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Piping installation
Installer and user reference guide
69
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
Outdoor unit capacity
type (HP)
2 pipes
3 pipes
8+10
KHRQ22M29T9
KHRQ23M29T9
12~22
KHRQ22M64T
KHRQ23M64T
24~42
KHRQ22M75T
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
2 pipes
3 pipes
<200
KHRQ22M20T
KHRQ23M20T
200≤x<290
KHRQ22M29T9
KHRQ23M29T9
290≤x<640
KHRQ22M64T
KHRQ23M64T
≥640
KHRQ22M75T
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
2 pipes
3 pipes
<200
KHRQ22M29H
KHRQ23M29H
200≤x<290
290≤x<640
KHRQ22M64H
(a)
KHRQ23M64H
(a)
≥640
KHRQ22M75H
KHRQ23M75H
(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
Branch kit name
2
BHFQ22P1007
3
BHFQ22P1517
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
18.1.5 About the piping length
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.
