English
5
•
Outside unit multi connection piping kit and refrigerant branching kit
(sold separately) are needed for connection of piping between out-
side units (in case of multi system) and piping branches.
Use only separately sold items selected specifically according to the
outside unit multi connection piping kit, the refrigerant branching kit
selection in the “
6-5 Example of connection
”.
6-2 Protection against contamination
when installing pipes
Protect the piping to prevent moisture, dirt, dust, etc. from enter-
ing the piping.
NOTE
Exercise special caution to prevent dirt or dust when passing piping
through holes in walls and when passing pipe edges to the exterior.
6-3 Pipe connection
•
Be sure to perform nitrogen permutation or nitrogen blow when
brazing.
(Refer to figure 8)
Brazing without performing nitrogen permutation or nitrogen blow
into the piping will create large quantities of oxidized film on the
inside of the pipes, adversely affecting valves and compressors in
the refrigerating system and preventing normal operation.
(Refer to figure 8)
1.
Refrigerant pipe
2.
Location to be brazed
3.
Nitrogen
4.
Taping
5.
Handy valve
6.
Regulator
•
The pressure regulator for the nitrogen released when doing the
brazing should be set to about 2.9 psi (Enough to feel a slight
breeze on your cheek).
NOTE
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
6-4 Connecting the refrigerant piping
1.
Direction to bring out the pipes
The local inter unit piping can be connected either forward or to the
sides (taken out through the bottom) as shown in the figure 9.
When passing out through the bottom, use the knock hole in the bot-
tom frame.
(Refer to figure 9)
1.
Left-side connection
2.
Front connection
3.
Right-side connection
Precautions when knocking out knock holes
•
Open knock hole (large, small) in the base frame by drilling the 4
concave around it with a
φ
-1/4”-bit.
(Refer to figure 10)
(Refer to figure 10)
1.
Knock hole
(large : for liquid pipe, suction gas pipe and HP/LP gas pipe)
2.
Knock hole (small : for equalizer pipe)
3.
Drill
4.
Concave section (4 points)
•
Be sure to avoid damaging the casing.
•
After knocking out the holes, we recommend you remove any burrs
and paint them using the repair paint to prevent rusting.
•
When passing electrical wiring through the knock holes, protect the wir-
ing with a conduit or bushings, making sure not to damage the wiring.
2.
Removing Pinch Piping
•
When connecting refrigerant piping to an outside unit, remove the
pinch piping using the procedure in the figure 11.
(Refer to figure 11)
•
About handling of shutoff valves, refer to [Shutoff valve operation
procedure] in
“11-1 Before working”
.
CAUTION
After removing the gass, remove the pinch piping.
Any gas remaining inside may blow off the pinch piping when you
dissolve the brazing, causing damage.
(Refer to figure 11)
1.
Pich piping (3 pieces)
2.
Do not remove the relay piping.
3.
Pinch piping
4.
Procedure 1 : Confirm the shutoff valve is closed.
5.
Procedure 2 : Connect a charge hose to the service port of
shutoff valve and remove the gas in the pinch piping.
6.
Procedure 3 : After removing the gas in the pinch piping, dis-
solve the brazing using a burner and remove the pinch piping.
3.
Connecting refrigerant piping to outside units
•
Figure 12 shows the example of connecting refrigerant piping to out-
side units.
•
The local inter unit piping next accesorry pipes are field supplyed.
(Refer to figure 12)
1.
When connected to the front
2.
When connected at lateral side (bottom)
3.
Remove the shutoff valve cover to connect.
4.
Remove the knock hole on the bottom frame and route the
piping under the bottom frame.
5.
Liquid pipe shutoff valve
6.
Suction gas pipe shutoff valve
7.
HP/LP gas pipe shutoff valve
8.
Brazing
9.
Liquid side accessory pipe (1)
10.
Suction gas side accessory pipe (1)
11.
HP/LP gas side accessory pipe (1)
12.
L type accessory joint (1)
13.
L type accessory joint (2)
14.
Liquid side accessory pipe (2)
15.
Suction gas side accessory pipe (2)
16.
HP/LP gas side accessory pipe (2)
17.
In case of 72PA type use the Accessory joint for connecting
the Suction gas side accessory pipe (2) to Suction gas side
shutoff valve.
18.
Accessory joint
NOTE
•
Make sure the onsite piping does not come into contact with other
piping or the bottom frame or side panels of the unit.
4.
Branching the refrigerant piping
Heed the restrictions below when installing the refrigerant branching
kit and read the installation instruction manual with the kit.
(Improper installation could lead to malfunctioning or breakdown of
the outside unit.)
<REFNET joint>
Install the REFNET joint so it splits horizontally or vertically.
(Refer to figure 13)
1.
Horizontal
2.
A-arrow view
3.
Horizontal surface
4.
±30° or less
5.
Vertical
<REFNET header>
Install the REFNET header so it splits horizontally.
(Refer to figure 14)
1.
Horizontal surface
2.
B-arrow view
Place
Installation period
Protection method
Outdoor
More than a month
Pinch the pipe
Less than a month
Pinch or tape the pipe
Indoor
Regardless of the period
