18 | Piping installation
Installer and user reference guide
74
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
18.1.4 To select refrigerant branch kits
Refrigerant refnets
For piping example, refer to "To select the piping size"[471].
▪ 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).
Outdoor unit capacity type (HP) 3 pipes
8+10 KHRQ23M29T9
12~22 KHRQ23M64T
24~54 KHRQ23M75T
▪ For refnet joints other than the first branch (example refnet joint b), 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 3 pipes
<200 KHRQ23M20T
200≤x<290 KHRQ23M29T9
290≤x<640 KHRQ23M64T
≥640 KHRQ23M75T
▪ 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 3 pipes
<200 KHRQ23M29H
200≤x<290
290≤x<640 KHRQ23M64H
(a)
≥640 KHRQ23M75H
(a) If the pipe size above the refnet header is Ø34.9 or more, KHRQ23M75H is required.
INFORMATION
Maximum 8 branches can be connected to a header.
▪ How to choose an outdoor multi connection piping kit. Choose from the
following table in accordance with the number of outdoor units.
Number of outdoor units Branch kit name
2 BHFQ23P907
3 BHFQ23P1357
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
To Next Page
Loading...
