5
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Preparation
Installer and user reference guide
33
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
Pipe Ø (mm)
Minimal thickness t (mm)
6.4/9.5/12.7
0.80
15.9
0.99
19.1/22.2
0.80
28.6
0.99
34.9
1.21
41.3
1.43
▪
In case the required pipe sizes (inch sizes) are not available, it is also allowed to
use other diameters (mm sizes), taken the following into account:
-
Select the pipe size nearest to the required size.
-
Use the suitable adapters for the change-over from inch to mm pipes (field
supply).
-
The additional refrigerant calculation has to be adjusted as mentioned in
"6.7.3 To determine the additional refrigerant amount"
64].
F: Piping between refrigerant branch kit and branch selector box (BP box)
Pipe size for direct connection on branch selector box (BP*) must be based on the
total capacity of the connected indoor units (only in case RA DX indoor units are
connected).
Total capacity index of
connected indoor units
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
20~62
12.7
6.4
63~149
15.9
9.5
150~208
19.1
Example:
Downstream capacity for F=[capacity index of unit 4]+[capacity index of unit 5]
G: Piping between branch selector box (BP box) and RA DX indoor unit
Only in case RA DX indoor units are connected.
Indoor unit capacity index
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
20, 25, 30
9.5
6.4
50
12.7
60
9.5
71
15.9
5.3.3 To select refrigerant branch kits
Refrigerant refnets
"5.3.2 To select the piping size"
▪
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).
Summary of Contents for VRV IV+
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