Installation manual
6
250C7Y1B
Split system air conditioner
4PW34720-1G – 07.2010
7.7.
Connecting the refrigerant piping
1
Installation of refrigerant branching kit.
(See figure 14)
For installation, refer to the installation manual delivered with the
kit. Follow the conditions listed below:
Mount the refnet joint so that it branches either horizontally (see
view
A
) or vertically.
2
Removing the pinched piping
3
Installation of refrigerant piping is possible as front connection or
side connection (when taken out from the bottom) as shown in
the figure below.
■
Front connection:
Remove the stop valve cover to connect.
(See figure 7)
■
Side (bottom) connection:
Remove the knock holes on the bottom frame and route the
piping under the bottom frame.
(See figure 7)
Precautions when knocking out knockout 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.
4
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
"7.4. Allowable pipe length and height difference" on page 5
.
1
Horizontal surface
Never remove the pinched piping by brazing.
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
Failure to observe the instructions in procedure below
properly may result in property damage or personal injury,
which may be serious depending on the circumstances.
Use the following procedure to remove the pinched piping:
1
Remove the valve lid and make sure
that the stop valves are fully closed.
2
Connect a charge hose to service ports of all stop
valves.
3
Recover gas and oil from the pinched piping by
using a recovery unit.
Do not vent gases into the atmosphere.
4
When all gas and oil is recovered from the pinched
piping, disconnect the charge hose and close the
service ports.
5
In case the pinched piping lower part looks like
detail
in the illustration, follow instructions as per
procedure steps 7+8.
In case the pinched piping lower part looks like
detail
in the illustration, follow instructions as per
procedure steps 6+7+8.
6
Cut off the lower part of the smaller pinched
piping with an appropriate tool (e.g. a pipe
cutter, a pair of nippers, ...) so that a cross-
section is open, allowing remaining oil to
drip out in case the recovery was not complete.
Wait until all oil is dripped out.
7
Cut the pinched piping off with a pipe cutter just
above the brazing point or just above the marking in
case there is no brazing point.
Never remove the pinched
piping by brazing.
8
Wait until all oil is dripped out in case the recovery
was not complete, and only then proceed with
connection of the field piping.
A
B
1
2
3
2
3
B
A
1
Service port
2
Stop valve
3
Point of pipe cutting just above
brazing point or above marking
A
Pinched piping
B
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.
1
Left-side connection
2
Front connection
3
Right-side connection
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)
1
2
3
