Consideration To Seasonal Wind; Consideration To Snow; Prevention Of Short-Circuiting; Foundation Provision - Hitachi RAS-5FSN Installation And Operation Manual

2. Consideration to Seasonal Wind

Avoid the installation that the air intake side (Rear) of the unit is faced directly against a seasonal strong wind.
Correct
Air Intake Side
(Rear)
In case of 5~16FSN(E) ; 8~10FXN(E)
In case of 20~30FSN ; 16~30FXN

3. Consideration to Snow

Apply an air discharge hood, an air intake hood and a
higher foundation to prevent accumulation of snow on
the air outlet and air inlet.
Correct
Air Discharge Hood
Seasonal
Wind
Air Intake
Foundation Height with
Hood *
a consideration to a
snowfall
*(Field-Supplied)
NOTE:
Install the unit on a sunny place such as east or south
side of the building rather than north side.

4. Prevention of Short-circuiting

For prevention of short-circuiting between suction air
and discharge air, apply a field-supplied air discharge
hood
600~900 mm
300 mm
(Rear Side Space)
Seasonal Wind
Air Intake Side
(Rear)
Incorrect
Seasonal Wind
Air Discharge Hood
(Field-Supplied)
Max.500 mm
UNITS INSTALLATION
Correct
Windbreak Fence
Air Intake Side
(Rear)
Incorrect
Air Intake Side (Rear)
(In this case, defrosting time extends)
5. Dimensions of the Hood (Field-Supplied)
Following figures show the recommended dimensions of
air discharge hood and air intake hood for the outdoor
unit.
Apply steel plate of thickness 1mm for hood part, and of
thickness 1.6mm for flange part and stay part.
Apply steel plate with holes for hood part of air intake
hood.
Apply munsell code 2.5Y 8/2 beige color for painting the
hood.
Apply M5 tapping screws for fixing the hood.
Reinforce the hood with supports, if they are necessary
in consideration of the weather such as a strong wind.

Foundation Provision

Concrete Foundations
The height of the foundation should be 100~300mm
higher than the ground level.
Install a drainage around foundation for smooth drain.
When installing the outdoor unit, fix the unit by anchor
bolts.
Secure the outdoor unit with the anchor bolts.
When installing the unit on a roof or a veranda, drain
water sometimes turns to ice on a cold morning.
Therefore, avoid draining in an area that people often
use because it is slippery.
13
Seasonal Wind
Seasonal Wind