Briggs & Stratton 30000 Series Installation and operation manual

Installation & Start-Up Manual
30000 Series
Liquid-Cooled
Home Generator System
Manual No. 205052GS Rev. A (01/08/2008)

Thank you for purchasing this quality-built Briggs & Stratton home generator. We’re pleased that you’ve placed your
confidence in the Briggs & Stratton brand. When operated and maintained according to the instructions in the operator’s
manual, your Briggs & Stratton home generator will provide many years of dependable service.
This manual contains safety information to make you aware of the hazards and risks associated with home generator systems
and how to avoid them. This home generator system is designed and intended only for use as an optional home standby
system that provides an alternate source of electric power and to serve loads such as heating, refrigeration systems, and
communication systems that, when stopped during any power outage, could cause discomfort or inconvenience. This product
is not intended for any other purpose and does not qualify for emergency standby as defined by NFPA 70 (NEC).
This home generator requires professional installation before use. This installation manual provides full information. Follow
the instructions completely. Save these instructions for future reference.
Where to Find Us
You never have to look far to find Briggs & Stratton support and service for your generator. Consult your Yellow Pages.
There are thousands of Briggs & Stratton authorized service dealers worldwide who provide quality service. You can
also contact Briggs & Stratton Customer Service by phone at [phone], or use the Service Center Locator at
BRIGGSandSTRATTON.COM, which provides a list of Briggs & Stratton Authorized Dealers.
Date of Purchase
Generator
Model Number
Model Revision
Serial Number
Engine
Model Number
Serial Number
Briggs & Stratton Power Products Group, LLC
900 North Parkway
Jefferson, WI 53549
Copyright © 2008 Briggs & Stratton Power Products Group, LLC.
All rights reserved. No part of this material may be reproduced or
transmitted in any form by any means without the express written
permission of Briggs & Stratton Power Products Group, LLC.

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3
Table of Contents
SafetyRules...................................4
Installation....................................7
InstallerResponsibilities .......................................7
DeliveryInspection............................................7
ShipmentContents............................................7
HomeGeneratorLocation......................................8
AccessDoors...............................................10
TheGaseousFuelSystem.....................................10
FuelConsumption ...........................................12
SystemConnectors..........................................13
GroundingtheGenerator......................................14
UtilityCircuitConnection......................................14
SystemControlPanel.........................................15
Final Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
FuelSupplySystem..........................................16
InitialStart-up(NoLoad)......................................16
FuelConversion.............................................16
Schematic/WiringDiagram ....................................18
Controls..................................... 19
Operation.................................... 19
Automatic Operation Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SettingExerciseTimer........................................19
InstallationInspection........................................19

4 BRIGGSandSTRATTON.COM
Safety Rules
The safety alert symbol ( ) is used with a signal word
(DANGER, CAUTION, WARNING), a pictorial and/or a safety
message to alert you to hazards. DANGER indicates a hazard
which, if not avoided, will result in death or serious injury.
WARNING indicates a hazard which, if not avoided, could
result in death or serious injury. CAUTION indicates a hazard
which, if not avoided, might result in minor or moderate
injury. NOTICE indicates a situation that could result in
equipment damage. Follow safety messages to avoid or
reduce the risk of injury or death.
This manual contains installation, startup and adjustment
instructions for a home generator that supplies 120/240 Volt,
single phase, 60Hz devices. The home generator may be
operated on LP vapor or natural gas fuel. Separate engine
and generator operator’s manuals are supplied that contain
operating and maintenance instructions for this system.
Every effort has been made to ensure that the information
in this manual is both accurate and current. However, the
manufacturer reserves the right to change, alter or otherwise
improve the system at any time without prior notice.
Hazard Symbols and Meanings
WARNING
Storage batteries give off explosive hydrogen
gas during recharging.
Slightest spark will ignite hydrogen and cause
explosion.
Battery electrolyte fluid contains acid and is
extremely caustic.
Contact with battery contents will cause severe
chemical burns.
A battery presents a risk of electrical shock and
high short circuit current.
DO NOT dispose of battery in a fire.
DO NOT allow any open flame, spark, heat, or lit cigarette
during and for several minutes after charging a battery.
DO NOT open or mutilate the battery.
Wear protective goggles, rubber apron, and rubber
gloves.
Remove watches, rings, or other metal objects.
Use tools with insulated handles.
•
•
•
•
•
•
WARNING
Running engine gives off carbon monoxide, an
odorless, colorless, poison gas.
Breathing carbon monoxide can cause
headache, fatigue, dizziness, vomiting,
confusion, seizures, nausea, fainting or death.
Operate generator ONLY outdoors.
Install a battery operated carbon monoxide alarm near
the bedrooms.
Keep exhaust gas from entering a confined area through
windows, doors, ventilation intakes, or other openings.
•
•
•
WARNING
The engine exhaust from this product contains chemicals
known to the State of California to cause cancer, birth
defects, or other reproductive harm.
Save These Instructions
Explosion Fire Electrical Shock
Rotating Parts Hot Surface Toxic Fumes
Chemical BurnExplosive PressureAuto Start
Lift Hazard Read Manual

5
WARNING
Generator produces hazardous voltage.
Failure to properly ground generator can result
in electrocution.
Failure to isolate generator from power utility
can result in death or injury to electric utility
workers due to backfeed of electrical energy.
When using generator for backup power, notify utility
company.
DO NOT touch bare wires or receptacles.
DO NOT handle generator or electrical cords while
standing in water, while barefoot, or while hands or feet
are wet.
If you must work around a unit while it is operating,
stand on an insulated dry surface to reduce shock
hazard.
DO NOT allow unqualified persons or children to operate
or service generator.
In case of an accident caused by electrical shock,
immediately shut down the source of electrical power
and contact the local authorities. Avoid direct contact
with the victim.
Despite the safe design of the home generator, operating
this equipment imprudently, neglecting its maintenance
or being careless can cause possible injury or death.
Remain alert at all times while working on this
equipment. Never work on the equipment when you are
physically or mentally fatigued.
Before performing any maintenance on the generator,
disconnect the battery cable indicated by a NEGATIVE,
NEG or (-) first. When finished, reconnect that cable last.
After your home generator is installed, the generator
may crank and start without warning any time there is
a power failure. To prevent possible injury, always set
the generator’s system switch to OFF AND remove the
15 Amp fuse BEFORE working on the equipment.
•
•
•
•
•
•
•
•
•
•
WARNING
Propane and Natural Gas are extremely
flammable and explosive.
Fire or explosion can cause severe burns or
death.
Install the fuel supply system according to applicable
fuel-gas codes.
Before placing the home generator into service, the fuel
system lines must be properly purged and leak tested.
After the generator is installed, you should inspect the
fuel system periodically.
NO leakage is permitted.
DO NOT operate engine if smell of fuel is present or other
explosive conditions exist.
DO NOT smoke around the generator. Wipe up any oil
spills immediately. Ensure that no combustible materials
are left in the generator compartment. Keep the area near
the generator clean and free of debris.
•
•
•
•
•
•
WARNING
Hazardous Voltage
Contact with power lines can cause electric
shock or burn.
Lifting Hazard / Heavy Object
Can cause muscle strain or back injury.
DO NOT contact any power lines when using required
lifting/hoisting equipment.
DO NOT lift or move generator without assistance.
Use lifting pipes or straps as described in Lifting the
Generator. The unit may shift during movement, which
can cause injury.
DO NOT lift unit by roof as damage to generator will
occur.
•
•
•
•

6 BRIGGSandSTRATTON.COM
WARNING
Contact with muffler area can result in serious
burns.
Exhaust heat/gases can ignite combustibles or
structures causing a fire.
DO NOT touch hot parts and AVOID hot exhaust gases.
Allow equipment to cool before touching.
DO NOT install the generator closer than 5 feet (1.5m)
from any combustibles or structures with combustible
walls having a fire resistance rating of less than 1 hour.
Code of Federal Regulation (CFR) Title 36 Parks, Forests,
and Public Property require equipment powered by an
internal combustion engine to have a spark arrester,
maintained in effective working order, complying to
USDA Forest service standard 5100-1C or later revision.
In the State of California a spark arrester is required
under section 4442 of the California Public resources
code. Other states may have similar laws.
•
•
•
•
WARNING
Starter and other rotating parts can entangle
hands, hair, clothing, or accessories.
NEVER operate generator without protective housing or
covers.
DO NOT wear loose clothing, jewelry or anything that
may be caught in the starter or other rotating parts.
Tie up long hair and remove jewelry.
•
•
•
CAUTION
Excessively high operating speeds increase risk of injury
and damage to generator.
Excessively low speeds impose a heavy load.
DO NOT tamper with governed speed. Generator supplies
correct rated frequency and voltage when running at
governed speed.
DO NOT modify generator in any way.
•
•
NOTICE
Exceeding generators wattage/amperage capacity can
damage generator and/or electrical devices connected to
it.
See Essential Circuits in Operator’s manual.
Start generator and let engine stabilize before connecting
electrical loads.
•
•
NOTICE
Improper treatment of generator can damage it and
shorten its life.
Use generator only for intended uses.
If you have questions about intended use, ask dealer or
contact Briggs and Stratton.
Operate generator only on level surfaces.
Adequate, unobstructed flow of cooling and ventilating
air is critical to correct generator operation.
The Coolant Fill, Battery and Control Panel doors must be
installed whenever the unit is running.
DO NOT expose generator to excessive moisture, dust,
dirt, or corrosive vapors.
Despite the safe design of the home generator, operating
this equipment imprudently, neglecting its maintenance or
being careless can cause possible injury or death.
DO NOT start engine with air cleaner or air cleaner cover
removed.
DO NOT insert any objects through cooling slots.
DO NOT use the generator or any of its parts as a step.
Stepping on the unit can cause stress and break parts.
This may result in dangerous operating conditions from
leaking exhaust gases, fuel leakage, oil leakage, etc.
If connected devices overheat, turn them off and
disconnect them from generator.
Shut off generator if:
-electrical output is lost;
-equipment sparks, smokes, or emits flames;
-unit vibrates excessively.
•
•
•
•
•
•
•
•
•
•
•
•

7
Installation
Equipment Description
This product is intended for use as an optional home
generator system which provides an alternate source
of electric power and to serve loads such as heating,
refrigeration systems, and communication systems that,
when stopped during any power outage, could cause
discomfort or inconvenience. This product does not qualify
for emergency standby as defined by NFPA 70 (NEC).
Customer Responsibilities
• Read and follow the instructions given in the Operator’s
Manual, especially the section regarding selecting
essential circuits.
• Follow a regular schedule in maintaining, caring for
and using your home generator, as specified in the
Operator’s Manual.
Installer Responsibilities
• Read and observe the safety rules.
• Install only an UL approved transfer switches that is
compatible with the home generator.
• Read and follow the instructions given in this
Installation and Start-up Manual.
IMPORTANT: The system is equipped with a water heater
that is activated when ambient temperature is less than 80°F
AND utility power is present at the transfer switch.
Unpacking Precautions
The unit is shipped ready for installation on a prepared
reinforced cement slab or engineered base. Avoid damage
from dropping, bumping, collision, etc. Store and unpack
carton with the proper side up, as noted on the shipping
carton.
Delivery Inspection
After removing the carton, carefully inspect the home
generator for any damage that may have occurred during
shipment.
IMPORTANT: If loss or damage is noted at time of delivery,
have the person(s) making delivery note all damage on the
freight bill and affix his signature under the consignor’s
memo of loss or damage. If loss or damage is noted after
delivery, separate the damaged materials and contact the
carrier for claim procedures. Missing or damaged parts are
not warranted.
Shipment Contents
The home generator system is supplied with:
• Home generator
• Fully-serviced coolant system
• Fully-serviced oil/lubricating system
• UL569/CSA8.3-listed flexible fuel hook-up
• Installation and start-up manual
• Operator’s manual
• Engine operator’s manual
• Installation checklist
• Two access door keys
• One spare 15A fuse
• 10 Pole control panel connector
• Remote LED indicator kit (red LED/plate/screws)
Not Supplied:
• 650 CCA starting battery (NOT deep-cycle)
• Connecting wire and conduit
• Fuel supply valves/plumbing
Required Specialty Tools/Equipment
• Two 60” lengths of 2” Schedule 40 pipe (NOT conduit)
• Lifting straps, chains or cables
• Hole punches for 7 ga steel
• Torque screwdriver, 5 to 50 inch-pound range
• Ignition Timing Light
• Air Fuel Ratio Meter (O2 Sensor and Analyzer)

8 BRIGGSandSTRATTON.COM
Home Generator Location
Before installing generator, consult with homeowner and convey
the following guidelines which may affect the desired location.
WARNING
Exhaust heat / gasses can ignite combustibles
or structures causing a fire.
DO NOT install the generator closer than 5 feet (1.5m)
from any combustibles or structures with combustible
walls having a fire resistance rating of less than 1 hour.
•
Generator Location
Install generator outdoors in an area which will not
accumulate deadly exhaust gas. DO NOT install generator
where exhaust gas could accumulate and enter inside or be
drawn into a potentially occupied building. Ensure exhaust
gas is kept away from any windows, doors, ventilation intakes
or other openings that can allow exhaust gas to collect in a
confined area. Prevailing winds and air currents should be
taken into consideration when positioning generator.
WARNING
Running engine gives off carbon monoxide, an
odorless, colorless, poison gas.
Breathing carbon monoxide can cause
headache, fatigue, dizziness, vomiting,
confusion, seizures, nausea, fainting, or death.
Operate generator ONLY outdoors.
Install a battery operated carbon monoxide alarm near
the bedrooms.
Keep exhaust gas from entering a confined area through
windows, doors, ventilation intakes, or other openings.
•
•
•
General Location Guidelines
• Install the unit outdoors ONLY.
• Place the unit on a prepared concrete slab that is flat,
level, and has provisions for water drainage.
• Install the unit in a location where sump pump
discharge, rain gutter down spouts, roof run-off,
landscape irrigation, or water sprinklers will not flood
the unit or spray the enclosure and enter any air inlet or
outlet openings.
• Install the unit where the location of any services such
as phone, electrical, fuel, air conditioning, irrigation,
including covered, concealed and underground services
will not be affected or obstructed.
• Install the unit where air inlet and outlet openings will
not become obstructed by leaves, grass, snow, etc. If
prevailing winds will cause blowing or drifting, you may
need to construct a windbreak to protect the unit.
• Install the generator as close as possible to the transfer
switch and fuel supply to reduce the length of wiring,
conduit, and piping.
IMPORTANT: Laws or local codes may regulate the distance
to the fuel supply.
The Minimum clearances from aerial view of generator (A) to
combustible (C, D) materials is shown below.
• These distances are provided to give generator location
guidance relative ONLY to combustibles, generator
cooling, and maintenance.
• The minimum distances in the figure are as shown.
All four sides of the generator cannot be enclosed
or restricted, even if the minimum distances are
maintained. DO NOT connect (C) to (D)
• A roof cannot be used.
• Exhaust (B) is directed out the top of the generator and
must not be allowed to accumulate.
A Home Standby Generator
B Engine Exhaust (exits vertically from enclosure)
C Combustible Material or Structure with a Fire
Resistance Rating of less than 1 hour.
D Any structure or material. DO NOT connect (C) to (D).
A
D
C
D
B
5’ (1.5m)
5’ (1.5m) 5’ (1.5m)
5’ (1.5m)

9
Concrete Slab
At the appropriate location, construct a concrete slab (28 day
compression strength of 3000 psi (200 MPa)) minimum
5 inches thick and 6 inches wider than the enclosure on
all sides. Strengthen slab with No. 6 reinforcing bars (on
12” centers) or 8 ga. steel wire fabric (6” centers). Avoid
placing reinforcement in entrance stub-up area.
Attach unit to slab with 5/16” diameter (minimum) masonry
anchor bolts long enough to retain the unit.
Electrical and Fuel Inlet Locations
A through-slab power cable stub-up is preferred (see above).
If stub-up’s are not used, (A) indicates the recommended
location for punching holes for attaching power conduit. The
fuel inlet connector (B) is shown for reference.
Lifting the Generator
The generator weighs more than 1,700 pounds. Proper tools,
equipment and qualified personnel should be used in all
phases of handling and moving the generator.
WARNING
Hazardous Voltage
Contact with power lines can cause electric
shock or burn.
Lifting Hazard / Heavy Object
Can cause muscle strain or back injury.
DO NOT contact any power lines when using required
lifting/hoisting equipment.
DO NOT lift or move generator without assistance.
Use lifting pipes or straps as described in Lifting the
Generator. The unit may shift during movement, which
can cause injury.
DO NOT lift unit by roof as damage to generator will
occur.
•
•
•
•
Two 60” lengths of 2” Schedule 40 pipe (B), supplied by the
installer, are required to lift the generator onto cement pad.
Insert pipes through the lifting holes (A) located near the
unit’s base.
Use a spreader bar to ensure that the chains, straps or
cables DO NOT touch the generator’s roof.
B
A
49”
14.25”
94”
78”
38”
9.5”
7” 7.38”
34.25”
10.5”
8”
Power Cable
Stub-in
location
Fuel Inlet
Port
Enclosure
Base
Slab Top VIew
Exhaust
Opening
(shown for
reference)
Anchor bolt
position
(4 places)
B
A
1” Female NPT

10 BRIGGSandSTRATTON.COM
Access Doors
The home generator is equipped with an enclosure that has
three access doors, as shown above. The doors are named
for a significant component located behind them, as follows:
A Fuel Inlet port (shown for reference)
B Control Panel door
C Exhaust opening (shown for reference)
D Coolant Fill door
E Battery door
F Exhaust door (shown for reference)
WARNING
Contact with muffler area can result in serious
burns.
DO NOT touch hot parts and AVOID hot exhaust gases.
Allow equipment to cool before touching.
•
•
The Coolant Fill, Battery and Control Panel doors must be
installed whenever the unit is running.
Each home generator is equipped with two identical keys.
These keys fit the locks that secure the access doors.
To Open an Access Door:
1. Insert key into lock of access door handle you wish
to open and turn one quarter turn counterclockwise.
Remove key. Handle will remain unlocked until you re-
lock it.
2. Grasp door’s handle and turn one quarter turn
counterclockwise to open.
3. Coolant Fill door is unlocked in the same manner. It can
be used for adding coolant or oil.
To Close an Access Door:
1. Close door and turn handle one quarter turn clockwise.
2. Insert key into lock in handle and turn one quarter turn
clockwise. Remove key.
The Gaseous Fuel System
WARNING
Propane and Natural Gas are extremely
flammable and explosive.
Fire or explosion can cause severe burns or
death.
LP gas is heavier than air and will settle in low areas.
Natural gas is lighter than air and will collect in high
areas.
The slightest spark can ignite these fuels and cause an
explosion.
DO NOT light a cigarette or smoke.
•
•
•
•
The information provided below is to assist gaseous fuel
system technicians in planning installations. In no way
should this information be interpreted to conflict with
applicable fuel gas codes. Consult with your local fuel
supplier or Fire Marshall if questions or problems arise.
TO THE INSTALLER: Consult with the home generator
owner(s) and convey any technical considerations that might
affect their installation plans before applying these general
guidelines.
The following general rules apply to gaseous fuel system
piping:
• The piping should be of a material that conforms to
federal and local codes, rigidly mounted and protected
against vibration.
• Piping should be protected from physical damage
where it passes through flower beds, shrub beds, and
other cultivated areas where damage could occur.
B
A
C
D
E
F

11
• Install the flexible, gaseous hose (supplied) between
the home generator Fuel Inlet port and rigid piping to
prevent thermal expansion or contraction from causing
excessive stress on the piping material.
NOTE: Where local conditions include earthquake, tornado,
unstable ground, or flood hazards, special consideration
shall be given to increase strength and flexibility of piping
supports and connections.
CAUTION
The supplied flexible gaseous pipe is not to be installed
underground or in contact with the ground.
The entire flexible gaseous pipe must be visible for
periodic inspection and must not be concealed within,
contact, or run through any wall, floor, or partition.
•
• Piping must be of the correct size to maintain the
required supply pressures and volume flow under
varying generator load conditions with all gas
appliances connected to the fuel system turned on and
operating.
• Use a pipe sealant or joint compound approved for
use with NG/LPG on all threaded fittings to reduce the
possibility of leakage.
• Installed piping must be properly purged and leak
tested, in accordance with applicable codes and
standards.
WARNING
Propane and Natural Gas are extremely
flammable and explosive.
Fire or explosion can cause severe burns or
death.
Before placing the home generator into service, the fuel
system lines must be properly purged and leak tested.
NO leakage is permitted.
•
•
Consider the following factors when planning to install the
fuel supply system:
• A minimum of one accessible, approved manual shutoff
valve shall be installed in the fuel supply line within
6 ft (1.8 m) of the home generator. A union or flanged
connection shall be provided downstream from this
valve to permit removal of controls.
• LP gas fuel supply pressure should be 7 to 11 inches
of water (in. W.C.) at full load with all gas appliances
turned on and operating.
• Natural gas fuel supply pressure at the generator’s fuel
inlet port should be between 7 to 11 inches of water
(in. W.C.) at full load with all gas appliances turned on
and operating.
The home generator unit has been factory set to run on
natural gas. The unit can be converted from natural gas to
LP gas or vice versa using two people and special tools. See
Fuel Conversion, later in this manual.
It is recommended that the fuel connection incorporate the
following components:
• A minimum 10 ft. (3 m) section of gas pipe between
the primary fuel regulator and the generator fuel inlet
connection (acts as accumulator for high block loads).
• A manual fuel shut-off valve located in the interior of
the building.
• A manual fuel shut-off valve located outside the
building, just before the generator unit.
• Where the formation of hydrates or ice is known to
occur, piping should be protected against freezing. The
termination of hard piping should include a sediment
trap where condensate is not likely to freeze.
• A manometer port should be provided.
The manometer port permits temporary installation of a
manometer to ensure that the engine receives the correct
fuel pressure to operate efficiently throughout its operating
range.
NOTE: A digital manometer, P/N 19495, is available at your
Briggs & Stratton service center.

12 BRIGGSandSTRATTON.COM
When the initial test runs are completed, the manometer
is removed and the port is plugged. A typical final fuel
connection assembly is shown here, where (A) is the fuel
supply and (B) goes to the home generator.
Fuel Pipe Sizing
There are numerous on-line or otherwise-published
references for fuel pipe sizing. The installer should consider
the specific gravity of gas and compensate for a nominal
amount of restriction from bends, fittings, etc. If an unusual
number of fittings, bends, or other restrictions are used,
please refer to federal and local codes.
Fuel Consumption
Estimated fuel supply requirements at half and full load for
natural gas and LP vapor fuels are shown below.
B
A
Natural Gas LP Vapor
1/2 Load Full Load 1/2 Load Full Load
27kW 259 C 420 C N/A N/A
259,000 B 420,000 B N/A N/A
30kW N/A N/A 92 C 150 C
N/A N/A 228,800 B 373,000 B
C = Cubic feet per hour
B = BTU’s per hour
Physical Properties LP Vapor Natural
Gas
Normal Atmospheric State Gas Gas
Boiling Point (in °F):
Initial
End -44 -44 -259 -259
Heating Value:
BTU per gallon (Net LHV*)
BTU per gallon (gross**)
Cubic feet (gas)
83,340
91,547
2,500
63,310
1,000
Density*** 36.39 57.75
Weight† 4.24 2.65
Octane Number:
Research
Motor 110+ 97 110+
* LHV (Low Heat Value) is the more realistic rating.
** Gross heat value does not consider heat lost in the form of water
during combustion.
*** Density is given in “Cubic Feet of Gas per Gallon of Liquid”.
† Weight is given in “Pounds per Gallon of Liquid”.

13
System Connectors
LV connections to signal fault contacts, transfer switch communication, remote LED and auxiliary 12VDC power are made to
a removable ten-pin connector plug. Compare this illustration with your generator to familiarize yourself with the location of
these important connections:
A - 10 Pole Connector Plug
B - Fault Contacts — Use NO, COM and NC for operating a
siren, light, optional GenAlert, etc. to alert you in case
of a fault. Contacts reverse state (NO goes to NC and
vice versa) upon a fault condition.
C - Transfer Switch Communication — Connect to transfer
switch control board for communication interface.
D - Remote LED Output — Used to connect to the remote
LED supplied with the generator. The remote LED will
turn on and off in a series of blinks if certain faults are
detected in the generator.
E - +12 Volt DC, .5 Amp Output — Internal auxiliary power
supply.
C
B
A
D
E

14 BRIGGSandSTRATTON.COM
Generator AC Connection System
A single-phase, three-wire AC connection system is used in
the home generator. The stator assembly consists of a pair
of stationary windings with two leads brought out of each
winding. The junction of leads T2 and T3 forms the neutral
lead, as shown schematically and as wiring diagram below. A
complete schematic and wiring diagram can be found later in
this manual.
NOTE: Neutral is not bonded to ground at generator.
Grounding the Generator
Ground the home generator per applicable codes, standards
and regulations. There are two generator GND lug locations.
The one inside the alternator junction box next to the
circuit breaker is the primary lug and should meet most
applications. The second generator GND lug is located on the
frame below the generator circuit breaker cover, and should
ONLY be used for a ground rod located at the generator, if
required by local codes. See Controls for location.
Utility Circuit Connection
“240V Utility” leads must be routed in conduit. The
“240V Utility” leads deliver power to the generator’s circuit
board and water heater. This power also charges the battery.
When power on these leads is lost, the generator will start.
Using installer-supplied minimum 300V, 14 AWG copper
wire, connect each ten-amp fuse terminal in the alternator
junction box to the ten-amp fuse terminals in the automatic
transfer switch.
Fault Detection System
The generator may have to run for long periods of time with
no operator present. For that reason, the system is equipped
with sensors that automatically shut down the generator in
the event of potentially damaging conditions, such as low
oil pressure, high water temperature, over speed, and other
conditions. Refer to Fault Detection System in the Operator’s
Manual for more detailed information.
The owner will use the remote LED indicator to observe the
status of the home generator system. Consult with the owner
for a convenient location. Locate the electrical box in an
area visible by the home owner such as near a garage door
opener or security control panel.
To install the remote LED indicator:
1. Push the LED through the mounting plate from the
front until it snaps in place.
IMPORTANT: The LED is polarity sensitive.
2. Using provided 10 pole connector and installer-supplied
minimum 18AWG wire, connect the remote LED to the
generator control board +LED and GND connection.
Use wire nuts to attach wire to LED leads.
3. Attach mounting plate to installer-supplied electrical
box.
10 A
10 A
240 VAC
T2
120 V
120 V
240 V
T4
T1
T3
N
G
T4
T1
Neutral
To Transfer Switch
Control
Board
Ground
Power Winding
Circuit
Breaker
Line 1
Water
Heater
Neutral
Neutral
To Transfer Switch
Utility Fuse
Connection
Line 2
Ground

15
System Control Panel
The home generator control panel, located inside the
generator housing, is shown below.
Brief descriptions of the controls used during installation are:
A Removable Panel — To assist with conduit connection.
B Circuit Breaker — Must be ON to supply power to the
transfer switch.
C Set Exercise Switch — Used to set time of the exercise
cycle.
D Manual Over-Ride Switch — Used to manually start
and stop the generator.
E 15 Amp Fuse — Protects the DC control circuits.
F System Switch — Switches modes to OFF and AUTO.
G Digital Display — Displays running time in hours, and
fault codes.
More information may be found in Controls in the Operator’s
Manual.
System Switch
This two-position switch is the most important control on
the home generator and is used as follows:
• “AUTO” position is the normal operating position. If
a utility power outage is sensed, the system will start
the generator. When utility power is restored, lets the
engine stabilize internal temperatures, shuts off the
generator, and waits for the next utility power outage.
• “OFF” position turns off running generator, prevents
unit from starting and resets any detected faults.
15 Amp Fuse
Protects the home generator DC control circuits. If the fuse
has ‘blown’ (melted open) or was removed, the engine
cannot crank or start. Replace the fuse using only an
identical ATO 15A fuse. One spare fuse is supplied with the
unit. If fuse was blown or removed, you will need to reset
the exercise timer (see Setting Exercise Timer).
Final Installation Considerations
Engine Oil
NOTICE
Any attempt to crank or start the engine before it has been
properly serviced with the recommended oil will result in
equipment failure.
Refer to Maintenance and engine manual for oil fill
information.
Damage to equipment resulting from failure to follow this
instruction will void engine and generator warranty.
•
•
This engine is shipped from the factory pre-run and filled
with non-synthetic oil (API SL 10W-30W). This allows for
system operation in a wide range of temperature and climate
conditions. Before starting the engine, check oil level and
ensure that engine is serviced as described in the engine
operator’s manual.
Coolant System
This engine is shipped from the factory filled with a 50-
50 mix of automotive (Dex-Cool™ orange) anti-freeze and
water. This will provide optimum year round protection
against freezing, boiling and corrosion. The coolant system
incorporates a water heater that operates when ambient
temperature is below 80ºF AND utility power is present at
the transfer switch. Before starting the engine, check coolant
level as described in the engine operator’s manual.
B
A
C
D
F
EG

16 BRIGGSandSTRATTON.COM
Battery
The installer must supply a sealed, rechargeable 12 Volt DC,
650 Cold Cranking Amps (CCA) 55 amp hour starting
battery. The battery may not be at full charge when installed.
If battery voltage is below 12 Volts, charge the battery. See
Battery in Maintenance for details.
NOTE: DO NOT use a deep-cycle type battery.
Fuel Supply System
Ensure that all fuel pipe connections are tight, secure and
without leaks.
Ensure that all gas line shutoff valves are OPEN and that
adequate fuel pressure is available whenever automatic
operation is desired.
Initial Start-up (No Load)
Before operating the home generator or placing it into
service, inspect the entire installation carefully.
Then begin testing the system without any electrical loads
connected, as follows:
NOTE: Unit has been set-up for natural gas operation at the
factory. Fuel conversion, if needed, must be completed prior
to performing these steps.
1. Set generator’s main circuit breaker to its ON (closed)
position.
2. Confirm 15 Amp fuse is installed in control panel.
3. Set generator’s system switch to AUTO.
4. Push MANUAL OVER-RIDE button on control panel.
NOTE: When the generator is started for the very first time, it
will require that air in the gaseous fuel lines be purged. This
may take a few minutes.
5. DO NOT crank engine for more than 15 seconds, then
pause for 15 seconds to reduce heat in the starter.
6. Repeat process until engine starts.
7. Listen for unusual noises, vibration or other indications
of abnormal operation. Check for oil or coolant leaks
while engine runs.
8. Let engine warm up for about five minutes to allow
internal temperatures to stabilize.
9. Connect an accurate AC voltmeter and a frequency
meter to check generator output at load side of circuit
breaker. No-load voltage should be 239-244 Volts,
frequency should be 59.8 - 60.2 Hz.
NOTE: If AC voltage is outside these ranges, perform the
generator adjustment, Steps 13 and 14 below.
10. Check generator output between one of the generator
connection lugs and the neutral lug, then between the
other generator connection lug and the neutral lug.
In both cases, voltage reading should be between
117-123 Volts.
11. Push and hold MANUAL OVER-RIDE button on control
panel again until engine stops.
IMPORTANT: DO NOT proceed until you are certain that
generator AC voltage is correct and within the stated limits.
Generator frequency is fixed and not adjustable
12. If voltage and frequency values are correct, proceed to
step 15.
13. Connect voltmeter as described in step 9 above.
14. While observing voltmeter, adjust alternator voltage
control (A) for 240 volts. DO NOT adjust either of the
other alternator controls.
15. Install alternator circuit breaker enclosure cover.
16. Close all enclosure access doors.
Fuel Conversion
The unit is shipped from the factory calibrated for NG
operation. To convert the engine from NG to LP vapor
operation, follow these steps:
1. Disconnect NEGATIVE battery cable from battery.
2. Set the generator’s main circuit breaker OFF.
3. Set the control panel System switch to OFF.
4. Install O2sensor into exhaust manifold.
NOTE: Avoid leaving O2sensor attached for lengthy period.
5. After purging fuel supply line, push MANUAL OVER-
RIDE button on control panel. When the engine starts,
allow it to warm up for a few minutes under no load.
6. Attach a timing light to engine. Loosen distributor
hold-down clamp. While one person observes timing
indicator, a second person adjusts distributor for
20º before top dead center. Tighten distributor hold-
down.
NOTE: If converting from LP to NG, use 32º before top dead
center.
UNDER-FREQ.
ADJUST
STABILITY
ADJUST
VOLTAGE
ADJUST
A

17
7. While observing O2Analyzer readout, adjust zero
pressure regulator [ZPR] (A) and main adjustment
screw [MAS] (B) to obtain stoichiometric value shown
in table below. Select table value that corresponds to
your O2measurement system. Shaded table line is
target value.
8. Set generator’s main circuit breaker ON.
9. Apply full load to generator. Adjust MAS (B) to achieve
target value. Clockwise rotation of MAS will cause air-
fuel mixture to become more lean.
10. Set generator’s main circuit breaker OFF (no load).
Adjust ZPR (A) to achieve target value. Clockwise
rotation of ZPR will cause mixture to become more
rich. Make sure ZPR tower cap is reinstalled prior to
final reading.
11. Set generator’s main circuit breaker ON (resume full
load). Reverify sensor value remains in target area.
Adjust MAS (B) as necessary.
12. Set generator’s main circuit breaker OFF (no load).
Reverify sensor value remains in target area. Adjust
ZPR (A) as necessary.
13. Set the generator’s main circuit breaker OFF.
14. Push and hold the MANUAL OVER-RIDE button on
control panel. When the engine stops, allow it to cool
for a few minutes before proceeding.
15. Remove O2sensor from exhaust manifold and reinstall
plug. Disconnect timing light from engine.
16. Complete emissions statement and send with
installation checklist.
A B
Voltage Phi Lamda
2.40 1.000 1.000
2.45 1.012 0.988
2.50 1.024 0.977
2.55 1.036 0.966
2.60 1.048 0.955
2.65 1.060 0.944
2.70 1.071 0.933

18 BRIGGSandSTRATTON.COM
Schematic/ Wiring Diagram

19
Controls
See the Operator’s Manual for complete description of the
home generator controls.
Operation
Automatic Operation Sequence
The generator’s control panel houses a logic control circuit
board. This control board constantly monitors utility power
source voltage. Should that voltage drop below a preset
level, control board action will signal the engine to crank and
start.
When utility source voltage is restored above a preset
voltage level, the engine is signaled to shut down.
The actual system operation is not adjustable and is
sequenced by sensors and timers on the control board, as
follows:
Utility Voltage Dropout Sensor
• This sensor monitors utility source voltage.
• If utility source voltage drops below about 70 percent
of the nominal supply voltage, the sensor energizes a
10 second timer. The timer is used to ‘sense’ brown-
outs.
• Once the timer has expired, the engine will crank and
start.
Utility Voltage Pickup Sensor
This sensor monitors utility power supply voltage. When that
voltage is restored above 80 percent of the nominal source
voltage, a time delay starts timing and the engine will go to
engine cool-down.
Engine Cool-down Timer
• When the load is transferred back to the utility power
source, the engine cool-down timer starts timing.
• The timer will run for about one minute, then the
generator will stop.
• Minimum engine run time is 5 minutes.
Setting Exercise Timer
The home generator is equipped with an exercise timer that
will start and exercise the system once every seven days.
During this exercise period, the unit runs for approximately
20 minutes and then shuts down. Electrical load transfer
DOES NOT occur during the exercise cycle (unless an utility
power outage occurs).
A button on the control panel is labeled “Set Exercise” (see
System Control Panel). The specific day and the specific
time of day this button is pressed is programmed into the
control board memory. This date and time is then used to
automatically initiate the system exercise cycle. The “SET
EXERCISE” legend on the control panel will flash until the set
exercise cycle is set.
To perform the Set Exercise procedure:
1. Choose the day and time you want your home
generator to exercise.
2. On that day and time, press and hold down the “Set
Exercise” button for three seconds.
NOTE: “SET EXERCISE” will flash until the button is pressed
for three seconds, then “SET EXERCISE” will illuminate for
5 seconds, and finally turn off.
3. The unit will then start and run it’s 20 minute exercise
cycle.
For example, if you press the “Set Exercise” button on
Sunday morning at 10:00 AM, the unit will run an immediate
exercise cycle and an exercise cycle every following Sunday
at 10:00 AM (+/- 1/2 hour).
NOTE: “Set Exercise” will only work if the unit is in the
Automatic mode and this exact procedure is followed.
The exerciser will need to be re-set if the 15 Amp fuse
is removed or changed, or if the 12 Volt DC battery is
disconnected.
If you want to change the day and time the unit exercises,
simply perform the “Set Exercise” procedure at the exact
weekday and time you want it to take place.
Installation Inspection
Complete the ”Installation Checklist” as you make the
inspection. Ensure all items have been filled-in and all
signatures have been obtained. Mail the white copy (and
emissions statement, if completed) to:
Briggs & Stratton Power Products
Warranty Registration
P. O. Box 239
Jefferson, WI 53549-0239
More detailed Operating, Maintenance and Troubleshooting
information is given in the Operator’s Manual.

20 BRIGGSandSTRATTON.COM