Daikin RTSQ20PY1 Service Manual page 417

SiBE31-801_C
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 outdoor
(*2) and indoor units is 90m or more, the size of
main pipes (figure on right) must be increased
according to the right table.
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.
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 40m. (Reducers must be
procured on site)
If the increased pipe size is larger than main pipe size, then increase
the main pipe size to the same pipe size.
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) Total length(m)
0.37
R = of liquid piping of liquid piping
size at φ22.2 size at φ19.1
Total length(m) Total length(m)
0.18
of liquid piping of liquid piping
size at φ15.9 size at φ12.7
Total length(m) Total length(m)
0.059
of liquid piping of liquid piping
size at φ9.5 size at φ6.4
Example for refrigerant branch using REFNET joint and REFNET header for the systems and each pipe length as shown below.
System : RTSYQ20PY1
Independent outdoor unit : RTSQ8PY1, RTSQ12PY1
Function unit : BTSQ20PY1
System Gas Liquid
RTSYQ10 type φ 22.2 → φ 25.4 (*) φ 9.5 → φ 12.7
RTSYQ14 type Not Increased
φ 12.7 → φ 15.9
RTSYQ16 type
φ 28.6 → φ 31.8 (*)
φ 15.9 → φ 19.1
RTSYQ20 type
(*) If available on the site, use this size.
Otherwise, it can not be increased.
Example Drawings (In case of "Branch with REFNET joint")
8 c + d + e + f + g + h + q ≤ 90 m
increase the pipe size of c, d, e, f, g, h
a + b + c × 2 + d × 2 + e × 2 + f × 2 + g × 2
+ h × 2 + i + j + k + r + m + n + p + q ≤ 500 m
i, j....... p, q ≤ 40 m
The farthest indoor unit 8
The nearest indoor unit 1
≤ 40 m (a + b + c + d + e + f + g + h + q) - (a + b + i ) ≤ 40 m
FOR THE SYSTEM
0.26
SYSTEM NAME THE AMOUNT OF REFRIGERANT
RTSYQ10PY1 —
0.12
RTSYQ14PY1 1.3kg
RTSYQ16PY1 2.3kg
0.022
RTSYQ20PY1 —
a : φ 15.9 × 10m e : φ 6.4 × 10m i : φ 6.4 × 10m r : φ 12.7 × 5m
b : φ 15.9 × 30m f : φ 6.4 × 20m j : φ 9.5 × 20m s : φ 9.5 × 10m
c : φ 12.7 × 20m g : φ 6.4 × 20m k : φ 9.5 × 10m
d : φ 6.4 × 10m h : φ 6.4 × 10m r : φ 9.5 × 10m
R = 40 × 0.18 + 25 × 0.12 + 50 × 0.059 + 80 × 0.022 = 14.91
a, b c, r j, k,r, s
Outdoor unit
Function unit First refrigerant
branch kit
Indoor
unit
Main pipes
Increase gas and liquid
pipe size both.
In case of single outdoor unit system
Increase the pipe size as follows
φ 9.5 → φ 12.7
φ 12.7 → φ 15.9
Outdoor unit
Example of Connection (R-410A Type)
14.9kg
Round off in units of 0.1 kg.
d~i
Outdoor unit
First refrigerant
Function unit
branch kit
Main pipes
Increase gas and liquid
pipe size both.
In case of multi outdoor unit system
φ 15.9 → φ 19.1 φ 22.2 → φ 25.4* φ 34.9 → φ 38.1*
φ 19.1 → φ 22.2 φ 28.6 → φ 31.8*
Function unit REFNET joint
(A~G)
a
b c d e f g h
A B C D E F G
r
i j k m n p
1 2 3 4 5 6
Indoor units ( 1 - 8 )
Indoor
unit
q
7
8
406