Daikin VRV III REMQ72PBYD Engineering Data page 97

EDUS391004-N
Precautions when knocking out knock holes
• Open knock hole (large, small) 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
(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
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 (4 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,
dissolve the brazing using a burner and remove the pinch
piping.
3.
Connecting refrigerant piping to outdoor units
• Figure 12 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.
(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. Equalizer pipe shutoff valve
9. Brazing
10. Liquid side accessory pipe (1)
11. Suction gas side accessory pipe (1)
12. HP/LP gas side accessory pipe (1)
13. Equalizer side accessory pipe (1)
14. L type accessory joint (1)
15. L type accessory joint (2)
16. Liquid side accessory pipe (2)
17. Suction gas side accessory pipe (2)
18. HP/LP gas side accessory pipe (1)
19. Equalizer side accessory pipe (2)
NOTE
• Equalizer pipe is only for connection between outdoor units on
multi outdoor unit system.
That is not connect to indoor units.
• Make sure the onsite piping does not come into contact with other
piping or the bottom frame or side panels of the unit.
Installation of Outdoor Units
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
(2) The piping between outdoor units must be installed level
(Pattern 1) or with a rise (Pattern 2). Otherwise oil may pool in
the pipes.
Pattern 1
Front connections
to indoor unit
Piping between outdoor units
Level
Side (bottom) connections
to indoor unit
Piping between outdoor units
Pattern 2
Front connections
to indoor unit
Rise
Side (bottom) connections
to indoor unit
Change to pattern 1 or pattern 2
Prohibited pattern
Front connections
Downward
Downward inclination
inclination
Side (bottom) connections
to indoor unit
Downward inclination
(3) To avoid the risk of oil detention in the stopping unit, always
connect the shutoff valve and the piping between outdoor units
as shown A or B in the figure below.
A
B
Front connections
Installation
Unit Unit
A B
Unit Unit
A B
Unit Unit
A B
Rise
Unit Unit
A B
Rise
Oil remains in piping
Unit Unit
to indoor
A B
unit
Unit Unit
A B
A
B
Side (bottom) connections
3P215731-11R
97