Onan 25.0 DEH-53R Series Operator's Manual And Parts Catalog page 15

INSTALLATION
GENERAL
Installations must be considered individually. Use
these instructions as a general guide. All installations
must meet regulations of state and local building
codes, fire ordinances, etc., which may affect installa-
tion details. See Figure 7.
Requirements to be considered prior to installation:
1. Level mounting surface.
2. Adequate cooling air.
3. Adequate fresh induction air.
4. Discharge of circulated air.
5. Discharge of exhaust gases.
6. Electrical connections.
7. Fuel installation.
8. Water supply (city water cooling).
9. Accessibility for operation and servicing.
10. Vibration isolation.
11. Noise levels.
LOCATION
Provide a location that is protected from the weather
and is dry, clean, dust free and well ventilated. If
practical, install inside a heated building for protec-
tion from extreme weather conditions.
Radiator set cooling air travels from the rearof the set
and is removed by a pusher fan which blows out
through the radiator. Locate the air inlet to the rear of
the set. Make the inlet opening at least IVfe-times
larger than the radiator.
Locate the cooling air outlet directly in front of the
radiator and as close as possible. The opening size
should be at least as large as the radiator area. Length
and shape of the air outlet duct should offerminimum
restriction to air flow. Use a duct of canvas or sheet
metal between the radiator and the airoutlet opening.
The duct prevents recirculation of heated air.
Provide a means of restricting the air flow in cold
weather to keep the room or compartment
temperature at a normal point.
For operation outside a building, a shelter housing
with electrically operated louvres is available as an
option. Transformers connected across the generator
output supply current to the motors.
When the generator is operating, current in the
transformers actuate the motors and open the
louvres. The louvres are held open for the duration of
the set operation, then are closed by return springs
when the set is shut down.
MOUNTING
Generator sets are mounted on a rigid skid base
which provides proper support. The engine-
generator assembly is isolated from the skid base by
rubber mounts which provide adequate vibration
isolation for normal .installations. For installations
where vibration control is critical, install additional
spring-type isolators between skid base and founda-
tion.
For convenience in general servicing and changing
crankcase oil, mount set on raised pedestal at least 6-
inches (150 mm) high. Refer to ONAN Technical
Bulletin T-030 for further installation information.
VENTILATION
Generator sets create considerable heat which must
be removed by proper ventilation. Outdoor in-
stallations rely on natural air circulation but indoor
installations need properly sized and positioned vents
for the required air flow. See SPECIFICATIONS for
the air required to operate with rated load under
normal conditions at 1800 r/m.
City water cooled sets do not use the conventional
radiator. A constantly changing water flow cools the
engine. Ventilation is seldom a problem, but sufficient
air movement and fresh air must be available to
properly cool the generator, disperse heat convected
off the engine and support combustion in the engine.
For small compartments, a duct of equal or larger area
than generator outlet is recommended to remove the
heated air from the generator air outlet to the outside
atmosphere. Limit bends and use radius type elbows
where needed. A larger, well ventilated compartment
or room does not require a hot air duct.
Installations made in a small room may require
installation of an auxiliary fan (connected to operate
only when the unit is running) of sufficient size to
assure properaircirculation and evacuation of fumes.
13