Generac Power Systems 04673-2 Installation instructions

POWER SYSTEMS, INC.
®
Installation and
Owner’s Manual
Air-cooled Automatic
Standby Generators
Models:
04673-2 (6 kW NG, 7 kW LP)
04674-2 (12 kW NG, 12 kW LP)
04675-3 (13 kW NG, 15 kW LP)
DANGER
DEADLY EXHAUST FUMES. OUTDOOR INSTALLATION ONLY!
Not intended for use as Primary Power in place of utility
or in life-support applications.

GENERAC
POWER SYSTEMS, INC.
R
R
*This manual should remain with the unit.*


INTRODUCTION
Thank you for purchasing this model by Generac
Power Systems Inc.. This model is a compact, high
performance, air-cooled, engine-driven generator
designed to automatically supply electrical power to
operate critical loads during a utility power failure.
This unit is factory installed in an all-weather, metal
enclosure that is intended exclusively for outdoor instal-
lation. This generator will operate using either vapor
withdrawn liquid propane (LP) or natural gas (NG).
READ THIS MANUAL THOROUGHLY
If any portion of this manual is not understood, contact
the nearest Authorized Dealer for starting, operating
and servicing procedures.
Throughout this publication, and on tags and
decals affixed to the generator, DANGER, WARNING,
CAUTION and NOTE blocks are used to alert person-
nel to special instructions about a particular opera-
tion that may be hazardous if performed incorrectly
or carelessly. Observe them carefully. Their defini-
tions are as follows:
DANGER
After this heading, read instructions that, if not
strictly complied with, will result in serious person-
al injury, including death, in addition to property
damage.
After this heading, read instructions that, if not
strictly complied with, may result in serious person-
al injury or property damage.
After this heading, read instructions that, if not
strictly complied with, could result in damage to
equipment and/or property.
NOTE:
After this heading, read explanatory statements
that require special emphasis.
These safety warnings cannot eliminate the hazards
that they indicate. Common sense and strict compli-
ance with the special instructions while performing
the service are essential to preventing accidents.
Four commonly used safety symbols accompany the
DANGER, WARNING and CAUTION blocks. The type
of information each indicates is as follows:
This symbol points out important safety informa-
tion that, if not followed, could endanger personal
safety and/or property of others.
This symbol points out potential explosion hazard.
This symbol points out potential fire hazard.
This symbol points out potential electrical shock
hazard.

The operator is responsible for proper and safe use
of the equipment. The manufacturer strongly recom-
mends that the operator read this Owner's Manual
and thoroughly understand all instructions before
using this equipment. The manufacturer also strong-
ly recommends instructing other users to properly
start and operate the unit. This prepares them if they
need to operate the equipment in an emergency.
CONTENTS
This manual contains pertinent owner’s information,
including warranty, electrical diagrams, exploded
views and lists of repair parts, for three different
models:
• 04673-2 – 6 kW NG, 7 kW LP, single-cylinder GH-
410 Engine
• 04674-2 – 12 kW NG, 12 kW LP, V-twin GT-990
Engine
• 04675-3 – 13 kW NG, 15 kW LP, V-twin GT-990
Engine
OPERATION AND MAINTENANCE
It is the operator's responsibility to perform all safety
checks, to make sure that all maintenance for safe
operation is performed promptly, and to have the
equipment checked periodically by an Authorized
Dealer. Normal maintenance service and replacement
of parts are the responsibility of the owner/operator
and, as such, are not considered defects in materials
or workmanship within the terms of the warranty.
Individual operating habits and usage contribute to
the need for maintenance service.
Proper maintenance and care of the generator ensures
a minimum number of problems and keep operating
expenses at a minimum. See the Authorized Dealer
for service aids and accessories.
HOW TO OBTAIN SERVICE
When the generator requires servicing or repairs,
simply contact an Authorized Dealer for assistance.
Service technicians are factory-trained and are capa-
ble of handling all service needs.
When contacting an Authorized Dealer about parts
and service, always supply the complete model num-
ber and serial number of the unit as given on its data
decal, which is located on the generator. See Figure 1.1
or Figure 1.2 in Section 1.4 for decal location.
Model No. ____________ Serial No.______________



AUTHORIZED
DEALER LOCATION
To locate the nearest AUTHORIZED DEALER,
please call this number:
1-800-333-1322
or locate us on the web at:
www.generac.com

Table of Contents
Air-cooled 7 kW, 12 kW and 15 kW Generators
1
Introduction ........................Inside Front Cover
Read This Manual Thoroughly ........................ IFC
Contents.......................................................... IFC
Operation and Maintenance ............................ IFC
How to Obtain Service..................................... IFC
AuthorizedDealerLocatorNumber...................IFC
Safety Rules ........................................................2
Standards Index.................................................. 3
Section 1 – General Information...................4
1.1 Unpacking/Inspection .................................... 4
1.2 Protection Systems........................................ 4
1.3 System Set LED ............................................ 4
1.4 Your Generator.............................................. 5
1.5 Specifications ................................................ 6
1.5.1 Generator........................................... 6
1.5.2 Engine ................................................ 6
1.6 Fuel Requirements and Recommendations ...7
1.7 Fuel Consumption ......................................... 7
1.8 Reconfiguring the Fuel System ...................... 7
1.8.1 7 kW, 410CC ......................................7
1.8.2 12 kW and 15 kW, 990cc Engines...... 7
1.9 Location ........................................................ 8
1.9.1 Generator........................................... 8
1.9.2 Transfer Switch.................................. 8
1.10 Battery Installation ........................................ 9
1.11 The Battery ................................................... 9
Section 2 – Post Installation Start-up
and Adjustments .......................10
2.1 Before Initial Start-up.................................. 10
2.2 Check Transfer Switch Operation ...............10
2.3 Electrical Checks ........................................ 10
2.4 Generator Tests Under Load ....................... 11
2.5 Checking Automatic Operation....................11
2.6 Adjusting the Regulator (Natural Gas Only)..12
2.7 Engine Governor Adjustment ......................12
2.7.1 7 kW Units .......................................12
2.7.2 12 kW and 15 kW Units................... 13
2.7.3 Additional Corrosion Protection.......13
2.8 Voltage Regulator Adjustment...................... 13
Section 3 – Operation ....................................14
3.1 Break-in Procedure .....................................14
3.2 Using the Auto/Off/Manual Switch ............... 14
3.2.1 “Auto” Position..................................14
3.2.2 “Off”Position....................................14
3.2.3 “Manual” Position ............................. 14
3.3 Automatic Transfer Operation..................... 14
3.4 Sequence of Automatic Operation ............... 14
3.5 Manual Transfer Operation ......................... 15
3.5.1 Transfer to Generator
Power Source .....................................15
3.5.2 Transfer Back to Utility
Power Source .....................................15
3.6 Setting the Exercise Timer .......................... 16
3.7 Protection Systems...................................... 16
3.7.1 Low Oil Pressure Switch ..................16
3.7.2 High Temperature Switch................. 16
3.7.3 Overcrank ........................................16
3.7.4 Overspeed ........................................17
Section 4 – Maintenance...............................17
4.1 Fuse............................................................. 17
4.2 Checking the Engine Oil Level..................... 17
4.3 Changing the Engine Oil.............................. 17
4.3.1 Engine Oil Recommendations ..........17
4.3.2 Oil Change Procedure.......................18
4.4 Changing the Oil Filter ................................ 18
4.5 Changing the Engine Air Cleaner................. 18
4.5.1 7 kW, 12 kW and 15 kW
Generators .......................................18
4.6 Spark Plug(s) .............................................. 19
4.7 Battery Maintenance.................................... 19
4.8 Adjusting Valve Clearance ...........................20
4.9 Cooling System ........................................... 20
4.10 Attention After Submersion......................... 21
4.11 Corrosion Protection ...................................21
4.12 Out of Service Procedure.............................21
4.12.1RemovalFromService......................21
4.12.2 Return to Service ............................. 21
4.13 Service Schedule ......................................... 22
Section 5 – Troubleshooting........................ 23
5.1 Troubleshooting Guide................................ 23
Section 6 – Electrical Data ........................... 24
Section 7 – Exploded Views and
Parts Lists................................... 32
Section 8 – Mounting Dimensions............. 50
Section 9 – Notes ........................................... 51
Section 10 – Warranty ................................... 52

2
Study these SAFETY RULES carefully before install-
ing, operating or servicing this equipment. Become
familiar with this Owner’s Manual and with the
unit. The generator can operate safely, efficiently and
reliably only if it is properly installed, operated and
maintained. Many accidents are caused by failing to
follow simple and fundamental rules or precautions.
The manufacturer cannot anticipate every possible
circumstance that might involve a hazard. The warn-
ings in this manual, and on tags and decals affixed
to the unit are, therefore, not all-inclusive. If using
a procedure, work method or operating technique
the manufacturer does not specifically recommend,
ensure that it is safe for others. Also make sure the
procedure, work method or operating technique uti-
lized does not render the generator unsafe.
DANGER
Despite the safe design of this generator,
operating this equipment imprudently, neglecting
its maintenance or being careless can cause
possible injury or death. Permit only responsible
and capable persons to operate or maintain this
equipment.
Potentially lethal voltages are generated by
these machines. Ensure all steps are taken to
render the machine safe before attempting to
work on the generator.
Parts of the generator are rotating and/or hot
during operation. Exercise care near running
generators.
Please read all hazards carefully!
GENERAL HAZARDS 
• For safety reasons, the manufacturer recommends
that the installation, initial start-up and main-
tenance of this equipment is carried out by an
Authorized Dealer.
• The engine exhaust fumes contain carbon monox-
ide, which can be DEADLY. This dangerous gas, if
breathed in sufficient concentrations, can cause
unconsciousness or even death. This exhaust
system must be installed properly, in strict com-
pliance with applicable codes and standards.
Following installation, do nothing that might ren-
der the system unsafe or in noncompliance with
such codes and standards.
• Keep hands, feet, clothing, etc., away from drive
belts, fans, and other moving or hot parts. Never
remove any drive belt or fan guard while the unit
is operating.
• Adequate, unobstructed flow of cooling and venti-
lating air is critical to correct generator operation.
Do not alter the installation or permit even partial
blockage of ventilation provisions, as this can seri-
ously affect safe operation of the generator. The
generator MUST be installed outdoors.
• When working on this equipment, remain alert
at all times. Never work on the equipment when
physically or mentally fatigued.
• Inspect the generator regularly, and contact the
nearest Authorized Dealer for parts needing repair
or replacement.
• Before performing any maintenance on the gen-
erator, disconnect its battery cables to prevent
accidental start up. Disconnect the cable from the
battery post indicated by a NEGATIVE, NEG or (–)
first. Reconnect that cable last.
• Never use the generator or any of its parts as a
step. Stepping on the unit can stress and break
parts, and may result in dangerous operating con-
ditions from leaking exhaust gases, fuel leakage,
oil leakage, etc.
ELECTRICAL HAZARDS 
• All generators covered by this manual produce
dangerous electrical voltages and can cause fatal
electrical shock. Utility power delivers extremely
high and dangerous voltages to the transfer switch
as does the standby generator when it is in opera-
tion. Avoid contact with bare wires, terminals,
connections, etc., while the unit is running. Ensure
all appropriate covers, guards and barriers are in
IMPORTANT SAFETY INSTRUCTIONS
Air-cooled 7 kW, 12 kW and 15 kW Generators
SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe
operation be copied and posted near the unit’s installation site. Safety should be stressed to
all operators and potential operators of this equipment.

The engine exhaust from this product
contains chemicals known to the state
of California to cause cancer, birth
defects or other reproductive harm.
WARNING:

This product contains or emits chemicals
known to the state of California to cause
cancer, birth defects or other reproductive harm.
WARNING:


3
place before operating the generator. If work must
be done around an operating unit, stand on an
insulated, dry surface to reduce shock hazard.
• Do not handle any kind of electrical device while
standing in water, while barefoot, or while hands or
feet are wet. DANGEROUS ELECTRICAL SHOCK
MAY RESULT.
• The National Electrical Code (NEC) requires the
frame and external electrically conductive parts of
the generator to be connected to an approved earth
ground. Local electrical codes also may require
proper grounding of the generator electrical sys-
tem.
• After installing this home standby electrical sys-
tem, the generator may crank and start at any
time without warning. When this occurs, load cir-
cuits are transferred to the STANDBY (generator)
power source. To prevent possible injury if such a
start and transfer occur, always set the generator’s
AUTO/OFF/MANUAL switch to its OFF position
before working on equipment and remove the 5A
and 15A fuses from the generator control panel.
• In case of accident caused by electric shock, imme-
diately shut down the source of electrical power. If
this is not possible, attempt to free the victim from
the live conductor. AVOID DIRECT CONTACT WITH
THE VICTIM. Use a nonconducting implement,
such as a rope or board, to free the victim from the
live conductor. If the victim is unconscious, apply
first aid and get immediate medical help.
• Never wear jewelry when working on this equip-
ment. Jewelry can conduct electricity resulting in
electric shock, or may get caught in moving com-
ponents causing injury.
FIRE HAZARDS 
• For fire safety, the generator must be installed
and maintained properly. Installation always must
comply with applicable codes, standards, laws
and regulations. Adhere strictly to local, state and
national electrical and building codes. Comply
with regulations the Occupational Safety and
Health Administration (OSHA) has established.
Also, ensure that the generator is installed in
accordance with the manufacturer’s instructions
and recommendations. Following proper installa-
tion, do nothing that might alter a safe installation
and render the unit in noncompliance with the
aforementioned codes, standards, laws and regula-
tions.
• Keep a fire extinguisher near the generator at all
times. Extinguishers rated “ABC” by the National
Fire Protection Association are appropriate for
use on the standby electric system. Keep the extin-
guisher properly charged and be familiar with its
use. If there are any questions pertaining to fire
extinguishers, consult the local fire department.
EXPLOSION HAZARDS 
• Do not smoke around the generator. Wipe up any
fuel or oil spills immediately. Ensure that no com-
bustible materials are left in the generator com-
partment, or on or near the generator, as FIRE or
EXPLOSION may result. Keep the area surround-
ing the generator clean and free from debris.
• Gaseous fluids such as natural gas and liquid pro-
pane (LP) gas are extremely EXPLOSIVE. Install
the fuel supply system according to applicable
fuel-gas codes. Before placing the home standby
electric system into service, fuel system lines must
be properly purged and leak tested according to
applicable code. After installation, inspect the fuel
system periodically for leaks. No leakage is permit-
ted.
STANDARDS INDEX
In the absence of pertinent standards, codes, regu-
lations and laws, the published information listed
below may be used as installation guide for this
equipment.
1. NFPA No. 37, STATIONARY COMBUSTION
ENGINES AND GAS TURBINES, available from
the National Fire Protection Association, 470
Atlantic Avenue, Boston, MA 02210.
2. NFPA No. 76A, ESSENTIAL ELECTRICAL
SYSTEMS FOR HEALTH CARE FACILITIES,
available same as Item 1.
3. NFPA No. 54, NATIONAL FUEL GAS CODE,
available same as Item 1.
4. NFPA No. 58, AMERICAN NATIONAL STANDARD
FOR STORAGE AND HANDLING OF LIQUEFIED
PETROLEUM GAS, available same as Item 1.
5. NFPA No. 70, NFPA HANDBOOK OF NATIONAL
ELECTRIC CODE, available same as Item 1.
6. Article X, NATIONAL BUILDING CODE, available
from the American Insurance Association, 85
John Street, New York, N.Y. 10038.
7. AGRICULTURAL WIRING HANDBOOK, avail-
able from the Food and Energy Council, 909
University Avenue, Columbia, MO 65201.
8. ASAE EP-3634, INSTALLATION AND
MAINTENANCEOFFARMSTANDBYELECTRICAL
SYSTEMS, available from the American Society
of Agricultural Engineers, 2950 Niles Road, St.
Joseph, MI 49085.
9. NFPA No. 30, FLAMMABLE AND COMBUSTIBLE
LIQUIDS CODE, available same as Item 1.

IMPORTANT SAFETY INSTRUCTIONS
Air-cooled 7 kW, 12 kW and 15 kW Generators

DANGER
Only qualified electricians or contractors should
attempt such installations, which must comply
strictly with applicable codes, standards and
regulations.
1.1 UNPACKING/INSPECTION
After unpacking, carefully inspect the contents
for damage.
• This standby generator set has been factory sup-
plied with a weather protective enclosure that is
intended for outdoor installation only.
If this generator is used to power electrical load
circuits normally powered by a utility power
source, it is required by code to install a trans-
fer switch. The transfer switch must effectively
isolate the electrical system from the utility
distribution system when the generator is oper-
ating (NEC 700, 701 and 702). Failure to isolate
an electrical system by such means will result in
damage to the generator and also may result in
injury or death to utility power workers due to
backfeed of electrical energy.
If any loss or damage is noted at time of delivery, have
the person(s) making the delivery note all damage on
the freight bill or affix his or her signature under the
consignor's memo of loss or damage.
If there is loss or damage after delivery, separate the
damaged materials and contact the carrier for claim
procedures.
“Concealed damage” is understood to mean damage
to the contents of a package that is not in evidence at
the time of delivery, but is discovered later.
1.2 PROTECTION SYSTEMS
Unlike an automobile engine, the generator may have
to run for long periods of time with no operator pres-
ent to monitor engine conditions. For that reason, the
engine is equipped with the following systems that
protect it against potentially damaging conditions:
1. Low Oil Pressure Sensor 3. Overcrank
2. High Temperature Sensor 4. Overspeed
There are LED readouts on the control panel to notify
personnel that one of these faults has occurred. There
is also a “System Set” LED that is described below.
1.3 SYSTEM SET LED
The “System Set” LED is lit when all of the following
conditions are true:
1. The AUTO/OFF/MANUAL switch is set to the
AUTO position.
2. The utility voltage being supplied to the unit is
being sensed by the Control PCB. If the utility
sense voltage is not connected to the unit or if it
is below 168 volts AC, then the system set light
will flash rapidly. This indicates that if the AUTO/
OFF/MANUAL switch is placed in the Auto posi-
tion , the generator will start.
3. The “Not In Auto” dip switch is set to the OFF
position on the control board.
4. No alarms are present, for example, low oil pres-
sure, high temperature, etc.
Section 1 — General Information
Air-cooled 7 kW, 12 kW and 15 kW Generators
4

Section 1 — General Information
Air-cooled 7 kW, 12 kW and 15 kW Generators
5
1.4 THE GENERATOR
Exh
aust
En
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lo
su
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e
Oi
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Re
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F
uel
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Batter
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Com
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Exh
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Batter
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uel
Inl
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e
Figure 1.2 – 12 kW/15 kW, V-twin GT-990/760 Engine
Figure 1.1 – 7 kW, Single Cylinder GH-410 Engine

6
Section 1 — General Information
Air-cooled 7 kW, 12 kW and 15 kW Generators
1.5 SPECIFICATIONS
1.5.1 GENERATOR
Model 04673 Model 04674 Model 04675
Rated Max. Continuous Power 6,000 NG/7,000 LP 12,000 NG/12,000 LP 13,000 NG/15,000 LP
Capacity (Watts*)
Rated Voltage 120/240 120/240 120/240
Rated Max. Continuous Load
Current (Amps)
120 Volts + 50.0 NG/58.3 LP 100 NG/100.0 LP 108.3 NG/125.0 LP
240 Volts 25.0 NG/29.2 LP 50 NG/50.0 LP 54.2 NG/62.5 LP
Main Line Circuit Breaker 30 Amp 50 Amp 65 Amp
Phase 1 1 1
Number of Rotor Poles 2 2 2
Rated AC Frequency 60 Hz 60 Hz 60 Hz
Power Factor 1 1 1
Recommended Air Filter Part # 0C8127 Part # 0C8127 Part # 0C8127
Battery Requirement Group 26/26R Group 26/26R Group 26/26R
12 Volts and 12 Volts and 12 Volts and
350 Cold-cranking 525 Cold-cranking 525 Cold-cranking
Amperes Minimum Amperes Minimum Amperes Minimum
Weight 375 Pounds 470 Pounds 487 Pounds
Output Sound Level @ 23 ft (7m) at full load 68 db (A) 70.5db (A) 71.5 db (A)
Normal Operating Range -20°F (-28.8°C) to 104°F (40°C)
* Maximum wattage and current are subject to and limited by such factors as fuel Btu content, ambient temperature, altitude, engine power and condition, etc. Maximum power
decreases about 3.5 percent for each 1,000 feet above sea level; and also will decrease about 1 percent for each 6° C (42° F) above 16° C (60° F).
+ Total current in TWO separate curcuits. Current in each curcuit must not exceed the value stated for 240V.
1.5.2 ENGINE
Model 04673 Model 04674 Model 04675
Type of Engine GH-410 GT-990 GT-990
Number of Cylinders 1 2 2
Rated Horsepower 14.5 @ 3,600 rpm 30 @ 3,600 rpm 30 @ 3,600 rpm
Displacement 410cc 992cc 992cc
Cylinder Block Aluminum w/Cast Aluminum w/Cast Aluminum w/Cast
Iron Sleeve Iron Sleeve Iron Sleeve
Valve Arrangement Overhead Valves Overhead Valves Overhead Valves
Ignition System Solid-state w/Magneto Solid-state w/Magneto Solid-state w/Magneto
Recommended Spark Plug RC14YC RC12YC RC12YC
Spark Plug Gap 0.76 mm (0.030 inch) 0.508 mm (0.020 inch) 0.508 mm (0.020 inch)
Compression Ratio 8.6:1 9.5:1 9.5:1
Starter 12 Vdc 12 Vdc 12Vdc
Oil Capacity Including Filter Approx. 1.5 Qts Approx. 1.7 Qts Approx. 1.7 Qts
Recommended Oil Filter Part # 070185B Part # 070185B Part # 070185B
Recommended Air Filter Part # 0C8127 Part # 0C8127 Part # 0C8127
Operating RPM 3,600 3,600 3,600



7
1.6 FUEL REQUIREMENTS
AND RECOMMENDATIONS
With LP gas, use only the vapor withdrawal
system. This type of system uses the vapors formed
above the liquid fuel in the storage tank.
The engine has been fitted with a fuel carburetion
system that meets the specifications of the 1997
California Air Resources Board for tamper-proof
dual fuel systems. The unit will run on natural gas or
LP gas, but it has been factory set to run on natural
gas. Should the primary fuel need to be changed to
LP gas, the fuel system needs to be reconfigured. See
Section 1.9 for instructions on reconfiguration of the
fuel system.
Recommended fuels should have a Btu content of at
least 1,000 Btus per cubic foot for natural gas; or at
least 2,520 Btus per cubic foot for LP gas. Ask the
fuel supplier for the Btu content of the fuel.
Required fuel pressure for natural gas is 5 inches to
7 inches water colum (0.18 to 0.25 psi); and for
liquid propane, 10 inches to 12 inches of water
column (0.36 to 0.43 psi).
NOTE:
Any piping used to connect the generator to the
fuel supply should be of adequate size to ensure
the fuel pressure NEVER drops below 4 inches
water colum for natural gas or 10 inches water
column for liquid propane for all load ranges.
1.7 FUEL CONSUMPTION
*Natural gas is in cubic feet per hour.
**LP is in gallons per hour/cubic feet per hour.
1.8 RECONFIGURING THE
FUEL SYSTEM
1.8.1 7 KW, 410CC
To reconfigure the fuel system from NG to LP, follow
these steps (Figure 1.3):
NOTE:
The primary regulator for the propane supply is
NOT INCLUDED with the generator. A fuel pres-
sure of 10 to 12 inches of water column (0.36 to
0.43 psi) to the fuel inlet of the generator MUST
BE SUPPLIED.
1. Turn off the main gas supply (if connected).
2. Open the roof and remove the door.

3. Remove the battery (if installed).
4. Disconnect wire #0 and wire #14 from the gas
solenoid on top of the demand regulator.
5. Remove the carburetor fuel hose from the outlet
port of the demand regulator.
6. Remove the demand regulator by removing the
fastener that retains the regulator mounting
bracket.
7. Remove the square headed steel pipe plug from
outlet port #1 and the brass hose barb fitting
from outlet port #2.
8. Refit the brass hose barb fitting to outlet port #1
and the square headed steel pipe plug to outlet
port #2.
9. Reverse procedure steps 1-5 to reinstall demand
regulator.
10. Take the plastic plug supplied in the poly-bag
with the generator and press it into the 3/4” hole
on the bottom of the air cleaner base (Figure
4.6).
11. Reverse the procedure to convert back to natural
gas.
Figure 1.3 – Demand Regulator
N
G
F
U
EL
S
Y
S
TE
M
LP F
U
EL
S
Y
S
TE
M
F
U
EL H
OSE
BRA
SS
H
OS
E
FITTIN
G
BRA
SS
H
OS
E
FITTIN
G
F
U
EL
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E
T
OU
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T
P
O
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T
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U
EL H
OSE
AD
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TMEN
T
SC
RE
W
H
OS
E & PL
UG
S
WIT
C
HED
S
IDE
S
PIPE
PL
UG
NOTE:
The natural gas adjustment screw is preset dur-
ing installation and should not need any further
adjustment.
1.8.2 12KW AND 15KW, V-TWIN ENGINES
To reconfigure the fuel system from NG to LP, follow
these steps:
NOTE:
The primary regulator for the propane supply is
NOT INCLUDED with the generator. A fuel pres-
sure of 10 to 12 inches of water column (0.36 to
0.43 psi) to the fuel inlet of the generator MUST
BE SUPPLIED.

Section 1 — General Information
Air-cooled 7 kW, 12 kW and 15 kW Generators
Model # Nat. Gas (*) LP Vapor (**)
1/2LoadFullLoad 1/2Load FullLoad
04673 66 119 0.82/30 1.47/54
04674 152 215 1.53/56 2.08/76
04675 156 220 1.58/58 2.40/88

1. Turn off the gas supply. (if connected)
2. Open the roof and remove the door.
3. Remove the battery. (if installed)
4. Remove the engine air in baffle located on the left-
hand side of the battery compartment. Two M6
screws are located on top of the baffle and two
M6 screws are located on the inside of the baffle
towards the back.
5. Remove the small hose clamp and hose from the
fuel regulator. It may be necessary to pry the hose
off of the brass fitting using a screwdriver to gen-
tly lift up the hose edge.
6. Remove the small brass hose fitting from the
regulator casting.
7. Place the small fuel jet, thread side first, into the
threaded hole originally occupied by the brass
hose fitting (Figure 1.4).
Figure 1.4 - Demand Regulator
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8. Using a short No. 2 Phillips screw driver, thread
the small fuel jet into the regulator casting. Do
not over tighten.
9. Apply thread sealant to the threads of the hose
fitting and replace it into the regulator body.
10. Re-attach the small hose and hose clamp and
tighten as necessary.
11. Replace the engine air in baffle using the four M6
screws.
12. Identify both brass adjustment screws on the
regulator.
NOTE:
One adjustment screw can be accessed from the
front of the unit and the second can be accessed
from the back of the unit enclosure by removing
the plastic hole plug. The screw can be turned
with a long flat blade screwdriver.
13. To adjust the system to run on LP fuel, turn
BOTH adjuster screws 1/2 TURN CLOCKWISE.
The system should now be set for maximum
power and best perfomance. DO NOT, UNDER
ANY CIRCUMSTANCES, REMOVE THE SET
PINS FROM THE REGULATOR HOUSING.
THIS WILL VOID THE WARRANTY.
14. It may be necessary to make minor adjustments
to the preset adjustment screw settings to achieve
maximum power, particularly at higher altitudes.
If experiencing problems with the unit producing
maximum power, follow the procedure in Section
2.6 (Adjusting the Fuel Regulator).
1.9 LOCATION
1.9.1 GENERATOR
Install the generator set, in its protective enclosure,
outdoors, where adequate cooling and ventilating air
is always available. Consider these factors:
• Install the unit where air inlet and outlet open-
ings will not become obstructed by leaves, grass,
snow, etc. If prevailing winds will cause blowing or
drifting, consider using a windbreak to protect the
unit.
• Install the generator on high ground where water
levels will not rise and endanger it.
• Allow sufficient room on all sides of the generator
for maintenance and servicing. A good rule is to
allow three feet of space on all sides.
• Where strong prevailing winds blow from one
direction, face the generator air inlet openings to
the prevailing winds.
• Install the generator as close as possible to the fuel
supply, to reduce the length of piping.
• Install the generator as close as possible to
the transfer switch. HOWEVER, REMEMBER
THAT LAWS OR CODES MAY REGULATE THE
DISTANCE.
1.9.2 TRANSFER SWITCH
1.9.2.1 7 kW, 12 kW and 15 kW Units
Transfer switches for use with these generators
are sold separately and can be purchased from
Authorized Dealers.
• Install the transfer switch on a firm, sturdy sup-
porting structure.
• To prevent switch distortion, level the switch if
necessary. This can be done by placing washers
between the switch enclosure and mounting sur-
face.
• Never install the switch where water or any corro-
sive substance might drip onto the enclosure.
• Protect the switch at all times against excessive
moisture, dust, dirt, lint, construction grit and cor-
rosive vapors.
• Failure to utilize the manufacturer’s transfer switch
with this generator may void the warranty.
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Section 1 — General Information
Air-cooled 7 kW, 12 kW and 15 kW Generators
8