7.5 Compressor Room Ventilation
(1) Large amounts of heat are discharged from the
compressor as exhaust. Be sure to provide suffi-
cient ventilation. Amounts of heat generated from
the compressor are given in the table on the right.
Assuming the ventilation conditions of the setup
location, if the ambient temperature exceeds 40℃,
strong ventilation is required.
(2) Air intake hole must have an opening of larger than
1 square meter per each compressor to the place as
low as possible in the room. Air intake port must
face to the place where fine dust or other harmful
material in the ambient air are not taken into the
unit.
(3) Total ventilation
As the figure A, ventilation fan capacity in case of
ventilating the room in whole where the compres-
sor is installed, greater capacity than the recom-
mended ventilation fan capacity ① on the right
table is required. (However, it is under the condition
that the allowable temperature rise in the house is
5℃.) Place the ventilation fan on top of the room.
(4) Discharge air duct
● Based on the air exhaust capacity of the compres-
sor shown in the right table, calculate the resis-
tance of the air exhaust duct. If it is kept within 30
Pa, no need for an extra ventilation fan. In such
case, connect the duct directly to the exhaust air
port of the compressor as shown in the figure B.
The discharge air duct should be detachable struc-
ture, so that it will not hinder maintenance accessi-
bility.
● The air exhaust duct may transmit noise to the out-
doors. Carefully select, therefor, a position of the air
exhaust opening on the compressor room wall.
(As required, provide the air exhaust duct with
sound insulation liners or a silencer.)
● In case where pressure loss of the duct is greater
than 30 Pa, on consideration of such pressure loss,
a ventilation fan with the capacity larger than the
recommended quantity ② on the right table
should be installed inside the duct. According to
the discharged air temperature rise in the right
table, choose an appropriate ventilation fan.
In this case, do not connect the duct directly to the
exhaust air port of the compressor, but install a
hood at the entrance of the duct, and keep distance
h (h must be larger than the duct diameter)
between the duct and the port. (Figure C)
h
Figure
A
Figure
C
Figure
B
Ventilation fan
Refer to recommended
ventilation fan capacity
① on the table above.
Air exhaust
Air
intake
hole
Air exhaust
Air
intake
hole
This part must
be detachable.
Air
exhaust
duct
Air
intake
hole
Air exhaust
Ventilation fan
Refer to recommended
ventilation fan capacity
②
on the table above.
Air
exhaust
duct
Ventilation data
Model
Item
OSP-55VAN OSP-75VAN
Heat generation MJ/h 236 330
Air exhaust capac-
ity of compressor
m
3
/min 130 140
Discharged air
temperature
℃
Ambient temp.＋27 Ambient temp.＋35
Outside maximum
pressure loss
Pa
30 30
Recommended
ventilation fan
capacity ①
m
3
/min 623 873
Recommended
ventilation fan
capacity ②
m
3
/min 150 161
36
7. INSTRUCTIONS FOR INSTALLATION [Compressor Room Ventilation]
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