Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 69

3) Selection of installation location for the outdoor unit
K
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.
One-way pipe length of refrigerant piping
Main pipe length
One-way pipe length after the first branching point
Difference of pipe length after the first branching point
Elevation difference between
indoor and outdoor units
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
2. Provide a snow hood to the outdoor
3. Install the unit under eaves
unit on site.
or provide 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
Dimensional
Restrictions
restrictions
Model 71V 50m or less
20m or less
10m or less
When the outdoor unit is positioned higher, 30m or less
When the outdoor unit is positioned lower, 15m or less
0.5m or less
Model 71V
Gas pipe
φ15.88
Flare
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.
●
When more than one unit are installed side by side, provide a 250mm or wider interval between them as a service space. In
order to facilitate servicing of controllers, please provide a sufficient space between units so that their top plates can be
removed easily.
●
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.
Example installation
Size
L1
L2
L3
L4
6) Installation
① Anchor bolt fixed position
60
15
Intake
Outlet
150 580
880
Anchor bolt position
● In installing the unit, fix the unit's legs with bolts specified on the above.
● 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 above 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 appearing in the drawing on the right
Single type Twin type
L L1＋L1＋L2
L
L
− L1， L2
−
L1−L2
H H
H
H
−
h
About brazing
Brazing must be performed under a nitrogen gas flow.
Liquid pipe
φ9.52
Without nitrogen gas, a large quantity of foreign matters (oxidized film) are created,
Flare
causing a critical failure from capillary tube or expansion valve clogging.
(mm)
71V
L
Intake 3
L
Ⅰ Ⅱ Ⅲ 2
Open Open 500
Intake
250 Open
300
Outlet
150 100
100 ( service
space
250 250 250
② Notabilia for installation
Fasten with bolts
(M10-12)
Use a thicker block to
Use a long block to
150
anchor deeper.
extend the width.
87.9
< Single type >
H
Outdoor unit
< Twin type >
Indoor unit (The unit of which elevation difference from the outdoor unit is the largest.)
H
L1
Outdoor unit L (riser)
L
4
)
L
1
Indoor unit
L
Indoor unit h
L2