Specification Sheet

Performance you rely on.
TM
cumminsonan.com
©2013 Cummins Power Generation Inc. | NAS-5501c-EN (1/13)
Standard features
• Cummins Onan sound-attenuating enclosure
• Focalized mounting system with vibration isolators
• Cross-flow cooling
• Sheet steel drip controlling base
• Enclosed muffler
• Integral USDA Forest Service approved spark arrestor
muffler
• Adjustable mechanical governor
• Automatic choke
• Overhead cam
• Single-side service
• Low oil level shutdown
• Electric fuel pump (gasoline); electric solenoid (LP)
• Mounted control panel
• Sealed remote start connector
• Electric start
• Fused DC circuits to protect set wiring and remote
control wiring
• Magnetic circuit breaker
• 50 in (1.3 m) generator set output leads
• Solid-state ignition
• Standard onboard diagnostic capability
Engine details
Model: EX 21
Design: 4-cycle, single cylinder, OHC
Displacement: 13.2 in
3
(217 cm
3
)
Compression ratio: 8.5:1
Power: 7.0 bhp (max) at 3600 r/min
Cooling: Pressurized air
Cooling air volume: Includes engine cooling air
volume
60 Hz:
300 ft
3
/m (8.5 m
3
/min) at 3600 r/min
50 Hz:
250 ft
3
/m (7.1 m
3
/min) at 3000 r/min
Fuel system: (Gasoline) electric fuel pump, fuel lift 3 ft
(914 mm); (LP) electric fuel solenoid; automatic choke
Combustion air:
60 Hz:
12.5 ft
3
/m (0.35 m
3
/min) at 3600 r/min
50 Hz:
10.4 ft
3
/m (0.3 m
3
/min) at 3000 r/min
Ignition system: Breakerless, electronic
Starting system: Remote, 12 V, 3-wire negative
ground; start-stop rocker switch on control; connector for
remote start cable
Lubrication: Splash lubrication
Oil capacity: 0.6 qt (0.63 L)
Cylinder crankcase: Alloy aluminum with iron cylinder
liner cast into the block
Oil base: Aluminum
Cylinder head: Alloy aluminum, removable
Average fuel consumption
Gasoline No load Half load Full load
60 Hz
0.2 Gal/h (0.8 L/h) 0.4 Gal/h (1.3 L/h) 0.5 Gal/h (1.7 L/h)
50
0.2 Gal/h (0.6 L/h) 0.3 Gal/h (1.1 L/h) 0.4 Gal/h (1.4 L/h)
LPG No load Half load Full load
60 Hz
0.3 Gal/h (1.2 lb/h) 0.6 kg/h 0.4 Gal/h (1.6 lb/h) 0.7 kg/h 0.6 Gal/h (2.3 lb/h) 1.0 kg/h
50 Hz
0.2 Gal/h (1.0 lb/h) 0.4 kg/h 0.3 Gal/h (1.3 lb/h) 0.6 kg/h 0.4 Gal/h (1.8 lb/h) 0.8 kg/h
Alternator details
Design: Cummins 2-pole revolving field, self-excited,
electronically regulated, 1 phase, direct drive
Insulation system and temperature rise: Class H
insulation system meets ANSI/RVIA EGS-1 standards
and CSA TIL RV-06 temperature requirements
Cooling: Direct drive centrifugal blower
Rotor: Laminated electrical steel assembly press-fitted
to shaft, balanced, heavy insulated copper wire
windings, copper damper circuit for excellent waveform
Stator: Laminated electrical steel assembly; heavy
insulated copper wire windings
Voltage regulator: Electronic
DC brushes: Electrographite
Generator set performance
Air conditioner operation:
2.8kW generator set will start and run one 13500 Btu high
efficiency air conditioner(15.5 Amps or less) plus 600 watt
base load with an additional 300 watts of power available.
2.5kW generator set will start and run one 13500 Btu high
efficiency air conditioner (15.5 Amps or less) plus a 600
watt base load with no additional watts of power available.
2.3kW generator set will start and run one 7800 Btu high
efficiency air conditioner(5.5 Amps or less) plus 600 watt
base load with an additional 100 watts of power available.
Voltage regulation: Exceeds requirements of
ANSI/RVIA EGS-1 ±10%
Frequency regulation: Exceeds requirements of
ANSI/RVIA EGS-1 ± 5%
Note:
See your Cummins Onan distributor or certified Cummins Onan
service dealer for a listing of approved air conditioners
.