Daikin VRV 5-S Series Installation And Operation Manual page 26

13 Piping installation
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
0≤x≤182
Example: Downstream capacity for B-1 = capacity index of unit 3-1
+ capacity index of unit 3-2
C: Piping between refrigerant branch kit and
indoor unit
Use the same diameters as the connections (liquid, gas) on the
indoor units. The diameters of the indoor units are as follows:
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
10~32
40~80
100~140
13.1.4 To select refrigerant branch kits
For piping example, refer to "13.1.3 To select the piping
Refnet joint at first branch (counting from outdoor unit)
When using refnet joints at the first branch counted from the outdoor
unit side, choose from the following table in accordance with the
capacity of the outdoor unit. Example: Refnet joint A→B‑1.
Outdoor unit capacity type
(HP)
4~6
Refnet joints at other branches
For refnet joints other than the first branch, select the proper branch
kit model based on the total capacity index of all indoor units
connected after the refrigerant branch. Example: Refnet joint
B‑1→C‑1.
Indoor unit capacity index
<182
Refnet headers
Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units connected
below the refnet header.
Indoor unit capacity index
<182
INFORMATION
Maximum 8 branches can be connected to a header.
13.2 Connecting the refrigerant piping
DANGER: RISK OF BURNING
13.2.1 To remove the spun pipes
WARNING
Any gas or oil remaining inside the stop valve may blow off
the spun piping.
If these instructions are NOT followed correctly it may
result in property damage or personal injury, which may be
serious depending on the circumstances.
Use the following procedure to remove the spun piping:
1 Make sure that the stop valves are fully closed.
Installation and operation manual
26
Liquid pipe
15.9 9.5
Liquid pipe
9.5 6.4
12.7 6.4
15.9 9.5
size" [ 4 25].
Refrigerant branch kit
KHRQ22M20T
Refrigerant branch kit
KHRQ22M20T
Refrigerant branch kit
KHRQ22M29H
2 Connect the vacuuming/recovery unit through a manifold to the
service port of all stop valves.
a a
b
b
a Service port
b Stop valve
3 Recover gas and oil from the spun piping by using a recovery
unit.
CAUTION
Do not vent gases into the atmosphere.
4 When all gas and oil is recovered from the spun piping,
disconnect the charge hose and close the service ports.
5 Cut off the lower part of the gas and liquid stop valve pipes
along the black line. Use an appropriate tool (e.g. a pipe cutter).
WARNING
Never remove the spun piping by brazing.
Any gas or oil remaining inside the stop valve may blow off
the spun piping.
6 Wait until all oil has dripped out before continuing with the
connection of the field piping in case the recovery was not
complete.
13.2.2 To connect the refrigerant piping to the
outdoor unit
▪ Piping length. Keep field piping as short as possible.
▪ Piping protection. Protect the field piping against physical
damage.
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600329-1A – 2020.01