About The Piping Length - Daikin VRV IV+ RXYTQ8U5YF Installer And User Manual

17 | Piping installation

17.1.5 About the piping length

Installer and user reference guide
64
Outdoor unit capacity type (HP)
8+10
12~22
24~48
▪ 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 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 to perform the piping installation within the range of the maximum
allowable pipe length, allowable level difference and allowable length after
branching as indicated below.
2 pipes
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M20T
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M29H
(a)
KHRQ22M64H
KHRQ22M75H
Branch kit name
BHFQ22P1007
BHFQ22P1517
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
RXYTQ