To Select Refrigerant Branch Kits - Daikin VRV 5-S User Reference Manual

18 | Piping installation

18.1.5 To select refrigerant branch kits

Installer and user reference guide
90
If a size-up of the piping is required, refer to the table below:
HP class
8~10
12
(a)
If the size-up size of 25.4 mm is NOT available, you must use the standard size. It is not
allowed to size-up to 28.6 mm due to legal requirements.
▪ 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 changeover from inch to mm pipes (field
supply).
- The additional refrigerant calculation has to be adjusted as mentioned in
"19.4 To determine the additional refrigerant
▪ Size-up of both main pipes is required when the equivalent pipe length between
outdoor and indoor units is 90 m or more.
Refrigerant refnets
For piping example, refer to
▪ 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 c).
HP class
8~12
▪ 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.
Indoor unit capacity index
<200
200≤x<290
290≤x<390
▪ 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
<290
Size up – outer diameter [mm]
Gas piping
19.1 → 22.2
(a)
22.2 → 25.4
"18.1.4 To select the piping
Liquid piping
9.5 → 12.7
12.7 → 15.9
4
amount" [ 110].
4
size" [ 88].
Refrigerant branch kit
KHRQ22M29T9 (inch)
KHRQM22M29T (mm)
Refrigerant branch kit
KHRQ22M20TA (inch)
KHRQM22M20T (mm)
KHRQ22M29T9 (inch)
KHRQM22M29T (mm)
KHRA22M65T (inch)
KHRAM22M65T (mm)
Refrigerant branch kit
KHRQ22M29H (inch)
KHRQM22M29H9 (mm)
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02