Refrigerant Pipe Selection - Daikin RXYSQ-P8Y1 Technical Data Manual

11 Installation

11 - 2 Refrigerant Pipe Selection

1 2
3
RXYSQ-P8Y1B
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 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))
indoor units
length
Total extension
length
Between outdoor and Difference in
indoor units height
Allowable
height
Between indoor and Difference in
indoor units height
Actual pipe
h
Allowable length after the branc
length
Refrigerant branch kit selection
Refrigerant branch kits can only be used with R410A.
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
1 2
3
1 Main pipe (enlarge)
2 First refrigerant branch kit
3 Indoor unit
How to calculate the additional refrigerant to be charged
Additional refrigerant to be charged R (kg)
R should be rounded o in units of 0.1 kg
• Outdoor Unit • VRVIII-S heat pump • RXYSQ-P8Y1
a b c d e f g
H1
A B C D E F G
p
h i j k l m n
1 2 3 4 5 6 7 H2
8
Branch with refnet joint
g
a b c d e f
H1
A B C D E F G
p
h i j k l m n
1 2 3 4 5 6 7 H2
8
Pipe length between outdoor and indoor units 150 m
[Example] unit 8: a+b+c+d+e+f+g+p 150 m
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 first refrigerant 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 Refrigerant branch kit name
RXYSQ4~6 KHRQ22M20T
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
Gas pipe Liquid pipe
capacity type
RXYSQ4+5 Ø15.9x1.0
(Ø19.1x1.0)
Ø9.5x0.8
RXYSQ6 Ø19.1x1.0
(Ø22.2x1.0)
Total length (m) of liquid Total length (m) of liquid
R= x0.054+
piping size at Ø9.5 ) piping size at Ø6.4 )
• VRV Systems • Outdoor Unit
i
a
A B
k
b
j
H1 7 8
H2
g
c d e f h
1 2 3 4 5 6
Branch with refnet joint and refnet header
i
a
A B
k
b
j
H1
7 8
H2
g
c d e f h
1 2 3 4 5 6
[Example] unit 6: a+b+h 150m, unit 8: a+i+k 150 m
[Example] unit 6: b+h40 m, unit 8: i+k 40 m
Use the following refnet header
Outdoor unit capacity type
RXYSQ4~6
B. Piping between refrigerant branch kits
• Use the pipe size from the following table.
Piping size (outer diameter x minimum thickness)
Gas pipe Liquid pipe
Ø15.9x1.0 Ø9.5x0.8
Example for refrigerant branch using refnet joint and refnet header
x0.022
a: Ø9.5x3 m d: Ø9.5x13 m g: Ø6.4x10 m
b: Ø9.5x10 m e: Ø6.4x10 m h: Ø6.4x20 m
c: Ø9.5x10 m f: Ø6.4x10 m i: Ø9.5x10 m
R=[73 x 0.054] + [69 x 0.022] = 5.46 5.5 kg
a
H1
b c d e g
f h i
1 2 3 4 5 6 7
H2
8
Branch with refnet header
a
H1
g
b c d e f h i
1 2 3 4 5 6 7
H2
8
[Example] unit 8: a+i 150 m
[Example] unit 8: i 40 m
Refrigerant branch kit name
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.
Piping size (outer diameter x
minimum thickness)
Indoor capacity
Gas pipe Liquid pipe
index
20+25+32+40+50 Ø12.7x08 Ø6.4x0.8
63+80+100+125 Ø15.9x1.0 Ø9.5x0.8
j: Ø6.4x10 m
k: Ø6.4x9 m
4PW66305-1
3
1
11
33