Daikin VRV II RXYQ8MY1K, Service Manual

Page: 287 / 310

Selection of Pipe Size, Joints and Header Si39-502A
276 Appendix
∗
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.
∗
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 " )
n
Diameter of above case
Model
RXYQ8MY1K(E), YLK(E)
RXYQ10MY1K(E), YLK(E)
RXYQ16MY1K(E), YLK (E)
Gas
φ
22.2
φ
25.4
φ
31.8
Liquid
φ
12.7
φ
12.7
φ
15.9
Model
RXYQ18MY1K(E), YLK(E)
RXYQ20MY1K(E), YLK(E)
RXYQ24MY1K(E), YLK(E)
Gas
φ
31.8
φ
31.8
Not
Increased
Liquid
φ
19.1
φ
19.1
φ
19.1
Model
RXYQ26MY1K(E), YLK(E)
RXYQ28MY1K(E), YLK(E)
RXYQ30MY1K(E), YLK(E)
Gas
φ
38.1*
φ
38.1*
φ
38.1*
Liquid
φ
22.2
φ
22.2
φ
22.2
a
A B C D E F G
b c d e f
g
h i j k l m n
1 2 3 4 5 6 7
8
H1
P
Outdoor unit
REFNET joint (A-G)
Indoor units (1-8)
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]
≤
40 m
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
Increase the pipe size as follows
φ
6.4
→ φ
9.5
φ
12.7
→ φ
15.9
φ
19.1
→ φ
22.2
φ
34.9
→ φ
38.1
φ
9.5
→ φ
12.7
φ
15.9
→ φ
19.1
φ
28.6
→ φ
31.8
*
If available on the site, use this size.
Otherwise it can not be increased.