Example Of Connection - Panasonic U-5MX3XPQB Manual De Instalación

One outdoor unit installed: In case of U-5~16MX3
Front connection:
Remove the stop valve cover to connect. (See figure 6)
Side (bottom) connection:
Remove the knock holes on the bottom frame and route the piping
under the bottom frame. (See figure 6)
A Front connection
Remove the stop valve cover to connect.
B Side (bottom) connection:
Remove the knock holes on the bottom frame and route the piping
under the bottom frame
1 Flange (or flare nut in case of models U-5MX3-type)
2 Gas side pipe (1)(2)(3) supplied with the unit. (In case of U-5MX3-
type, field supply.)
3 Flare nut
4 Brazing (Except U-5MX3)
5 Liquid side piping (field supply)
6 Knockout hole (use a hammer)
7 Gas side piping (field supply)
When multiple outdoor units are installed: In case of
U-18~48MX3
Front connection:
Remove the stop valve cover to connect. (See figure 6)
Side (bottom) connection:
Remove the knock holes on the bottom frame and route the piping
under the bottom frame. (See figure 6)
To connect the piping between outdoor units, an optional piping kit
(multi connection piping kit) is always required. When installing the
piping, follow the instructions in the installation manual that comes
with the kit.
Restriction for the installation of the outdoor unit multi
connection piping kit
Install the joint horizontally within a incline of ±15° with the
caution nameplate on top. (See figure 24, part A)
Do not connect it vertically. (See figure 24, part B)
Reserve the straight part of 500 mm or more for the branch pipe
and do not bend the local pipe in that area. A straight part of
500 mm or more can be reserved if a local pipe (straight pipe) of
120 mm or more is connected to the joint. (See figure 24,
part C)
Incorrect installation may cause breakage of the outdoor unit.
(See figure 24)
1 Caution nameplate
2 Horizontal line
3 Ground
4 Straight part of 500 mm or more
5 Field piping (120 mm long or more)
D
D-arrow view
E
E-arrow view
Be sure to use the supplied accessory pipes when
carrying out piping work in the field.
Be sure that the field installed piping does not touch
other pipes, the bottom panel or side panel.
Especially for the bottom and side connection, be sure
to protect the piping with suitable insulation, to
prevent it from coming into contact with the casing.
Installation manual
5
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.
3 Make sure to perform the piping installation within the range of
the maximum allowable pipe length, allowable level difference
and allowable length after
"6.3. Example of connection" on page 8.
4 For installation of the refrigerant branching kit (Refnet), refer to
the installation manual delivered with the kit.
5 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 oxidised film on the inside of the pipes, adversely affecting
valves and compressors in the refrigerating system and
preventing normal operation.)
NOTE The pressure regulator for the nitrogen released when
doing the brazing should be set to 0.02 MPa or less.
(See figure 7)
1 Refrigerant piping
2 Location to be brazed
3 Nitrogen
4 Taping
5 Manual valve
6 Regulator
7 Nitrogen
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
6 Protection against contamination when installing pipes
- Take measures to prevent foreign materials like moisture and
contamination from mixing into the system.
Installation period
More than a month
Less than a month
Regardless of the
period
- Great caution is needed when passing copper tubes through
walls.
FLARE SHAPE and FLARENUT TIGHTENING TORQUE
Precautions when connecting pipes
See the following table for flare part machining dimensions.
When connecting the flare nuts, apply refrigerant oil to the inside
and outside of the flares and turn them three or four times at first.
(Use ester oil or ether oil.)
1 Piping union
2 Spanner
3 Flare nut
1 2 3 4
4 Torque wrench
When loosening a flare nut, always use two wrenches in
combination. When connecting the piping, always use a spanner
and torque wrench in combination to tighten the flare nut.
branching as indicated in
Protection method
Pinch the pipe
Pinch or tape the pipe
U-5~48MX3XPQB
Urban Multi air conditioner
4PW21867-1A