UK VRF GEN 24 - Flipbook - Page 55
VRF SYSTEMS
VRF SYSTEMS INDEX
3-Pipe ECOi EX MF3 Series piping design
Select installation locations so that the lengths and sizes of refrigerant piping are within the allowable ranges shown in the figure below.
The outdoor connection main
piping (LO portion) is
determined by the total
capacity of the outdoor units
that are connected to the tube
ends.
Note: Be sure to use special
R410A distribution joints (CZ:
optional parts) for outdoor
unit connections and piping
branches.
L1
H3
L2
C
LM
B
A
LO
LA
L3
LC
Balance piping
(Ø6,35 mm)
LD
LB
1st distribution
joint for
outdoor unit
4
6
50
51
R410A distribution joint.
H1
52
CZ-P680PJ2BM
(for outdoor unit)
CZ-P1350PJ2BM
(for outdoor unit)
CZ-P224BH2BM
(for indoor unit)
CZ-P680BH2BM
(for indoor unit)
CZ-P1350BH2BM
(for indoor unit)
LF
Max. 40 cm
For extension
1st distribution joint
4
Solenoid valve kit
H2
Max. 40 cm
For extension
4-1
4
4-2
LH
LG
1
2
3
3-2
2-1 3-1
2-2
L4
Main piping length (maximum
piping size) LM= LA + LB …
Main distribution tubes LC – LH are selected
according to the capacity after the distribution
joint.
Sizes of indoor unit connection piping 1 – 52
are determined by the connection piping sizes
on the indoor units.
Distribution joint (CZ: optional
parts).
Ball valve (field supply).
T-joint (field supply).
Solidly welded shut (pinch
weld).
Ranges that apply to refrigerant piping lengths and to differences in installation heights
Items
Mark
Contents
≤2101)
Maximum piping length
∆ L (L2-L4)
Difference between maximum length and minimum length from the 1st distribution joint
≤502)
Maximum length of main piping (at maximum size)
LM
—3)
* Even after 1st distribution joint, LM is allowed if at maximum piping length.
1, 2~ 52
L1+ 1+ 2~ 51+
A+ B+LF+LG+LH
A, B+LO, C+LO
Allowable length of joint piping
≤2001)
Equivalent length
L1
Allowable piping length
Allowable elevation difference
Length (m)
Actual length
Maximum length of each distribution tube
≤504)
Total maximum piping length including length of each distribution tube (only liquid piping)
≤500
Maximum piping length from outdoor’s 1st distribution joint to each outdoor unit
≤10
1-2, 2-2 ~ 52-2 Maximum length between solenoid valve kit and indoor unit
When outdoor unit is installed higher than indoor unit
H1
When outdoor unit is installed lower than indoor unit
≤30
H2
Maximum difference between indoor units
≤155)
H3
Maximum difference between outdoor units
≤4
L3
T-joint piping (field-supply); Maximum piping length between the first T-joint and solidly welded-shut end point ≤2
≤50
≤40
L = Length, H = Height
1) If the longest piping length (L1) exceeds 90 m (equivalent length), increase the sizes of the main pipes (LM) by 1 rank for suction pipes, discharge pipes and liquid pipes. Use a field supply reducer. Select the
pipe size from the table of main piping sizes (Table 3) and from the table of refrigerant piping sizes (Table 8). 2) If the longest main piping length (LM) exceeds 50 m, increase the main piping size at the portion
before 50 m by 1 rank for the suction pipes and discharge pipes. Use a field supply reducer. Determine the length less than the limitation of allowable maximum piping length. For the portion that exceeds 50 m,
set based on the main piping size (LA) listed in Table 3. 3) If the piping length marksd “L” (L2-L4) exceeds 40 m, increase the piping size at the portion after the 1st distribution joint by 1 rank for the liquid pipe,
suction pipe and discharge pipe. Refer to the Technical Data for the details. 4) If any of the piping length exceeds 30 m, increase the size of the suction pipes,discharge pipes and liquid pipes by 1rank.
* The outdoor connection main piping (LO portion) is determined by the total capacity of the outdoor units that are connected to the pipe ends.
System limitations.
Additional refrigerant charge.
Maximum number allowable connected outdoor units
3
Maximum capacity allowable connected outdoor units
135 kW (48 HP)
Maximum connectable indoor units
52
Maximum allowable indoor / outdoor capacity ratio
50-150%
Liquid piping size
(Inch (mm))
1/4
(6,35)
3/8
(9,52)
1/2
5/8
3/4
7/8
(12,70) (15,88) (19,05) (22,22)
Amount of refrigerant charge
(g/m)
26
56
128
185
259
366
1) In the case of 24 HP (type 68 kW) or smaller units, the number is limited by the total capacity of the connected indoor units.
2) Up to 3 units can be connected if the system has been extended.
3) It is strongly recommended that you choose the unit so the load can become between 50 and 130%.
Necessary amount of additional refrigerant charge per meter, according to discharge piping size.
Discharge piping size
Inch (mm)
1/2 (12,70)
5/8 (15,88)
3/4 (19,05)
7/8 (22,22)
1 (25,40)
1-1/8 (28,58)
1-1/4 (31,75)
1-1/2 (38,10)
Additional amount
g/m
12
21
31
41
55
71
89
126
Refrigerant piping.
Piping size (mm)
Material Temper - O
Material Temper - 1/2 H, H
Ø6,35
t 0,8
Ø12,70
t 0,8
Ø9,52
t 0,8
Ø15,88
t 1,0
Ø19,05
t 1,2
Ø22,22
t 1,0
Ø28,58
t 1,0
Ø38,10
t 1,15
Ø25,40
t 1,0
Ø31,75
t 1,1
Ø41,28
t 1,20
* When bending the tubes, use a bending radius that is at least 4 times the outer diameter of the tubes. In addition, take sufficient care to avoid crushing or damaging the tubes when bending them.
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