8
11
Table 2-2 : Values of indoor unit
Type
Rated Capacity
15
22
28
36
45
56
60
71/73
90
106
140
160
180
224
280
D
1
––
0.
11
7
–
0.
14
5
–––––––
L1
–
0.
12
9
–
0.
19
3
–––––––
U1
–
0.175
0.197
0.263
–
–
–
Y
2
0.
13
0
0.
13
4
–––––––––
K
1
––––
0.
15
3
–
0.
21
6
–
0.
21
6
–––––
K
2
0.
09
7
–––––––––––
T2
–
–
–
0.161
–
0.231
–
0.301
–
–
–
–
F2
0.154
0.205
0.308
–
–
–
M
1
0.
09
8
–––––––––
P1
–
0.122
0.195
0.197
–
0.197
–
–
–
–
–
–
–
R1
–
0.122
0.195
0.197
–
0.197
–
–
–
–
–
–
–
E
2
––––––––––––
0.
47
8
0.
63
7
Table 2-3 : Liquid tube size-up condition of main tube (LM)
Total value of indoor unit
1.200
1.200 <
Main tube (LM)
Liquid tubing size
No need to rank up.
Need to increase by 1 rank.
1-6. Tubing
Size
■
Table 3 : Main Tubing Size (LA)
kW
22.4
28.0
Outdoor unit horsepower
8 HP
10 HP
Gas tube
ø19.05
ø22.22
Flare connection
Brazing connection
Liquid tube
ø9.52
Flare connection
*
If future extension is planned, select the tubing diameter based on the total horsepower
after extension.
* The refrigerant tubing should be used with R410A refrigerant.
*
If the length of the longest tube (L1) exceeds 90 m (equivalent length), increase the main tubing (LM) size by 1 rank for the
gas and liquid tubes. Select from Table 3 and Table 7. Use field-supply reducers.
*
If the longest main tubing length (LM) exceeds 50 m, increase the main tubing size at the portion before 50 m by 1 rank for the
gas tubes.
For the portion that exceeds 50 m, set based on the main tubing size (LA) listed in the table above.
■
Table 4 : Main Tubing Size After Distribution (LB, LC...)
Total capacity
after distribution
Below kW
7.1
(2.5 HP)
16.0
(6 HP)
22.5
(8.1 HP)
–
Over kW
–
7.1
(2.5 HP)
16.0 (6 HP)
22.5
(8.1 HP)
Tubing size
Gas tube
ø12.7
ø
15.88
ø
19.05
ø
22.22
Liquid tube
ø9.52
ø
9.52
ø9.52
ø
9.52
Note:
In case the total capacity of indoor units connected after distribution exceeds the capacity of the outdoor unit, select the ma
in
tubing size for the capacity of the outdoor unit.
■
Table 5 : Indoor Unit Tubing Connection Size
Indoor unit type
15
22
28
36
45
56
60
73
90
106
140
160
180
224
280
Gas tube (mm)
ø12.7
ø
15.88
ø
19.05
ø
22.22
Liquid tube (mm)
ø6.35
ø
9.52
Unit: mm
Unit: mm
Gas tube
Liquid tube
00̲280220̲2WAY̲Eng.indb 11
2016/06/09 18:10:50
12
1-7.
Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 6 : Straight Equivalent Length of Joints
Gas tubing size (mm)
12.7
15.88
19.05
22.22
25.4
90°
elbow
0.30
0.35 0.42 0.48 0.52
45°
elbow
0.23
0.26 0.32 0.36 0.39
U-shape tube bent (R60-100 mm)
0.90
1.05
1.26
1.44
1.56
Trap
bend
2.30 2.80 3.20 3.80 4.30
Y-branch distribution joint
Equivalent length conversion not needed.
B
al
l v
al
ve
fo
r
se
rv
ic
e
Equivalent length conversion not needed.
Table 7 : Refrigerant Tubing
Tubing size (mm)
Material Temper - O
M
aterial Temper - 1/2 H • H
ø6.35
t0.8
ø
22.22
t1.0
ø9.52
t0.8
ø
25.4
t1.0
ø12.7
t0.8
ø15.88
t1.0
ø19.05
t1.2
1-8.
Additional Refrigerant Charge
Additional refrigerant charge amount is calculated below.
Required amount of additional refrigerant charge = [ (Amount of additional refrigerant charge per meter of each size of liquid
tube ×
its tube length) + (...) + (...) ]
*Always charge accurately using a scale for weighing.
* If the total amount of refrigerant for the system exceeds 24
kg
, change the size of the tubing to reduce the amount of refrigerant.
Table 8 : Amount of Additional Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size (mm)
6.35 9.52 12.7
Amount of additional refrigerant charge/m (
g
/m)
26 56
128
Table 9 : Refrigerant Charge Amount at Shipment (for Outdoor Unit)
8 HP
10 HP
6.3
kg
6.6
kg
*
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.
*
Use the material of temper - 1/2 H or - H
for tubing ø22.22 or more.
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00̲280434̲Mini̲VRF̲Mentsuke.indb 8
00̲280434̲Mini̲VRF̲Mentsuke.indb 8
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2016/06/16 11:37:34
