Daikin VRV II RXYQ8MY1K Service Manual page 287

Selection of Pipe Size, Joints and Header
∗Note 1
When overall equivalent pipe length is 90 m or more, the size of the main gas and liquid pipes (Outdoor unit-first branch kit) must be increased.
n
Diameter of above case
Model Gas Liquid
φ22.2 φ12.7
RXYQ8MY1K(E), YLK(E)
φ25.4 φ12.7
RXYQ10MY1K(E), YLK(E)
φ31.8 φ15.9
RXYQ16MY1K(E), YLK (E)
∗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)
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]
276
Model Gas Liquid
φ31.8 φ19.1
RXYQ18MY1K(E), YLK(E)
φ31.8 φ19.1
RXYQ20MY1K(E), YLK(E)
Not
φ19.1
RXYQ24MY1K(E), YLK(E)
Increased
Example Drawings
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 ≤ 510 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
Model Gas Liquid
φ38.1* φ22.2
RXYQ26MY1K(E), YLK(E)
φ38.1* φ22.2
RXYQ28MY1K(E), YLK(E)
φ38.1* φ22.2
RXYQ30MY1K(E), YLK(E)
Increase the pipe size as follows
φ 6.4 → φ 9.5 φ12.7 → φ15.9
φ 9.5 → φ12.7 φ15.9 → φ19.1
Outdoor unit
a b c
A B
h i
1 2
If available on the site, use this size.
*
Otherwise it can not be increased.
φ19.1 → φ22.2 φ34.9 → φ38.1
φ28.6 → φ31.8
REFNET joint (A-G)
g
d e f
C D E F G
j k l m n
3 4 5 6 7
8
Indoor units (1-8)
Si39-502A
H1
P
Appendix