Determination Of Pipe Size; Determine Refrigerant Pipe Size Pursuant To The Following Guidelines Based On The Indoor Unit Specifications.; Refrigerant Pipe Wall Thickness And Material; On-Site Piping Work - Mitsubishi Heavy Industries FDE40ZMXVG Technical Manual

Twin type All Models
One-way pipe length difference
from the first branching point to 140VN,140VS,
Triple type
the indoor unit
140VNX,140VSX
One-way pipe length difference
140VN,140VS,
from the second branching point Triple type
140VNX,140VSX
to the indoor unit
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
CAUTION
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 the above 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.

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 (Main pipe L)
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
Branching pipe set
Refrigerant piping (branch pipe L1,L2,L3)
In the case of a triple type A
Indoor unit connected
Capacity of indoor unit
Branching pipe set
Refrigerant piping (branch pipe La)
Refrigerant piping (branch pipe L1)
In the case of a triple type B Branching pipe set (After branch pipe La)
Refrigerant piping (branch pipe L2,L3)
Indoor unit connected
Capacity of indoor unit
CAUTION ● When the 50V or 60V 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 (φ6.35 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.
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.

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.
● This unit uses R410A. Always use 1/2H pipes having a 1.0mm or thicker wall for φ19.05
or larger pipes, because O-type pipes do not meet the pressure resistance requirement.

4) On-site piping work

●
Take care so that installed pipes may not touch components within a unit. If touching with an internal
IMPORTANT
component, it will generate abnormal sounds and/or vibrations.
First remove the five screws ( mark) of the service panel and push it down into the direction of the
How to remove the service panel
arrow mark and then remove it by pulling it toward you.
●
The pipe can be laid in any of the following directions: side right, front, rear and downward.
●
Remove a knock-out plate provided on the pipe penetration to open a minimum necessary area and attach an edging material
supplied as an accessory by cutting it to an appropriate length before laying a pipe.
●
Carry out the on site piping work with the service 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
CAUTION
the flare nut.
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.
5) Air tightness test
｜L1−L2｜ −
≦ 10m
≦ 3m ｜L1−L2｜,｜L2−L3｜,｜L3−L1｜
−
−
≦ 10m −
≦ 10m
− − −
≦ 30m
H H H
≦ 15m
≦ 0.5m −
h h1, h2, h3
Model 100V Model 125V Model 140V
Gas pipe Liquid pipe Gas pipe Liquid pipe Gas pipe
φ15.88 φ9.52 φ15.88 φ9.52 φ15.88
Flare
Flare Flare Flare Flare
φ15.88 φ9.52 φ15.88
φ15.88 φ9.52
φ15.88 φ9.52 φ15.88 φ9.52 φ15.88
Model 100V Model 125V Model 140V
DIS-WA1 DIS-WA1 DIS-WA1
φ9.52 φ9.52
φ12.7 φ12.7 φ15.88
φ6.35 φ6.35 φ15.88
φ12.7 φ12.7
Model 50V×2 Model 60V×2 Model 71V×2
DIS-TA1
φ12.7
− −
φ12.7
Model 50Vx3
DIS-WA1
φ15.88
φ12.7
− −
DIS-WA1
φ12.7
φ12.7
Model 50V×3
Taping
Only use nitrogen gas (N
Pipe diameter
[mm]
Minimum pipe wall thickness
[mm]
Pipe material*
*Phosphorus deoxidized seamless copper pipe C1220T, JIS Ｈ3300
Service 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
−
L1−(La＋L2), L1−(La＋L3)
(1)
｜L2−L3｜
Outdoor unit
H
h1, h2, h3
< Triple type A >
H
Liquid pipe
φ9.52
Flare
φ9.52
Outdoor unit
φ9.52
< Triple type B >
φ9.52
φ9.52
φ9.52
φ6.35
φ9.52
φ9.52
H
φ9.52
φ6.35
Outdoor unit
Plug the end of the pipe with tape, or other
＜N ＞
material, and fill the pipe with nitrogen gas.
2
)
2
Brazing
6.35 9.52 12.7 15.88 22.22 25.4
0.8 0.8 0.8 1.0 1.0 1.0
O-type pipe O-type pipe O-type pipe O-type pipe 1/2H-type pipe 1/2H-type pipe
Catch
Catch
For front connection
Flared pipe end: A (mm)
A
Copper
0
pipe outer Ａ
ー0． 4
diameter
9． 1
φ6.35
φ9.52 13． 2
16.6
φ12.7
φ15.88 19.7
Tightening angle Recommended length
of a tool handle (mm)
(° )
45〜60
150
Use a torque wrench. If a torque wrench is not available,
30〜45 200
fasten the flare nut manually first and then tighten it
30〜45
250
further, using the left table as a guide.
15〜20 300
L2
L (riser)
Indoor unit
(The unit of which elevation difference from the outdoor unit is the largest.)
Indoor unit
h1
h3
Indoor unit
h2
L2
L1
L3
L (riser)
Indoor unit
Indoor unit
h1
h3
Indoor unit
h2
L2
L3
La
L1
L (riser)
Primary side Secondary side
Station valve
0.5MPa
Hand
Nitrogen
Relief valve
gas
NOTE
28.58
1.0 ●
Select pipes having a wall thickness larger
1/2H-type pipe than the specified minimum pipe thickness.
For rear connection
For side right connection
For downward connection
Copper pipe protrusion for flaring: B (mm)
Copper
In the case of a rigid (clutch) type
pipe outer
diameter With an R410A tool With a conventional tool
φ6.35
φ9.52
0〜0.5 0.7〜1.3
φ12.7
φ15.88
Do not hold the valve cap area with a spanner.
Model Power source Power cabl
100VN～140VN
Single phase 3 wire
100VNX 220-240V 50Hz
220V 60Hz
125VNX,140VNX
3 phase 4 wire
100VS～140VS
380-415V 50Hz
100VSX～140VSX
380V 60Hz
●
The specifications shown in the above tab
instructions of the indoor unit.
●
Switchgear or Circuit breaker capacity whi
●
The cable specifications are based on the
voltage drop is 2%. For an installation fal
country.
5. TEST RUN
●
Before conduc
WARNING
●
Turn on powe
●
In case of the
●
Always give a
●
Removing the
Take utmost c