Connecting The Refrigerant Piping - Panasonic U-8ME4XPQM Manuel D'installation

6.4.

Connecting the refrigerant piping

1 Front connection or side connection
Installation of refrigerant piping is possible as front connection or
side connection (when taken out from the bottom) as shown in
the figure.
3
2
1 1
NOTE Precautions when knocking out knockout
holes
Be sure to avoid damaging the casing
After knocking out the knockout holes, we
recommend you remove the burrs and paint
the edges and areas around the edges using
repair paint to prevent rusting.
When passing electrical wiring through the
knockout
protective tape to prevent damage.
4 1 3 2 4
2 Removing the pinched piping
When connecting refrigerant piping to the outdoor unit, first
remove the pinched piping. Do not vent gases into the
atmosphere.
Removing of the pinched piping must be carried out according to
the following procedure:
1. Make sure the stop valves are closed.
2. Connect a charge hose to the service ports of all stop
valves.
3. Recover the gas from the pinched piping.
4. When all the gas is recovered 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 Pinched piping
2 Do not dissolve this brazing
3 Auxiliary pipe
4 Stop valve
5 Service port
6 Point of melting the brazing metal
U-8~16ME4XPQM
Urban Multi air conditioner
4PW40728-1
1 Left-side connection
2 Front connection
3 Right-side connection
holes, wrap the wiring with
1 Large knockout hole
2 Small knockout hole
3 Drill
4 Points for drilling
Precautions when connecting field piping.
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 Connecting refrigerant piping to outdoor units
NOTE All local interunit piping are field supplied except
the accessory pipes.
Front connection:
Remove the stop valve cover to connect. (See figure 9) (A)
Bottom connection:
Remove the knockout holes on the bottom frame and route the
piping under the bottom frame. (See figure 9) (B)
1 Liquid pipe stop valve
2 Suction gas pipe stop valve
3 High pressure/low pressure gas pipe stop valve
4 Equalizer pipe stop valve
5 Brazing
6 Liquid side accessory pipe (1)
7 Suction gas side accessory pipe (1)
8 High pressure/low pressure gas side accessory pipe (1)
9 Equalizer side accessory pipe (1)
10 Accessory joint (angle 90°) (1)
11 Accessory joint (angle 90°) (2)
12 Liquid side accessory pipe (2)
13 Suction gas side accessory pipe (2)
14 In case of U-8XPQM, U-10XPQM or U-12XPQM:
High pressure/low pressure gas side accessory pipe (1)
(This pipe has to be cut at a length of 160 mm)
In case of U-14XPQM or U-16XPQM:
High pressure/low pressure gas side accessory pipe (2)
15 Equalizer side accessory pipe (2)
Equalizer pipe:
The equalizer pipe is used only to establish interconnection of
outdoor units in a multi outdoor system.
When the equalizer pipe is used to establish interconnection of 3
outdoor units, refer to the installation manual of the outdoor unit
multi connection piping kit.
NOTE Make sure that the onsite piping does not come in
contact with other piping, the bottom frame or side
panels of the unit.
Installation manual
6