Daikin VRV III REYQ8PY1 Service Manual page 426

Si37-701
a
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.
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.)
Outdoor unit
First refrigerant branch kit
Main pipes
Increase only liquid pipe size
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")
Required Conditions
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]
*If available on the site, use this size. Otherwise it can not be increased.
Appendix
Total length(m)
0.37
R = of liquid piping
size at φ22.2
Total length(m)
0.18
of liquid piping
size at φ15.9)
Total length(m)
0.059
of liquid piping
size at φ9.5
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%
( 50 × 0.26 + 1 × 0.18 + 3 × 0.12 + 156 × 0.059 + 20 × 0.022 )×1.02 + 3.0 + 0.5
R =
a, b u
= 27.148 27.1kg
Round off in units of 0.1 kg.
System
REYQ8 ~ 10PY1
REYQ12 ~ 16PY1
REYQ18 ~ 24PY1
REYQ26 ~ 48PY1
BS Indoor
unit unit
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
Total length(m)
MODEL NAME
0.26
of liquid piping
size at φ19.1)
REYQ8 ~ 16PY1
REYQ18 ~ 20PY1
1.02
REYQ22 ~ 24PY1
Total length(m)
0.12
of liquid piping REYQ26PY1
size at φ12.7
REYQ28 ~ 30PY1
REYQ32 ~ 40PY1
Total length(m)
REYQ42PY1
0.022
of liquid piping
REYQ44 ~ 46PY1
size at φ6.4
REYQ48PY1
a : φ19.1 × 30m e : φ9.5 × 10m
b : φ19.1 × 20m f : φ9.5 × 10m
c : φ9.5 × 10m g : φ9.5 × 10m
d : φ9.5 × 10m h : φ9.5 × 10m
r c~n, s, t o, p REYQ34PY1 116%
It is necessary to increase the main pipes of outdoor unit and first refrigerant branch kit
Liquid pipe
φ9.5 → φ12.7 (liquid side) by one size, if the difference in height between outdoor unit and indoor unit is
over than 50m.
φ12.7 → φ15.9
φ15.9 → φ19.1
φ19.1 → φ22.2
Example Drawings
Increase the pipe size as follows
φ 9.5 → φ12.7
φ12.7 → φ15.9
REFRIGERANT AMOUNT
HEAT RECOVER SYSTEM
FOR EXCEEDING CONNECTION
THE AMOUNT OF REFRIGERANT
CAPACITY OF INDOOR UNIT
3.6kg
1.0kg
INDOOR
1.5kg
CONNECTION
2.0kg
CAPACITY
2.5kg
3.0kg MORE THAN 100%
120% OR LESS
3.5kg
MORE THAN 120%
4.0kg
130% OR LESS
4.5kg
i : φ9.5 × 10m m : φ9.5 × 20m r : φ12.7 × 3m
j : φ9.5 × 10m n : φ9.5 × 10m s : φ9.5 × 3m
k : φ9.5 × 20m o : φ6.4 × 10m t : φ9.5 × 3m
l : φ9.5 × 20m p : φ6.4 × 10m u : φ15.9 × 1m
φ15.9 → φ19.1 φ22.2 → φ25.4*
φ19.1 → φ22.2 φ28.6 → φ31.8*
REFNET joint (A-G)
Outdoor unit
g
a b c d e f
A B C D E F G
h i j k l m n
1 2 3 4 5 6 7
Indoor units ( 1 - 8 )
Example of Connection (R-410A Type)
MODEL NAME
REYQ18 REYQ34
~ ~
32PY1 48PY1
0.5kg
0.5kg 1.0kg
φ34.9 → φ38.1*
H1
p
8
415