10
15
1-12. Optional Distribution Joint Kits
See the installation instructions packaged with the distribution joint kit for the installation procedure.
Table 11
Model name
Cooling capacity after distribution
Remarks
1. CZ-P160BK2
22.4 kW or less *
F
or indoor unit
2. CZ-P680BK2
more than 22.4 kW *
F
or indoor unit
* In case the total capacity of indoor units connected after distribution exceeds the capacity of the outdoor unit, select the di
stribution
tubing size for the capacity of the outdoor unit.
■
Tubing size (with thermal insulation)
1. CZ-P160BK2
Use: Total capacity of indoor units after distribution joint is 22.4 kW or less.*
Example:
110
97
110
97
72
72
B
A
D
B
B
C
C
C
D
E
A
C
D E
C
Table 12 : Size of connection point on each part (Shown are inside diameters of tubing)
Size
Part A
P
art B
P
art C
P
art D
P
art E
mm
ø19.05
ø15.88
ø12.7 ø9.52 ø6.35
2. CZ-P680BK2
Use: Total capacity of indoor units after distribution joint is more than 22.4 kW.*
Example:
175
135
110
97
E
E
F
G
F G H
B
C
D
E F
E
B
C
D
F
G
H
D
C
B
E
F
114
72
A
A
A
Table 13 : Size of connection point on each part (Shown are inside diameters of tubing)
Size
Part A
P
art B
P
art C
P
art D
P
art E
P
art F
P
art G
P
art H
mm
ø28.58 ø25.4 ø22.22
ø19.05
ø15.88 ø12.7
ø9.52
ø6.35
* In case the total capacity of indoor units connected after distribution exceeds the capacity of the outdoor unit, select the di
stribution
tubing size for the capacity of the outdoor unit.
Distribution Joint
Reducing Joints
Insulation
Distribution Joint
Reducing Joints
Unit: mm
Unit: mm
Distribution Joint
Insulation
Distribution Joint
Insulation
Insulation
Gas tube
Gas tube
Liquid tube
Liquid tube
00̲280220̲2WAY̲Eng.indb 15
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16
1-13. Example of Tubing Size Selection and Refrigerant Charge Amount
Additional refrigerant charging
Based on the values in Tables 3, 4, 5 and 8, use the liquid tubing size and length, and calculate the amount of additional refr
igerant
charge using the formula below.
Required additional
refrigerant charge (
kg
)
(
a) : Liquid tubing Total length of ø12.7 (m)
(b) : Liquid tubing Total length of ø9.52 (m)
(c) : Liquid tubing Total length of ø6.35 (m)
●
Charging
procedure
Be sure to charge with R410A refrigerant
in liquid form.
1.
After performing a vacuum, charge with refrigerant from the liquid tubing side. At this time, all valves must be in the “fully
closed”
position.
2.
If it was not possible to charge the designated amount, operate the system in Cooling mode while charging with refrigerant from
the gas tubing side. (This is performed at the time of the test run. For this, all valves must be in the “fully open” position.
However
if only one outdoor unit is installed, a balance tube is not used. Therefore, leave the valves fully closed.)
Charge with R410A refrigerant in liquid form.
With R410A refrigerant, charge while adjusting the amount being fed a little at a time in order to prevent liquid refrigerant f
rom
backing up.
●
After charging is completed, turn all valves to the “fully open” position.
●
Replace the tubing covers as they were before.
CAUTION
1. R410A additional charging absolutely must be done through liquid charging.
2. The R410A refrigerant cylinder has a gray base color, and the top part is pink.
3.
The R410A refrigerant cylinder includes a siphon tube. Check that the siphon tube is present. (This is
indicated on the label at the top of the cylinder.)
4.
Due to differences in the refrigerant, pressure, and refrigerant oil involved in installation, it is not possible
in some cases to use the same tools for R22 and for R410A.
=[128 ×(a) + 56 ×(b) + 26 ×(c)] ×10
–3
+ Necessary amount of additional refrigerant charge per
outdoor unit.
*
Use a hexagonal wrench and turn to the left to open.
Liquid tube
Hex wrench width
8 HP
4 mm
10 HP
4 mm
Gas tube
Liquid tube
Fully closed (at shipment)
F
ully open
How to turn the tab
Rotate 90 degrees counterclockwise for OPEN
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00̲280434̲Mini̲VRF̲Mentsuke.indb 10
00̲280434̲Mini̲VRF̲Mentsuke.indb 10
2016/06/16 11:37:35
2016/06/16 11:37:35
