Requirements In Case Of Fxtq Indoor Units - Daikin VRV IV RYYQ10T7Y1B Series Installation And Operation Manual

Outdoor unit capacity type
(HP)
8~10
12~22
24~54
▪ 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
The RYYQ22~54 models, consisting of two or three RYMQ modules,
require a 3-pipe system. There is an additional equalising pipe for
such modules (in addition to the conventional gas and liquid piping).
This equalising pipe does not exist for RYYQ8~20 or RXYQ8~54
units.
The equalising pipe connections for the different RYMQ modules are
mentioned in below table.
RYMQ Equalising pipe Ø (mm)
8
10~16
18~20
Deciding the equalising pipe diameter:
▪ In case of 3 multi units: the connection diameter of outdoor to T-
joint has to be kept.
▪ In case of 2 multi units: the connection pipe has to have the
largest diameter.
There is never a connection of the equalising pipe with the indoor
units.
Example: (free multi combination)
RYMQ8+RYMQ12+RYMQ18.
(RYMQ18); Ø22.2 (RYMQ12) and Ø19.1 (RYMQ8). In figure below
only equalising pipe is shown.
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1C – 2016.07
2 pipes
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M20T
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M29H
(a)
KHRQ22M64H
KHRQ22M75H
Branch kit name
BHFQ22P1007
BHFQ22P1517
19.1
22.2
28.6
Largest connection is Ø28.6
Ø22.2 mm
Ø28.6 mm
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
4.2.4 Requirements in case of FXTQ indoor
units
When using FXTQ indoor units, the following requirements apply.
Possible combinations
FXTQ indoor units cannot be combined with any other indoor type
compatible with the outdoor unit. Only the following outdoor-indoor
unit combinations are allowed:
Outdoor unit FXTQ50
RYYQ8/RXYQ8 4× O
RYYQ10/RXYQ10 —
RYYQ12/RXYQ12 —
RYYQ14/RXYQ14 —
RYYQ16/RXYQ16 —
System layout (2 possibilities)
1.
C
B
1
a2
2
A
a1
3
a2
4
1
8 HP FXTQ50 FXTQ50
10 HP FXTQ63 FXTQ63
12 HP FXTQ80 FXTQ80
14 HP FXTQ100 FXTQ80 FXTQ100 FXTQ80
16 HP FXTQ100 FXTQ100 FXTQ100 FXTQ100
A Piping between outdoor unit and first refrigerant branch kit
B Piping between refrigerant branch kits
C Piping between refrigerant branch kit and indoor units
a1, a2 Refnet joints
b Refnet header
Refrigerant piping length and height difference
The piping lengths and height differences must comply with the
following requirements.
Maximum piping lengths
1 Longest pipe (actual)
2 After first branch
3 Total piping length
Maximum height differences
1 Indoor-Outdoor (outdoor lowest)
2 Outdoor-Indoor (outdoor highest)
3 Indoor-Indoor
4 Preparation
Ø19.1 mm
FXTQ63 FXTQ80 FXTQ100
— — —
4× O — —
— 4× O —
— 2× O 2× O
— — 4× O
2.
A
2 3
C
1
2 3 4
FXTQ50 FXTQ50
FXTQ63 FXTQ63
FXTQ80 FXTQ80
≤120 m
≤40 m
≤300 m
≤40 m
≤50 m
≤15 m
Installation and operation manual
b
4
9