Daikin RTSQ20PY1 Service Manual page 416

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
R-410A.
• When multi outdoor system are installed, be
sure to use the special separately sold
Outdoor unit multi connection piping kit.
(BHFP30A56).
(For how to select the proper kit, follow the
table at right.)
Example for indoor units connected
downstream
Pipe size selection
The thickness of the pipes in the table shows
the requirements of Japanese High Pressure
Gas Control low. (As of Jan. 2003)
The thickness and material shall be selected
in accordance with local code.
<In case of single outdoor unit system>
Outdoor unit
Function unit
Piping between outdoor unit and
refrigerant branch kit (part A)
<In case of multi outdoor unit system>
Outdoor unit
Function unit
Piping between
outdoor unit (*2) and
refrigerant branch kit
(part A)
Piping between outdoor unit and
outdoor unit multi connection
piping kit (part B)
Equalizer pipe (part C)
405
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 system capacity
type. (Example : REFNET joint A)
Outdoor system capacity type Refrigerant branch kit name
10HP type
14~20HP type
• 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.
Indoor unit total capacity index Refrigerant branch kit name
x < 200
200 ≤ x < 290
290 ≤ x < 640
Example REFNET joint C : Indoor units 3 + 4 + 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 size (O. D.)
Outdoor system
capacity type
Gas pipe
φ 22.2
10HP type
14,16HP type
φ 28.6
20HP type
Piping between outdoor unit multi connection piping kit and outdoor unit (part B)
• Choose from the following table in accordance with the capacity type of the
outdoor unit connected.
Piping size (O. D.)
Outdoor unit
capacity type
Gas pipe
φ 22.2
RTSP8 type
φ 28.6
RTSP12 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.)
φ 6.4 φ 9.5 φ 12.7 φ 15.9 φ 19.1 φ 22.2 φ 25.4 φ 28.6 φ 31.8 φ 34.9 φ 38.1 φ 41.3
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.
• 250 type indoor unit can not be connected below the REFNET header.
Indoor unit total capacity index
KHRP26A33T x < 200
200 ≤ x < 290
KHRP26A72T
290 ≤ x < 640
How to select the outdoor unit multi connection piping kit
(This is required when the system is multi outdoor unit system.)
• Choose from the following table in accordance with the number of outdoor units.
KHRP26A22T
Number of outdoor unit
KHRP26A33T
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
• Choose from the following table in accordance with the total capacity type of all
(unit : mm) the indoor units connected downstream.
• Do not let the connection piping exceed the main refrigerant piping size (Part A).
If the piping size selected from the following table exceeds the piping size of part
Liquid pipe A, decide the piping size in either of the following methods.
(1) Reduce the size of the connection piping to the piping size of part A.
φ 9.5
(2) Replace the piping of part A with piping that is a size larger (see the table in
φ 12.7
Note 1) so that it will be the same as the size of the connection piping.
φ 15.9
Indoor capacity index
(unit : mm)
x < 150
150 ≤ x < 200
Liquid pipe
200 ≤ x < 290
φ 9.5
290 ≤ x < 420
φ 12.7
420 ≤ x < 640
Piping between refrigerant branch kit, and indoor unit
• Match to the size of the connection piping on the indoor unit.
Indoor unit capacity type
20 · 25 · 32 · 40 · 50 type
63 · 80 · 100 · 125 type
200 type
250 type
Equalizer pipe (part D) (multi outdoor unit system only)
Piping size (O. D.)
1/2H type
0.80 0.80 0.88 0.99 1.10 1.21 1.32
Refrigerant branch kit name
KHRP26M22H or KHRP26A33H
KHRP26M33H
KHRP26M72H
640 ≤ x
KHRP26M73H + KHRP26M73HP
Connecting piping kit name
2 units BHFP30AP56
Example REFNET header :
Indoor units 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8
Piping size (O. D.)
Gas pipe
φ 15.9
φ 19.1
φ 22.2
φ 28.6
Piping size (O. D.)
Gas pipe
φ 12.7
φ 15.9
φ 19.1
φ 22.2
φ 19.1
1.43
SiBE31-801_C
(unit : mm)
Liquid pipe
φ 9.5
φ 12.7
φ 15.9
(unit : mm)
Liquid pipe
φ 6.4
φ 9.5
(unit : mm)
Appendix