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Please choose from the table below an appropriate pipe size as determined by the total capacity of indoor units connected downstream, provided, however, that the
pipe size for this section should not exceed the main size (Section B in Figure 1).
In the downstream of a branching control, no gas discharge pipe needs to be connected.
●
Total capacity of indoor units
Less than 70
70 or more but less than 180
180 or more but less than 371
371 or more but less than 540
540 or more but less than 700
700 or more but less than 1100
1100 or more
Please use C1220T-1/2H for φ19.05 or larger pipes.
*1: When connecting indoor units of 280 at the downstream and the main gas pipe is of ø22.22 or larger, use the pipe of ø22.22x t1.0.
(d) Indoor unit side branching pipe – Indoor unit: Section D in Figure 1
Indoor unit connection pipe size table
In the downstream of a branching control, no gas discharge pipe needs to be connected.
●
Capacity
Indoor unit
71, 80, 90, 112, 140, 160
Please use C1220T-1/2H for φ19.05 or larger pipes.
(4) Selection of an outdoor unit side branching pipe set
This branching pipe set will always become necessary when units are used in combination. (When a unit is used as a standalone installation, it is not required)
Outdoor unit
For two units
For three units
Please note
c) Always install branching joints (for suction gas, discharge gas and liquid) in such a manner that they form either correct horizontal or vertical branch.
Horizontal
Incline branching pipes within
(5) Selection of an indoor unit side branching pipe set
(a) Method of selecting a branching pipe set
As an appropriate branching pipe size varies with the connected capacity (total capacity connected downstream), determine a size from the following table.
●
① In the upstream of a branching control
Total capacity downstream
Less than 180
180 or more but less than 371
371 or more but less than 540
540 or more
Please note
b) Always install branching joints (for suction gas, discharge gas and liquid) in such a manner that they form
either correct horizontal or vertical branch.
(6) Selection of a branching control
Select an appropriate one according to the combined total capacity of the indoor units connected downstream.
●
The numbers of indoor units that can be connected to branching controls are depicted in the table below.
●
No liquid pipe needs to be connected to a branching control.
●
In the downstream of a branching control, no discharge gas pipe needs to be connected.
●
Do not run the unit, while a branching control is yet to be connected with indoor units.
●
Total capacity downstream
Less than 112
112 or more but less than 180
180 or more but less than 280
(2) Piping work
Suction gas pipe (gas pipe)
φ12.7 ×t0.8
φ15.88×t1.0
φ19.05×t1.0
φ25.4 (φ28.58)×t1.0
φ28.58×t1.0
φ31.8×t1.1 (φ34.92×t1.2 )
φ38.1×t1.35 (φ34.92×t1.2 )
Suction gas pipe (gas pipe)
15, 22, 28
36, 45, 56
224
280
±15°
Floor surface
Floor surface
Branching pipe set model type
DIS-22-1-RG
DIS-180-1-RG
DIS-371-2-RG
DIS-540-2-RG
Horizontal
Floor surface
Branching control model type
PFD1124-E
PFD1804-E
PFD2804-E
Discharge gas pipe
φ9.52 ×t0.8
φ12.7 ×t0.8
φ15.88×t1.0
※1
φ22.22×t1.0
φ25.4 (φ22.22)×t1.0
φ28.58×t1.0
φ31.8×t1.1 (φ28.58×t1.0 )
φ 9.52×t0.8
φ12.7 ×t0.8
φ15.88×t1.0
φ19.05×t1.0
φ22.22×t1.0
φ9.52 x t0.8.
Branching pipe set
DOS-2A-3-R
DOS-3A-3-R
Floor surface
② In the downstream of a branching control
Total capacity downstream
Less than 180
180 or more but less than 371
371 or more but less than 540
540 or more
Floor surface
Number of connectable units
1 - 5
1 - 8
1 - 10
152
-
-
Liquid pipe
φ9.52×t0.8
φ12.7 ×t0.8
φ15.88×t1.0
φ19.05×t1.0
Discharge gas pipe
φ 6.35×t0.8
※2
φ 6.35×ｔ 0.8
φ 9.52×t0.8
φ12.7 ×t0.8
φ15.88×t1.0
φ 9.52×ｔ 0.8
φ19.05×t1.0
Vertical
Floor surface
Branching pipe set model type
DIS-180-1G
DIS-371-1G
Floor surface
Restriction on the number of branching
●
controls to be connected to the
outdoor unit is as follows.
Minimum number of connectable
Outdoor unit
- 280
- 560
- 850
- 1120
- 1680
※ For PFD1124×4-E model, calculate the number of units taking
1 branching control as 4 controls in this limit.
'17 • KX-SM-261
Liquid pipe
DIS-22-1G
DIS-540-3
Vertical
Floor surface
branching controls
※
2
4
6
8
10
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