Caution For Snow And Seasonal Wind; Snow And Seasonal Wind; Countermeasure To Seasonal Wind - Mitsubishi Electric CITY MULTI PUHY-YMC Installation Manual

9. Caution for snow and seasonal wind

In cold and/or snowy areas, sufficient countermeasures to wind and snow
damages should be taken for operating unit in normal and good condi-
tion in winter time. Even in the other areas, full consideration is required
for installation of unit in order to prevent abnormal operations caused by
seasonal wind or snow. When rain and snow directly fall on unit in
the case of air-conditioning operations in 10 or less degrees centi-
grade outdoor air, mount inlet and outlet ducts on unit for assuring
stable operations.

9.1. Snow and seasonal wind

Prevention of wind and snow damages in cold or snowy areas:
Refer to the figure of snow hood shown below:
• Snow hood
<PUHY-400/500YMC>
1093
A
B
500 (840) 500
B
A Outlet
B Inlet

9.2. Countermeasure to seasonal wind

Referring to the figure shown below, take appropriate measures which
will suit the actual situation of the place for installation.
A
A Seasonal wind
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 accumu-
lated on it.)
2. Install unit so that seasonal 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
Painting: Overall painting with polyester powder
Color
4. 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 freez-
ing on the base.
<PUHN-200/250YMC>
1888
(1990)
A
: Munsell 5Y8/1 (same as that of unit)
1093
A
B
500 (840) 500
B
888
(990)
11