Daikin R-410A User manual

EDUS39-605
Installation of Outdoor Units 1
VRV Installation
1. Center of Gravity ............................................................... 1
2. Foundation Drawing........................................................... 2
3. REFNET Pipe System ...................................................... 3
3.1. Layout Example .......................................................... 3
3.2. Field Refrigerant Piping .............................................. 5
3.3. REFNET Joints and Headers ..................................... 6
4. REFNET Pipe System ....................................................... 8
4.1. REFNET Joint (Branch Kit)........................................ 8
4.2. REFNET Header(Branch Kit)...................................... 10
4.3. Outdoor Unit Multi-Connection Piping Kit .................. 12
5. Installation ......................................................................... 15
5.1. RXYQ-M .................................................................... 15
5.2. Safety Considerations................................................. 18
5.3. REYQ-M .................................................................... 37

Center of Gravity EDUS39-605
2 Installation of Outdoor Units
1. Center of Gravity
RXYQ72/96MTJU
REYQ72/96MTJU
4D045330

EDUS39-605 Foundation Drawing
Installation of Outdoor Units 3
2. Foundation Drawing
RXYQ72/96MTJU
REYQ72/96MTJU
3D042653A

REFNET Pipe System EDUS39-605
4 Installation of Outdoor Units
3. REFNET Pipe System
3.1 Layout Example
3.1.1 Heat Pump System
Use of the particular branch fitting appropriate to each individual unit type not only permits the pipes to be laid
with ease but also increases the reliability of the system as a whole.
Units can be added by connecting them directly to the REFNET header or REFNET joint. Further REFNET joints
cannot be included in the system downsteam of a REFNET header.
Notes
1. When the capacity ratio of the indoor system to the outdoor unit is more than 100% and when all the indoor units are
in operation at the same time, then the rated capacity of each unit is somewhat reduced.
2. Special purpose REFNET pipe components must be used for all the pipe work. For further details concerning types
of components see Section 6.3 Example of Connection.
Typeof
fitting
Sample systems
Line branch fitting
(Pipes containing REFNET joints only)
Header branch fitting
(Piping consists of REFNET headers only)
Mixed branch fittings
(Piping including both headers
and joints)

EDUS39-605 REFNET Pipe System
Installation of Outdoor Units 5
3.1.2 Heat Recovery System
Use of the particular branch fitting appropriate to each individual unit type not only permits the pipes to be laid
with ease but also increases the reliability of the system as a whole.
Units can be added by connecting them directly to the REFNET header or REFNET joint. Further branches cannot be
included in the system below the REFNET header branch.
Notes
1. When the capacity ratio of the indoor system to the outdoor unit is more than 100% and when all the indoor units are
in operation at the same time, the rated capacity of each unit is somewhat reduced.
2. Special purpose REFNET pipe components must be used for all the pipe work. For further details concerning choice
and type of components refer to Section 6.3 Example of Connection.
Typeof
fitting
Sample systems
Distribution by REFNET jointsDistribution by REFNET header
Combination of REFNET joints
and headers

REFNET Pipe System EDUS39-605
6 Installation of Outdoor Units
3.2 Field Refrigerant Piping
3.2.1 Heat Pump Series
1. The following materials should be used for all refrigerant piping:
Materials: Deoxidized phosphorous seamless copper pipe or equivalent
2. The tips for insulation
Both Gas and liquid piping must be insulated.
Materials: Glass fiber or heat resistant polyethylene foam
Thickness: 1/2 inch or more
Heat resistance: Gas pipe : 250°F or more / Liquid pipe : 160°F or more
3.2.2 Heat Recovery Series
Suction, discharge gas piping, and liquid piping must be insulated.
Example of thermal insulation work:
Insulation of single pipe only Insulation of both liquid and gas pipe
3 piping section (between outdoor unit and BS unit) 2 piping section (between BS unit and indoor unit)

EDUS39-605 REFNET Pipe System
Installation of Outdoor Units 7
3.3 REFNET Joints and Headers
3.3.1 REFNET Joints
For gas and liquid branch pipes:
Make sure that all branch pipes are fitted so that they branch either horizontally or vertically.
When the size of the selected field piping is different from that of the branch pipe, the connecting section should be
cut with a pipe cutter as shown in the figure below.
When cutting an inlet or outlet pipe with a pipe cutter, make sure that you make the cut in the center of the
connection area.
You must insulate branch pipes in accordance with the instructions in the accompanying handbook.
3.3.2 REFNET Header

REFNET Pipe System EDUS39-605
8 Installation of Outdoor Units
Fit cap pipes to the surplus branches if the number of indoor units to be connected is less than the number of branch
pipes available.
When the size of the selected field piping is different from that of branch pipe cut the connecting section with a pipe
cutter as shown in the following figure:
When field piping is connected to the B section of the inlet/outlet pipe on the outdoor unit side of the liquid pipe
header,cut the B section with a pipe cutter and connect it to the A section.

Connect the flared section of the field pipe to the B section as shown in the following figure:
Fit the branch pipe so that the branch lies in a horizontal plane.
The branch pipe must be insulated in accordance with the instruction manual provided with each kit.
1. Use the insulator included in the kit to insulate the header.
2. Use tape included in the kit to seal supplied insulator joints along with those already applied to the field piping.
3. Any cap pipes must also be insulated and taped as described above.

EDUS39-605 REFNET Pipe System
Installation of Outdoor Units 9
4. REFNET Pipe System
4.1 REFNET Joint (Branch Kit)
KHRP26M22T
KHRP26M33T
KHRP26M72TU
Gas Side
Insulation Insulation
(unit:in)
Liquid Side
D3K03622C
1/2
4
3/4
5/8
1/2
7/8
3/4
5/8
5/8
1/2
5/8 3/4
3
1-1/2
15
13-1/3
33
3/8 3/8
1/4
3/8
1/4
1-1/2
9-7/8
11-1/2
Gas Side
Insulation Insulation
Liquid Side
D3K03623A
7/8
3/4
3/4
5/8
3
44
17/8 3/4 7/8
5/8
1/2
1-1/2
12-11/16
14-1/4
1/2
3/8
3
3/8
3/8
1/4
1/4
10-1/4
11-13/16
1-1/2
Liquid Side
Gas Side
Insulation Insulation
D3K04887A