Daikin VRV IV RKXYQ5T8Y1B Series Installation And Operation Manual page 20

14 Piping installation
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
63~140
200
250
14.1.4 To select refrigerant branch kits
For piping example, refer to "To select the piping
Refnet joint at first branch (counting from the compressor unit)
When using refnet joints at the first branch counted from the
compressor unit side, choose from the following table in accordance
with the capacity of the compressor unit. Example: Refnet joint c
(B→C/D).
Compressor unit capacity type
5 HP
8 HP
Refnet joints at other branches
For refnet joints other than the first branch, select the proper branch
kit model based on the total capacity index of all indoor units
connected after the refrigerant branch. Example: Refnet joint c
(C→D/D).
Indoor unit capacity index
<200
200≤x<260
Refnet headers
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
<260
INFORMATION
Maximum 8 branches can be connected to a header.
14.1.5 Refrigerant piping length and height
difference
The piping lengths and height differences must comply with the
following requirements.
c
a
H1
H2
EKEXV
L1 L2
b
H4
H3
a Heat exchanger unit
b Compressor unit
c Refrigerant branch kit
VRV DX VRV DX indoor unit
EKEXV Expansion valve kit
AHU Air handling unit
H1~H5 Height differences
L1~L7 Piping lengths
Minimum and maximum piping lengths
1 Heat exchanger unit →
Compressor unit
Installation and operation manual
20
Liquid pipe
15.9 9.5
19.1
22.2
size" [ 4 19].
Refrigerant branch kit
KHRQ22M20T
KHRQ22M29T9
Refrigerant branch kit
KHRQ22M20T
KHRQ22M29T9
Refrigerant branch kit
KHRQ22M29H
L7
L5
c
L6
L3
VRV DX
L4
H5
AHU
VRV DX
L1≤30 m
2 Actual piping length (equivalent
(a)
piping length)
3 Total piping length (x=L1+L2+L3+L4+L5+L6+L7)
Minimum
Maximum in case of
8 HP
Maximum in case of
5 HP
4 EKEXV → AHU
5 First branch kit → Indoor unit/
AHU
(b)
Maximum height differences
1 Heat exchanger unit ↔
Compressor unit
2 Compressor unit ↔ Indoor unit H2≤30 m
3 EKEXV ↔ AHU
4 Indoor unit ↔ Indoor unit
(a) Assume equivalent piping length of refnet joint=0.5 m and
refnet header=1 m (for calculation purposes of equivalent
piping length, not for refrigerant charge calculations).
(b) Either unit can be the highest unit.
14.2 Connecting the refrigerant piping
DANGER: RISK OF BURNING/SCALDING
14.2.1 Using the stop valve and service port
To handle the stop valve
Take the following guidelines into account:
▪ Make sure to keep all stop valves open during operation.
▪ The gas and liquid stop valves are factory closed.
▪ Do NOT apply excessive force to the stop valve. Doing so may
break the valve body.
To open the stop valve
1 Remove the stop valve cover.
2 Insert a hexagon wrench into the stop valve and turn the stop
valve counterclockwise.
VRV IV compressor unit for indoor installation
L2+L3+L4≤70 m (90 m)
L2+L5+L6≤70 m (90 m)
L2+L5+L7≤70 m (90 m)
10 m≤x
x≤300 m
If Then
L1≤30 m x≤115 m
L1≤25 m x≤120 m
L1≤20 m x≤125 m
L1≤15 m x≤130 m
L1≤10 m x≤135 m
L1≤5 m x≤140 m
L4≤5 m
L3+L4≤40 m
L5+L6≤40 m
L5+L7≤40 m
H1≤10 m
H3≤30 m
H4≤5 m
H5≤15 m
RKXYQ5T8 + RKXYQ8T7Y1B
4P499900-1A – 2020.10