Space Required Around Unit; Selection Of Installation Site - Mitsubishi Electric CITY MULTI PUMY-P125YMA Installationshandbuch

4. Space required around unit

[Fig. 4.0.1] (P.2)
<A> Top view
(1) Basic space required
(2) When there is an obstruction above the unit
If there are no obstacles in front or at the left or right of the unit, obstacles above
the unit are permitted as shown in the diagram.
• The front, right and left sides must be free of obstacles.
(3) When inlet air enters from right and left sides of unit
If the size of the space reserved for the unit is as shown in the diagram, the unit
can be installed so that obstacles are at the right, left and rear.
• The front and top must be unobstructed.
• The height of obstacles on either side must be the same or lower than that of
the outdoor unit.
(4) When unit is surrounded by walls
The unit cannot be used if there are obstacles on all 4 surrounding sides, even if
there is more than the prescribed amount of space around the outdoor unit and if
the top is unobstructed.
(5) Obstacles at the front & rear only
The outdoor unit cannot be used except if the following conditions are met:
An optional outdoor air outlet guide (left/right & top unobstructed) must be fitted.
Moreover, if there is no natural wind flowing between the obstacles, keep the height
or width of the obstacles within the following range to prevent the risk of short
cycling. (If either the front or rear satisfies the requirements, there is no special
restriction on the remaining side).
Obstruction width: 1.5 times the width of outdoor unit or smaller
Obstruction height: Unit height or lower

5. Selection of installation site

[Fig. 5.0.1] (P.2)
Select space for installing the outdoor unit, which will meet the following condi-
tions:
• No direct thermal radiation from other heat sources
• No possibility of short cycle operations caused by exhaust heat from the unit
• No possibility of annoying neighbors by noise from the unit
• No exposure to strong wind
• No possibility of snow damage
• Fixture with strength which bears the weight of the unit
• Note that drain flows out of the unit when heating
• With space for air passage and service work shown opposite.
Because of the possibility of fire, do not install the unit to spaces where gen-
eration, inflow, stagnation, and leak of combustible gas is expected.
• Avoid unit installation in a place where acidic solutions and spray (sulfur) are
often used.
• Take into account the following points if there are chances that cooling opera-
tion will be required when the out door temperature is 10
able outdoor temperature is -5°C.)
• Do not install the outdoor unit in places where it may be exposed directly to
rain, snow or wind.
• If the above location is unavoidable, optional anti-snow ducts or air outlet
guides must be installed.
• Install the outdoor unit on the same floor or in a position higher than the
indoor units.
• In principle, the outdoor unit must be installed in a position higher than the
indoor units. If the outdoor unit has to be installed in a position lower than the
indoor units, keep the difference in height to within 4 m.
8
<B> Side view
°
C or lower. (Allow-
(6) Obstacles in the front (blowing side) only
If there are obstacles in front of the unit, keep the back, left/right, & top unob-
structed.
(7) When installing many outdoor units
1 Side-by-side arrangement
Remove the side screw on the pipe cover.
Keep the top unobstructed.
• Refrigerant piping and electric wiring cannot be attached on the right side.
2 Face-to-face arrangement (with air outlet guide)
Fit an optional outdoor air outlet guide on each unit and set them to "upward blow".
3 Face-to-face arrangement (without air outlet guides)
4 Parallel arrangement (with air outlet guides)
Fit an optional outdoor air outlet guide on each unit.
5 Parallel arrangement (without air outlet guides)
• Do not use the unit in any special environment where oil, steam and sulfuric
gas exist.
Restriction on installing the outdoor unit to conduct cooling operation under the outdoor
temperature of 10°C or less.
(At the same or above the floor on which the indoor unit is installed)
A 4m or less
Precautions
Installation on a rooftop or other windy places
When installing the unit on a rooftop or other location unprotected from the wind,
situate the unit's air outlet so that it is not directly exposed to strong winds. Strong
wind entering the air outlet may impede the normal airflow and cause malfunc-
tions.
The following shows three examples of precautions against strong winds.
1 Face the outlet toward any available wall at least 50 cm away from the
wall.
2 Install an optional air outlet guide and if the unit is installed at a place
where the powerful blast of a typhoon, etc. comes directly into the air
outlet.
3 Position the unit so that the air outlet blows perpendicularly to the sea-
sonal wind direction, if possible.