Protection Against Contamination When Installing Pipes; Example Of Connection - Panasonic Urban Multi U-8ME4XPQ Manual De Instalación

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 9.
1 Pinched piping
2 Do not dissolve this brazing
3 Auxilary pipe
4 Stop valve
5 Service port
6 Point of melting the brazing metal
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 the outdoor unit
NOTE All local interunit piping are field supplied except
the accessory pipes.
Front connection:
Remove the stop valve cover to connect. (See figure 11) (A)
Bottom connection:
Remove the knockout holes on the bottom frame and route the
piping under the bottom frame. (See figure 11) (B)
Installation manual
6
In case of U-8ME4XPQ, use the accessory joint for connecting
the suction gas accessory pipe (2) to the suction gas stop valve.
(See figure 11) (C)
1 Liquid pipe stop valve
2 Suction gas pipe stop valve
3 High pressure/low pressure gas pipe stop valve
4 Brazing
5 Liquid accessory pipe (1)
6 Suction gas accessory pipe (1)
7 High pressure/low pressure gas accessory pipe (1)
8 Accessory joint (angle 90°) (1)
9 Accessory joint (angle 90°) (2)
10 Liquid accessory pipe (2)
11 Suction gas accessory pipe (2)
12 High pressure/low pressure gas accessory pipe (2)
13 Accessory joint
NOTE Make sure that the onsite piping does not come in
contact with other piping, the bottom frame or side
panels of the unit.
4 Branching the refrigerant piping
For installation of the refrigerant branching kit, refer to the
installation manual delivered with the kit.
(See figure 14)
1 Horizontal surface
Follow the conditions listed below:
- Mount the refnet joint so that it branches either
horizontally or vertically.
- Mount the refnet header so that it branches horizontally.
5 Piping length restrictions
Make sure to perform the piping installation within the range of
the maximum allowable pipe length, allowable level difference
and allowable length after
"6.6. Example of connection" on page 7.
6.5. 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.
- Block all gaps in the holes for passing out piping and wiring
using sealing material (field supply). (The capacity of the unit
will drop and small animals may enter the machine.)
Example: passing piping out through the front
1
After all the piping has been connected, make sure there is
no gas leak. Use nitrogen to perform a gas leak check.
branching as indicated in
Protection method
Pinch the pipe
Pinch or tape the pipe
1 Plug the areas marked with
" ".
(When the piping is routed
from the front panel.)
U-8~16ME4XPQ
Urban Multi air conditioner
4PW40726-1A