Connecting The Refrigerant Piping - Daikin VRV II RXYQ5MY1B Installation Manual

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 2
1. Left-side connection
2. Front connection
3. Right-side connection
[One outdoor unit installed: In case of RXYQ5-16MY1B]
• Front connection:
Remove the shutoff valve cover to connect.
(Refer to figure 6)
• Side (bottom) connection:
Remove the knock holes on the bottom frame and route the piping
under the bottom frame.
(Refer to figure 6)
[When multiple outdoor units installed: In case of
RXYQ18-48MY1B]
To connect the piping between outdoor units, an optional piping
kit (multi connection piping kit) is always required. When install-
ing the piping, follow the instructions in the installation manual
that comes with the kit.
• Front connection:
Remove the shutoff valve cover to connect.
(Refer to figure 6)
• Side (bottom) connection:
Remove the knock holes on the bottom frame and route the piping
under the bottom frame.
(Refer to figure 6)
1. Front connection:
2. Remove the shutoff valve cover to connect.
3. Flange:
4. (or flare nut in case of models Q5 type)
5. Gas side accessory pipe (1) (2) (3)
6. (In case of Q5 type, field supply.)
7. Oil-equalizing piping shutoff valve (Except Q5)
8. No piping work is needed.
9. Flare nut
10. Brazing
11. Liquid side piping (field supply)
12. Side (bottom) connection:
13. Remove the knock holes on the bottom frame and route
the piping under the bottom frame.
14. Knockout hole
15. Punch the knock holes.
16. Liquid side piping (field supply)
17. Oil-equalizing piping (field supply)
Caution
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.
Precautions when knocking out knock 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.
• Open knock holes around the 4 concave knock holes in the
base frame, using a φ6mm-bit drill.
7
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 chapter "Example
of connection"
3.
For installation of the refrigerant branching kit, refer to the instal-
lation manual delivered with the kit.
3
4.
Pipe connection
•
•
•
Note
• The pressure regulator for the nitrogen released when doing the
brazing should be set to 0.02 MPa(0.2kg/cm
5.
Protection against contamination when installing pipes
•
Place
Outdoor
Indoor
•
Precautions when selecting branch piping.
• If the piping between the outdoor units is 90m or longer, be sure
to enlarge the main pipe in the liquid-side and gas-side branch
piping. (This does not apply to Q5 type)
Depending on the length of the refrigerant piping, the power may
drop, but even in such cases it is ok to enlarge the main pipe.
(Refer to figure 7)
1. Knock hole
2. Drill
3. Concave section
Mount the REFNET joint so that it branches either horizontally
or vertically.
(Refer to figure 8)
1. (Horizontal wires)
2. (Up to ±30° or vertically.)
Mount the REFNET header so that it branches horizontally.
3. (Horizontal wires)
Only use the flare nuts included with the unit.
Using different flare nuts may cause the refrigerant to leak.
Be sure to perform a nitrogen blow when brazing.
(Brazing without performing nitrogen replacement or releasing
nitrogen 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 nor-
mal operation.)
Do not use a flux when brazing the refrigerant pipe joints.
Use phosphor copper brazing (BCup) which does not require
flux.
(Using a chlorine flux may cause the pipes to corrode, and if it
contains fluoride it may cause the refrigerant lubricant to dete-
riorate, adversely affecting the refrigerant piping
(Refer to figure 9)
1. Refrigerant piping
2. Location to be brazed
3. Nitrogen
4. Taping
5. Manual valve
6. Regulator
7. Nitrogen
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.
(Refer to figure 10)
1. Outdoor unit
2. Main pipe
3. Enlarge
4. The first refrigerant branching kit.
5. Indoor unit
[Gas side]
RXYQ5MY1B type: .....................φ15.9➔ φ19.1 (Minmum thickness φ1.00mm)
RXYQ8MY1B type: .....................φ19.1➔ φ22.2 (Minmum thickness φ1.00mm)
RXYQ10MY1B type: ..................φ22.2➔ φ25.4 (Minmum thickness φ1.00mm)
RXYQ12-14MY1B type: .............φ28.6➔ Not Increased
RXYQ16-22MY1B type: .............φ28.6➔ φ31.8 (Minmum thickness φ1.10mm)
RXYQ24MY1B type: ..................φ34.9➔ Not Increased
RXYQ26-34MY1B type: .............φ34.9➔ φ38.1 (Minmum thickness φ1.10mm)
RXYQ36-48MY1B type: .............φ41.3➔ Not Increased
[Liquid side]
RXYQ5MY1B type: .....................φ9.5➔ Not Increased
RXYQ8-10MY1B type: ...............φ9.5➔ φ12.7 (Minmum thickness φ0.80mm)
RXYQ12-16MY1B type: .............φ12.7➔ φ15.9 (Minmum thickness φ1.00mm)
RXYQ18-24MY1B type: .............φ15.9➔ φ19.1 (Minmum thickness φ1.00mm)
RXYQ26-48MY1B type: .............φ19.1➔ φ22.2 (Minmum thickness φ1.00mm)
system.)
2 ) or less.
Protection method
Pinch the pipe
Pinch or tape the pipe
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