4-4.Weather Countermeasure - Mitsubishi Electric CITY MULTI PEFY-P22VMS-E-S Data Book

4. Outdoor Installation
4-4. Weather countermeasure
In cold and/or snowy areas, sufficient countermeasures to wind and snow damages should be taken for operating unit in normal
and good condition in winter time. Surround the units with snow nets or fences to protect them from snow. Even in the other areas,
full consideration is required for installation of unit in order to prevent abnormal operations caused by wind or snow. When rain
and snow directly fall on unit in the case of air-conditioning operations in 10 or less degrees centigrade outdoor air
(50 or less degrees fahrenheit outdoor air) , mount inlet and outlet ducts on unit for assuring stable operations.
Countermeasure to snow and wind
Prevention the Outdoor unit from wind and snow damages in cold or snowy areas, snow hood shown below is recommended
and helpful.
*Do not use a snow hood made of stainless steel, which may cause the unit to rust. If the use of a stainless snow hood is the
only option, contact the sales office before installing it.
• Snow hood
906 [35-11/16]
(920)[36-1/4]
B
453
[17-27/32] 910 [35-27/32]
<Front view>
Note:
1. Height of frame base for snow damage prevention (H) shall be twice as high as expected snowfall. Width of frame base
shall not exceed that of the unit. The frame base shall be made of angle steel, etc., and designed so that snow and wind slip
through the structure. (If frame base is too wide, snow will be accumulated on it.)
2. Install unit so that wind will not directly lash against openings of inlet and outlet ducts.
3. Build frame base at customer referring to this figure.
Material : Galvanized steel plate 1.2T [1/16 in. T]
Painting : Overall painting with polyester powder
Color : Munsell 5Y8/1 (same as that of unit)
4. To install units side by side, install a filler plate between
the fan guard and the outlet-side snow food as shown in Figure A.
(The filler plate provided accommodates the installation pitch of between 30-80 mm [1-3/16~3-5/32 in.].)
5. When the unit is used in a cold region and the heating operation is continuously
performed for a long time when the outside air temperature is below freezing, install
a heater to the unit base or take other appropriate measures to prevent water from freezing on the base.
Countermeasure to wind
Referring to the figure shown below, take appropriate measures which will suit the actual situation of the place for installation.
A unit installed alone is vulnerable to strong winds. Select the installation site carefully to minimize the effect of winds.
To install a unit in a place where the wind always blows from the same direction, install the unit so that the outlet faces away
from the direction of the wind.
A Wind
Install the outdoor unit where seasonal
winds do not blow directly against the
unit, such as behind a building.
B
B
453
[17-27/32] [17-27/32]
A
SYSTEM DESIGN
1206 [47-1/2]
(1220)[48-1/16]
453 453
[17-27/32]
1210 [47-21/32]
<Front view>
Install the outdoor unit to avoid having
A
seasonal winds against the front of air
outlet/inlet on the unit.
750 [29-17/32]
A
(760)
[29-15/16]
B
760 [29-15/16] [17-27/32]
<Side view>
A Outlet
B Inlet
Figure A
A
C7-R Rev.
B
453
Filler plate
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