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One-way pipe length of refrigerant piping
Model 71V
Main pipe length
One-way pipe length after the first branching point
Difference of pipe length after the first branching point
When the outdoor unit is positioned higher,
Elevation difference between
indoor and outdoor units
When the outdoor unit is positioned lower,
Elevation difference between indoor units
●
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,
CAUTION
different one-way pipe length restrictions should apply depending on its pipe size. For more information, please see " 6. UTILIZATION OF EXISTING PIPING."
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)
Indoor unit connected
In the case of a single type
Capacity of indoor unit
Branching pipe set
Refrigerant piping (branch pipe L1,L2)
In the case of a twin type
Indoor unit connected
Capacity of indoor unit
When the 40V model is connected as an indoor unit, always use a φ9.52 liquid pipe for the branch (branching pipe – indoor unit) and a different diameter joint supplied with the branching pipe set for connection with the indoor unit ( φ 6.35
●
CAUTION
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) 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.
4) On-site piping work
●
Take care so that installed pipes may not touch components within a unit.
IMPORTANT
If touching with an internal component, it will generate abnormal sounds and/or vibrations.
How to remove the side cover
Please remove the screw of a side cover and remove to the front.
●
Carry out the on site piping work with the operation valve fully closed.
●
Give sufficient protection to a pipe end (compressed and blazed, or with an adhesive tape) so that water
or foreign matters may not enter the piping.
●
Bend a pipe to a radius as large as practical.(R100〜R150) Do not bend a pipe repeatedly to correct
its form.
●
Flare connection is used between the unit and refrigerant pipe. Flare a pipe after engaging a flare nut
onto it. Flare dimensions for R410A are different from those for conventional R407C. Although we
recommend the use of flaring tools designed specifically for R410A, conventional flaring tools can also
be used by adjusting the measurement of protrusion B with a protrusion control gauge.
●
The pipe should be anchored every 1.5m or less to isolate the vibration.
●
Tighten a flare joint securely with a double spanner.
Do not apply force beyond proper fastening torque in tightening the flare nut.
CAUTION
Fix both liquid and gas service valves at the valve main bodies as illustrated on the right, and then fasten them, applying appropriate fastening torque.
Operation valve size
Tightening torque
(mm)
(N-m)
φ6.35 (1/4")
14〜18
φ9.52 (3/8")
34〜42
φ12.7 (1/2")
49〜61
φ15.88(5/8")
68〜82
L
50m or less
L
−
20m or less
−
10m or less
H
30m or less
15m or less
H
−
0.5m or less
Model 71V
Gas pipe
Liquid pipe
φ15.88
φ9.52
Flare
Flare
φ15.88
φ9.52
φ15.88
φ9.52
Model 71V
DIS-WA1
φ12.7
φ9.52
φ12.7
φ6.35
Model 40V×2
Pipe diameter [mm]
Minimum pipe wall thickness [mm]
Pipe material*
O-type pipe
Recommended length
Tightening angle
of a tool handle
(° )
(mm)
45〜60
150
30〜45
200
30〜45
250
15〜20
300
L1＋L1＋L2
Outdoor unit
L
< Twin type >
L1， L2
L1−L2
H
H
H
h
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.
Plug the end of the pipe with tape, or other
material, and fill the pipe with nitrogen gas.
＜N
＞
Taping
2
Only use nitrogen
Brazing
gas (N
)
2
NOTE
6.35
9.52
12.7
15.88
0.8
0.8
0.8
1.0
O-type pipe
O-type pipe
O-type pipe
*Phosphorus deoxidized seamless copper pipe C1220T, JIS H3300
A
Screw
Side cover
Do not hold the valve cap area with a spanner.
L
Indoor unit (The unit of which elevation difference from the outdoor unit is the largest.)
Indoor unit
h
L1
L2
L (riser)
Primary side
Secondary side
Station valve
0.5MPa
Hand
Nitrogen
Relief valve
gas
●
Select pipes having a wall thickness larger
than the specified minimum pipe thickness.
Flared pipe end: A (mm)
Copper
0
pipe outer
Ａ
ー0.4
diameter
φ6.35
9.1
φ9.52
13.2
φ12.7
16.6
φ15.88
19.7
Copper pipe protrusion for flaring: B (mm)
Copper
In the case of a rigid (clutch) type
pipe outer
With an R410A tool
With a conventional tool
diameter
φ6.35
φ9.52
0〜0.5
0.7〜1.3
φ12.7
φ15.88
Use a torque wrench. If a torque
wrench is not available, fasten the
flare nut manually first and then
tighten it further, using the left
table as a guide.
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