Example Of Connection - Daikin RXYSQ4-5-6PA7V1B Service Manual

SiBE34-802

4. Example of Connection

Example of connection

(Connection of 8 indoor units Heat pump system)
indoor unit
refnet joint
refnet header
Actual pipe length
Maximum
Between outdoor and
allowable
Equivalent length
indoor units
length
Total extension
length
Between outdoor and Difference in
indoor units height
Allowable
height
Between indoor and indoor Difference in
units height
Allowable length after the branch Actual pipe length
Refrigerant branch kit selection
Refrigerant branch kits can only be used with R-410A.
Pipe size selection
Caution on selecting connection pipes
If the overall equivalent piping length is 90 m, be sure to
enlarge the pipe diameter of the gas-side main piping. If the
recommended pipe size is not available, stick to the original
pipe diameter (which may result in a small capacity decrease).
[Gas side]
RXYSQ4+5: Ø15.9 → Ø19.1
RXYSQ6: Ø19.1 → Ø22.2
Main pipe
First refrigerant
(enlarge)
branch kit
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
Appendix
Branch with refnet joint
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
Pipe length between outdoor and indoor units 150 m
[Example] unit 8: a+b+c+d+e+f+g+p 150 m
Equivalent pipe length between outdoor and indoor units 175 m (Assume equivalent pipe length of refnet joint to be 0.5 m and of the refnet header to be 1.0 m. (for calculation purposes))
Total piping length from outdoor unit to all indoor units between 10 m and 300 m
Difference in height between outdoor and indoor units (H1) 50 m ( 40 m if outdoor unit is located in a lower position).
Difference in height between adjacent indoor units (H2) 15 m
Pipe length from rst refr igerant branch kit (either refnet joint or refnet header) to indoor unit 40 m
[Example] unit 8: b+c+d+e+f+g+p 40 m
Use the following refnet joint
Outdoor unit capacity type
RXYSQ4~6
A. Piping between outdoor unit and refrigerant branch kit
• Match to the size of the connection piping on the outdoor unit.
Outdoor unit connection piping size
Piping size (outer diameter x minimum
thickness)
Outdoor unit
capacity type Gas pipe
RXYSQ4+5 Ø15.9x1.0
(Ø19.1x1.0)
RXYSQ6 Ø19.1x1.0
(Ø22.2x1.0)
Indoor
unit
( ) (
Total length (m) of liquid
R= x0.054+
piping size at Ø9.5
Branch with refnet joint and refnet header
a
A
b
H1
H1
p
c d e
7 H2
1 2 3
8
[Example] unit 6: a+b+h 150 m, unit 8: a+i+k 150 m
[Example] unit 6: b+h 40 m, unit 8: i+k 40 m
Refrigerant branch kit name
KHRQ22M20T
B. Piping between refrigerant branch kits
• Use the pipe size from the following table.
Piping size (outer diameter x minimum thickness)
Gas pipe
Ø15.9x1.0
Liquid pipe
Ø9.5x0.8
Example for refrigerant branch using refnet joint and refnet header
)
Total length (m) of liquid
x0.022 a: Ø9.5x30 m
piping size at Ø6.4
b: Ø9.5x10 m
c: Ø9.5x10 m
R=[73 x 0.054] + [69 x 0.022] = 5.46
Branch with refnet header
i
a
B
k
j
7 8
H2
b
g
f h
1
4 5 6
[Example] unit 8: a+i 150 m
[Example] unit 8: i 40 m
Use the following refnet header
Outdoor unit capacity type Refrigerant branch kit name
RXYSQ4~6 KHRQ22M29H
C. Piping between refrigerant branch kit and indoor unit
• Pipe size for direct connection to indoor unit must be the same as the
connection size of indoor unit.
Liquid pipe
Indoor capacity
Ø9.5x0.8
index
20+25+32+40+50
63+80+100+125
d: Ø9.5x13 m g: Ø6.4x10 m j: Ø6.4x10 m
e: Ø6.4x10 m h: Ø6.4x20 m k: Ø6.4x9 m
f: Ø6.4x10 m i: Ø9.5x10 m
5.5 kg
Example of Connection
H1
g
c d e f h i
2 3 4 5 6 7
H2
8
Piping size
(outer diameter x minimum thickness)
Gas pipe Liquid pipe
Ø12.7x0.8 Ø6.4x0.8
Ø15.9x1.0 Ø9.5x0.8
249