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11
• VRV Systems • Outdoor Unit
33
• Outdoor Unit • VRVIII-S heat pump • RXYSQ-P8Y1
11
Installation
11 - 2 Refrigerant Pipe Selection
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Example of connection
(Connection of 8 indoor units Heat pump system)
indoor unit
refnet joint
refnet header
Branch with refnet joint
Branch with refnet joint and refnet header
Branch with refnet header
Maximum
allowable
length
Between outdoor and
indoor units
Actual pipe
length
Pipe length between outdoor and indoor units
150 m
[Example] unit 8: a+b+c+d+e+f+g+p
150 m
[Example] unit 6: a+b+h
150m, unit 8: a+i+k
150 m
[Example] unit 8: a+i
150 m
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))
Total extension
length
Total piping length from outdoor unit to all indoor units between 10 m and 300 m
Allowable
height
Between outdoor and
indoor units
Difference in
height
Difference in height between outdoor and indoor units (H1)
50 m (
40 m if outdoor unit is located in a lower position).
Between indoor and
indoor units
Difference in
height
Difference in height between adjacent indoor units (H2)
15 m
Allowable length after the branc
h
Actual pipe
length
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
[Example] unit 6: b+h40 m, unit 8: i+k
40 m
[Example] unit 8: i
40 m
Refrigerant branch kit selection
Refrigerant branch kits can only be used with R410A.
Use the following refnet joint
Outdoor unit capacity type
Refrigerant branch kit name
RXYSQ4~6
KHRQ22M20T
Use the following refnet header
Outdoor unit capacity type
Refrigerant branch kit name
RXYSQ4~6
KHRQ22M29H
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]
5:
ĺ
Ø15.9 Ø19.1
RXYSQ6:
ĺ
Ø19.1 Ø22.2
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1 Main pipe (enlarge)
2 First refrigerant branch kit
3 Indoor unit
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
Liquid pipe
5
Ø15.9x1.0
(Ø19.1x1.0)
Ø9.5x0.8
RXYSQ6
Ø19.1x1.0
(Ø22.2x1.0)
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
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
index
Gas pipe
Liquid pipe
20+25+32+40+50
Ø12.7x08
Ø6.4x0.8
63+80+100+125
Ø15.9x1.0
Ø9.5x0.8
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
RXYSQ-P8Y1B
4PW66305-1
Example for refrigerant branch using refnet joint and refnet header
a: Ø9.5x3 m
d: Ø9.5x13 m
g: Ø6.4x10 m
j: Ø6.4x10 m
b: Ø9.5x10 m
e: Ø6.4x10 m
h: Ø6.4x20 m
k: Ø6.4x9 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
R=
x0.054+
x0.022
Total length (m) of liquid
piping size at Ø9.5 )
Total length (m) of liquid
piping size at Ø6.4 )
Summary of Contents for RXYSQ-P8Y1
Page 1: ...Air Conditioning Technical Data VRVIII S heat pump EEDEN13 200_2 RXYSQ P8Y1...
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