Daikin VRV III REYQ8PY1 Service Manual page 425

Example of Connection (R-410A Type)
Outdoor unit multi connection piping kit and
Refrigerant branch kit selection
• Refrigerant branch kits can only be used with R410A.
• When multi outdoor system are installed, be sure to use the
special separately sold Outdoor unit multi connection piping
kit. (BHFP26P90 · 136).
(For how to select the proper kit, follow the table at right.)
• Never use BHFP26M90 · 135, BHFP22M90 · 135P for M
type of this series or T joint (field supplyed).
Example for indoor units
connected downstream
Pipe size selection
The thickness of the pipes in the table shows
the requirements of Japanease High Pressure
Gas Controll low. (As of Jan. 2003)
The thickness and material shall be selected in
accordance with local code.
For an outdoor unit installation, make
the settings in accordance with the
following figure.
Outdoor unit
Equalizer pipe
(part D)
Piping between outdoor unit
multi connection piping kit
and outdoor unit (part C)
Piping between outdoor unit multi
connection piping kits (part B)
Piping between outdoor unit and
refrigerant branch kit (part A)
414
How to select the REFNET joint
When using REFNET joint at the first branch counted from the outdoor unit side,
choose from the following table in accordance with the outdoor unit capacity type.
(Example : REFNET joint A)
Outdoor unit capacity type
Refrigerant branch kit name
8,10HP type KHRP25A33T
12~22HP type KHRP25A72T+KHRP25M72TP
24HP type ~ KHRP25A73T+KHRP25M73TP
Choose the REFNET joints other than the first branch from the following table in accordance
with the total capacity index of all the indoor units connected below the REFNET joint.
Refrigerant branch kit name
Indoor unit total capacity index
3 pipes
x < 200 KHRP25A22T
200 ≤ x < 290
KHRP25A33T
290 ≤ x < 640
KHRP25A72T+KHRP25M72TP
640 ≤ x
KHRP25A73T+KHRP25M73TP
Example REFNET joint C : Indoor units 5 + 6 + 7 + 8
Piping between outdoor unit (*2) and refrigerant branch kit (part A)
Choose from the following table in accordance with the outdoor unit system capacity type.
Piping between outdoor unit multi connection piping kits (part B)
Choose from the following table in accordance with the total capacity of all
the outdoor units connected upstream.
Piping size (O. D.)
Outdoor unit
Suction gas pipe HP/LP gas pipe
capacity type
φ19.1 φ15.9
8HP type
φ22.2
10HP type
φ19.1
12HP type
14,16HP type
φ28.6 φ22.2
18HP type
20,22HP type
24HP type
φ34.9 φ28.6
26~34HP type
36HP type
φ41.3
φ34.9
38~48HP type
Piping between outdoor unit multi connection piping kit and outdoor unit (part C)
Choose from the following table in accordance with the capacity type of
the outdoor unit connected.
Outdoor unit Piping size (O. D.)
capacity type Suction gas pipe HP/LP gas pipe
φ22.2
8,10HP type
φ19.1
12HP type
φ28.6
φ22.2
14,16HP type
Temper grade and wall thickness for pipes
(Temper grade, O type and 1/2H type indicate the material type specified in JIS H 3300.)
φ6.4 φ9.5 φ12.7 φ15.9
Copper tube O. D.
Temper grade O type
Wall thickness
0.80 0.80 0.80 0.99
(Min. requirement)
How to select the REFNET header
Choose from the following table in accordance with the total capacity index of all
the indoor units connected below the REFNET header.
Indoor unit of FXY ~ P280 · 450 · 560 can not be connected below the REFNET header.
Indoor unit total capacity index
x < 200
200 ≤ x < 290
290 ≤ x < 640
640 ≤ x
How to select the outdoor unit multi connection piping kit
(This is required when the system is multi outdoor unit system.)
2 pipes
Choose from the following table in accordance with the number of outdoor units.
KHRP26A22T
KHRP26A33T Number of outdoor unit
KHRP26A72T
Example REFNET joint B : Indoor units 7 + 8
Example REFNET header : Indoor units 1 + 2 + 3 + 4 + 5 + 6
Piping between refrigerant branch kits
Piping between refrigerant branch kit and BS unit
Piping between BS unit and refrigerant branch kit
Choose from the following table in accordance with the total capacity type of all the
(unit : mm)
indoor units connected downstream.
*1 Connection piping must not exceed the refrigerant Piping size between outdoor
Liquid pipe
unit and refrigerant branch kit (part A).
φ9.5
*2 When selecting 2 pipes line (gas pipe and liquid pipe), use Suction gas pipe
column for gas pipe and Liquid pipe column for liquid pipe.
φ12.7
Indoor capacity index
φ15.9 x < 150
150 ≤ x < 200
200 ≤ x < 290
290 ≤ x < 420
φ19.1
420 ≤ x < 640
640 ≤ x < 920
920 ≤ x
Piping between refrigerant branch kit, BS unit and indoor unit
(unit : mm)
Match to the size of the connection piping on the indoor unit.
Liquid pipe
Indoor unit capacity type
φ9.5 × 0.8
20 · 25 · 32 · 40 · 50 type
φ12.7
63 · 80 · 100 · 125 type
200 type
250 type
Equalizer pipe (part D) (outdoor multi system only)
Piping size (O. D.)
φ19.1 φ22.2 φ25.4 φ28.6 φ31.8 φ34.9 φ38.1 φ41.3
1/2H type
0.80 0.80 0.88 0.99 1.10 1.21 1.32 1.43
Refrigerant branch kit name
3 pipes
KHRP26M22H or KHRP26M33H
KHRP25M33H
KHRP26M33H
KHRP25M72H+KHRP25M72HP KHRP26M72H
KHRP25M73H+KHRP25M73HP KHRP26M73H+KHRP26M73HP
Connecting piping kit name
2 units BHFP26P90
3 units BHFP26P136
Example REFNET header :
Indoor units 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8
Piping size (O. D.)
Suction gas pipe HP/LP gas pipe
φ15.9 φ12.7
φ19.1 φ15.9
φ22.2
φ19.1
φ28.6
φ34.9 φ28.6
φ41.3
Piping size (O. D.)
gas pipe
φ12.7
φ15.9
φ19.1
φ22.2
φ19.1
Si37-701
2 pipes
(unit : mm)
Liquid pipe
φ9.5
φ12.7
φ15.9
φ19.1
(unit : mm)
Liquid pipe
φ6.4
φ9.5
(unit : mm)
Appendix