Generac 6.8L User Manual
Serial Number
STANDBY GENERATOR
OWNER'S MANUAL
QT
6.8L
100kW
Models
A new standard of reliability
This manual should remain with the unit.
Part No. 0F3605
Cover010 Rev. 0 08/05
Standby Generator Sets
Table of Contents
SECTION PAGE
SAFETY RULES ................................................ 1-1
INTRODUCTION .....................................................1-3
Read this Manual Thoroughly ...................................1-3
Operation and Maintenance ......................................1-3
How to Obtain Service ..............................................1-3
IDENTIFICATION RECORD .....................................2-1
Data Label ................................................................2-1
EQUIPMENT DESCRIPTION ...................................3-1
Equipment Description ................................................3-1
Engine Oil Recommendations ......................................3-1
Coolant Recommendations...........................................3-1
ENGINE PROTECTIVE DEVICES ............................4-1
Coolant Temperature Sensing ...................................4-1
Low Coolant Level .....................................................4-1
Oil Pressure Sensing .................................................4-1
Overcrank Shutdown ................................................4-1
Overspeed Shutdown ................................................4-1
RPM Sensor Loss Shutdown .....................................4-1
DC Fuse ....................................................................4-1
FUEL SYSTEMS .....................................................5-1
Fuel Requirements ....................................................5-1
Natural Gas Fuel System ..........................................5-1
Propane Vapor Withdrawal Fuel System....................5-1
LP Fuel System .........................................................5-1
SPECIFICATIONS ...................................................6-1
Generator .................................................................6-1
Engine.......................................................................6-1
Cooling System .........................................................6-1
Fuel System ..............................................................6-1
Electrical System ......................................................6-1
Cold Weather Kit .......................................................6-2
5.4L & 6.8L Ignition Description .................................6-3
Ignition Power-up Input (“56 Line Input”) .................6-3
Ignition Enable (“14 Line Input”) ..............................6-3
Ignition Shutdown on Loss of Crank
or CAM Signals .........................................................6-3
Diagnostic Blink Patterns (Red LED Located
on the Ignition Control Board ...................................6-3
GENERAL INFORMATION .......................................7-1
Generator AC Lead Connections ..................................7-1
Four-lead, Single-phase Stator ..................................7-1
Alternator Power Winding Connections ........................7-1
3-phase Alternators ..................................................7-1
INSTALLATION .......................................................8-1
Installation ...................................................................8-1
Preparation Before Start-up .........................................8-1
Transfer Switch ........................................................8-1
Fuel System ..............................................................8-1
Generator Set Lubrication ........................................8-1
Prior to Initial Start-up .............................................8-1
Initial Inspection for QT Genset Start-up .....................8-2
Start-up Inspection ...................................................8-2
OPERATION ...........................................................9-1
Generator Control and Operation ................................9-1
Operating Unit with Automatic Transfer Switch ...........9-1
Operating Unit with Manual Transfer Switch ...............9-1
Engine Start-up and Transfer ...................................9-1
Retransfer and Shutdown .........................................9-1
MAINTENANCE .....................................................10-1
Maintenance Performed by Authorized
Service Facilities .....................................................10-1
Cooling System ..........................................................10-1
Checking Fluid Levels ................................................10-1
Check Engine Oil ....................................................10-1
Battery Fluid ...........................................................10-1
Engine Coolant .......................................................10-2
Maintenance Owner/Operator Can Perform ................10-2
Check Engine Oil Level ...........................................10-2
Check Battery .........................................................10-2
Exercise System ......................................................10-2
Inspect Cooling System ...........................................10-2
Check Engine Coolant Level....................................10-2
Perform Visual Inspection .......................................10-2
Inspect Exhaust System ..........................................10-2
Check Fan Belt ........................................................10-2
Inspect Engine Governor ........................................10-2
Changing Engine Oil ...............................................10-2
Changing the Engine Air Cleaner ............................10-3
Spark Plugs ............................................................10-3
Coolant Change .......................................................10-3
Miscellaneous Maintenance ........................................10-3
Cleaning the Generator ...........................................10-3
Battery ....................................................................10-4
Battery Maintenance ...............................................10-4
Battery Replacement ...............................................10-4
SERVICE SCHEDULE ...........................................11-1
30 kW - 150 kW Standby Gas Engine
Driven Generator Sets ............................................11-1
TROUBLESHOOTING ...........................................12-1
Troubleshooting Guide ...............................................12-1
NOTES
EXPLODED VIEWS & PARTS LISTS
WIRING DIAGRAMS & SCHEMATICS
WARRANTY
Content003 Rev. 0 08/05
Standby Generator Sets
Important Safety Instructions
SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe
operation be copied and posted in potential hazard areas. Safety should be stressed to all
operators, potential operators, and service and repair technicians for this equipment.
The engine exhaust from this product
contains chemicals known to the state
This product contains or emits chemicals
known to the state of California to cause
cancer, birth defects or other reproductive harm.
Study these SAFETY RULES carefully before installing, 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 warnings in this manual, and on tags and decals affixed
to the unit are, therefore, not all inclusive. If a procedure, work method or operating technique is used
that the manufacturer does not specifically recommend, ensure that it is safe for others. Also make
sure the procedure, work method or operating technique utilized does not render the generator unsafe.
WARNING:
of California to cause cancer, birth
defects or other reproductive harm.
WARNING:
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 install, 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.
GENERAL HAZARDS
• For safety reasons, the manufacturer recommends
that this equipment be installed, serviced and
repaired by an Authorized Service Dealer or other
competent, qualified electrician or installation technician who is familiar with applicable codes, standards and regulations. The operator also must
comply with all such codes, standards and regulations.
• Installation, operation, servicing and repair of this
(and related) equipment must always 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, operated and serviced in
accordance with the manufacturer’s instructions
and recommendations. Following installation, do
nothing that might render the unit unsafe or in
noncompliance with the aforementioned codes,
standards, laws and regulations.
• The engine exhaust fumes contain carbon monoxide gas, which can be DEADLY. This dangerous gas,
if breathed in sufficient concentrations, can cause
unconsciousness or even death. For that reason,
adequate ventilation must be provided. Exhaust
gases must be piped safely away from any building
or enclosure that houses the generator to an area
where people, animals, etc., will not be harmed.
This exhaust system must be installed properly, in
strict compliance with applicable 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 ventilating air is critical in any room or building housing the generator to prevent buildup of explosive
gases and to ensure correct generator operation.
Do not alter the installation or permit even partial
blockage of ventilation provisions, as this can seriously affect safe operation of the generator.
• Keep the area around the generator clean and
uncluttered. Remove any materials that could
become hazardous.
• 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 promptly
repair or replace all worn, damaged or defective
parts using only factory-approved parts.
1-1
Safety 001 Rev. 0 08/05
Standby Generator Sets
Important Safety Instructions
• Before performing any maintenance on the generator, 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 conditions 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 well as the standby generator. Avoid contact
with bare wires, terminals, connections, etc., on
the generator as well as the transfer switch, if
applicable. Ensure all appropriate covers, guards
and barriers are in 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.
• If personnel must stand on metal or concrete while
installing, operating, servicing, adjusting or repairing this equipment, place insulative mats over a
dry wooden platform. Work on the equipment only
while standing on such insulative mats.
• The National Electrical Code (NEC) requires the
frame and external electrically conductive parts
of the generator to be connected to an approved
earth ground. This grounding will help prevent
dangerous electrical shock that might be caused
by a ground fault condition in the generator set or
by static electricity. Never disconnect the ground
wire.
• Wire gauge sizes of electrical wiring, cables and
cord sets must be adequate to handle the maximum electrical current (ampacity) to which they
will be subjected.
• Before installing or servicing this (and related)
equipment, make sure that all power voltage
supplies are positively turned off at their source.
Failure to do so will result in hazardous and possibly fatal electrical shock.
• Connecting this unit to an electrical system normally supplied by an electric utility shall be by
means of a transfer switch so as to isolate the
generator electric system from the electric utility
distribution system when the generator is operating. Failure to isolate the two electric system power
sources from each other by such means will result
in damage to the generator and may also result
in injury or death to utility power workers due to
backfeed of electrical energy.
Safety 001 Rev. 0 08/05
• Generators installed with an automatic transfer
switch will crank and start automatically when
normal (utility) source voltage is removed or is
below an acceptable preset level. To prevent such
automatic start-up and possible injury to personnel, disable the generator’s automatic start circuit
(battery cables, etc.) before working on or around
the unit. Then, place a “Do Not Operate” tag on
the generator control panel and on the transfer
switch.
• In case of accident caused by electric shock, immediately 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 dry 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 equipment. Jewelry can conduct electricity resulting in
electric shock, or may get caught in moving components causing injury.
FIRE HAZARDS
• Keep a fire extinguisher near the generator at all
times. Do NOT use any carbon tetra-chloride type
extinguisher. Its fumes are toxic, and the liquid
can deteriorate wiring insulation. Keep the extinguisher properly charged and be familiar with its
use. If there are any questions pertaining to fire
extinguishers, consult the local fire department.
EXPLOSION HAZARDS
• Properly ventilate any room or building housing
the generator to prevent build-up of explosive gas.
• Do not smoke around the generator. Wipe up any
fuel or oil spills immediately. Ensure that no combustible materials are left in the generator compartment, or on or near the generator, as FIRE or
EXPLOSION may result. Keep the area surrounding the generator clean and free from debris.
• These generator sets may operate using one of
several types of fuels. All fuel types are potentially
FLAMMABLE and/or EXPLOSIVE and should be
handled with care. Comply with all laws regulating the storage and handling of fuels. Inspect the
unit’s fuel system frequently and correct any leaks
immediately. Fuel supply lines must be properly installed, purged and leak tested according to
applicable fuel-gas codes before placing this equipment into service.
• Diesel fuels are highly FLAMMABLE. Gaseous
fluids such as natural gas and liquid propane
(LP) gas are extremely EXPLOSIVE. Natural gas
is lighter than air, and LP gas is heavier than air;
install leak detectors accordingly.
1-2
Standby Generator Sets
Important Safety Instructions
INTRODUCTION
Thank you for purchasing this model of the standby
generator set product line.
Every effort was expended to make sure that the
information and instructions in this manual were
both accurate and current at the time the manual was
written. However, the manufacturer reserves the right
to change, alter or otherwise improve this product(s)
at any time without prior notice.
READ THIS MANUAL THOROUGHLY
If any portion of this manual is not understood, contact the nearest Authorized Service 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 personnel to special instructions about a particular service
or operation that may be hazardous if performed
incorrectly or carelessly. Observe them carefully.
Their definitions are as follows:
DANGER
After this heading, read instructions that, if not
strictly complied with, will result in personal injury
or property damage.
After this heading, read instructions that, if not
strictly complied with, may result in personal
injury or property damage.
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 recommends that the operator read this Owner's Manual
and thoroughly understand all instructions before
using this equipment. The manufacturer also strongly recommends instructing other users to properly
start and operate the unit. This prepares them if they
need to operate the equipment in an emergency.
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
Service 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 ensure
a minimum number of problems and keep operating
expenses at a minimum. See an Authorized Service
Dealer for service aids and accessories.
Operating instructions presented in this manual
assume that the standby electric system has been
installed by an Authorized Service Dealer or other
competent, qualified contractor. Installation of this
equipment is not a “do-it-yourself” project.
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 compliance 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 infor-
mation that, if not followed, could endanger
personal safety and/or property of others.
This symbol points out potential explosion
hazard.
HOW TO OBTAIN SERVICE
When the generator requires servicing or repairs,
simply contact an Authorized Service Dealer for
assistance. Service technicians are factory-trained
and are capable of handling all service needs.
When contacting an Authorized Service Dealer or the
factory about parts and service, always supply the
complete model number of the unit as given on the
front cover of this manual or on the DATA LABEL
affixed to the unit.
AUTHORIZED SERVICE DEALER LOCATION
To locate the nearest AUTHORIZED
SERVICE DEALER, please call this number:
1-800-333-1322
or locate us on the web at:
www.generac.com
1-3
Safety 001 Rev. 0 08/05
Standby Generator Sets
General Information
IDENTIFICATION RECORD
DATA LABEL
Every generator set has a DATA LABEL that contains
important information pertinent to the generator. The
data label, which can be found attached to the generator’s lower connection box, lists the unit’s serial
number and its rated voltage, amps, wattage capacity,
phase, frequency, rpm, power factor, etc.
GENERATOR SET DATA
MODEL
RATED KW
RATED VOLTAGE
POWER FACTOR
ENGINE RPM
ALTERNATOR SUBTRANSIENT REACTANCE
ALTERNATOR TRANSIENT REACTANCE
CLASS
ROTOR STATOR WINDING INSULATION AT 25°C AMBIENT
GENERAC POWER SYSTEMS, INC.
RATED KVA
SERIAL
RATED AMPS
HERTZ
PRODUCTION DATE
WAUKESHA, WI
NOTE:
For actual information related to this particular
model, please refer to the Manual Drawing Listing
located at the end of this manual, or to the data
label affixed to the unit.
Generator Model and Serial Number
This number is the key to numerous engineering and
manufacturing details pertaining to your unit. Always
supply this number when requesting service, ordering parts or seeking information.
MADE IN USA
PHASE
ALT RPM
Identification Code
Use this code to obtain important information about
the generator. For example, if the code is:
M Q T 1 0 0 5 4 A N S N A
M — Designates generators capable of paralleling.
NOTE: Only 100kW and 150kW, 6.8L units
are currently available for this configuration.
QT — Quiet Test Generator Series
100 — kw Rating
5.4 — Engine Size in Liters
A — Voltage Code: A = 120/240, Single-phase;
G = 120/208, Three-phase; K = 277/480,
Three-phase; J = 120/240, Three-phase;
L = 346/600, Three-phase
N — Fuel: N = Natural Gas; V = Vapor Propane
S — Enclosure Material: A = Aluminum; S
= Steel (Corrosion Resistant Aluminum
Enclosure Material, Steel is Standard)
N — Emission Equipment: N = No Equipment;
Y = Catalytic Converter and Air/Fuel Ratio
Controller
A — Industrial Dealer Product
Voltage Codes
The identification code letter following the unit’s
engine size is the generator’s “voltage code.”
Groups and Assembly Numbers
The manual drawing listing lists the groups and corresponding assembly numbers for each unit. The
assembly numbers refer to exploded view drawing
numbers that are applicable to the specific generator
model. These drawings are located in the back half
of this manual.
2-1
Identy001 Rev. C 04/06
Standby Generator Sets
Equipment Description
EQUIPMENT DESCRIPTION
This equipment is a revolving field, alternating current generator set. It is powered by a gaseous fueled
engine operating at 1800 rpm for 4-pole direct drive
units, 3600 rpm for 2-pole direct drive units and
2300 - 3000 rpm for quiet drive gear units. See the
Specifications section for exact numbers. The unit
comes complete with a sound attenuated enclosure,
internally mounted muffler, control console, mainline circuit breaker, battery charger, and protective
alarms as explained in the following paragraph.
All AC connections, including the power leads from
the alternator, 120 volt battery charger input and
control connections to the transfer switch are available in the main connection box.
The generator incorporates the following generator
features:
• Rotor and Stator insulation is Class H rated as
defined by NEMA MG1-32.6, NEMA MG1-1.66.
The generator is self ventilated and drip-proof constructed.
• The voltage waveform deviation, total harmonic
content of the AC waveform and telephone influence factor have been evaluated and are acceptable
according to NEMA MG1-32.
ENGINE OIL RECOMMENDATIONS
The unit has been filled with 15W-40 engine oil at
the factory. Use a high-quality detergent oil classified
“For Service CC, SD, SE, SF.” Detergent oils keep the
engine cleaner and reduce carbon deposits. Use oil
having the following SAE viscosity rating, based on
the ambient temperature range anticipated before the
next oil change:
COOLANT RECOMMENDATIONS
Use a mixture of half low silicate ethylene glycol
base anti-freeze and deionized water. Cooling system
capacity is listed in the specifications. Use only deionized water and only low silicate anti-freeze. If desired,
add a high quality rust inhibitor to the recommended
coolant mixture. When adding coolant, always add
the recommended 50-50 mixture.
Do not use any chromate base rust inhibitor
with ethylene glycol base anti-freeze or chromium hydroxide (“green slime”) forms and will
cause overheating. Engines that have been operated with a chromate base rust inhibitor must
be chemically cleaned before adding ethylene
glycol base anti-freeze. Using any high silicate
anti-freeze boosters or additives will also cause
overheating. The manufacturer also recommends
that any soluble oil inhibitor is NOT used for this
equipment.
DANGER
Do not remove the radiator pressure cap while
the engine is hot or serious burns from boiling
liquid or steam could result.
Ethylene glycol base antifreeze is poisonous.
Do not use mouth to siphon coolant from the
radiator, recovery bottle or any container. Wash
hands thoroughly after handling. Never store
used antifreeze in an open container because
animals are attracted to the smell and taste of
antifreeze even though it is poisonous to them.
Temperature Oil Grade (Recommended)
Above 80° F (27° C) SAE 30W or 15W-40
32° to 80° F (0° to 27° C) SAE 20W-20 or 15W-40
Below 32° F (0° C) See Note
Any attempt to crank or start the engine before
it has been properly serviced with the recommended oil may result in an engine failure.
NOTE:
For temperatures below 32° F, it is strongly recommended to use the optional Cold Weather Start Kit
(part number listed in the Specification Section).
The oil grade for temperatures below 32° F is 5W30 synthetic oil.
3-1
Equip001 Rev. 0 08/05
Standby Generator Sets
Engine Protective Devices
ENGINE PROTECTIVE DEVICES
The standby generator may be required to operate for
long periods of time without an operator on hand to
monitor such engine conditions as coolant temperature, oil pressure or rpm. For that reason, the engine
has several devices designed to protect it against
potentially damaging conditions by automatically
shutting down the unit when the oil pressure is too
low, the coolant temperature is too high, the coolant
level is too low, or the engine is running too fast.
NOTE:
Engine protective switches and sensors are mentioned here for the reader's convenience. Also refer
to the applicable control panel manual for additional automatic engine shutdown information.
COOLANT TEMPERATURE SENSING
An analog Water Temperature Sender (WTS) is located in the engine's cooling system. This sender is connected to the panel and allows the panel to monitor
and display the temperature of the coolant system.
The WTS is a resistive device whose resistance changes based on coolant temperature. The resistance of
the sender results in a voltage being developed across
the sender. As the Coolant temperature increases,
the resistance will decrease, causing the voltage to
decrease. This changing voltage is converted to 420mA signal by a signal conditioner module. The
corresponding 4-20mA signal is read by the control
panel and displayed as the coolant temperature.
The control panel will monitor and display the coolant temperature anytime the DC input to the control
panel is present.
If the temperature exceeds approximately 140° C
(284° F), the engine shutdown will be initiated. The
generator will automatically restart and the display
will reset once the temperature has returned to an
operating level.
LOW COOLANT LEVEL
A Low Coolant Level (LCL) sensor is placed in the
generators coolant system. This sensor allows the
panel to detect a Low Coolant Level condition.
The LCL is a resistive device whose resistance changes
rapidly based on the presence or absence of coolant.
The resistance of the LCL results in a voltage being
developed across the LCL. This voltage changes as
the resistance changes. This changing voltage is converted to 4-20mA signal by a signal conditioner module. The corresponding 4-20mA signal is read by the
control panel and displayed as the low coolant level.
If the level of the engine coolant drops below the level
of the low coolant level sensor, the engine shutdown
will be initiated.
OIL PRESSURE SENSING
An analog Oil Pressure Sender (OPS) is used for
monitoring the engine oil pressure. This sender
allows the control panel to measure and display the
Engine oil pressure.
The OPS is a resistive device, whose resistance
changes based on engine oil pressure. The resistance
of the sender results in a voltage being developed
across the sender. As the oil pressure increases,
the resistance will decrease, causing the voltage to
decrease. This changing voltage is converted to 420mA signal by a signal conditioner module. The
corresponding 4-20mA signal is read by the control
panel and displayed as the oil pressure.
The control panel will monitor and display oil pressure anytime the DC input to the control panel is
present.
Should the oil pressure drop below the 8 psi range,
the engine shutdown is initiated. The unit should not
be restarted until oil is added. Turn the AUTO/OFF/
MANUAL switch to the OFF position, then back to
AUTO to restart.
OVERCRANK SHUTDOWN
When the control panel receives a start signal, it initiates the programmed starting sequence. The start
sequence consists of the number of crank attempts,
the length of each crank attempt, and the rest time
between each crank attempt. If the engine has not
started by the end of the final crank attempt, an
Overcrank alarm is generated, the control panel will
sound the alarm and display the message "Failed to
start".
OVERSPEED SHUTDOWN
A speed circuit controls engine cranking, start-up,
operation and shutdown. Engine speed signals are
delivered to the circuit board whenever the unit is
running. Should the engine over speed above a safe,
preset value, the circuit board initiates an automatic
engine shutdown. Contact the nearest Authorized
Dealer if this failure occurs.
RPM SENSOR LOSS SHUTDOWN
If the speed signal to the control panel is lost, engine
shutdown will occur.
DC FUSE
This fuse is located inside of the control panel. It
protects the panel wiring and components from
damaging overload. Always remove this fuse before
commencing work on the generator. The unit will
not start or crank if the fuse is blown. Replace the
fuse with one of the same size, type, and rating. (See
the exploded views and parts lists at the end of this
manual for replacement part number.)
4-1
EngProt002 Rev. B 10/05
Standby Generator Sets
Fuel Systems
FUEL SYSTEM
FUEL REQUIREMENTS
The standby generator may be equipped with one of
the following fuel systems:
• Natural gas fuel system
• Propane vapor (PV) fuel system
• Liquid propane (LP) fuel system
The Manual Drawing Listing that is affixed to the
unit includes the “Identification Code,” which may be
used to identify the type of fuel system installed on
the unit.
Recommended fuels should have a Btu content of at
least 1,000 Btu's per cubic foot for natural gas; or at
least 2,520 Btu's per cubic foot for LP gas. Ask the
fuel supplier for the Btu content of the fuel.
Required fuel pressure for natural gas is 11 inches
to 14 inches water column (0.4 to 0.5 psi); and for
liquid propane, 11 inches to 14 inches of water
column (0.4 to 0.5 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 11 inches
water column for natural gas or 11 inches water
column for liquid propane for all load ranges.
NOTE:
It is the responsibility of the installer to make sure
that only the correct recommended fuel is supplied to the generator fuel system. Thereafter, the
owner/operator must make certain that only the
proper fuel is supplied.
NATURAL GAS FUEL SYSTEM
Natural gas is supplied in its vapor state. In most
cases, the gas distribution company provides piping
from the main gas distribution line to the standby
generator site. The following information applies to
natural gas fuel systems.
• Gas pressure in a building is usually regulated by
national, state and local codes.
• To reduce gas pressure to a safe level before
the gas enters a building, a primary regulator is
needed. The natural gas supplier may or may not
supply such a regulator.
• It is the responsibility of the gas supplier to make
sure sufficient gas pressure is available to operate
the primary regulator.
• Gas pressure at the inlet to the fuel shutoff solenoid should not exceed approximately 14 inches
water column (0.5 psi). Optimum pressure at the
fuel shutoff solenoid is 11 inches water column
(0.4 psi).
PROPANE VAPOR WITHDRAWAL FUEL SYSTEM
This type of system utilizes the vapors formed above
the liquid fuel in the supply tank. Approximately 10
to 20 percent of the tank capacity is needed for fuel
expansion from the liquid to the vapor state. The
vapor withdrawal system is generally best suited for
smaller engines that require less fuel. The installer
should be aware of the following:
• The natural gas and LP gas systems are similar.
However, the natural gas system delivers gas at a
pressure of approximately five inches water column to the carburetor.
• When ambient temperatures are low and engine
fuel consumption is high, the vapor withdrawal
system may not function efficiently.
• Ambient temperatures around the supply tank
must be high enough to sustain adequate vaporization, or the system will not deliver the needed fuel
volume.
• In addition to the cooling effects of ambient air, the
vaporization process itself provides an additional
cooling effect.
LP FUEL SYSTEM
LP is supplied as a liquid in pressure tanks. It is
usually made up of propane, butane, or a mixture of
the two gases. Propane tends to vaporize readily even
at temperatures as low as -20° F (-29° C). However,
butane reverts to its liquid state when temperatures
drop below 32° F (0° C).
LP in a liquid withdrawal system must be converted
to its gaseous state before it is introduced into the
engine carburetor. A vaporizer-converter is generally
used to accomplish this. In such a converter, heated
engine coolant is ported through the converter to
provide the necessary heat for conversion of the fuel
from a liquid to a gaseous state.
5-1
FuelSys002 Rev. A 05/06
Standby Generator Sets
Specifications
SPECIFICATIONS
GENERATOR
Type ............................................................................. Synchronous
Rotor Insulation ................................................................... Class H
Stator Insulation .................................................................. Class H
Total Harmonic Distortion ......................................................< 3.5%
Telephone Interference Factor (TIF) .......................................... < 50
Alternator Output Leads 3-phase ........................................... 6-wire
Bearings .........................................................................Sealed Ball
Coupling ..........................................................................Gear Drive
Load Capacity (Standby Rating) ..........................................100kW*
* NOTE: Generator rating and performance in accordance with ISO8528-5, BS5514, SAE J1349,
ISO3046 and DIN 6271 Standards. KW rating is based on LPG fuel and may derate with natural
gas.
Excitation System ............................................................. Brushless
Generator Output Voltage/kW - 60 Hz kW Amp CB Size
120/240V, 1-phase, 1.0 pf 100 417 450
120/208V, 3-phase, 0.8 pf 100 347 400
277/480V, 3-phase, 0.8 pf 100 150 175
Generator Locked Rotor KVA Available @ Voltage Dip of 35%
Single-phase or 208 3-phase ........................................... 200 KVA
480V, 3-phase .................................................................. 240 KVA
ENGINE
Make ................................................................................... Generac
Model ...................................................................................... V-type
Cylinders and Arrangement .......................................................... 10
Displacement ....................................................................... 6.8 Liter
Bore ...................................................................................... 3.55 in.
Stroke ................................................................................... 4.17 in.
Compression Ratio ..................................................................9-to-1
Air Intake System ...............................................Naturally Aspirated
Valve Seats ....................................................................... Hardened
Lifter Type .......................................................................... Hydraulic
Engine Parameters
Rated Synchronous RPM ..............................................60 Hz, 2300
HP at rated kW ................................................................60 Hz, 168
Exhaust System
Exhaust Flow at Rated Output 60 Hz .................................. 888 cfm
Exhaust Temperature at Rated Output .................................. 960° F
Combustion Air Requirements (Natural Gas)
Flow at rated power, 60 Hz ................................................. 262 cfm
Governor
Type .................................................................................. Electronic
Frequency Regulation ...................................................Isochronous
Steady State Regulation ......................................................± 0.25%
Adjustments:
Speed ............................................................................ Selectable
Engine Lubrication System
Type of Oil Pump ...................................................................... Gear
Oil Filter .............................................................Full Flow, Cartridge
Crankcase Oil Capacity .................................................... 6 U.S. qts.
COOLING SYSTEM
Type ....................................................................................... Closed
Water Pump .................................................................... Belt Driven
Fan Speed ................................................................................ 1670
Fan Diameter .....................................................................26 inches
Fan Mode ................................................................................Puller
Air Flow (inlet air including alternator and
combustion air) .......................................................... 5500 ft3/min.
Coolant Capacity ........................................................ (4.5 U.S. gal.)
Heat Rejection to Coolant ..........................................342,000 Btu/h
Maximum Operating Air Temp. on Radiator .............. 60° C (150° F)
Maximum Ambient Temperature ................................50° C (140° F)
FUEL SYSTEM
Type of Fuel ..................................................LP Vapor/Natural Gas*
Carburetor ...................................................................... Down Draft
Secondary Fuel Regulator .................................................Standard
Fuel Shut-off Solenoid ........................................................Standard
Operating Fuel Pressure .................... 11 in. - 14 in. Water Column
Fuel Consumption - ft3/hr (Natural Gas/LPV)
Exercise 25% 50% 75% 100%
Cycle Load Load Load Load
130/52 371/149 713/287 991/400 1260/507
* Engine is not field convertible between natural gas and propane. Jet size and ignition timing are
factory set for the specific fuel.
ELECTRICAL SYSTEM
Battery Charge Alternator ............................................12V, 30 Amp
Static Battery Charger ....................................................12V, 2 Amp
Recommended Battery ................................................ 24F 525CCA
System Voltage .....................................................................12 Volts
Voltage Regulator
Type ................................................................................. Full Digital
Sensing ................................................................................ 3-phase
Regulation .............................................................................± 1/4%
Features ............................................ Built into H-100 Control Panel
V/F Adjustable, Adjustable
Voltage and Gain
Power Adjustment for Ambient Conditions
Temperature Deration
3% for every 10° C above °C ..................................................... 25
1.65% for every 10° above °F .................................................... 77
Altitude Deration
1% for every 100 m above m ................................................... 183
3% for every 1000 ft. above ft. ................................................. 600
Controller .............................................. H-panel
6-1
GenSpec009 Rev. C 11/05
Standby Generator Sets
Specifications
Figure 1 — Interconnections
COLD WEATHER KIT
For cold climates, optional cold weather kit (part number 0F6148A) is recommended. The kit includes:
• Battery Warmer
• 4” Junction Box with hardware
• 700 Cold Cranking Amp Battery
• 6 qt. pack 5W-30 synthetic oil (engine)
• 1 qt. 75W90 synthetic gear oil (gear drive)
GenSpec009 Rev. C 11/05
6-2
Standby Generator Sets
Specifications
5.4L & 6.8L IGNITION DESCRIPTION
This single-fire Ignition is intended to operate with
a 10-cylinder, 6.8L engine and an 8-cylinder, 5.4L
engine.
The 6.8L engine uses a 40-1 crank sensor, a magpickup CAM sensor and individual coil-on-plug coils
for each spark-plug.
The 5.4L engine uses a 36-1 crank sensor, a magpick-up CAM sensor and individual coil-on-plug coils
for each spark-plug.
With a single-fire ignition, each high-voltage coil output is connected to one spark plug resulting in that
spark plug being fired only during the compression
cycle.
Engine Timing versus Engine Speed for the 6.8L
engine is:
RPM NG/LP Engine Timing (BTDC)
1800 rpm 22 degrees
3600 rpm 24 degrees
Engine Timing versus Engine Speed for the 5.4L
engine is:
RPM NG/LP Engine Timing (BTDC)
1800 rpm 26 degrees
3600 rpm 26 degrees
IGNITION POWER-UP INPUT ("56 LINE
INPUT")
When battery voltage is applied to this input the ignition will power-up. For the ignition to power itself
down, battery voltage must be removed from this
input.
NOTE:
The ignition cover does not need to be removed to
see the LED.
IGNITION SHUTDOWN ON LOSS OF CRANK
OR CAM SIGNALS
The ignition will stop firing the coils immediately following the loss of the crank signal. The ignition will
stop firing the coils after approx. 3 seconds following
the loss of the cam signal.
DIAGNOSTIC BLINK PATTERNS (RED LED
LOCATED ON THE IGNITION CONTROL
BOARD)
During normal ignition operation the RED LED
flashes at a 0.5 sec ON and a 0.5 sec OFF rate. This
is considered one (1) blink.
LED Fault Code with Priority as shown:
1. No Crank Signal: LED blinks 2 times, is OFF for
3.0 seconds and then repeats
2. No CAM Signal: LED blinks 3 times, is OFF for
3.0 seconds and then repeats
Only one fault is displayed at a time. If multiple faults
exist then the highest priority fault must be resolved
prior to a lower priority fault being displayed. In the
event that an ignition fault has occurred the ignition
will wait 60 seconds before powering down.
NOTE:
The ignition cover does not need to be removed to
see the LED.
IGNITION ENABLE ("14 LINE INPUT")
This input must be connected to the +12V battery for
the ignition to turn-on the coils. If this input is connected to battery ground the ignition will stop firing
the coils and will power down within approximately
2 seconds. In the event that an ignition fault has
occurred, however, the ignition will wait 60 seconds
before powering down. This allows time to view the
diagnostic LED located on the ignition board.
6-3
GenSpec009 Rev. C 11/05
Standby Generator Sets
General Information
GENERATOR AC LEAD CONNECTIONS
See “Voltage Codes”. This generator may be rated
at any one of three voltages, either single-phase or
three-phase. The electrical wires in the unit’s AC connection (lower) panel should be installed according to
the number of leads and the voltage/phase required
for the application. If there are any questions regarding lead connection, refer to the wiring diagrams at
the back of this manual.
Voltage codes apply to the type of stator assembly
installed on a particular generator.
FOUR-LEAD, SINGLE-PHASE STATOR
Four-lead generators are built to supply electrical
loads with voltage code "A" (240V, 1-phase, 60Hz).
Electrical power is produced in the stator power
windings. These windings were connected at the factory to the main circuit breaker as shown in Figure
7.1.
The rated voltage between each circuit breaker terminal is 240V. The rated voltage between each circuit
breaker terminal and the neutral point 00 is 120V.
Figure 7.1 — Four-lead, Single-phase Stator
ALTERNATOR POWER WINDING
CONNECTIONS
3-PHASE ALTERNATORS
The generator is designed to supply 3-phase electrical loads. Electric power is produced in the alternator power windings. These windings were connected
at the factory to the main circuit breaker with a “Y”
configuration as shown in Figures 7.2 and 7.3.
The rated voltage between circuit breaker terminals
E1-E2, E1-E3 and E2-E3 is either 480V or 208V
depending on the model.
The rated voltage between each circuit breaker terminal and the neutral point 00 is either 277V or 120V
depending on the model.
Figure 7.2 — Stator Power Winding
Connections - 3-phase, 277/480V (12 Lead)
E1
S1
S4
S7
L - L
S10
S11
S8
L - N
S5
S2
E2
S3
E3
S6
S12
S9
Figure 7.3 — Stator Power Winding
Connections - 3-phase, 120/208V (12 Lead)
E1
S7 S1
S10
S12
S9
S6
E3
S3
S11
S4
S5
S8
L - N
L - L
S2
E2
7-1
ACConn002 Rev. 0 08/05
Standby Generator Sets
Installation
INSTALLATION
Refer to the separate “Installation Guide QT Product
Line” supplied with the unit.
PREPARATION BEFORE START-UP
The instructions in this section assume that the
standby generator has been properly installed, serviced, tested, adjusted and otherwise prepared for
use by a competent, qualified installation contractor.
Be sure to read the “Safety Rules”, as well as all other
safety information in this manual, before attempting
to operate this (and related) equipment.
Before starting the generator for the first time, the
installer must complete the following procedures. For
follow-up maintenance information and/or service
intervals, please refer to the “Maintenance” section
and the “Service Schedule”.
TRANSFER SWITCH
If this generator is used to supply power to any electrical system normally powered by an electric utility,
the National Electrical Code requires that a transfer
switch be installed. The transfer switch prevents electrical backfeed between two different electrical systems. (For additional information, see the applicable
transfer switch manual for this unit.) The transfer
switch, as well as the generator and other standby
components, must be properly located and mounted
in strict compliance with applicable codes, standards
and regulations.
FUEL SYSTEM
Make sure the fuel supply system to the generator (a) delivers the correct fuel at the correct pressure and (b) is properly purged and leak tested
according to code. No fuel leakage is permitted. See
“Specifications” for more information.
GENERATOR SET LUBRICATION
Check the engine crankcase oil level before operating
and add oil to the proper level – the dipstick “FULL”
mark. Never operate the engine with the oil level
below the dipstick “ADD” mark. See “Specifications”
and “Engine Oil Recommendations”.
NOTE:
This engine is shipped from the manufacturer
with “break-in” oil. This oil should be changed
after 30 hours of operation.
Check the oil level in the generator gearbox (if so
equipped) prior to initial use and at the intervals
indicated by the “Service Schedule.” The recommended oil is SAE 90 gear lubricant.
Also, if the engine is equipped with a mechanical governor, make sure the governor is properly lubricated
with clean engine oil.
PRIOR TO INITIAL START-UP
Prior to initially starting the generator, it must
be properly prepared for use. Any attempt to
crank or start the engine before it has been
properly serviced with the recommended types
and quantities of engine fluids (oil, coolant, fuel,
etc.) may result in an engine failure.
ENGINE COOLANT
Have the engine cooling system properly filled with
the recommended coolant mixture. Check the system
for leaks and other problems. See “Specifications”
and “Coolant” sections.
BELT TENSION
Check-the engine-fan belt tension and condition prior
to placing the unit into service and at recommended
intervals. Belt tension is correct when a force of
approximately 22 pounds (10 kg), applied midway
between pulleys, deflects the belt about 3/8- to 5/8inch (10 to 16 mm).
ELECTRICAL SYSTEM
Make sure the generator is properly connected to an
approved earth ground.
Make sure the generator battery is fully charged,
properly installed and interconnected, and ready for
use.
Check to ensure that there are no loose electrical connections. Restrain any loose wires to keep them clear
of any moving generator set components.
INITIAL INSPECTION FOR QT GENSET
STARTUP
Inspect for the following.
• Freight Damage.
• Manuals present.
• Fluid Levels (Oil, coolant, battery, Gear Drive).
• Correct fuel piping.
• Correct muffler installation for external application.
• Adequate air flow, clearances and ventilation per
installation drawings and applicable codes.
• Correct AC and DC wire size, connections and
grounding. Control and communication wiring to/
from the transfer switch must be run in a separate
conduit from the AC power leads.
• Battery charger connection to 120 VAC.
• Communication wires connected between transfer
switch and generator (HTS only).
• Unit secured to pad.
8-1
Install001 Rev. C 05/06
Standby Generator Sets
Installation
START-UP CHECKLIST
Before working on the generator, ensure the fol-
lowing:
• The AUTO/OFF/MANUAL switch is in the OFF
position.
• The 120VAC supply to the battery charger is
switched OFF.
PREPARATION FOR START-UP
• Ensure that the 120VAC circuit breaker to the battery charger is open.
• Remove the fuse from the the control panel. For
the H-100 and R-series: Open the front door of the
control box and remove the 15 Amp ATO fuse in
the lower left-hand corner of the control box.
• Connect the battery cables to the battery. Attach
negative battery cable last.
• Close the 120VAC circuit breaker to the battery
charger.
• Measure the voltage at the battery before and after
the charger is turned on.
• Verify all AC electrical connections are tight at the
circuit breaker and transfer switch.
• Visually inspect entire area looking for loose paper,
plastic wrappings, leaves, etc.
• Check all hoses clamps fittings for leaks or damage.
• Check all electrical plugs throughout the generator. Ensure each plug is seated correctly and fully
inserted into its receptacle.
• Verify the AUTO/OFF/MANUAL switch is in OFF
position.
• Open the valve to the engine fuel line.
• Bleed the fuel system of air. (necessary for long fuel
lines).
• Open the generator main line circuit breaker.
• Connect a manometer to the gas line and record
the static pressure. It must be as listed in the
Specifications.
• Insert the fuse into the control panel.
• Move the AUTO/OFF/MANUAL switch to the MANUAL position. The engine should now crank and
start.
• Check voltage at the generator terminals.
• For 3-phase units, check phase rotation at the
transfer switch terminals. The generator phase
rotation must match the utility phase rotation.
• Check for coolant, fuel, oil, and exhaust leaks.
• Close the generators main line circuit breaker.
• Turn the generator set off.
• Connect the UTILITY supply to the transfer
switch.
• Set the AUTO/OFF/MANUAL switch to AUTO.
• Disconnect utility power before the transfer
switch.
Engine should start, transfer to load.
Run at least 15 minutes on generator power.
Make certain all 3-phase loads are functioning
correctly (correct phase rotation).
• Reconnect Utility power
Transfer switch will transfer back to Utility and
engine will shut down within the given time
parameters set up for the specific transfer switch
and controller.
• Install all covers, access plates and door panels.
• Put the Owners Manual in a safe and accessible
place.
• Make certain the AUTO/OFF/MANUAL switch is in
the AUTO position.
START-UP INSPECTION
When a start-up is performed by an Authorized
Service Dealer, a standard three-part form titled
“Start-up Inspection for Standby Power Systems”
(part no. 067377), should be completed by the installation technician or engineer. See page 1-3 for information on locating the nearest Authorized Service
Dealer. The installer should complete the form and
disseminate copies as follows:
• White copy: Mail to Generac Warranty Department,
P.O. Box 340, 211 Murphy Dr., Eagle, WI 53119-
2062.
• Pink Copy: For service file of installing dealer.
• Yellow Copy: For the customer’s records.
Install001 Rev. C 05/06
8-2
GENERATOR CONTROL AND
Standby Generator Sets
Operation
OPERATION
Refer to the appropriate control panel operator’s
manual for this unit.
OPERATING UNIT WITH MANUAL
TRANSFER SWITCH
If the generator was installed in conjunction with a
transfer switch capable of manual operation only, the
following procedure applies. A manually operated
transfer switch is one that will not provide automatic
start-up and does not include an intelligence circuit.
ENGINE START-UP AND TRANSFER
For additional information, refer to the applicable
control panel manual for this unit, as well as any literature pertaining to the specific transfer switch.
DANGER
The Maintenance Disconnect Switch and the
AUTO/OFF/MANUAL switches (if so equipped)
must be set properly, or the generator will crank
and start as soon as the utility power to the
transfer switch is turned off. Refer to applicable
control panel and transfer switch manuals for
more information.
Do not proceed until certain that utility source
voltage is available to the transfer switch and
the transfer switch main contacts are set to
UTILITY.
Do not attempt manual operation until all power
supplies to the transfer switch have been positively turned off, or extremely dangerous - possibly lethal - electrical shock will result.
Transfer switch enclosure doors should be kept
closed and locked. Only authorized personnel
should be allowed access to the transfer switch
interior. Extremely high and dangerous voltages
are present in the transfer switch.
In order to transfer load from the utility source to the
generator, follow these directions:
• Turn OFF or disconnect the utility power circuit
to the transfer switch, using the means provided
(such as the utility source main line circuit breaker).
• Set the transfer handle to its UTILITY (NORMAL)
position with load circuits connected to the utility
power supply.
• Set the standby generator’s main line circuit breaker to its OFF (or OPEN) position.
• Start the generator.
Do not crank the engine continuously for longer
than 30 seconds, or the heat may
damage the starter motor.
• Let engine stabilize and warm up.
• Check all applicable instrument and gauge readings. When certain that all readings are correct,
move the transfer switch manual handle to its
STANDBY (GENERATOR) position, i.e., load circuits supplied by the generator.
• Set the standby generator’s main line circuit breaker to its ON (or CLOSED) position.
• Load circuits are now powered by the standby
generator.
RETRANSFER AND SHUTDOWN
For additional information, refer to the applicable
control panel manual for this unit, as well as any literature pertaining to the specific transfer switch.
To transfer the load back to the utility power source
and shut down the generator, follow these directions:
• Set the standby generator’s main line circuit breaker to its OFF (or OPEN) position.
• Manually move the transfer switch handle to its
UTILITY (NORMAL) position, i.e., load circuits
connected to the utility.
• Turn ON the utility power supply to the transfer
switch, using the means provided (such as the utility power source main line circuit breaker).
• Let the generator run at no-load for a few minutes
to stabilize internal temperatures.
• Shut down the generator.
OPERATING UNIT WITH AUTOMATIC
TRANSFER SWITCH
If the generator has been installed with an automatic
transfer switch, such as an RTS, HTS, or GTS-type
transfer switch, the engine may be started and
stopped automatically or manually.
NOTE:
Refer to the applicable manual for your transfer switch and to “Transfer Switch Start Signal
Connections”. In addition, please note the dangers
under “Engine Start-up and Transfer.”
9-1
Oper001 Rev. 0 08/05
MAINTENANCE PERFORMED BY
k
Standby Generator Sets
Maintenance
AUTHORIZED SERVICE FACILITIES
Before working on the generator, ensure the fol-
lowing:
• The AUTO/OFF/MANUAL switch is in the OFF
position.
• The 15A fuse has been removed from the control box.
• The 120VAC supply to the battery charger is
switched OFF.
EVERY THREE MONTHS
1. Check battery state of charge and condition.
2. Inspect and test fuel system.
3. Check transfer switch.
4. Inspect exhaust system.
5. Check engine ignition system.
6. Check fan belts.
ONCE EVERY SIX MONTHS
1. Test Engine Safety Devices (low oil pressure, low
coolant level, high coolant temperature).
The exhaust system parts from this product get
extremely hot and remain hot after shutdown.
High grass, weeds, brush, leaves, etc. must
remain clear of the exhaust. Such materials may
ignite and burn from the heat of the exhaust
system.
CHECKING FLUID LEVELS
CHECK ENGINE OIL
Check engine crankcase oil level (Figure 10.1) at least
every 20 hours of operation, or prior to use.
• Remove oil dipstick and wipe dry with a clean, lintfree cloth.
• Install oil dipstick, then remove again.
• Oil should be between FULL and ADD marks.
• If oil level is below the dipstick ADD mark,
remove oil fill cap. Add the recommended oil to
bring oil level up to the FULL mark. DO NOT
FILL ABOVE THE “FULL” MARK. See “Engine Oil
Recommendations” for recommended oils.
Figure 10.1 - Oil Dipstick and Oil Fill Cap
ONCE ANNUALLY
1. Test engine governor. Adjust or repair, if needed.
2. Clean, inspect generator.
3. Flush cooling system.
FIRST 100 OPERATING HOURS
1. Change engine oil and oil filter. (After initial
change, service engine oil and filter at 150 operating hours or 6 months, whichever comes first.)
EVERY 500 OPERATING HOURS
1. Service air cleaner.
2. Check starter.
3. Check engine DC alternator.
COOLING SYSTEM
Air intake and outlet openings in the generator compartment must be open and unobstructed for continued proper operation. This includes such obstructions as high grass, weeds, brush, leaves and snow.
Without sufficient cooling and ventilating air flow, the
engine/generator quickly overheats, which causes it
to shut down.
Oil Fill
Oil
Dipstic
Oil Filter
BATTERY FLUID
Check battery electrolyte fluid at least once weekly.
Fluid should cover separators in all battery cells. If
fluid level is low, add distilled water to cover tops of
separators. DO NOT USE TAP WATER IN BATTERY.
10-1
Maint004 Rev. 0 08/05
Standby Generator Sets
Maintenance
ENGINE COOLANT
Check coolant level in coolant recovery bottle. See the
“Specifications” section.
• Add recommended coolant mixture as necessary.
• Periodically remove radiator pressure cap to make
sure the coolant recovery system is functioning
properly. Coolant should be at bottom of radiator
filler neck. If coolant level is low, inspect gasket in
radiator pressure cap. Replace cap, if necessary.
To have pressure cap tested, contact an Authorized
Service Dealer. Inspect cooling system and coolant
recovery system for leaks.
MAINTENANCE OWNER/
OPERATOR CAN PERFORM
CHECK ENGINE OIL LEVEL
Refer to the “Checking Fluid Levels” section.
CHECK BATTERY
• Check battery fluid level each week as outlined
under “Check Fluid Levels”.
• Check battery cables for condition, tightness, cor-
rosion or damage. Clean, tighten or replace as
necessary.
EXERCISE SYSTEM
Start the generator engine at least once every seven
days and let it run at least 20 minutes. See the
“Weekly Exercise Cycle” section.
INSPECT COOLING SYSTEM
• Inspect engine cooling system at least once each
month.
• Check hoses for damage, deterioration, leaks, etc.
Correct any discrepancies found.
• Check hose clamps for tightness.
CHECK ENGINE COOLANT LEVEL
See the “Checking Fluid Levels” section.
PERFORM VISUAL INSPECTION
Complete a thorough visual inspection of the entire
engine-generator monthly. Look for obvious damage,
loose, missing or corroded nuts, bolts and other fasteners. Look for fuel, oil or coolant leaks.
CHECK FAN BELT
• Inspect fan belts every three months. Replace any
damaged, deteriorated, worn or otherwise defective belt.
• Check fan belt tension. Thumb pressure, exerted
midway between pulleys, should deflect about 3/8
to 5/8 inch. Adjust belt tension as required.
INSPECT ENGINE GOVERNOR
Visually inspect electronic governor.
DANGER
Do not attempt to adjust the governor. Only
qualified service facilities should adjust the governor. Excessively high operating speeds are dangerous and increase the risk of personal injury.
Low speeds impose a heavy load on the engine
when adequate engine power is not available
and may shorten engine life. Correct rated frequency and voltage are supplied only at the
proper governed speed. Some connected electrical load devices may be damaged by incorrect
frequency and/or voltage. Only qualified service
technicians should adjust the governed speed.
CHANGING ENGINE OIL
Refer to maintenance performed by authorized service facilities for engine oil and filter change frequencies.
Drain the oil while the engine is still warm from running. This means warm up the engine, shut it down
and drain immediately as follows:
1. Remove OIL DRAIN HOSE from its retaining
clip.
2. Loosen and remove OIL DRAIN HOSE CAP. Drain
oil completely into suitable container.
3. When all oil has drained, install and tighten OIL
DRAIN HOSE CAP, and re-install into its retaining
clip.
4. Turn OIL FILTER (Figure 10.2) counterclockwise
and remove. Dispose of old filter.
5. Apply light coating of new engine oil to seal of new
oil filter.-Install FILTER and tighten by hand only.
DO NOT OVERTIGHTEN.
6. Remove OIL FILL CAP. Add recommended oil (see
SPECIFICATIONS). DO NOT FILL ABOVE THE
DIPSTICK “FULL” MARK. Crankcase oil capacity
is 4.0 U.S. quarts (3.8 liters).
INSPECT EXHAUST SYSTEM
Inspect the exhaust system at least once every three
months. Check all exhaust system pipes, mufflers,
clamps, etc. for condition, tightness, leaks, security,
damage.
Maint004 Rev. 0 08/05
10-2
After refilling the crankcase with oil, always
check oil level on dipstick. NEVER OPERATE
ENGINE WITH OIL BELOW THE DIPSTICK “ADD”
MARK.
k
Standby Generator Sets
Maintenance
7. Start engine and check for oil leaks.
Figure 10.2 - Oil Filter
Oil Fill
Oil
Dipstic
Oil Filter
CHANGING THE ENGINE AIR CLEANER
To replace the engine air cleaner, (part number
0A4637), remove the air cleaner cover and replace
the air filter making sure it is positioned properly
before reattaching the cover.
Figure 10.3 — Engine Air Filter
2. Remove the spark plugs and check the condition.
Replace the spark plugs if worn or if reuse is
questionable. See the “Service Schedule” section
for recommended inspection.
3. Check the spark plug gap using a wire feeler
gauge. Adjust the gap to 1.14 mm (0.045 inch)
by carefully bending the ground electrode (Figure
10.4).
Figure 10.4 – Setting the Spark Plug Gap
SET PLUG GAP AT 1.14 mm
(0.045 inch)
COOLANT CHANGE
Every year, have an Authorized Service Facility
drain, flush and refill the cooling system. See the
“Specifications” section for cooling system recommendations.
Air Filter
See the “Service Schedule” section for air cleaner
maintenance.
SPARK PLUGS
Reset the spark plug gap or replace the spark plugs
as necessary.
1. Clean the area around the base of the spark plugs
to keep dirt and debris out of the engine. Clean
by scraping or washing using a wire brush and
commercial solvent. Do not blast the spark plugs
to clean.
10-3
MISCELLANEOUS MAINTENANCE
CLEANING THE GENERATOR
Keep the generator as clean and as dry as possible.
Dirt and moisture that accumulates on internal generator windings have an adverse effect on insulation
resistance.
Periodically clean generator exterior surfaces. A soft
brush may be used to loosen caked on dirt. Use a
vacuum system or dry, low pressure air to remove
any accumulations of dirt. The generator is housed
inside an all-weather enclosure, clean the enclosure
with a soft, damp cloth or sponge and water.
Once each year, have the generator cleaned and
inspected by an Authorized Service Dealer. That
dealer will use dry, low pressure air to clean internal
windings. Parts inside the control console should be
cleaned and inspected at this time as well.
Finally, have the insulation resistance of stator and
rotor windings checked. If insulation resistances are
excessively low, the generator may require drying.
Maint004 Rev. 0 08/05
Standby Generator Sets
Maintenance
BATTERY
All lead-acid storage batteries discharge when not in
use. Refer to specific instructions and warnings that
accompany the battery. If such information is not
available, observe the following precautions when
handling a battery:
• DO NOT use jumper cables and a booster battery
to crank or start the generator engine.
• DO NOT recharge a weak battery while it is
installed in the generator. Remove battery from
generator and recharge in a well-ventilated area,
away from fuel vapors, sparks, heat or flames.
• Battery electrolyte fluid is an extremely caustic
sulfuric solution that can cause severe burns. DO
NOT permit fluid to contact eyes, skin, clothing,
painted surfaces, wiring insulation, etc. If any battery fluid is spilled, flush the affected area with
clear water immediately.
• Always wear safety glasses, rubber apron and
gloves when handling a battery.
• Batteries give off explosive hydrogen gas while
charging. The gas can form an explosive mixture
around the battery for several hours after charging.
Any spark, heat or flames can ignite the gas and
cause an explosion which can shatter the battery,
causing blindness or other serious injury.
BATTERY MAINTENANCE
The battery should be inspected per the “Service
Schedule” section. The following procedure should
be followed for inspection:
1. Inspect the battery posts and cables for tightness
and corrosion. Tighten and clean as necessary.
2. Check the battery fluid level of unsealed batteries
and, if necessary, fill with DISTILLED WATER
ONLY. DO NOT USE TAP WATER IN BATTERIES.
3. Have the state of charge and condition checked.
This should be done with an automotive-type battery hydrometer.
DANGER
Storage batteries give off explosive hydrogen
gas. This gas can form an explosive mixture
around the battery for several hours after charging. The slightest spark can ignite the gas and
cause an explosion. Such an explosion can shatter the battery and cause blindness or other
injury. Any area that houses a storage battery
must be properly ventilated. Do not allow smoking, open flame, sparks or any spark producing
tools or equipment near the battery.
Battery electrolyte fluid is an extremely caus-
tic sulfuric acid solution that can cause severe
burns. Do not permit fluid to contact eyes, skin,
clothing, painted surfaces, etc. Wear protective
goggles, protective clothing and gloves when
handling a battery. If the fluid is spilled, flush
the affected area immediately with clear water.
Do not use any jumper cables or booster battery
to crank and start the generator engine. If the
battery has completely discharged, remove it
from the generator for recharging.
Be sure the AUTO/OFF/MANUAL switch is set to
the OFF position before connecting the battery
cables. If the switch is set to AUTO or MANUAL,
the generator can crank and start as soon as the
battery cables are connected.
Be sure the 120VAC power supply to the battery
is turned OFF, or sparking may occur at the battery posts as the cables are attached and cause
an explosion.
BATTERY REPLACEMENT
When replacing batteries, use the same number and
the type of battery that follows:
BCI Group No. CCA
24F-6 525 @ 0 deg. F
NOTE:
The BCI number should be located directly on the
battery.
REPAIR PARTS
The latter portion of this manual consists of exploded
views, parts lists and electrical data pertaining to this
generator set. The parts lists consist of (a) an item
number, (b) a part number, (c) the quantity required,
and (d) a description of the part. The item number
corresponds to an identical number on the exploded
view drawing.
Maint004 Rev. 0 08/05
10-4
Standby Generator Sets
Service Schedule
SERVICE SCHEDULE
30 KW - 150 KW STANDBY GAS ENGINE DRIVEN GENERATOR SETS
The following is a recommended maintenance schedule for standby gas engine driven generator sets from 30kW to
150 kW in size. The established intervals in the schedule are the maximum recommended when the unit is used
in an average service application. They will need to be decreased (performed more frequently) if the unit is used
in a severe application. Use calendar time, from the previous maintenance interval to determine the next required
maintenance interval.
Service Maintenance Interval Information:
The various service maintenance intervals are designated by interval numbers as follows:
1 An early inspection of the generator set to insure it is ready to operate when required and to identify any poten-
tial problem areas.
This inspection may be performed by the end user providing the following safety steps are taken to prevent
the engine from starting automatically without warning:
To prevent injury, perform the following steps in the order indicated before starting any maintenance:
• Disable the generator set from starting and/or connecting to the load by setting the control panel Auto/Off/
Manual switch to the “OFF” position.
• Remove the 15 amp control panel fuse.
• Turn off the battery charger.
• Remove the negative battery cable.
The battery charger must be turned off BEFORE removing the battery cable to prevent an over current condition
from burning out sensitive control panel components and circuits.
Following all maintenance, reverse these steps to insure the unit is returned to standby setup for normal
operation when required.
2 A wear-in service inspection of the generator set to insure it is ready to operate and carry the load when
required, and to identify any potential problem areas.
Performed ONLY ONCE following the first three months or the first 30 hours of operation after purchase of
the unit.
This inspection contains some maintenance tasks which require special tools, equipment, and/or knowledge
to accomplish and should be performed only by an Authorized Service Dealer.
3 An operational inspection of the generator set to insure it is ready to operate and carry the load when required,
and to identify any potential problem areas.
Performed semi-annually or following each 50 hours of operation of the unit.
This inspection contains some maintenance tasks which require special tools, equipment, and/or knowledge
to accomplish and should be performed only by an Authorized Service Dealer.
4 A mid-level inspection of the generator set to insure it is ready to operate and carry the load when required,
and to identify any potential problem areas.
Performed annually or following each 100 hours of operation of the unit.
This inspection contains some maintenance tasks which require special tools, equipment, and/or knowledge
to accomplish and should be performed only by an Authorized Service Dealer.
5 A comprehensive inspection of the generator set to insure it is properly serviced and ready to operate and carry
the load when required, and to identify any potential problem areas.
Performed annually or following each 250 hours of operation of the unit.
This inspection contains some maintenance tasks which require special tools, equipment, and/or knowledge
to accomplish and should be performed only by an Authorized Service Dealer.
11-1
SrvSchd001 Rev. A 09/05
Standby Generator Sets
Service Schedule
Maintenance Level 1 Level 2 Level 3 Level 4 Level5
Tasks Recom- Task Required Task Required Task Task Required Task
mended Comp. to be done Comp. to be done Comp. Required Comp. to be done Comp.
to be done (Date- 3 months/ (Date- Semi- (Date- to be done (Date- Bi- (Date monthly/ Initials) Break-in Initials) annually/ Initials) Annually/ Initials) annually/ Initials)
10 hrs. 30 hrs. 50 hrs. 100 hrs. 250 hrs.
1. Disable the unit
from operating
per the first page
warning.
2. Check the engine
oil level. Adjust
as necessary.
3. Check the engine
coolant level.
Adjust as
necessary.
4. Check the engine
coolant thermal
protection level.
Correct as
necessary.
5. Check the natural
gas delivery
system for leaks
and correct
pressure on gas
engine driven
units. Tighten
connections as
necessary.
6. Check the air
inlets and outlets
for debris. Clean
as necessary.
7. Check the battery
electrolyte level
and specific
gravity if
accessible. Adjust
as necessary.
8. Check the battery
posts, cables,
and charger for
loose
connections,
corrosion, and
proper operation.
Correct as
necessary.
9. Check the unit
wiring for loose
connections,
corrosion, and
damage. Correct
as necessary.
SrvSchd001 Rev. A 09/05
11-2
Standby Generator Sets
Service Schedule
Maintenance Level 1 Level 2 Level 3 Level 4 Level5
Tasks Recom- Task Required Task Required Task Task Required Task
mended Comp. to be done Comp. to be done Comp. Required Comp. to be done Comp.
to be done (Date- 3 months/ (Date- Semi- (Date- to be done (Date- Bi- (Date monthly/ Initials) Break-in Initials) annually/ Initials) Annually/ Initials) annually/ Initials)
10 hrs. 30 hrs. 50 hrs. 100 hrs. 250 hrs.
10. Check the engine
accessory drive
belts and fan
coupling device
if equipped for
correct tension,
wear, weather
cracking, and
damage. Replace
as necessary.
11. Check the engine
valve clearance.
Adjust as
necessary.
12. Visually inspect
the unit looking
for leaks, wear or
damage, loose
connections or
components, and
corrosion. Correct
as necessary.
13. Test the engine
and transfer
switch safety
devices. Correct
and/or adjust as
necessary.
14. Initiate an
automatic start
and transfer of
the unit to site
load and exercise
it for at least 1
hour looking for
leaks, loose
connections or
components, and
abnormal
operating
conditions.
Correct as
necessary.
15. Replace the
engine
accessory
drive belts.
16. Check gearbox
oil level (if
equipped).
17. Change gearbox
oil (if equipped).
11-3
SrvSchd001 Rev. A 09/05
Standby Generator Sets
Service Schedule
Maintenance Level 1 Level 2 Level 3 Level 4 Level5
Tasks Recom- Task Required Task Required Task Task Required Task
mended Comp. to be done Comp. to be done Comp. Required Comp. to be done Comp.
to be done (Date- 3 months/ (Date- Semi- (Date- to be done (Date- Bi- (Date monthly/ Initials) Break-in Initials) annually/ Initials) Annually/ Initials) annually/ Initials)
10 hrs. 30 hrs. 50 hrs. 100 hrs. 250 hrs.
18. Start and
exercise the unit
at full rated load
(use a load bank
if the site load is
not enough) for
at least 2 hours
looking for leaks,
loose
connections or
components, and
abnormal
operating
conditions.
Correct as
necessary.
19. Perform an
engine oil
analysis (send a
sample to a lab
for results).
Change the
engine oil and
filters if the
analysis results
indicate this is
required.
20. Change the
engine oil.
21. Replace the
engine oil filter(s).
22. Replace engine
spark plugs.
Clean and re-gap
or replace as
necessary.
23. Replace the
engine air
filter(s).
24. Perform a 5
minute no-load
operational run
of the unit
looking for any
post service
problems.
25. Return the unit
to standby setup
for operation
when required.
SrvSchd001 Rev. A 09/05
11-4
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