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Daikin RXYQ5PY1 Service Manual Page 149

R-410a heat pump 50hz/60hz cooling only 50hz.
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SiEN34-705
∗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)
However, the pipes that are same pipe
size with main pipe must not be
increased.
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.
General Information
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 ≤ 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
Increase the pipe size as follows
φ 9.5 → φ12.7
φ15.9 → φ19.1
φ12.7 → φ15.9
φ19.1 → φ22.2
Outdoor unit
a
b
c
d
e
A
B
C
D
h
i
j
k
1
2
3
4
Indoor units ( 1 - 8 )
Appendix
φ22.2 → φ25.4*
φ34.9 → φ38.1*
φ28.6 → φ31.8*
REFNET joint (A-G)
H1
g
f
E
F
G
p
l
m
n
5
6
7
8
143

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