Hitachi NEXT Series Instruction Manual page 50

5. INSTALLING AND PIPING THE DSP [Ventilation of Air Compressor Room]
CAUTION
When installing exhaust ducts, install a single
duct for each compressor. Alternatively, when
installing a collecting duct for multiple
compressors, install it as shown in Fig. C.
Also, be sure to install a ventilating fan with a
capacity of the value of "exhaust air from the
compressor x quantity" or more on the other
end of the duct.
48
5.5.2 Water-Cooled Type
① For the small air compressor room installation, install
a ventilating fan and an air intake opening. The
position of the ventilating fan is as high as possible
and the position of the air intake opening is as low as
possible on the wall.
Select a ventilating fan with required capacity
specified in the table or higher (Fig. A). Also ensure
that the flow rate at the air intake opening is 2 m/s or
lower.
② For the factory installation with enough ventilation
capacity, select a well ventilated area (Fig. B).
Technical Data for Room Ventilation
Model
Item/Unit
KBTU
Heat
generation
(MJ/h)
cfm
Recommended
fan capacity
①
/min)
(m 3
Note
The specified capacity is based on the allowable room
temperature rise of 9℉ (5℃) and stafic pressure os zero (0)
psi (MPa).
Ventilating fan
See "Recommended
fan capacity" in the
table
Exhaust air
Air inlet
Fresh
air
Fig. A
Exhaust air
Air inlet
Fresh
air
Fig. B
Water-Cooled
55WTN 75WTN
45WTN
55VWTN 75VWTN
26 27 35
(27) (28) (37)
2650 2830 3530
(75) (80) (100)
Exhaust
air
Exhaust
air