About The Piping Length - Daikin VRV IV W+ Series Installer And User Reference Manual

18.1.5 About the piping length

RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
Outdoor unit capacity
type (HP)
8+10
12~22
24~42
▪ 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
<200
200≤x<290
290≤x<640
≥640
▪ 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
<200
200≤x<290
290≤x<640
≥640
(a) If the pipe size above the refnet header is Ø34.9 mm or more, KHRQ22M75H 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
2
3
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
Make sure the piping installation does not exceed the maximum allowable pipe
length, the allowable level difference, and the allowable length after branching. To
illustrate the piping length requirements, 6 cases are discussed in the chapters
below. They describe both standard and non-standard outdoor unit combinations.
18
2 pipes
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M20T
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M29H
(a)
KHRQ22M64H
KHRQ22M75H
Branch kit name
BHFQ22P1007
BHFQ22P1517
Piping installation
|
3 pipes
KHRQ23M29T9
KHRQ23M64T
KHRQ23M75T
3 pipes
KHRQ23M20T
KHRQ23M29T9
KHRQ23M64T
KHRQ23M75T
3 pipes
KHRQ23M29H
(a)
KHRQ23M64H
KHRQ23M75H
Installer and user reference guide
69