (3/8)
49 to 61 (36.0 to 44.8)
Ø 12.7 (1/2)
➝
Ø 15.88 (5/8)
Flare nut
[mm(in.)]
Tightening torque
[N·m (Ib·ft)]
6.35 (1/4) dia. 16 to 18 (11.8 to 13.2)
9.52 (3/8) dia. 32 to 42 (23.5 to 30.9)
12.70 (1/2) dia. 49 to 61 (36.0 to 44.8)
15.88 (5/8) dia. 63 to 75 (46.3 to 55.1)
CAUTION
Label all the refrigerant piping (liquid pipe, gas pipe)
specifying to which indoor units they will be connected.
5.3.2. Bending pipes
The pipes are shaped by your hands. Be careful not to collapse them. Do not bend the pipes in an angle more than 90°.
When pipes are repeatedly bent or stretched, the material will harden, making it diffi cult to bend or stretch them any more. Do
not bend or stretch the pipes more than 3 times.
CAUTION
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of 100 mm (4 in.) or over.
If the pipe is bent repeatedly at the same place, it will break.
9380120001-06 EN.indd 149380120001-06 EN.indd 14 6/16/2558 BE 8:20 PM6/16/2558 BE 8:20 PM