Onan CCKB User Manual

vibration isolators are for the engine end only and the
other two are for the generator end only. Use them for
their respective positions or undesirable cushioning
will result.
BATTERY CONNECTION
VENTILATION AND COOLING
Ventilation and cooling for outdoor installations
usually present no problems. Indoor installations,
however, require properly sized and located vents for
both inlet and outlet air. See Specifications section
for required airflow. The outlet should be slightly
higher than the inlet for convection airflow.
F^ovuie two 6 volt batteries connected in series
F ' 1 i !of a 12 volt source. See Specifications tor
n-irarnum battery ampere-hour rating.
Connect the battery positive (+) cable to the start
solenoid (located in the control box). Route the
battery cable through the rear of the control box.
Connect the battery negative (-) to a good ground on
the generator set frame. See Figures 1 and 3.
Do not disconnect starting batteries while set
is running. The resulting overvoltage condi¬
tion will damage electric choke and may damage control com¬
ponents.
Standby installations: If the installation is forstandby
service, install a double-throw transfer switch (either
manual or automatic) to prevent feeding generator
output into the normal power source lines and to also
preventcommercial powerand generator output from
being connected to the load at the same time.
GROUNDING
WARNING I prsvent shock hazard, ground the set.
Connect a #8 or larger wire between: (1) a
separate ground pipe or rod penetrating into moist earth; (2) and
the solderless connector located on the generator (on models not
so equipped, to the battery ground stud on the engine). See Figure
3.
The required amount of air must reach the unit,
absorb the heat and be discharged away from the
installation area. When determining vent sizes, con¬
sider the following:
1. Size of enclosure.
2. Ambient temperature.
3. Electrical load.
4. Running time.
5. Restrictions — screens, filters, etc.
6. Prevailing wind direction.
If the generating set is enclosed in a small, poorly
ventilated enclosure, auxiliary fans can be used to
increase airflow. The air inlet to the engine must not
exceed 120° F (49°C) when running atfullload. If inlet
air is more than 10°F (12°C) above ambient air, there
is a good possibility that cooling air is recirculating.
Pressure Cooling: These units need an inlet vent with
an unrestricted opening of 2-1/2 square feet (2.3 m^).
Install a separate duct from the engine for the
discharge air.
The discharge duct must be at least as large as the
inlet vent. If a screen is used in the duct, increase the
duct size proportionately to the screen restriction.
Use large radius elbows for bends and increase the
duct size for runs overSfeet (1.5 m). A canvas section
in the duct prevents transmission of vibration. A slight
pitch upward in the duct lets heat escape when the
unit is stopped and minimizes vapor lock.
Do not use discharged air for heating since it
may contain poisonous gases.
warningI
FIGURE 3. BATTERY AND GROUND CONNECTIONS
s

Onan CCKB Specifications

General

Engine Model	CCKB
Fuel Type	Gasoline
Cooling System	Air-cooled
Phase	Single-phase
Governor Type	Mechanical
Rated RPM	1800 RPM
Frequency	60 Hz
Ignition System	Battery Ignition
Starting System	Electric
Voltage	120/240 V
Rated Output	4.0 kW (5.0 kVA)
Maximum Output	5.5 kW
Oil Capacity	2 quarts
Generator Type	Revolving field
Fuel Consumption at Full Load	0.75 GPH
Fuel Consumption at Half Load	0.4 GPH