Daikin REYQ34PY1 [414/438] Indoor units 1 8
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Daikin REYQ34PY1 [414/438] Indoor units 1 8

Daikin REYQ40PY1 [414/438] Indoor units 1 8
Si37-701 Example of Connection (R-410A Type)
Appendix 403
a
Required Conditions Example Drawings
1.
It is necessary to increase the pipe size if the pipe length between
the first branch kit and the final branch kit is over than 40m.
(Reducer must be procured on site.)
If the increased pipe size is larger than main pipe size, then increase
the main (liquid, suction gas) pipe size to the same pipe size.
(It is not necessary to increase the high and low pressure gas pipe.)
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] ≤ 40 m
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
Increase the pipe size as follows
φ 9.5 → φ12.7
φ12.7 → φ15.9
φ15.9 → φ19.1
φ19.1 → φ22.2
φ22.2 → φ25.4*
φ28.6 → φ31.8*
φ34.9 → φ38.1*
a
ABCDEFG
bcdef
g
hi j kl mn
1234567
8
H1
p
Outdoor unit
REFNET joint (A-G)
Indoor units ( 1 - 8 )
*If available on the site, use this size. Otherwise it can not be increased.
How to calculate the
additional refrigerant
to be charged
Additional refrigerant to
be charged : R(kg)
R should be rounded
off in units of 0.1 kg.
R =
Total length(m)
of liquid piping
size at φ22.2
Total length(m)
of liquid piping
size at φ15.9)
Total length(m)
of liquid piping
size at φ9.5
Total length(m)
of liquid piping
size at φ19.1)
Total length(m)
of liquid piping
size at φ12.7
Total length(m)
of liquid piping
size at φ6.4
0.37
0.18
0.059
0.26
0.12
0.022
1.02
Example for refrigerant branch using REFNET joint and REFNET header for the systems and each pipe length as shown below.
Outdoor system : REYQ34PY1
Total capacity of indoor unit : 116%
R =
( 50 × 0.26 + 1 × 0.18 + 3 × 0.12 + 156 × 0.059 + 20 × 0.022 )×1.02 + 3.0 + 0.5
a : φ19.1 × 30m
b : φ19.1 × 20m
c : φ9.5 × 10m
d : φ9.5 × 10m
e : φ9.5 × 10m
f : φ9.5 × 10m
g : φ9.5 × 10m
h : φ9.5 × 10m
i : φ9.5 × 10m
j : φ9.5 × 10m
k : φ9.5 × 20m
l : φ9.5 × 20m
m : φ9.5 × 20m
n : φ9.5 × 10m
o : φ6.4 × 10m
p : φ6.4 × 10m
r : φ12.7 × 3m
s : φ9.5 × 3m
t : φ9.5 × 3m
u : φ15.9 × 1m
a, b u r c~n, s, t o, p
REYQ34PY1 116%
= 27.148 27.1kg
Round off in units of 0.1 kg.
Note 1.
When the equivalent pipe length between outdor and indoor units is 90m or
more, the size of main pipes on the liquid side (refer to figure 9) must be
increased according to the right table.
(Never increase suction gas pipe and HP/LP gas pipe.)
1.Outdoor unit
2.Main pipes
3.Increase only liquid pipe size
4.First refrigerant branch kit
5.BS unit
6.Indoor unit
Note 2. Allowable length after the first refrigerant branch kit to indoor units is 40m or less, however it can be extended up to 90m if all the following conditions are satisfied. (In case of "Branch with REFNET joint")
System
REYQ8 ~ 10PY1
REYQ12 ~ 16PY1
REYQ18 ~ 24PY1
REYQ26 ~ 48PY1
Liquid pipe
φ9.5 → φ12.7
φ12.7 → φ15.9
φ15.9 → φ19.1
φ19.1 → φ22.2
REFRIGERANT AMOUNT
FOR EXCEEDING CONNECTION
CAPACITY OF INDOOR UNIT
INDOOR
CONNECTION
CAPACITY
MORE THAN 100%
120% OR LESS
MORE THAN 120%
130% OR LESS
MODEL NAME
REYQ18
~
32PY1
REYQ34
~
48PY1
0.5kg
0.5kg 1.0kg
HEAT RECOVER SYSTEM
THE AMOUNT OF REFRIGERANT
REYQ8 ~ 16PY1
REYQ18 ~ 20PY1
REYQ22 ~ 24PY1
REYQ26PY1
REYQ28 ~ 30PY1
REYQ32 ~ 40PY1
REYQ42PY1
REYQ44 ~ 46PY1
REYQ48PY1
3.6kg
1.0kg
1.5kg
2.0kg
2.5kg
3.0kg
3.5kg
4.0kg
4.5kg
MODEL NAME
1
2
3
4
56
It is necessary to increase the main pipes of outdoor unit and first refrigerant branch kit
(liquid side) by one size, if the difference in height between outdoor unit and indoor unit is
over than 50m.

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