9
Ex: passing piping out through the front
1.
Plug the areas marked with “
”.
(When the piping is routed from the front panel.)
2.
Suction gas side piping
3.
Liquid side piping
4.
Discharge gas side piping
•
Use a nut with a resin clip plate to protect the nut tightening part from
rusting.
6. REFRIGERANT PIPING
NOTE
•
After completing installation, be sure to open the valves.
(See
6-6 Additional refrigerant charge
for details) (Operating the
unit with the valves shut will break the compressor.)
Use R410A to add refrigerant. (The R410A refrigerant cylinder has a
pink stripe painted around it.)
All field piping must be installed by a licensed refrigeration technician
and must comply with relevant local and national regulations.
• CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING
Do not use flux when brazing copper-to copper refrigerant piping. (Par-
ticularly for the HFC refrigerant piping) Therefore, use the phosphor
copper brazing filler metal (B-Cu93P-710/795: ISO 3677) which does
not require flux.
(Flux has extremely harmful influence on refrigerant piping sys-
tems. For instance, if the chlorine based flux is used, it will cause
pipe corrosion or, in particular, if the flux contains fluorine, it will
damage the refrigerant oil.)
•
Installation tools:
Make sure to use installation tools (gauge manifold charge hose,
etc.) that are exclusively used for R410A installations to withstand
the pressure and to prevent foreign materials (e.g. mineral oils such
as SUNISO and moisture) from mixing into the system.
(The screw specifications differ for R410A.)
Vacuum pump (use a 2-stage vacuum pump with a non-return valve):
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 pipping:
•
construction material: Phosphoric acid deoxidized seamless cop-
per for refrigerant.
•
size: Determine the proper size referring to chapter “Example of
connection”.
•
The wall thickness of the refrigerant piping should comply with
relevant local and national regulations.
3.
Make sure to use the particular branches of piping that have been
selected referring to chapter “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
2.
Front connection
3.
Right-side connection
[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 pip-
ing under the bottom frame.
[Multiple outdoor units installed]
To connect the piping between outdoor units, an optional piping
kit (multi connection piping kit) is always required. When installing
the piping, follow the instructions 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 pip-
ing under the bottom frame.
(Refer to figure 6)
1.
Front connection
2.
Remove the stop valve cover to connect.
3.
Suction gas side accessory pipe (1) (2) (3)
4.
Discharge gas side accessory pipe (1)(2)(3)
5.
Suction gas line
6.
Liquid line
7.
Oil-equalizing piping stop valve
8.
No piping work is needed.
9.
Flare nut
10.
Discharge gas line
11.
Liquid side piping (field supply)
12.
Side (bottom) connection
13.
Remove the knockout holes on the bottom frame and route
the piping under the bottom frame.
14.
Knockout hole
15.
Punch the knockout holes.
16.
Discharge gas piping (field supply)
17.
Liquid piping (field supply)
18.
Suction gas piping (field supply)
19.
Oil-equalizing piping (field supply)
20.
Same as above
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 prevent it from coming into contact
with the casing.
1
2
3
4
Resin clip plate
1
2
3
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