To Select Refrigerant Branch Kits; About The Piping Length - Daikin RWEYQ8T9Y1B Installer And User Manual

Size up
HP class Liquid piping outer diameter size (mm)
18~22
24
26~34
36~42
F: Piping between refrigerant branch kit and BP
unit
Heat pump mode in case of single outdoor unit
Pipe size for direct connection on BP unit must be based on the total
capacity of the connected indoor units (only in case RA DX indoor
units are connected).
Total capacity index Piping outer diameter size (mm)
of connected indoor
Gas pipe
units
20~62
63~149
150~208
Example:
Downstream capacity for F=[capacity index of unit 4]+[capacity index
of unit 5]
G: Piping between BP unit and RA DX indoor unit
Heat pump mode in case of single outdoor unit
Only in case RA DX indoor units are connected.
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
20, 25, 30
50
60
71
5.3.3

To select refrigerant branch kits

Refrigerant refnets
For piping example, refer to "5.3.2 To select the piping size" on
page 13.
▪ 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 2 pipes
capacity type (HP)
8~10 KHRQ22M29T9
12~22 KHRQ22M64T
24~42 KHRQ22M75T
▪ 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 2 pipes
index
<200 KHRQ22M20T
200≤x<290 KHRQ22M29T9
290≤x<640 KHRQ22M64T
≥640 KHRQ22M75T
RWEYQ8~14T9V1B + RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1 – 2017.04
15.9 → 19.1
19.1 → 22.2
Liquid pipe
12.7 6.4
15.9 9.5
19.1
Liquid pipe
9.5 6.4
12.7
9.5
15.9
3 pipes
KHRQ23M29T9
KHRQ23M64T
KHRQ23M75T
3 pipes
KHRQ23M20T
KHRQ23M29T9
KHRQ23M64T
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 2 pipes
index
<200 KHRQ22M29H
200≤x<290
290≤x<640 KHRQ22M64H
≥640 KHRQ22M75H
(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.
5.3.4

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.
Definitions
Term
Actual piping length Pipe length between outdoor
units
Equivalent piping Pipe length between outdoor
length units, including the equivalent length of the
piping accessories
Total piping length Total piping length, from the outdoor to all
indoor units
(a) If the system is a multi outdoor installation, re-read "the first
outdoor unit branch as seen from the indoor unit".
Equivalent length of the piping accessories
Accessory
Refnet joint
Refnet header
Single BS1Q100~160
Single BS1Q25
Multi BS4~16Q14
Allowable height difference
Term Definition
Actual piping length Pipe length between
(a)
outdoor and indoor units
Equivalent piping Pipe length between
(b) (a)
length outdoor and indoor units
Total piping length Total piping length from the
(a)
outdoor to all indoor units
5 Preparation
3 pipes
KHRQ23M29H
(a) (a)
KHRQ23M64H
KHRQ23M75H
Branch kit name
BHFQ22P1007
BHFQ22P1517
Definition
(a)
and indoor
(a)
and indoor
Equivalent length
0.5 m
1 m
4 m
6 m
4 m
Distance
165 m
190 m
300 m
Installer and user reference guide
15