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Over 500 mm
2. REFRIGERANT PIPING WORK
1) Restrictions on unit installation and use
●
Check the following points in light of the indoor unit specifications and the installation site.
●
Observe the following restrictions on unit installation and use. Improper installation can result in a compressor failure or performance degradation.
Restrictions
One-way pipe length of refrigerant piping
Main pipe length
One-way pipe length between the first branching
point from to the second branching point
One-way pipe length after the first branching
point
One-way pipe length after the first branching
point and second branching point
One-way pipe length difference from the first
branching point to the indoor unit
One-way pipe length difference from the
second branching point to the indoor unit
Total pipe length after the second branching point
Elevation difference between indoor and outdoor
units
Elevation difference between indoor units
●
For model 200V, always use φ12.7mm liquid pipes, when the length of the main "L" exceeds 40m. If φ9.52mm pipes are used in an installation having over 40m piping, they can cause
CAUTION
performance degradation and/or water leaks from an indoor unit.
●
The use restrictions appearing in the table above are applicable to the standard pipe size combinations shown in the table below. Where an existing pipe system is utilized, different one-way pipe length
restrictions should apply depending on its pipe size. For more information, see " 6. UTILIZATION OF EXISTING PIPING."
●
With the triple pipe connection, the way of use is different when the difference of one-way pipe length after the first branching point is 3m to 10m. For details, refer to theabove table and right figure.
Note (1) Install the indoor units so that L + L1 becomes the longest one-way pipe.
Keep the pipe length difference between L1 and (La + L2) or (La + L3) within 10m.
Note (2) Connect the unit that is the maximum capacity with L1.
2) Determination of pipe size
●
Determine refrigerant pipe size pursuant to the following guidelines based on the indoor unit specifications.
Outdoor unit connected
Refrigerant piping (branch pipeL)
In the case of asingle type
In the case of atwin type
In the case of a triple type A
In the case of a triple type B
In the case of a W-twin type
●
When the model 50V or model 60V model is connected as an indoor unit, always use aφ9.52 liquid pipe for the branch (branching pipe – indoor unit) and a different diameter joint supplied with
CAUTION
the branching pipe set for connection with the indoor unit ( φ 6.35 on the liquid pipe side).
If a φ6.35 pipe is used for connection with a branching pipe, a refrigerant distribution disorder may occur, causing one of the indoor units to fall short of the rated capacity.
●
A riser pipe must be a part of the main. A branching pipe set should be installed horizontally at a point as close to an indoor unit as possible.
A branching part must be dressed with a heat-insulation material supplied as an accessory.
●
For the details of installation work required at and near a branching area, see the installation manual supplied with your branching pipe set.
3) How to use pipe reducer
●
φ22.22(OD) size of the refrigerant gas pipe can
be used by using accessory pipe A,B.
Accessory pipe A
φ 22.22 (ID)
Field piping
φ22.22(OD)
Heavy
4) Refrigerant pipe wall thickness and material
●
Select refrigerant pipes of the table shown on the right wall thickness and material as specified for each pipe
size.
●
This unit uses R410A. Always use 1/2H pipes having a 1.0mm or thicker wall for φ19.05 or larger pipes,
Wind direction
One-way pipe length difference from the first branching point to the indoor unit
Dimensional
Single type
Twin type
Model for outdoor units
restrictions
≦ 40m
φ9.52
200V Liquid Piping
φ12.7
L＋L1
≦ 70m
L
L＋L2
φ25.4 or φ28.58
200V
Gas piping
L＋L1, L＋La＋L2, L＋La＋L3
250V
≦ 35m
φ22.22
≦ 40m
φ9.52
200V Liquid Piping
φ12.7
≦ 70m
−
L
φ25.4 or φ28.58
200V
Gas piping
≦ 35m
250V
φ22.22
200V
−
−
≦ 5m
250V
200V
≦ 30m
−
−
250V
L1, La＋L2, L＋La＋L3
≦ 27m
−
−
200V
≦ 10m
Twin type
｜L1−L2｜, ｜L2−L3｜, ｜L3−L1｜
≦ 3m
200V
≦ 10m
Triple type
−
｜L1−L2｜
≦ 3m
｜L1−(La＋L2)｜,｜L1−(La＋L3)｜,｜L2−L3｜
250V
200V . 250V
≦ 10m
W-twin type
≦ 10m
−
−
200V
≦ 15m
−
−
≦ 30m
When the outdoor unit is positioned higher,
H
H
≦ 15m
When the outdoor unit is positioned lower,
≦ 0.5m
−
h
Model 200V
Gas pipe
Liquid pipe
Gas pipe
φ22.22
φ9.52
φ22.22
Brazing
Flare
Brazing
φ9.52 or φ12.7
φ22.22
φ22.22
Indoor unit connected
φ25.4
φ9.52
φ25.4
Capacity of indoor unit
Model 200V, Model VA80
Model 250V, Model VA100
Branching pipe set
DIS-WB1
Refrigerant piping (branch pipe L1,L2)
φ15.88
φ9.52
φ15.88
Indoor unit connected
φ15.88
φ9.52
φ15.88
Capacity of indoor unit
Model 100V×2, Model VA40×2
Model 125V×2, Model VA50×2
Branching pipe set
DIS-TB1
Refrigerant piping (branch pipe L1,L2,L3)
φ15.88
φ9.52
Indoor unit connected
φ15.88
φ9.52
Capacity of indoor unit
Model 71V×3, Model VA30×3
Branching pipe set
DIS-WB1
Refrigerant piping (branch pipe La,L1)
φ15.88
φ9.52
φ15.88
Branching pipe set
DIS-WA1
Refrigerant piping (branch pipe L2,L3)
φ15.88
φ9.52
φ12.7
Indoor unit connected
φ15.88
φ9.52
φ12.7
Capacity of indoor unit
Model 71V×3, Model VA30×3
Model 60V×2＋ Model 125V
Branching pipe set
DIS-WA1
Refrigerant piping (branch pipe La,Lb)
φ15.88
φ9.52
φ15.88
Branching pipe set
DIS-WA1 × 2
Refrigerant piping (branch pipe L1,L2,L3,L4)
φ12.7
φ9.52
φ12.7
Indoor unit connected
φ12.7
φ6.35
φ12.7
Capacity of indoor unit
Model 50V×4, Model VA20×4
.
●
φ25.4(OD) size of the refrigerant gas pipe can be used
by using accessory pipe A and joint pipe C.
Ready joint C yourself. Need not accessory pipe B.
Accessory pipe B
Field piping
Accessory pipe A
φ 22.22 (ID)
φ25.4(OD)
φ 22.22 (ID)
Joint pipe C
φ 25.4 (ID)
φ 25.4 (ID)
Branching pipe set
Branching pipe set
(DIS-WB1,DIS-TB1)
(DIS-WB1,DIS-TB1)
●
When the outdoor air temperature is -5°C or lower, provide a snow hood to the outdoor unit on site.
So that strong wind will not blow against the outdoor heat exchanger directly. Regarding outline of a snow hood,
refer to our technical manual.
Marks appearting in the drawing
≧
3m
< 3m
W-twin type
Triple type A
Triple type B
L＋L1, L＋L2, L＋L3
L＋L1
(1)
L＋La＋L1, L＋La＋L2
L＋Lb＋L3, L＋Lb＋L4
Prohibitation of the use
(2) (type B)
L＋L1
(1)
L
L
Prohibitation of the use
−
La
−
La
Prohibitation of the use
L1, L2, L3
L1
La＋L1, L＋La＋L2
(1)
Lb＋L3, Lb＋L4
Prohibitation of the use
(2) (type B)
−
−
La＋L2, La＋L3
(1)
−
−
−
−
L1−(La＋L2), L1−(La＋L3)
(1)
Prohibitation of the use
(2) (type B)
｜L1−L2｜, ｜L3−L4｜
−
−
｜(L1＋La)−(L3＋Lb)｜, ｜(L1＋La)−(L4＋Lb)｜
｜(L2＋La)−(L3＋Lb)｜,｜ (L2＋La)−(L4＋Lb)｜
−
｜L2−L3｜
｜L1−L2｜, ｜L3−L4｜
−
−
L1＋L2, L3＋L4
H
H
H
h1, h2, h3
h1, h2, h3
h1, h2, h3, h4, h5, h6
Model 250V
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
φ12.7
φ22.22
φ12.7
φ22.22
φ12.7
Flare
Brazing
Flare
Brazing
φ12.7
φ22.22
φ12.7
φ22.22
φ12.7
φ12.7
−
−
DIS-WB1
φ9.52
−
−
φ9.52
−
−
−
DIS-WB1
DIS-WB1
DIS-WB1
φ9.52
φ15.88
φ9.52
φ15.88
φ9.52
DIS-WA1
DIS-WA1
DIS-WA1
φ9.52
φ15.88
φ9.52
φ15.88
φ9.52
φ6.35
φ15.88
φ9.52
φ15.88
φ6.35
Model 71V×2＋Model 100V
Model VA25×2＋Model VA50
Model VA30×2＋Model VA40
DIS-WB1
DIS-WB1
φ9.52
φ15.88
φ9.52
DIS-WA1 × 2
DIS-WA1 × 2
−
φ9.52
φ12.7
φ9.52
φ6.35
φ12.7
φ6.35
Model 60V×4
Model VA25×4
●
φ28.58(OD) size of the refrigerant gas pipe can be
used by using accessory pipe A and joint pipe C,D.
Ready joint C and D yourself.
Accessory pipe A
Field piping φ28.58(OD)
φ 22.22 (ID)
Joint pipe D
Joint pipe C
φ 25.4 (ID)
Branching pipe set
(DIS-WB1,DIS-TB1)
Pipe diameter
6.35
9.52
[mm]
Minimum pipe wall thickness
[mm]
0.8
0.8
Pipe material*
O-type pipe
O-type pipe
< Single type >
H
Outdoor unit
< Twin type >
Indoor unit
(The unit of which elevation difference from the outdoor unit is the largest.)
H
L1
L (riser)
Outdoor unit
< Triple type >
Type A
Indoor unit
(The unit of which elevation difference from the outdoor unit is the largest.)
Indoor unit
L2
H
L1
L (riser)
Outdoor unit
< Triple type >
Type B
Indoor unit
(The unit of which elevation difference from the outdoor unit is the largest.)
Indoor unit
Flare
L2
H
L1
L (riser)
Outdoor unit
< W-twin type >
Indoor unit
(The unit of which elevation difference from the outdoor unit is the largest.)
h2
h1
Indoor unit
h3
L1
Indoor unit
h4
L2
L3
H
La
L (riser)
Outdoor unit
About brazing
Brazing must be performed under a nitrogen gas flow.
Without nitrogen gas, a large quantity of foreign matters (oxidized film) are
created, causing a critical failure from capillary tube or expansion valve clogging.
Primary side
Plug the end of the pipe with tape, or other
material, and fill the pipe with nitrogen gas.
Station valve
＜N
＞
Taping
2
Nitrogen
Relief valve
gas
Only use nitrogen
Brazing
gas (N
)
2
NOTE
12.7
15.88
22.22
25.4
28.58
0.8
1.0
1.0
1.0
1.0
●
Select pipes having a wall thickness larger
O-type pipe
O-type pipe
1/2H-type pipe
1/2H-type pipe
1/2H-type pipe
than the specified minimum pipe thickness.
Indoor unit
L
Indoor unit
h
L2
h1
h3
Indoor unit
h2
L3
h1
h3
Indoor unit
h2
L3
La
Indoor unit
h6
h5
L4
Lb
Secondary side
0.5MPa
Hand
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