Daikin VRV III RXYQ5-54PY1 Service Manual page 375

Example of connection (R-410A Type)
∗Note 1
When the equivalent pipe length between outdoor and indoor units is 90m or more, the size of main pipes (both gas-side and liquid-side) must be increased.
Depending on the length of the piping, the capacity may drop, but even in such case it is able to increase the size of main pipes.
The first refrigerant branch kit
Outdoor unit
Main pipes
Increase
Diameter of above case
Model Gas
φ19.1
RXYQ5 Type
φ22.2
RXYQ8 Type
φ25.4*
RXYQ10 Type
Not
RXYQ12 Type
Increased
Not
RXYQ14 Type
Increased
φ31.8*
RXYQ16 Type
φ31.8*
RXYQ18 Type
∗Note 2
Allowable length after the first refrigerant branch kit to indoor units is 40 m or less, however it can be extended up to 90 m if all the following conditions are satisfied. (In case of " Branch with REFNET joint " )
Required Conditions
1. It is necessary to increase the pipe size between the first branch kit
and the final branch kit. (Reducers must be procured on site)
2. For calculation of Total extension length, the actual length of
above pipes must be doubled. (except main pipe and the pipes
that are not increased)
3. Indoor unit to the nearest branch kit ≤ 40 m
4. The difference between
[Outdoor unit to the farthest indoor unit] and [Outdoor unit
to the nearest indoor unit]
*If available on the site, use this size. Otherwise it can not be increased.
∗Note 3
If the pipe size above the REFNET header is φ34.9 or more, KHRP26M73HP is required.
364
Indoor unit
Liquid Model Gas
Not
φ31.8*
RXYQ20 Type
Increased
φ12.7 φ31.8*
RXYQ22 Type
Not
φ12.7
RXYQ24 Type
Increased
φ15.9 φ38.1*
RXYQ26 Type
φ15.9 φ38.1*
RXYQ28 Type
φ15.9 φ38.1*
RXYQ30 Type
φ19.1 φ38.1*
RXYQ32 Type
8 b + c + d + e + f + g + p ≤ 90 m
increase the pipe size of b, c, d, e, f, g
a + b × 2 + c × 2 + d × 2 + e × 2 + f × 2 + g × 2
+ h + i + j + k + l + m + n + p ≤ 1000 m
h, i, j....... p ≤ 40 m
The farthest indoor unit 8
The nearest indoor unit 1
( a + b + c + d + e + f + g + p ) - ( a + h ) ≤ 40 m
≤ 40 m
Liquid Model Gas
φ19.1 φ38.1*
RXYQ34 Type
Not
φ19.1
RXYQ36 Type
Increased
Not
φ19.1
RXYQ38 Type
Increased
Not
φ22.2
RXYQ40 Type
Increased
Not
φ22.2
RXYQ42 Type
Increased
Not
φ22.2
RXYQ44 Type
Increased
Not
φ22.2
RXYQ46 Type
Increased
Example Drawings
Increase the pipe size as follows
φ 9.5 → φ12.7
φ12.7 → φ15.9
Liquid Model Gas
Not
φ22.2
RXYQ48 Type
Increased
Not
φ22.2
RXYQ50 Type
Increased
Not
φ22.2
RXYQ52 Type
Increased
Not
φ22.2
RXYQ54 Type
Increased
φ22.2
*If available on the site, use this size.
Otherwise, it can not be increased.
φ22.2
φ22.2
φ15.9 → φ19.1 φ22.2 → φ25.4* φ34.9 → φ38.1*
φ19.1 → φ22.2 φ28.6 → φ31.8*
REFNET joint (A-G)
Outdoor unit
H1
g
a b c d e f
A B C D E F G
p
h i j k l m n
1 2 3 4 5 6 7
8
Indoor units ( 1 - 8 )
Si34-601A
Liquid
φ22.2
φ22.2
φ22.2
φ22.2
Appendix