Panasonic U-5MX4XPQ Installation Manual page 9

2 Removing the pinched piping
When connecting refrigerant piping to the outdoor unit, first
remove the pinched piping.
Removing of the pinched piping must be carried out according to
the following procedure:
1. Connect a charge hose to the service port of the liquid side
stop valve and to the service port of the gas side stop valve.
2. Remove the gas from the pinched piping.
3. When all the gas is removed from the pinched piping,
dissolve the brazing using a burner and remove the
pinched piping.
Any gas remaining inside the stop valve may blow off
the pinched piping, causing damage or injury.
See figure 6.
1 Service port
2 Gas side stop valve
3 Liquid side stop valve
4 Point of melting the brazing metal
5 Pinched piping
Precautions when connecting field piping.
Perform brazing at the gas stop valve before
brazing at the liquid stop valve.
Add brazing material as shown in the figure.
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.
3 One outdoor unit installed: In case of U-5~18MX4
(See figure 8)
Front connection:
Remove the stop valve cover to connect.
Bottom connection:
Remove the knock holes on the bottom frame and route the
piping under the bottom frame.
A Front connection
Remove the stop valve cover to connect.
B Bottom connection:
Remove the knock holes on the bottom frame and route the piping
under the bottom frame
1 Gas side stop valve
2 Liquid side stop valve
3 Service port for adding refrigerant
4 Gas side accessory pipe (1)
5 Gas side accessory pipe (2)
6 Liquid side accessory pipe (1)
7 Liquid side accessory pipe (2)
8 Brazing
9 Gas side piping (field supply)
10 Liquid side piping (field supply)
11 Punch the knockout holes (use a hammer)
U-5~18MX4XPQ
Urban Multi air conditioner
4PW28163-1
Processing the gas side accessory pipe (2)
Only in case of connecting at lateral side, cut the gas side
accessory pipe (2) as shown in figure 11.
1 Gas side accessory pipe
2 Cutting location
3 Gas side piping (field supply)
4 Base
Unit type A
5 HP 166
(mm)
8 HP 156
(mm)
10 HP 156
(mm)
12 HP 150
(mm)
14~18 HP 150
(mm)
NOTE When connecting the piping on site, be sure to
use the accessory piping.
Make sure the onsite piping does not come into
contact with other piping, the bottom frame or side
panels of the unit.
4 Outdoor units installed in a multiple outdoor unit system:
U-20~54MX4
Front connection:
Remove the stop valve cover to connect. (See figure 8)
Bottom connection:
Remove the knock holes on the bottom frame and route the
piping under the bottom frame. (See figure 8)
4.1 Precautions when connecting piping between outdoor
units (multiple outdoor unit system)
The 5 HP unit type cannot be used as an independent unit in
a multi system.
To connect the piping between outdoor units, an optional
multi connection piping kit CZ-32+48PJ4PQ is always
required. When installing the piping, follow the instructions in
the installation manual that comes with the kit.
Only proceed with piping work after considering the
limitations on installing listed here and in the chapter
"6.4. Connecting the refrigerant piping" on page 5, always
referring to the installation manual delivered with the kit.
4.2 Possible installation patterns and configurations
The piping between the outdoor units must be routed level or
slightly upward to avoid the risk of oil detention into the piping
side.
Pattern 1
1
1 To indoor unit
Pattern 2
1
1 To indoor unit
B C D
16 199 246
17 188 247
23 192 247
29 192 247
29 192 251
1
1
Installation manual
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