Caution For Snow And Seasonal Wind; Snow And Seasonal Wind; Countermeasure To Seasonal Wind; Refrigerant Piping Installation - Mitsubishi Electric City Multi Y Série Manuel D'installation

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
1093
500 (840)
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

10. Refrigerant piping installation

Connecting the piping is a terminal-branch type in which refrigerant piping from the outdoor unit is branched at the terminal and connected to each of
the indoor units.
The method of connection consists of flare connections at the indoor units, flange connections for the piping of the outdoor unit and flare connections
for the liquid piping. Note that the branched sections are brazed.
Warning:
Always use extreme care to prevent the refrigerant gas (R22) from leaking while using fire or flame. If the refrigerant gas comes in contact
with the flame from any source, such as a gas stove, it breaks down and generates a poisonous gas which can cause gas poisoning. Never
weld in an unventilated room. Always conduct an inspection for gas leakage after installation of the refrigerant piping has been completed.
A
B
(1990)
500
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 : Munsell 5Y8/1 (same as that of unit)
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.
1888
A
11