Example Of Connection - Daikin VRVIII-S Service Manual

Example of Connection

4. Example of Connection

Example of connection
(Connection of 8 indoor units
Heat pump system)
Maximum
allowable
Between outdoor and indoor units
length
Allowable
Between outdoor and indoor units
height
Between indoor and indoor units
length
Allowable length after the branch
Refrigerant branch kit selection
Refrigerant branch kits can only be
used with R-410A.
Pipe size selection
Caution on selecting connection pipes
• When the equivalent piping length between the outdoor unit and the indoor unit is
90 m or more, make sure to use a thicker pipe as the main pipe on the gas
side.When the air-conditioning ability is reduced due to the refrigerant piping
distance, a thicker pipe may be used also as the main pipe.
[Gas side]
RXYSQ4,5 type ø15.9
RXYSQ6 type ø19.1
Outdoor unit
Caution) In brazing connection in the size increase area in the piping, use a
different-diameter joint for connection. (The different-diameter joint should be
arranged in the local field.)The connection area is located near the outdoor unit
(usually after the first bending outside the 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 0.1Kg.
222
Actual pipe length
Actual pipe length
Difference in height
Difference in height
Equivalent length
Total extension length
ø 19.1
ø 22.2
The first refrigerant
branching kit
Main pipe
Enlarge
a
A
h
Pipe length between outdoor and indoor un
Example unit 8: a + b + c + d + e + f + g + p ≤ 150m
Equivalent pipe length between outdoor and indoor
Total piping length from outdoor unit to all in
Difference in height between outdoor and in
Difference in height between adjacent indoo
Pipe length from first refrigerant branch kit (
Example unit 8: b + c + d + e + f + g + p ≤ 40m
Use refnet joint from the following table.
Outdoor unit capacity type
RXYSQ4,5, 6 type
Piping between outdoor unit and refrigerant branch kit
• Match to the size of the connection piping on the outdoor un
Outdoor unit connection pipe size
Outdoor unit
capacity type
RXYSQ4,5
RXYSQ6
Indoor unit
Total length (m)
R=
of liquid piping
size at
SiENBE34-703
Branch with refnet joint
REFNET joint (A-G
Outdoor unit
g
b c d e f
B C D E F
i j k l m
1 2 3 4 5 6
Indoor units (1-8)
Piping size
(outer diameter × minimum thickne
Gas pipe
ø 15.9 × 1.0
type
ø 19.1 × 1.0 *
ø 19.1 × 1.0
type
ø 22.2 × 1.0 *
* When the size is lar
Total length (m)
+
of liquid piping
×0.054
ø ø
9.5 size at
Appendix
H1
G
P
n
7 H2
8
Ref
KHRP2
(Unit: m
Liquid pipe
f 9.5 × 0.8
×0.022
6.4