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

18.1.5 About the piping length

RXYQQ8~20U7Y1B
VRV IV Q+ series heat pump
4P546229-1A – 2020.10
Indoor unit capacity index
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 (required if the outdoor
unit capacity is 22 HP or more). 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.
Definitions
Term
Actual piping length
Equivalent piping length
Total piping length
H1
H2
Pipe length between outdoor
(b)
Pipe length between outdoor
Total piping length from the outdoor
units.
Difference in height between outdoor and indoor
units.
Difference in height between indoor and indoor
units.
18 Piping installation
|
2 pipes
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M29H
(a)
KHRQ22M64H
KHRQ22M75H
Branch kit name
BHFQ22P1007
BHFQ22P1517
Definition
(a)
and indoor units.
(a)
and indoor units.
(a)
to all indoor
Installer and user reference guide
75