Mitsubishi Electric FDC100VNA, Technical Manual

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'11 • PAC-T-160
2. REFRIGERANT PIPING WORK
CAUTION
CAUTION
●
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 the above table and right figure.
●
When the 50V or 60V model is connected as an indoor unit, always use a φ 9.52 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 on the liquid pipe side).
If a φ 6.35 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.
● This unit uses R410A. Always use 1/2H pipes having a 1.0mm or thicker wall for φ 19.05
or larger pipes, because O-type pipes do not meet the pressure resistance requirement.
Pipe diameter
[mm]
Minimum pipe wall thickness [mm]
Pipe material*
6.35
0.8
O-type pipe
9.52
0.8
O-type pipe
12.7
0.8
O-type pipe
15.88
1.0
O-type pipe
22.22
1.0
1/2H-type pipe
25.4
1.0
1/2H-type pipe
28.58
1.0
1/2H-type pipe
NOTE
*Phosphorus deoxidized seamless copper pipe C1220T, JIS Ｈ 3300
Intake
(
service
space
)
Intake
Outlet
5) Installation space
● Walls surrounding the unit in the four sides are not acceptable.
● There must be a 1-meter or larger space in the above.
● Where a danger of short-circuiting exists, install guide louvers.
● When more than one unit are installed, provide sufficient intake space consciously so that short-circuiting may not occur.
● Where piling snow can bury the outdoor unit, provide proper snow guards.
● A barrier wall placed in front of the exhaust diffuser must not be higher than the unit.
L
3
L
2
L
4
L
1
Example installation
Size
L1
L2
L3
L4
Ⅰ
Open
300
150
5
Ⅱ
Open
5
300
5
Ⅲ
500
Open
150
5
（mm）
1) Restrictions on unit installation and use
2) Determination of pipe size
● Determine refrigerant pipe size pursuant to the following guidelines based on the indoor unit specifications.
②
Notabilia for installation
Intake
Outlet
Fasten with bolts
(M10-12)
Use a thicker block to anchor deeper.
Use a long block to extend the width.
190 200 580
20
410
20
①
Anchor bolt fixed position
● In installing the unit, fix the unit’s legs with bolts specified on the left.
● The protrusion of an anchor bolt on the front side must be kept within 15 mm.
● Securely install the unit so that it does not fall over during earthquakes or strong winds, etc.
● Refer to the left illustrations for information regarding concrete foundations.
● Install the unit in a level area. (With a gradient of 5 mm or less.)
Improper installation can result in a compressor failure, broken piping within the unit and abnormal noise generation.
6) Installation
Plug the end of the pipe with tape, or other
material, and fill the pipe with nitrogen gas.
Only use nitrogen gas (N
2
)
Taping
＜ N
2
＞
Nitrogen
Brazing
Station valve
Primary side Secondary side
0.5MPa
Hand
Relief valve
Nitrogen
gas
● Select pipes having a wall thickness larger
than the specified minimum pipe thickness.
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.
About brazing
Descriptions
Outdoor unit connected
Refrigerant piping (branch pipeL)
Flare Flare Flare Flare Flare Flare
Gas pipe Liquid pipe Gas pipe Liquid pipe Gas pipe Liquid pipe
One-way pipe length after the first
branching point
Dimensional
limitations
Elevation difference between
indoor and outdoor units
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
One-way pipe length between the first
branching point from to the second
branching point
Main pipe length
Elevation difference between indoor units
One-way pipe length difference from the first branching point to the indoor unit
Marks appearting in the drawing
Model for outdoor units Single type Twin type
Triple type A
Triple type B
< 3m ≧ 3m
L
100VN,125VN,100VS,125VS
≦ 50m
≦
100m
≦ 5m
≦ 30m
≦ 27m
≦
10m
≦
3m
≦ 10m
≦ 10m
≦ 30m
≦ 15m
≦ 0.5m
140VN,140VS
100VN,125VN,100VS,125VS,
100VNX,125VNX,100VSX,125VSX
140VN,140VS,140VNX,140VSX
140VN,140VS,
140VNX,140VSX
When the outdoor unit is positioned higher,
When the outdoor unit is positioned lower,
140VN,140VS,
140VNX,140VSX
Twin type
Triple type
140VNX,140VSX
140VN,140VS,
140VNX,140VSX
100VNX,125VNX,100VSX,125VSX
100VN,125VN,100VS,125VS
≦ 50m
≦ 100m
140VN,140VS
140VNX,140VSX
100VNX,125VNX,100VSX,125VSX
H
−
−
−
−
−
−
−
−
−
−
−
−
−
L
H
L ＋ L1 ＋ L2 ＋ L3
−
−
− −
− −
−
−
La
L1 (1)
L
L L
L ＋ La ＋ L1 ＋ L2 ＋ L3
L ＋ L1 ＋ L2 ＋ L3 L ＋ La ＋ L1 ＋ L2 ＋ L3
｜ L2 − L3 ｜
L − (La ＋ L2), L1 − (La ＋ L3)
(1)
La ＋ L2 , La ＋ L3 (1)
L1 , L2 , L3
h1, h2, h3
H
h1, h2, h3
｜ L1 − L2 ｜ , ｜ L2 − L3 ｜ , ｜ L3 − L1 ｜
− −
−
−
−
−
−
−
−
L ＋ L1 ＋ L2
L1
,
L2
｜ L1 − L2 ｜
L
H
h
Indoor unit connected
Capacity of indoor unit
Branching pipe set
Branching pipe set
Refrigerant piping (branch pipe L1,L2)
Indoor unit connected
Capacity of indoor unit
Indoor unit connected
Capacity of indoor unit
Refrigerant piping (branch pipe L1,L2,L3)
Indoor unit connected
Capacity of indoor unit
Branching pipe set
Refrigerant piping (branch pipe La)
Indoor unit connected
Refrigerant piping (branch pipe L2,L3)
In the case of a single type
In the case of a twin type
In the case of a triple type A
In the case of a triple type B
DIS-WA1 DIS-WA1 DIS-WA1
DIS-TA1
DIS-WA1
DIS-WA1
φ 15.88 φ 9.52
φ 9.52
φ 9.52
φ 15.88
φ 15.88
φ
9.52 φ 12.7
φ 6.35
φ 12.7
Model 50V × 2 Model 71V × 2
Model 50Vx3
Model 50V × 3
φ 15.88 φ 9.52
φ 9.52
φ
9.52
φ 15.88
φ 15.88 φ 9.52
φ 15.88 φ 9.52
φ
15.88
φ
9.52
Refrigerant piping (branch pipe L1) φ 12.7 φ 9.52
φ 15.88 φ 9.52
φ
9.52
φ
15.88
φ
9.52
φ
15.88 φ 15.88
φ
9.52 φ 12.7
φ 6.35
φ 12.7
φ
9.52
φ 12.7
φ 6.35 φ 12.7
φ 9.52
φ
12.7
φ 6.35 φ
12.7
Model 60V × 2
Model 100V Model 125V Model 140V
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.
< Single type >
< Triple type >
< Triple type >
< Twin type >
Indoor unit
(The unit of which elevation difference from the outdoor unit is the largest.)
Indoor unit
(The unit of which elevation difference from the outdoor unit is the largest.)
L1
L2
L (riser)
Outdoor unit
Indoor unit h
L
H
H
H
H
Outdoor unit
Indoor unit
L1
L2
L3
L (riser)
Outdoor unit
Indoor unit
Indoor unit
h3
h3
h1
h2
Type A
Type B
L (riser)
Outdoor unit
Indoor unit
Indoor unit
Indoor unit
L1
L2
L3
La
h1
h2
● 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.
7) To run the unit for a cooling operation, when the outdoor temperature
is –5°C or lower.
● 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.
3) Selection of installation location for the outdoor unit
Be sure to select a suitable installation place in consideration of following conditions.
〇
A place where it is horizontal, stable and can endure the unit weight and will not allow vibration transmittance of the unit.
〇
A place where it can be free from possibility of bothering neighbors due to noise or exhaust air from the unit
〇
A place where the unit is not exposed to oil splashes.
〇
A place where it can be free from danger of flammable gas leakage.
〇
A place where drain water can be disposed without any trouble.
〇
A place where the unit will not be affected by heat radiation from other heat source.
〇
A place where snow will not accumulate.
〇
A place where the unit can be kept away 5m or more from TV set and/or radio receiver in order to avoid any radio or TV interference.
〇
A place where good air circulation can be secured, and enough service space can be secured for maintenance and service of the unit safely.
〇
A place where the unit will not be affected by electromagnetic waves and/or high-harmonic waves generated by other equipment.
〇
A place where chemical substances like sulfuric gas, chloric gas, acid and alkali (including ammonia), which can harm the
unit, will not be generated and not remain.
〇 A place where strong wind will not blow against the outlet air blow of the unit.
1.Install the outlet air blow side of the
unit to face a wall of building, or
provide a fence or a windbreak screen.
3.The unit should be installed on
the stable and level foundation.
If the foundation is not level,
tie down the unit with wires.
Over 500 mm
Wind direction
2.Install the outlet air blow side of
the unit in a position perpendicular
to the direction of wind.
Wind direction
4) Caution about selection of installation location
(1) If the unit is installed in the area where the snow will accumulate, following measures are required.
The bottom plate of unit and intake, outlet may be blocked by snow.
1.Install the unit on the base so
that the bottom is higher than
snow cover surface.
2.Provide a snow hood to
the outdoor unit on site.
3.Install the unit under eaves
or providen the roof on site.
Since drain water generated by defrost control may freeze, following measures are required.
● Don’t execute drain piping work by using a drain elbow and drain grommets (optional parts). [Refer to Drain piping work.]
● Recommend setting Defrost Control (SW3-1) and Snow Guard Fan Control (SW3-2). [Refer to Setting SW3-1, SW3-2.]
(2) If the unit can be affected by strong wind, following measures are required.
Strong wind can cause damage of fan (fan motor), or can cause performance degradation, or can trigger anomalous
stop of the unit due to rising of high pressure.
Regarding outline of a snow
hood, refer to our technical
manual.
One-way pipe length of
refrigerant piping
Model 100V Model 125V Model 140V