Daikin VRV III REMQ72PBYD, Инженерные данные, Страница: 52 / 130

EDUS391004-N Installation
Installation of Outdoor Units 51
• 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
bottom 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 in the base frame by drilling the 4 concave
around it with a

1/4”-bit. (Refer to figure 10)
(Refer to figure 10)
1. Knock hole (for liquid pipe and gas pipe)
2. Drill
3. Concave section (4 points)
• Be sure to avoid damaging the casing.
• After knocking out the holes, we recommend you to remove any
burrs and paint them using the repair paint to prevent rusting.
• When passing electrical wiring through the knock holes, protect the
wiring with a conduit or bushings, making sure not to damage the
wiring.
2.
Removing Pinch Piping
• When connecting refrigerant piping to an outdoor 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 gas, 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. Pinch piping (2 pieces)
2. Do not remove.
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,
dissolve the brazing using a burner and remove the pinch
piping.
3.
Connecting refrigerant piping to outdoor units
• Figure 12-1, 2 and 3 shows the example of connecting refrigerant
piping to outdoor units.
• The local inter unit piping next accessorry pipes are field supplied.
• About the detail of connecting pipes between outdoor units on
outdoor unit multi system, refer to the “
4. Precautions when
connecting piping between outdoor units ” and the installation
manual attached to the outdoor unit multi connection piping kit.
<In case of single system: 72~120P type>
(Refer to figure 12-1)
1. If 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. Gas side shutoff valve
6. Liquid side shutoff valve
7. Refrigerant charge port
8. Brazing
9. Liquid side accessory pipe (1)
10. Gas side accessory pipe (1)
11. Gas side accessory pipe (2)
12. Liquid side accessory pipe (2)
13. Knockout hole
14. Punch the knock hole.
15. Gas side piping (field supply)
16. Liquid side piping (field supply)
<In case of multi system: 144~360P type>
(Refer to figure 12-2)
1. If 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. Gas side shutoff valve
6. Liquid side shutoff valve
7. Refrigerant charge port
8. Brazing
9. Liquid side accessory pipe (1)
10. Gas side accessory pipe (1)
11. Gas side accessory pipe (2)
12. Liquid side accessory pipe (2)
13. Knockout hole
14. Punch the knock hole.
<In case of RXYQ144PBTJ>
(Refer to figure 12-3)
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. Gas pipe shutoff valve
7. Brazing
8. Liquid side accessory pipe (1)
9. Gas side accessory pipe (1)
10. L type accessory joint
11. Liquid side accessory pipe (2)
12. Gas side accessory pipe (2)
13. Installation for single unit system
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.
Precautions when connecting piping between outdoor units
The Outdoor unit multi connection piping kit (sold separately) is
needed to connect piping between outdoor units in multi system.
Only proceed with piping work after considering the limitations on
installation listed here and in
“5. Branching the refrigerant
piping” , always referring to the kit’s installation manual.
(1) About outdoor unit multi connection piping kit
• Install the joint horizontally so that the attached warning label
faces strait up, and the tilt is within ±15°.
(Refer to figure 13-1)
Do not install vertically. (Refer to figure 13-2)
• Maintain a straight portion of 19-5/8 in. or more until the split
of the joint without wrapping any onsite piping around this
area.
Over 19-5/8 in. of straight area can be maintained by
connecting at least 4-3/4 in. of onsite pipe (straight) to the
joint.
(Refer to figure 13-3)
(Refer to figure 13)
1. Warning label
2. Horizontal surface
3. ±15° or less
4. Ground
5. Onsite pipe (4-3/4 in. length or more)
6. Straight part of 19-5/8 in. or more
7. C-arrow view
8. D-arrow view
3P215731-10R