Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 238

PSB012D923N
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.
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.
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.
1.Install the outlet air blow side of the
unit to face a wall of building, or
provide a fence or a windbreak screen.
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.
Descriptions
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
Elevation difference between
indoor and outdoor units
Elevation difference between indoor units
CAUTION
2) Determination of pipe size
●
Determine refrigerant pipe size pursuant to the following guidelines based on the indoor unit specifications.
2. Provide a snow hood to 3. Install the unit under eaves
the outdoor unit on site. or providen the roof on site.
Regarding outline of a snow
hood, refer to our technical
manual.
2.Install the outlet air blow side of 3.The unit should be installed on
the unit in a position perpendicular the stable and level foundation.
to the direction of wind. If the foundation is not level,
tie down the unit with wires.
Wind direction
Wind direction
One-way pipe length difference from the first branching point to the indoor unit
Dimensional
Single type
Model for outdoor units
limitations
100V,125V
≦ 50m
L
140V
100V,125V
≦ 50m
−
140V
≦ 5m −
140V
100V,125V
≦ 30m
−
140V
≦ 27m −
140V
≦ 10m
Twin type
≦ 3m
−
Triple type
140V
≦ 10m
≦ 10m
140V −
≦ 30m
When the outdoor unit is positioned higher,
H
≦ 15m
When the outdoor unit is positioned lower,
≦ 0.5m −
●
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.
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.
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.
Size
L1
L2
L3
L4
6) Installation
① Anchor bolt fixed position
190
● 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.
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.
Marks appearting in the drawing
≧ 3m
< 3m
Triple type A Triple type B
Twin type
− −
L＋L1＋L2
L＋L1＋L2＋L3 L＋La＋L1＋L2＋L3
−
−
L
L L
− −
La
− −
L1, L2
L1, L2, L3 L1 (1)
−
−
La＋L2, La＋L3 (1)
−
−
｜L1−L2｜,｜L2−L3｜,｜L3−L1｜
｜L1−L2｜
−
L−(La＋L2), L1−(La＋L3)
｜L2−L3｜
− −
H H H
h
h1, h2, h3 h1, h2, h3
（mm）
100V〜140V L
Intake 3
L
2
Example installation
Ⅰ Ⅱ Ⅲ
Open 500
Open
Intake
300 5 Open
service
Outlet ( )
150 300 150
space
5 5
5
② Notabilia for installation
Intake
Fasten with bolts
(M10-12)
Outlet
580 200
Use a thicker block to anchor deeper.
Use a long block to extend the width.
< Single type >
H
Outdoor unit
< Twin type >
Indoor unit
(The unit of which elevation difference from the outdoor unit is the largest.)
(1)
L1
H
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
L
4
L
1
Indoor unit
L
h
Indoor unit
L2
h1