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EDUS39-605
Vacuum pump should be 2-stage with a non-return valve
using the following precautions:
1. Make sure the pump oil does not flow oppositely into the
system while the pump is not working.
2. Use a vacuum pump which can evacuate to –14.6 psi.
6-1 Selection of piping material
1. Foreign materials inside pipes, including oils for fabrication,
must be 9mg/10ft. or less.
2. Use the following material specification for refrigerant pip-
ping:
construction material: Phosphoric acid deoxidized
seamless copper for refrigerant.
size: Determine the proper size referring to chapter See
Section 6-3, Example of Connection.
The wall thickness of the refrigerant piping should com-
ply with relevant local and national regulations.
3. Make sure to use the particular branches of piping that
have been selected referring to chapter See Section 6-3,
Example of Connection.
6-2 Connecting the refrigerant piping
1. The local branch piping can be connected either forward or
to the sides (taken out of the bottom) as shown in the figure.
1
Left-side connection
1.
Front connection
2.
Right-side connection
3.
One outdoor unit installed:
Front connection:
Remove the stop valve cover to connect.
Refer to figure 6.
Side (bottom) connection:
Remove the knockout holes on the bottom frame and route the piping
under the bottom frame.
Multiple outdoor units installed
To connect the piping between outdoor
units, an optional piping kit (multi connec-
tion piping kit) is always required. When
installing the piping, follow the instruc-
tions in the installation manual that comes
with the kit.
Front connection:
Remove the stop valve cover to connect.
Refer to figure 6.
Side (bottom) connection:
Remove the knockout holes on the bottom frame and route
the piping under the bottom frame.
Refer to figure 6.
Front connection
1.
Remove the stop valve cover to connect.
Installation of Outdoor Units
2
3
:
Suction gas side accessory pipe (1) (2) (3)
2.
Discharge gas side accessory pipe (1)(2)(3)
3.
Suction gas line
4.
Liquid line
5.
Oil-equalizing piping stop valve
6.
No piping work is needed.
7.
Flare nut
8.
Discharge gas line
9.
Liquid side piping (field supply)
10.
Side (bottom) connection
11.
Remove the knockout holes on the bottom frame
12.
and route the piping under the bottom frame.
Knockout hole
13.
Punch the knockout holes.
14.
Discharge gas piping (field supply)
15.
Liquid piping (field supply)
16.
Suction gas piping (field supply)
17.
Oil-equalizing piping (field supply)
18.
Same as above
19.
NOTE
Be sure to use the attached pipe when carrying out piping
work in the field.
Be sure that the local piping does not touch other
pipes, the bottom panel or side panel. Especially for
the bottom and side connection, be sure to protect
the local piping with the provided insulation, to pre-
vent it from coming into contact with the casing.
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 knockout
holes, wrap the wiring with protective tape to prevent
damage.
Open knockout holes around the 4 concave knockout
holes in the base frame, using a
Refer to figure 7.
Knockout hole
1.
Drill
2.
Concave section
3.
2. 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 Section 6-3, Example of Connection.
3. For installation of the refrigerant branching kit, refer to the
installation manual delivered with the kit.
Mount the REFNET joint so that it branches either hori-
zontally or vertically.
Refer to figure 8.
Horizontal connections
1.
Up to ±30× or vertically.
2.
Mount the REFNET header so that it branches horizon-
tally.
Horizontal connections
3.
4. Pipe connection
Only use the flare nuts included with the unit.
Using different flare nuts may cause the refrigerant to
leak.
Installation
φ
1/4"-bit drill.
46

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