7
English
[When multiple outdoor units installed: In case of
RX18-48 type]
To connect the piping between outdoor units, an optional piping
kit (multi connection piping kit) is always required. When install-
ing the piping, follow the instructions in the installation manual
that comes with the kit.
•
Front connection:
Remove the shutoff valve cover to connect.
(Refer to figure 6)
•
Side (bottom) connection:
Remove the knock holes on the bottom frame and route the piping
under the bottom frame.
(Refer to figure 6)
1.
Front connection:
2.
Remove the shutoff valve cover to connect.
3.
Flange:
4.
(or flare nut in case of models RX5 type)
5.
Gas side accessory pipe (1) (2) (3) (4)
6.
Oil-equalizing piping shutoff valve (Except RX5)
7.
No piping work is needed.
8.
Flare nut
9.
Brazing
10.
Liquid side piping (field supply)
11.
Side (bottom) connection:
12.
Remove the knock holes on the bottom frame and route
the piping under the bottom frame.
13.
Knockout hole
14.
Punch the knock holes.
15.
Gas side piping (field supply)
16.
Oil-equalizing piping (field supply)
17.
Liquid side accessory pipe (1)(2)
Caution
Be sure to use the attached pipe when carrying out piping work
in the field.
Be sure that the local piping does not touch other pipes,
the bottom panel or side panel. Especially for the bottom
and side connection, be sure to protect the local piping
with the provided insulation, to prevent it from coming into
contact with the casing.
Precautions when knocking out knock holes
•
Be sure to avoid damaging the casing
•
After knocking out the holes, we recommend you paint the
edges and areas around the edges using the repair paint to
prevent rusting.
•
When passing electrical wiring through the knock holes, wrap
the wiring with protective tape to prevent damage.
•
Open knock holes around the 4 concave knock holes in the
base frame, using a
φ
6mm-bit drill.
(Refer to figure 7)
1.
Knock hole
2.
Drill
3.
Concave section
2.
Make sure to perform the piping installation within the range of the
maximum allowable pipe length, allowable level difference and
allowable length after branching as indicated in chapter “Example
of connection”
3.
For installation of the refrigerant branching kit, refer to the instal-
lation manual delivered with the kit.
Mount the REFNET joint so that it branches either horizontally
or vertically.
(Refer to figure 8)
1.
(Horizontal wires)
2.
(Up to ±30
°
or vertically.)
Mount the REFNET header so that it branches horizontally.
3.
(Horizontal wires)
4.
Pipe connection
•
Only use the flare nuts included with the unit.
Using different flare nuts may cause the refrigerant to leak.
•
Be sure to perform a nitrogen blow when brazing.
(Brazing without performing nitrogen replacement or releasing
nitrogen into the piping will create large quantities of oxidized
film on the inside of the pipes, adversely affecting valves and
compressors in the refrigerating system and preventing nor-
mal operation.)
•
Do not use a flux when brazing the refrigerant pipe joints.
Use phosphor copper brazing (BCup) which does not require
flux.
(Using a chlorine flux may cause the pipes to corrode, and if it
contains fluoride it may cause the refrigerant lubricant to dete-
riorate, adversely affecting the refrigerant piping system.)
Note
•
The pressure regulator for the nitrogen released when doing the
brazing should be set to 0.02 MPa(0.2kg/cm
2
) or less.
(Refer to figure 9)
1.
Refrigerant piping
2.
Location to be brazed
3.
Nitrogen
4.
Taping
5.
Manual valve
6.
Regulator
7.
Nitrogen
5.
Protection against contamination when installing pipes
•
Take measures to prevent foreign materials like moisture and
contamination from mixing into the system.
•
Great caution is needed when passing copper tubes through
walls.
Precautions when selecting branch piping.
Reducing the size of the main liquid piping
•
When the equivalent length is 30 m or less and the indoor side is
used in offices, etc.
(I.e. places where even barely audible sounds of refrigerant pass-
ing through the piping might be a problem. This does not include
use in households.)
(Refer to figure 10)
1.
Outdoor unit
2.
Main pipe
3.
Size down
4.
The first refrigerant branching kit.
5.
Indoor unit
[Liquid side]
RX5 type:
.....................................φ
9.5
➔
No need of size down
RX8-10 type:
................................φ
12.7
➔
φ
9.5 (Minmum thickness
φ
0.80mm)
RX12-16 type:
.............................φ
15.9
➔
φ
12.7 (Minmum thickness
φ
0.80mm)
RX18-24 type:
.............................φ
19.1
➔
φ
15.9 (Minmum thickness
φ
0.80mm)
RX26-48 type:
.............................φ
22.2
➔
φ
19.1 (Minmum thickness
φ
0.85mm)
Place
Installation period
Protection method
Outdoor
More than a month
Pinch the pipe
Less than a month
Pinch or tape the pipe
Indoor
Regardless of the period
01_3P114261-9L-EN.fm Page 7 Thursday, August 28, 2003 3:33 PM
