Daikin VRV III REMQ120PBTJ, Инженерные данные

Страница: 74 / 130

Installation EDUS391004-N
74 Installation of Outdoor Units
(Refer to figure 7)
1. Foundation bolt point (

9/16 in. dia, : 4 positions)
2. (Depth of product)
3. (Inner dimension of the base)
4. (Outer dimension of the base)
NOTE
• There are restrictions on the refrigerant pipe connecting order
between outdoor unit in the case of the multi system.
See
“2-1 Combination” for detail.
• When installing on a roof, make sure the roof floor is strong
enough and be sure to water-proof all work.
• Make sure the area around the machine drains properly by setting
up drainage grooves around the foundation.
Drain water is sometimes discharged from the outdoor unit when it
is running.
• For anti-corrosion type, use nuts with resin washers. If the paint on
nut connections comes off, the anti-corrosion effect may decrease.
6. REFRIGERANT PIPING
NOTE
• All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and national
regulations.
• After piping work is complete, do not under any circumstances
open the shutoff valve until
“7. FIELD WIRING” and “10.
CHECKING OF DEVICE AND INSTALLATION CONDITIONS”
are complete.
• Do not use flux when brazing the refrigerant piping. Use the phosphor
copper brazing filler metal (B-Cu93P-710/795 : ISO 3677) which does
not require flux.
(Flux has extremely negative effect on refrigerant piping systems. 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.)
6-1 Selection of piping material and Refrigerant
branching kit
• Use only pipes which are clean inside and outside and which do
not accumulate harmful sulfur, oxidants, dirt, cutting oils, moisture,
or other contamination. (Foreign materials inside pipes including
oils for fabrication must be 0.14 gr/10 ft or less.)
• Use the following items for the refrigerant piping.
Material : Jointless phosphor-deoxidized copper pipe
Size : See “6-5 Example of connection” to determine the
correct size.
Thickness : Select a thickness for the refrigerant piping which
complies with national and local laws.
• For piping work, follow the maximum tolerated length, difference in
height, and length after a branch indicated in the “
6-5 Example of
connection ”.
• Outdoor unit multi connection piping kit and refrigerant branching
kit (sold separately) are needed for connection of piping between
outdoor units (in case of multi system) and piping branches.
Use only separately sold items selected specifically according to
the outdoor 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
entering 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
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 (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” .
Resin washers
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
3P215731-12R