Residential generator set
RS Air-Cooled Series
RS20A/AC & RS14AF
Model GSBB
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Electronic governor for precise frequency control
Flexible 12 inch fuel line provided with genset
Generator designed and manufactured in the USA
U.S. EPA and CARB Emissions Certified
UL 2200 Listed and CSA Certified generator and
transfer switch for your protection
• Quality power output, less than 5% THD
• 5 year, 2000 hour limited warranty
Features and benefits
• Very quiet operation
• Internet remote monitoring and email notification
• Automatic load management - The intelligent
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generator control automatically manages nonessential household loads for maximum utilization of
generator power
Cummins Onan designed alternator and electronic
control
Powerful motor starting - starts and runs a 5 ton A/C¹
under full pre-load
GFCI “Ready”
Self-diagnostic capability
Service and maintenance information displayed on in
home display
Easy installation with innovative molded polymer
installation base - no need for a concrete pad
Weight, size and sound level
Weight: 540 lb (245 kg)
Size: Length 53 in (1346 mm), width 43 in (1092 mm),
height 34.7 in (880 mm)
Sound: 62 dB(A) at 23 ft (7 m) at normal load²
Series
Order model
Part
number
Voltage
Frequency
Rated amps³
LPV fuel
Rated amps³
NG fuel
Circuit
breaker
Cold weather
equipped
RS20A
20GSBB-6713A
A029T463
120/240
60 Hz
162.5/81.25
144/72
100 A, 2 pole
No
UL, EPA
RS20A
20GSBB-6714A
A029U509
120/240
60 Hz
162.5/81.25
144/72
100A, 2 pole
Yes
UL, EPA
Certification
RS20A
20GSBB-6719A
A034E556
120/240
60 Hz
162.5/81.25
144/72
100A, 2 pole
No
UL, CARB
RS20A
20GSBB-6720A
A035C273
120/240
60 Hz
162.5/81.25
144/72
100 A, 2 pole
Yes
UL, CARB
RS20AC 20GSBB-6717A
A030S533
120/240
60 Hz
154/77
140/70
100A, 2 pole
Yes
CSA, EPA
RS14AF 14GSBB-6716A
A029U513
115/230
50 Hz
118/59
118/59
60A, 2 pole
No
None
¹
²
³
Air-conditioners vary by type, efficiency, operational conditions, etc. Consult with a qualified HVAC specialist or Cummins Onan distributor/dealer for proper sizing.
Normal load is defined as typical household consumption of 3kW.
Derating guidelines: Maximum wattage or maximum current are subject to and limited by such factors as fuel Btu content, ambient temperature, altitude, engine power and condition, etc. Ful
rated power available at 60 oF (15.5oC) and sea level. Derate 3.5% for each 1000 ft (304.8 m) above sea level and 3% for each 10 oF (5.5 oC) increase in ambient temperature above 60 oF
o
(15.5 C). Maximum wattage or maximum current are based upon minimum service voltage in accordance with UL 2200 (Stationary Engine Generator Assemblies) or CSA C22.2 No. 100-04
(Motors and Generators).
Cummins®, Onan®, the "C" logo and Performance you rely on.TM are servicemarks, trademarks
and/or registered trademarks of Cummins Inc Other company, product or service names may be
trademarks or service marks of others. Specifications are subject to change without notice.
©2010 Cummins Power Generation. All Rights Reserved.
A-1555c (12/10)
Engine
Control system
Model: 993 cc, air-cooled v-twin OHV
Compression ratio: 8.3:1
• Cummins Proprietary electronic control with self
Displacement: 60.6 cu in (993 cc)
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Oil sump capacity: 2.43 qt (2.3 L) with filter
Operating speed: 3600 rpm
Fuel supply pressure: NG 5-11 in H2O, LP 7-11 in H2O
• Integrated oil drain valve and extension tube included
• Simple fuel conversion between natural gas and LP
• 20 A battery charger
• Highly reliable solenoid shift starter
• Transistorized magneto ignition
• Automotive-style lubrication system
• Oil cooler
• Spin-on oil filter
• Electronic governor
• Large-capacity air cleaner
• CARB Certified and U.S. EPA Certified models available
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diagnostics and generator set protection and safety
features included
Automatically starts and stops generator upon
identification of a power outage
Microprocessor control manages generator set operation,
fault detection and service diagnostics
Illuminated run/off/auto switch
Convenient access to all connection points
Fully automatic operation
Internet/email capability
Weather protective sound enclosure
• Thick 11 gauge aluminum enclosure with resilient
architectural grade powder coat paint
• Durable polypropylene base eliminates need for concrete
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pad
UL Listed, impact resistant, fully colored, automotive
grade polypropylene cover with UV stabilizer
All maintenance points are accessible without the use of
tools
“Under the hood” oil dipstick check and fill
Electrical stub-up and side knockouts provided on genset
for installation flexibility
Patented, innovative, compact and neighborhood friendly
design blends into any residential setting
Lift-off enclosure for close proximity installations
No exposed fasteners
Key lockable
High intake and exhaust to reduce rain ingestion and
snow blockage
GFCI “Ready” mounting location provided on genset
enclosure
Externally mounted circuit breaker with weatherproof
cover
Exhaust muffler
• Large automotive grade corrosion resistant muffler
design
• Low noise
Load management
• Automatically turns on/off loads to prevent generator
overload
• Easy to set up from in-home display
• Easily connected at the generator
Note: Additional installation and relays are required.
Cummins®, Onan®, the "C" logo and Performance you rely on.TM are servicemarks, trademarks
and/or registered trademarks of Cummins Inc Other company, product or service names may be
trademarks or service marks of others. Specifications are subject to change without notice.
©2010 Cummins Power Generation. All Rights Reserved.
A-1555c (12/10)
• Sends you or your service technician an email if service or
maintenance is required.
• View generator status from the internet.
Note: Network Specialist required for set-up
• Installation and set-up is required. See Installation Manual
for additional details.
In-home display
• Wired in-home LCD display is offered standard on every
set.
• Surface mountable at genset (standard) or remotely
(installation required).
• Power continually supplied to the display; no need for
replaceable batteries.
• Genset can be started/stopped from the display.
• Easily set/adjust genset exercise for day and time, with
capability to choose weekly, bi-weekly or monthly.
Displays maintenance and service reminders.
Percent load is displayed allowing user to manage load.
Displays last 30 faults for troubleshooting.
Displays last 30 events (i.e., day and time of power
outage, exercise, etc.).
• Adjust and configure RSS service entrance ATS models.
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Average fuel
consumption:*
Fuel consumptionnatural gas
Load:
1/4
1/2
3/4
Full
ft /hr
90
135
m³/hr
2.5
3.8
Kg/hr
2.5
3.4
Btu/hr
90000
135000
3
3
Nominal fuel rating - 37 MJ/m (1000 Btu/ft ).
175
5.0
4.8
175000
240
6.8
6.6
240000
Load:
3/4
Full
Conversion factor
75
2.1
2.1
7.8
5.7
187500
110
3.1
3.0
11.4
7.9
275000
8.58 ft = 1 lb
3
0.535 m = 1kg
3
36.39 ft = 1 Gal
3
Fuel consumptionLP vapor
1/4
1/2
3
35
53
ft /hr
m³/hr
1.0
1.5
Gal/h:
1.0
1.5
L/hr
3.6
5.5
Kg/hr
2.5
3.8
Btu/hr
87500
132500
3
3
Nominal fuel rating - 93 MJ/m (2500 Btu/ft ).
3
* Approximately 15% lower fuel consumption at 50 Hz
Alternator details
Generator set performance
Design: Cummins Onan 2-pole, self-excited revolving
field. Permanently aligned to engine by a tapered shaft.
AC waveform total harmonic distortion: Less than
5% THD (total harmonic distortion).
Insulation system and temperature rise: Class H
insulation per NEMA MG-1-1-66.
Cooling: Direct-drive, centrifugal blower.
Rotor: Laminated electrical steel assembly skewed for
improved voltage waveform, heavy insulated copper wire
windings.
Bearing: Double-sealed pre-lubricated ball bearing.
Voltage regulation: ±1.5% no load to full load.
Frequency regulation: Isochronous, 0% no load to
full load.
Motor starting kVA (30% voltage dip): 40
Operating temperature:
DC brushes: Electrographitic, long life, easily serviced.
122 ºF (50 ºC) to 20 ºF (-7 º C): Standard Model
122 ºF (50 ºC) to 0 ºF (-18 ºC): Cold Weather
Equipped Model
Additional accessories are available to allow for
operation down to -20 ºF (-29 ºC) or high humidity.
See Accessories section for details.
Easy Service & Installation
Removable
Lid
Air cleaner
LP/NG Fuel
Connection
Plug-n-Play Electrical
Connections
Oil Check/Fill
Cummins®, Onan®, the "C" logo and Performance you rely on.TM are servicemarks, trademarks
and/or registered trademarks of Cummins Inc Other company, product or service names may be
trademarks or service marks of others. Specifications are subject to change without notice.
©2010 Cummins Power Generation. All Rights Reserved.
A-1555c (12/10)
Polypropylene
Mounting Base
Oil Drain
Valve
Automatic transfer panel configurations
Service entrance installation (USA
only) (100/200 A)
Service entrance installation (USA
and Canada) (100/200 A)
Dedicated emergency standby
service system (100/200 A) (USA
and Canada)
Basic dimensions
Note: This outline drawing (A029Z911) is provided for general reference only and is not intended for use in design or installation.
For more information, see Operators and Installation manuals or contact your distributor or dealer for assistance.
Cummins®, Onan®, the "C" logo and Performance you rely on.TM are servicemarks, trademarks
and/or registered trademarks of Cummins Inc Other company, product or service names may be
trademarks or service marks of others. Specifications are subject to change without notice.
©2010 Cummins Power Generation. All Rights Reserved.
A-1555c (12/10)
UL 1008 Listed: RSS100-6868, RSS200-6869 (0500-4824)
CSA/UL RSS100-6634 (0500-4502)
Cummins®, Onan®, the "C" logo and Performance you rely on.TM are servicemarks, trademarks
and/or registered trademarks of Cummins Inc Other company, product or service names may be
trademarks or service marks of others. Specifications are subject to change without notice.
©2010 Cummins Power Generation. All Rights Reserved.
A-1555c (12/10)
CSA/UL RSS200-6635 (0500-4503)
Options and accessories
Transfer switch (also sold separately)
- Installation wheel kit (P/N 0541-1624)
- Additional in-home display (P/N 0300-6576)
Climate Accessories:
- Breather heater kit (P/N A030W752)
- Battery heater kit (P/N 0333-0770)
- Alternator dryer kit (P/N A029J885)
Climate
Below 0 ºF
Below -10 ºF
High Humidity
Breather
Heater
X
X
Battery
Heater*
Alternator
Dryer
Plug-n-play installation harnesses
X
X
* A battery with higher CCA can be used in place of this
accessory.
Battery requirement
- 12 V, group 26R, 530 CCA Maintenance Free
Warranty policy
Cummins Onan RS20A, RS20AC, and 14AF generators
come standard with a 5 year/2000 hour limited warranty.
Extended warranty options available. See warranty
statement for additional details.
!
IMPORTANT
Standby rating based on: Applicable for
supplying emergency power for the duration of
normal power interruption. No sustained
overload capability is available for this rating.
(Equivalent to fuel stop power in accordance
with ISO3046, AS2789, DIN6271 and BS5514.)
nominally rated. See T030.
!
- 100 and 200 amp automatic transfer switch NEMA 3R.
- Fully automatic operation with Cummins Onan RSS model
automatic transfer switch.
- Reduces installation time with indoor/outdoor flexibility and
whole house install.
- Two amp trickle battery charger included
- UL 1008 Listed Service Entrance Rated: RSS100-6868,
RSS200-6869
- CSA Approved and UL 1008 Listed: RSS100-6634,
RSS200-6635
WARNING:
Back feed to a utility system can cause
electrocution and/or property damage. Do not
connect to any building electrical except
through an approved device or after building
main breaker is open.
- Generator to ATS harness:
• 1 ft. length (p/n A029U298)
• 50 ft. length (p/n A029U302)
• 100 ft. length (p/n A029U303)
• 200 ft. length (p/n A029U304)
- Remote display harness:
• 1 ft. length (p/n A029U306)
• 50 ft. length (p/n A029U308)
• 100 ft. length (p/n A029U310)
• 200 ft. length (p/n A029U311
After sale support
Largest distributor/dealer support network
Cummins Onan generator sets are supported by the largest
and best trained worldwide certified distributor/dealer
network in the industry. This network of knowledgeable
distributor/dealers will help you select and install the right
generator set and accessories to meet the requirements of
your specific application. This same network offers a
complete selection of commonly used generator set
maintenance parts, accessories and products plus manuals
and specification sheets. Plus, they can answer your
questions regarding proper operation, maintenance
schedules and more.
Manuals: Operation and installation manuals ship with the
generator set. To obtain additional copies or other manuals
for this model, see your distributor/dealer and request the
following manual numbers: Operator (A029V089),
Installation (A029V088)) Parts (A029Y325), Service
(A030A239).
To easily locate the nearest certified distributor/dealer for
Cummins Onan generators in your area, or for more
information, contact us at 1-800-344-0039 or visit
www.cumminsonan.com.
Contact your distributor/dealer for more information.
Cummins Power Generation
1400 73rd Ave. NE
Minneapolis, MN 55432 USA
Toll-free 1 800 344-0039
Fax 1 763 574 5298
Email www.cumminsonan.com/contact
www.cumminsonan.com
Cummins®, Onan®, the "C" logo and Performance you rely on.TM are servicemarks, trademarks
and/or registered trademarks of Cummins Inc Other company, product or service names may be
trademarks or service marks of others. Specifications are subject to change without notice.
©2010 Cummins Power Generation. All Rights Reserved.
A-1555c (12/10)