Installation manual

RXYSQ4~6M7V3B
VRVII-S system air conditioner
4PW17806-1C
Installation manual
9
Example of connection (Connection of 8 indoor units Heat pump system)
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≤150 m, 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 branch 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+h≤40 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 R-410A.
Use the following refnet joint Use the following refnet header
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
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
B. Piping between refrigerant branch kits
• Use the pipe size from the following table.
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.
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
indoor unit refnet joint refnet header
ab c d e f
g
hi j kl mn
1234567
8
H2
H1
p
ABCDEFG
H1
H2
a
i
b
cde f
g
h
123456
k
j
78
A
B
a
H1
H2
cde
f
g
hi
b
1234567
8
Outdoor unit capacity type Refrigerant branch kit name RXYSQ4~6 KHRQ22M20T
Outdoor unit capacity type Refrigerant branch kit name RXYSQ4~6 KHRQ22M29H
1 2
3
1 Main pipe (enlarge) 2 First refrigerant branch kit 3 Indoor unit
Outdoor unit capacity type
Piping size (outer diameter x minimum
thickness)
Gas pipe Liquid pipe
RXYSQ4+5 Ø15.9x1.0
(Ø19.1x1.0)
Ø9.5x0.8
RXYSQ6 Ø19.1x1.0
(Ø22.2x1.0)
Piping size (outer diameter x minimum thickness)
Gas pipe Liquid pipe
Ø15.9x1.0 Ø9.5x0.8
Indoor capacity index
Piping size
(outer diameter x minimum thickness)
Gas pipe Liquid pipe
20+25+32+40+50 Ø12.7x0.8 Ø6.4x0.8 63+80+100+125 Ø15.9x1.0 Ø9.5x0.8
R=
(
Total length (m) of liquid
piping size at Ø9.5
)
x0.054+
(
Total length (m) of liquid
piping size at Ø6.4
)
x0.022
Example for refrigerant branch using refnet joint and refnet header R=[73 x 0.054] + [69 x 0.022] = 5.46 ⇒ 5.5 kg
a: Ø9.5x30 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