FNM® Series HPE – Installation Manual – 13
The size of the ventilation openings must be
multiplied by the number of engines installed.
The combustion air flow rate (for single engine) is shown in the
following table:
Engine
Intake air flow rate
[m
3
/min]
[ft
3
/min]
1.3HPE
8
282
1.9/2.4HPE
10
353
3.0HPE
12.5
424
The best temperature of operation of the engine is
between 30 and 40°C
. This temperature must be checked
after the installation, near the air inlet filter to the engine. For
this purpose, the minimum diameter of the ventilation openings
is indicated in the following table:
Engine
Dimension of the ventilation openings
Intake [cm
2
]
Exhaust [cm
2
]
1.3HPE
184 (28 in
2
)
80 (12 in
2
)
1.9/2.4HPE
230 (35 in
2
)
100 (16 in
2
)
3.0HPE
285 (45 in
2
)
125 (20 in
2
)
If it is not possible to reach an operating temperature within
the indicated range, or to improve the air inflow to the engine,
it is appropriate to increase the size of the ventilation
apertures.
Even with the increase in the size of the ventilation openings it
is not possible to return within the indicated range because of
weather conditions or the shape of the engine compartment, it
is necessary to check the difference between the outside
temperature and the engine compartment: this should never
be above 25°C.
Intake temperatures above 40°C can damage the
engine.
Failure to follow the instructions regarding the
dimensions of the openings and the operating
temperature compromises the engine reliability and
will void the warranty.
3.6
Installation angles
Refer to the table below for the maximum installation angles
and use of the engine.
Engine
Maximum
longitudinal angle
of continuous
operation (static
+
dynamic)[degrees
/360]
Maximum
transverse angle
of continuous
operation (static
+
dynamic)[degrees
/360]
Longitudin
al for
checking
the oil
level with
standard
dipstick
[degrees/3
60]
1.3HPE
± 20
± 25
0 ÷ +6
1.9/2.4/3.0
HPE
± 10
± 20
0 ÷ +6
Use the engine speed out of the ranges allowed may
constitute a serious failure of the production unit
because of the lack of oil in the pump and can lead
to engine damage.
Always check the oil level when the engine is in a
horizontal position, or within the limit indicated in the
table above.
