Briggs & Stratton Home Generator Installation manual

Installation & Start-Up Manual
Home Generator System
Manual No. 199327GS Rev. D (04/10/2008)

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 over 30,000 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
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
AccessDoors...............................................10
TheGaseousFuelSystem.....................................10
FuelConsumption ...........................................12
FuelPipeSizing.............................................12
RequiredPropaneTankSize...................................12
SystemConnectors..........................................13
GroundingtheGenerator......................................14
UtilityCircuitConnection......................................14
SystemControlPanel.........................................14
Final Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
FuelSystemSelection........................................15
Schematic(12kW)...........................................18
WiringDiagram(12kW).......................................19
Schematic(15kW)...........................................20
WiringDiagram(15kW).......................................21
Controls..................................... 22
Operation.................................... 22
Automatic Operation Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SettingExerciseTimer........................................22
InstallationInspection........................................22

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. A separate
operator’s manual (part number 194689GS) contains
operating and maintenance instructions for this model.
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.
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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.
WARNING
Certain components in this product and related
accessories contain chemicals known to the State
of California to cause cancer, birth defects, or other
reproductive harm. Wash hands after handling.
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 use generator with electrical cords which are
worn, frayed, bare or otherwise damaged.
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, remove the service
disconnect from the disconnect box AND remove the
15 Amp fuse BEFORE working on the equipment.
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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.
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WARNING
Hazardous Voltage
Contact with power lines can cause electric
shock or burn.
Lifting Hazard / Heavy Object
Can cause muscle strain or back injury.
If lifting or hoisting equipment is used, DO NOT contact
any power lines.
DO NOT lift or move generator without assistance.
Use lifting pipes as described in Lifting the Generator.
The unit may shift on the lifting pipes during movement,
which can cause injury.
DO NOT lift unit by roof as damage to generator will
occur.
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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.
Keep at least minimum distances shown in General
Location Guidelines to insure for proper generator
cooling and maintenance clearances.
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.
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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.
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CAUTION
Installing the 15A fuse could cause the engine
to start.
Observe that the 15 Amp fuse has been removed from
the control panel for shipping.
DO NOT install this fuse until all plumbing and wiring has
been completed and inspected.
•
•
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.
•
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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 Oil Fill, Oil Drain and the 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.
Remain alert at all times while working on this
equipment. NEVER work on the equipment when you are
physically or mentally fatigued.
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.
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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: If operating the generator below 40°F, it is
recommended that a battery and oil warmer be installed. If
operating the generator below 32°F, a battery and oil warmer
must be installed. Both items are available at your local
servicing dealer.
Unpacking Precautions
The unit is shipped bolted to its mounting pad, ready
for installation. Avoid damage from dropping, bumping,
collision, etc. Store and unpack carton with the proper side
up, as noted on the shipping carton.
CAUTION
Installing the 15A fuse could cause the engine
to start.
Observe that the 15 Amp fuse has been removed from
the control panel for shipping.
DO NOT install this fuse until all plumbing and wiring has
been completed and inspected.
•
•
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 is supplied with:
• Home generator
• Pre-attached mounting pad
• UL569/CSA8.3-listed flexible fuel hook-up
• This installation and start-up manual
• Operator’s manual
• Installation checklist
• Two access door keys
• Four lifting hole plugs
• Oil fill spout
• One spare 15A fuse
• 2 Pole connector - 240V from house
• 10 Pole connector - Sensing and control wires
• Air intake engine cover
• Alternator cover
• Remote LED indicator kit (red LED/plate/screws)
Required Specialty Tools/Equipment
• Two 48” lengths of 1” pipe (NOT conduit)
• Hole punches for 16ga steel
• Torque screwdriver, 5 to 50 inch-pound range

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.
Keep at least minimum distances shown in General
Location Guidelines to insure for proper generator
cooling and maintenance clearances.
•
•
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.
•
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•
General Location Guidelines
• Install the unit outdoors ONLY.
• Place the unit in a prepared location that is flat 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
our 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 (MIN) clearances from aerial view of generator
(B) to combustible (D), and non-combustible (A) 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 (A) and/or (D) to (E)
• A roof cannot be used.
• Exhaust (C) must not be allowed to accumulate.
A Non-Combustible material with Fire Resistant Rating of
1 hour or greater
B Home Standby Generator
C Engine Exhaust
D Combustible Material or Structure with a Fire
Resistance Rating of less than 1 hour.
E Any structure or material. DO NOT connect (A) and/or
(D) to (E).
A
B
E
D
E
C
3’
(1m)
5’ (1.5m)
5’ (1.5m) 5’ (1.5m)
2’
(62cm)
5’ (1.5m)

9
The home generator is shipped already attached to its
mounting pad. Unless mandated by local code, a concrete
slab is not required.
If mandated by local code, construct a concrete slab at least
3 inches thick and 6 inches longer and wider than the unit.
Attach unit to slab with 1/4” diameter (minimum) masonry
anchor bolts long enough to retain the unit.
Fuel and Electrical Inlet Locations
The fuel inlet connector (B) is shown below. Also shown
is the recommended location (A) for punching holes for
attaching the power conduit.
Lifting the Generator
The generator weighs more than 530 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.
If lifting or hoisting equipment is used, DO NOT contact
any power lines.
DO NOT lift or move generator without assistance.
Use lifting pipes as described below.
The unit may shift on the lifting pipes during movement,
which can cause injury.
DO NOT lift unit by roof as damage to generator will
occur.
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Two 48” lengths of 1” pipe (C), supplied by the installer, are
required to lift the generator manually. Insert pipes through
the lifting holes (D) located near the unit’s base.
You may also lift the unit using a “hook and hoist” method
attached to the lifting pipes, provided that you use a spreader
bar to ensure that the chains or cables DO NOT touch the
generator’s roof.
After unit is in place, fill the lifting holes with the supplied
lifting hole plugs.
C
D
B
A

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 Control Panel door
B Fuel Inlet Port (shown for reference)
C Oil Fill door
D Oil Drain door
E Exhaust Port (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.
•
•
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 you wish to open
and turn one quarter turn counterclockwise.
2. Grasp door’s handle and turn one quarter turn
counterclockwise to open. Remove key.
To Close an Access Door:
1. Close door and turn doors handle one quarter of a turn
clockwise.
2. Insert key into lock of access door 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.
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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
CD
E

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 an approved pipe sealant or joint compound 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:
The home generator engine is fitted with a fuel mixer system
that meets the specifications of the California Air Resources
Board for “tamper-proof” fuel systems.
• 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.
• Natural gas fuel supply pressure at the generator’s fuel
inlet port should be between 5 to 7 inches of water (in.
W.C.) at full load.
• LP gas fuel supply pressure should be 11 to 14 inches
of water (in. W.C.) at full load with all gas appliances
turned on and operating.
The Home Generator has been factory set to run on natural
gas. If you need to change from natural gas to LP gas,
the unit will need to be reconfigured, as described in Fuel
System Selection.
It is recommended that the fuel connection incorporate the
following components:
• 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
local Briggs & Stratton service center.
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.
B
A

12 BRIGGSandSTRATTON.COM
Fuel Consumption
Estimated fuel supply requirements at half and full load for
natural gas and LP vapor fuels are shown below.
Fuel Pipe Sizing
The tables below provide the maximum capacity of pipe in
cubic feet of gas per hour for gas pressures of 0.5 psi or
less and a pressure drop of 0.3 in. water column. Specific
gravity of gas is shown.
Listed values 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.
Required Propane Tank Size
The required size of the propane tank at various
temperatures when kept at least half full is shown below
in the chart. Given the gas withdrawal rate and the lowest
average winter temperature, an installer can specify the
required LP storage tank size.
Natural Gas LP Vapor
1/2 Load Full Load 1/2 Load Full Load
12kW 102 C 195 C 41 C 79 C
102,000 B 195,000 B 103,000 B 197,000 B
15kW 126 C 242 C 56 C 108 C
126,000 B 242,000 B 140,000 B 270,000 B
C = Cubic feet per hour
B = BTU’s per hour
NPT 10ft 15ft 20ft 30ft 40ft 50ft 60ft 70ft 80ft 90ft 100ft
3/4” 346 293 240 192 163 145 132 120 113 106 99
1” 653 549 446 360 307 274 250 230 211 197 187
Natural Gas Pipe Size - Gas Flow chart, in cubic feet per hour, specific gravity=0.65
NPT 10ft 15ft 20ft 30ft 40ft 50ft 60ft 70ft 80ft 90ft 100ft
3/4” 277 192 158 126 107 95 87 79 74 69 65
1” 428 360 293 236 202 180 164 151 139 129 123
Liquid Propane (LP) Gas Pipe Size - Gas Flow chart, in cubic feet per hour, specific gravity=1.50
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”.
Withdrawal Rate 32° F 20° F 10° F 0° F -10° F -30° F -40° F
50 CFH 115 115 115 250 250 400 600
100 CFH 250 250 250 400 500 1000 1500
150 CFH 300 400 500 500 1000 1500 2500
200 CFH 400 500 750 1000 1200 2000 2500
300 CFH 750 1000 1500 2000 2500 4000 5000

13
System Connectors
Except for the power output and grounding connectors, all signal wire connections are made to removable two- or ten-pin
connector plugs. 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 to hook up 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 — Use TxRx and TxRx
GND to transfer switch to monitor generator functions.
D - Remote LED Output — Use this to hook up 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 power supply.
F - 240 Volt Utility — Use to hook up the 240V utility leads
from the transfer switch to the generator.
G - 2 Pole Connector Plug
B
A
C
D
E
F
G

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 22 and 33 forms the neutral
lead, as shown schematically and as wiring diagram below. A
complete schematic and wiring diagram can be found in the
separate illustrated parts list manual.
NOTE: Neutral is not bonded to ground at generator.
Grounding the Generator
Ground the home generator per applicable codes, standards,
and regulations. The generator GND lug is located inside the
control panel door under the circuit breaker cover.
Utility Circuit Connection
“240V Utility” leads must be routed in conduit. The
“240V Utility” leads deliver power to the generator’s circuit
board, optional battery warmer and optional oil warmer. This
power also charges the battery. When power on these leads
is lost, the generator will start.
Using provided 2 pole connector plug and installer-supplied
minimum 300V, 14 AWG copper wire, connect each control
circuit terminal in the generator to the two-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 oil 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. 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 18 AWG wire, connect the remote LED to the
generator control board. Use wire nuts to attach wire to
LED leads.
3. Attach mounting plate to installer-supplied electrical box.
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 - Set Exercise Switch — Used to set the exercise cycle.
B - System Switch — Switches modes to OFF and AUTO.
C - 15 Amp Fuse — Protects the DC control circuits.
D - Digital Display — Displays running time and fault codes.
E - Circuit Breaker — Must be ON to supply power to the
transfer switch.
F - Manual Over-Ride Switch — Turns generator ON or OFF.
B
A
C
E
F
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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 excercise timer (see Setting Excercise 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 synthetic oil (API SJ/CF 5W-30W). This allows for
system operation in the widest 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.
NOTE: The use of synthetic oil does not alter the required oil
change intervals described in the engine operator’s manual.
Battery
The home generator is supplied with a sealed, valve-
regulated, lead-acid rechargeable 12 Volt DC, AGM type,
55 Amp-Hour battery. The battery cables are connected
at the factory. The unit’s 15 Amp fuse, which isolates
the battery and prevents the unit from starting, has been
removed for shipping. The battery will lose some charge
prior to installation of the generator. If battery voltage
is below 12 Volts, charge the battery. See Battery in the
Operator’s Manual Maintenance section for details.
IMPORTANT: If battery voltage is below 5 Volts, it may not
take a charge and you will need a new 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.
Fuel System Selection
The engine of your Home Generator System is factory
calibrated to run on natural gas (NG). It may also be
operated on liquefied petroleum (LP) vapor. There is no
additional hardware/equipment required to switch between
either fuel. However, LP fuel inlet pressure must be between
11 and 14 inches water column.
To configure the fuel system for LP use:
1. Open control panel and oil fill access doors.
2. Set generator’s system switch to OFF.
3. Remove 15 Amp fuse from control panel.
For a 12kW Home Generator System:
4. Connect the fuel select solenoid by joining the two-pin
electrical connector (A).
5. Reinstall 15 Amp fuse in control panel.
6. Set generator’s system switch to AUTO.
7. Close control panel and oil fill access doors.
The system is now ready to operate automatically using LP
fuel. With a fixed main jet for LP gas, there is no need to
perform any engine adjustments for LP operation.
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For a 15kW Home Generator System:
4. Remove cap from LP inlet on T-valve.
5. Remove fuel line from NG inlet.
6. Place cap from LP inlet onto NG inlet.
7. From oil fill access area, pull fuel line out of top hole
and route it through bottom hole.
IMPORTANT: Failure to route fuel line through bottom hole
may cause the fuel line to kink. When tightening fuel hose
fittings make certain the fuel hose does not twist or kink.
If the fuel line kinks, the generator may start but will not
operate properly.
8. Connect fuel line (B) to LP inlet (C).
9. Reinstall 15 Amp fuse in control panel.
10. Set generator’s system switch to AUTO.
11. Close control panel and oil fill access doors.
The system is now ready to operate automatically using LP
fuel.
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:
1. Set generator’s main circuit breaker to its ON (closed)
position.
2. Install 15 Amp fuse in control panel.
3. Set generator’s system switch to AUTO.
4. Push MANUAL OVER-RIDE button on control panel.
NOTE: When the home 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 10 seconds, then
pause for 10 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 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. Voltage should be 239-262 Volts, frequency
should be 62.0 - 62.5 Hz.
NOTE: If either parameter is outside these ranges, perform
the Engine Adjustments described 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
119-131 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 and frequency are correct and within
the stated limits. To obtain the proper generator frequency,
see Engine Adjustments.
Engine Adjustment
There are regional variances in the composition of natural
gas. Each home generator unit leaves the factory set for
NG operation. If the generator output voltage or frequency
measured during Initial Start-Up (paragraph #9) is outside
the listed ranges, the combustibility of the gas supplied at
the installation site may be substantially different from the
fuel used at the factory.
To adjust the engine for this difference, proceed as follows.
1. Open the oil drain and control panel access doors.
2. Remove the four screws that hold the circuit breaker
cover to the air intake guard.
C
B

17
3. Connect an accurate frequency meter to the line side of
the generator’s main circuit breaker.
4. Ensure that the 15 Amp fuse is installed.
5. Set the generator’s main circuit breaker ON.
6. Set the generator’s system switch to AUTO.
7. Push MANUAL OVER-RIDE button on control panel.
When the engine starts, allow it to warm up for five
minutes.
8A. For a 12kW generator, normal no load frequency is 62.0
to 62.5 Hz. If adjustment is needed at no load, slowly
rotate the governor adjustment nut (D) clockwise and/or
counterclockwise until frequency is 62.0 to 62.5 Hz.
8B. For a 15kW generator, normal no load frequency is
62.0 to 62.5 Hz. If adjustment is needed at no load,
slowly rotate the governor adjustment screw (E)
clockwise and/or counterclockwise until frequency is
62.0 to 62.5 Hz.
9. Push and hold MANUAL OVER-RIDE button on control
panel again until engine stops.
10. Turn the service disconnect to the transfer switch off.
After a short time delay, the transfer switch will connect
to the generator.
11. Load generator to full load.
12. Connect an accurate frequency meter to the load side of
the generator’s main circuit breaker. Frequency should
be above 57.0 Hz.
13. If frequency is below 57.0 Hz, slowly rotate the
governor adjustment nut or screw clockwise and/or
counterclockwise until frequency is above 57.0 Hz.
14. Turn the service disconnect to the transfer switch on.
The transfer switch will connect to the utility after five
minutes.
15. After the engine has stopped running,
• If an adjustment was made in step 13, repeat steps
3 through 9.
• If an adjustment was not made in step 13, proceed
to step 16.
IMPORTANT: If the no load frequency falls out of the no
load parameter after full load adjustment is made, contact an
authorized service center.
16. Reinstall the circuit breaker cover to the air intake
guard.
17. Close the oil drain and control panel access doors.
E
D

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Schematic (12kW)

19
Wiring Diagram (12kW)

20 BRIGGSandSTRATTON.COM
Schematic (15kW)