UK VRF GEN 24 - Flipbook - Page 46
GENERAL INDEX
2-Pipe ECOi EX ME2 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
R410A distribution joint.
CZ-P680PH2BM (for outdoor unit)
CZ-P1350PH2BM (for outdoor unit)
CZ-P224BK2BM (for indoor unit)
CZ-P680BK2BM (for indoor unit)
CZ-P1350BK2BM (for indoor unit)
LM
B
A
LA
LO
L3
LC
Balance piping
(Ø6,35 mm)
LD
LB
1st distribution
joint for
outdoor unit
4
5
62
63
H1
64
LF
Max.
40 cm
For extension
1st distribution joint
H2
Max. 40 cm
For extension
LH
1
LG
2
3
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 – 64
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
∆ L (L2-L4)
Difference between maximum length and minimum length from the 1st distribution joint
≤502)
Maximum length of main piping (at maximum size) * Even after 1st distribution joint, LM is allowed if at maximum
piping length.
1, 2~ 64
A, B+LO, C+LO
H1
Allowable length of joint piping
≤2101)
Maximum piping length
L1+ 1+ 2~ 63+
A+ B+LF+LG+LH
Allowable elevation difference
≤2001)
Equivalent length
L1
LM
Allowable piping length
Length (m)
Actual length
—3)
Maximum length of each distribution tube
≤504)
Total maximum piping length including length of each distribution tube (only liquid piping)
≤1000
Maximum piping length from outdoor’s 1st distribution joint to each outdoor unit
≤10
When outdoor unit is installed higher than indoor unit
≤50
When outdoor unit is installed lower than indoor unit
≤40
Maximum difference between indoor units
≤15
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
H2
L = Length, H = Height
1) If the longest piping length (L1) exceeds 90 m (equivalent length), increase the sizes of the main tubes (LM) by 1 rank for gas tubes and liquid tubes. Use a field supply reducer. Select the tube size from the
table of main piping sizes (Table 3) and from the table of refrigerant piping sizes (Table 8). 2) When the piping length exceeds 40 m, increase a longer liquid or gas piping by 1 rank. Refer to the Technical Data
for the details. 3) 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 gas tubes. 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. 4) If any of the piping length exceeds 30 m, increase the size of
the liquid and gas tubes by 1 rank. 5) If the total distribution piping length exceeds 500 m, maximum allowable elevation difference (H2) between the indoor units is calculated by the following formula. Make
sure the indoor unit’s actual elevation difference should fall within the figure calculated as follows. Unit of account (meter): 15 x (2 - total piping length (m) ÷ 500).
* The outdoor connection main piping (LO portion) is determined by the total capacity of the outdoor units that are connected to the tube ends. If the size of the existing piping is already larger than the standard
piping size, it is not necessary to further increase the size. ** If the existing piping is used, and the amount of on-site refrigerant charge exceeds the value listed below, then change the size of the piping to
reduce the amount of refrigerant. Total amount of refrigerant for the system with 1 outdoor unit: 50kg. Total amount of refrigerant for the system with 2 outdoor units: 80kg. Total amount of refrigerant for the
system with 3 outdoor units or 4 outdoor units: 105 kg.
Necessary amount of additional refrigerant charge per outdoor unit.
U-8ME2E8
U-10ME2E8
U-12ME2E8
U-14ME2E8
U-16ME2E8
5,5 kg
5,5 kg
7,0 kg
7,0 kg
7,0 kg
System limitations.
Additional refrigerant charge.
Maximum number allowable connected outdoor units
4 1)
Maximum capacity allowable connected outdoor units
224 kW (80 HP)
Maximum connectable indoor units
64 2)
Maximum allowable indoor / outdoor capacity ratio
50-130%3)
Liquid piping size
(Inch (mm))
1/4
(6,35)
Amount of refrigerant
26
charge (g/m)
3/8
(9,52)
1/2
5/8
3/4
7/8
1
(12,70) (15,88) (19,05) (22,22) (25,40)
56
128
185
259
366
490
1) Up to 4 units can be connected if the system has been extended.
2) In the case of 38 HP or smaller units, the number is limited by the total capacity of the connected indoor units.
3) If the following conditions are satisfied, the effective range is above 130% and below 200%.
A) Obey the limited number of connectable indoor units. B) The lower limit of operating range for heating outdoor temperature is limited to -10 °C WB (standard -25 °C WB). C) Simultaneous operation is
limited to less than 130% of connectable indoor units.
Refrigerant piping (existing piping can be used).
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
over t 1,35
Ø44,45
over t1,55
Ø25,40
t 1,0
Ø31,75
t 1,1
Ø41,28
over t 1,45
Ø44,45
over t1,55
* 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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