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 * For indoor unit
2. CZ-P680BK2 more than 22.4 kW * For indoor unit
* In case the total capacity of indoor units connected after distribution exceeds the capacity of the outdoor unit, select the distribution
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 Part B Part C Part D Part 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 Part B Part C Part D Part E Part F Part G Part 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 distribution
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
002802202WAYEng.indb15 2016/06/0918:10:58
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 refrigerant
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 from
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) Fully open
How to turn the tab
Rotate 90 degrees counterclockwise for OPEN
002802202WAYEng.indb16 2016/06/0918:10:58
00280434MiniVRFMentsuke.indb1000280434MiniVRFMentsuke.indb10 2016/06/1611:37:352016/06/1611:37:35
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