6.3. Pipe size (Unit: mm)
6.4.1 SBOX pipe size
Model SBOX01 SBOX2 &
SBOX02E
SBOX04 &
SBOX04E
SBOX06
SBOX
main con-
nection
pipes
Liquid
pipe
Φ9.5 Φ12.7 Φ15.9 Φ15.9
High
pressure
gas pipe
Φ15.9 Φ19.1 Φ22.2 Φ22.2
Low
pressure
gas pipe
Φ19.1 Φ25.4 Φ31.8 Φ31.8
SBOX to
indoor
unit con-
nection
pipe
Liquid
pipe
Φ9.5 Φ9.5 Φ9.5 Φ9.5
Low
pressure
gas pipe
Φ15.9 Φ15.9 Φ15.9 Φ15.9
6.4.2 Indoor unit pipe size
Lower side
indoor unit
capacity A
(×100W)
Branch pipe side (mm) Suitable
branch pipe
Gas pipe Liquid side
22≤A≤45 Φ12.7 Φ6.4 IDU-BJ01
45<A≤160 Φ15.9 Φ9.5 IDU-BJ01
6.4. The Procedure of Connecting Pipes
1) Connect the indoor unit first, and then connect the outdoor unit.
a. The pipe bend should be handled carefully, without damaging the pipe and
insulation layer. Ensure once you have installed the indoor unit, cover with
plastic to stop dirt and dust collecting inside the unit. Failure to do so will
cause damage to the unit.
b. Before tightening up the flare nut, apply refrigerant oil at the outer surface of
the pipe. Screw up the nut for 3~4 circles beforehand (see Fig.6-1).
c. Ensure when connecting and disconnecting pipe work, use two spanners
simultaneously.
d. Ensure that you don’t over tighten the flare nut. This will deform the
connection pipe on the indoor unit and cause leaks.
2) Ensure when making flare you tape/cover the inlet of the indoor unit, to
ensure no impurities go inside the unit.
3) After connecting all the pipe work, ensure you flush the system through with
nitrogen and pressure test according to outdoor installation manual.
i.The bend angle shall not exceed 90°. (See Fig.6-2)
ii. Where possible use long radius bends to help flow of refrigerant.
iii. Do not bend the pipe more than three times.
i. When bending the pipe, measure the pipe length required, mark bend
position and bend with benders.
ii. Longer radius elbows are recommended to help flow of refrigerant.
iii. Always use pipe benders when bending pipe.
2. Fixing pipe work
1) Ensure you use appropriate brackets for supporting pipe work.
2) Ensure the liquid pipe and the suction pipe feeding one unit are bound
together, with the correct cable.
3) When installing pipe work through walls, you need to protect pipe work with
large plastic pipe work.
Table: 6-4
Apply refrigerant oil
Table: 6-3
Fig.6-1
Use a thumb to bend the pipe
Minimum radius 100mm
When rolling out copper pipe, ensure
there are no kinks or imperfections in
the pipe work.
Fig.6-2
Fig.6-3
8 | INSTALL THE CONNECTING PIPE
6720862460 (16/04) CLIMATE 5000 VRF
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