Generac Power Systems 8 kW LP User manual

Owner’s Manual
Automatic Standby Generator
Reference all appropriate documentation.
This manual should remain with the unit.
nNOT INTENDED FOR USE IN CRITICAL LIFE SUPPORT APPLICATIONS.
nONLY QUALIFIED ELECTRICIANS OR CONTRACTORS SHOULD ATTEMPT
INSTALLATION.
nDEADLY EXHAUST FUMES! OUTDOOR INSTALLATION ONLY!
LISTED
CUS
Home Standby Models:
8kW to 20kW

i
WARNING!
California Proposition 65
Engine exhaust and some of its constituents are known to the state of California to cause cancer,
birth defects, and other reproductive harm.
WARNING!
California Proposition 65
This product contains or emits chemicals known to the state of California to cause cancer,
birth defects, and other reproductive harm.
Use this page to record important information about your generator set.
Record the information found on your unit data label on this page. For the
location of the unit data label, see Section 2 General Information. The
unit has a label plate affixed to the inside partition, to the left of the control
panel console as shown in Figures 2-1, 2-2, and 2-3. For directions on
how to open the top lid and remove the front panel, see Section 3 Opera-
tion. The Unit Identification label provides the following information:
• Model Number
• Serial Number
• Control Panel Part Number
• Voltage Rating of the unit
• Maximum Current Rating of the unit (AMPS)
When contacting an Authorized Service Dealer about parts and service,
always supply the complete model number and serial number of the unit.
Operation and Maintenance: Proper maintenance and care of the gen-
erator ensures a minimum number of problems and keeps operating
expenses at a minimum. 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 replace-
ment 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 may contribute to
the need for additional maintenance or service.
When the generator requires servicing or repairs, contact an Authorized
Service Dealer for assistance. Authorized service technicians are factory-
trained and are capable of handling all service needs.
To find your Local AUTHORIZED SERVICE DEALER
AUTHORIZED SERVICE
DEALER LOCATION
To locate the nearest AUTHORIZED
SERVICE DEALER, please call this
number:
1-800-333-1322
or, visit the dealer locator at:
www.generac.com/Service/DealerLocator/

Table of Contents
ii
Section 1 — Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 — General Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 — General Safety Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 — Exhaust Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 — Electrical Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.5 — Fire Hazards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.6 — Explosion Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Section 2 — General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 — The Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 — Protection Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 — Emission Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 — Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 — Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Section 3 — Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 — Control Panel Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 — Using the Auto/Off/Manual Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 — Interface Menu Displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4 — Automatic Transfer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.5 — Turning the Generator Off When Operating Under Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.6 — Manual Transfer Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.7 — Side Compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.8 — Alarm Response Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.9 — Battery Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.10 — Setting the Exercise Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Section 4 — Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 — Performing Scheduled Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 — Service Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3 — Checking Engine Oil Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4 — Changing the Engine Air Cleaner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.5 — Spark Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.6 — Valve Lash Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.7 — Battery Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.8 — Attention After Submersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.9 — Corrosion Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.10 — Out of Service Procedure (includes removal and return from service). . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Section 5 — Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Section 6 — Quick Reference Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Also included is Spanish, French Canadian and Portuguese.

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Automatic Standby Generator Owner’s Manual 1
Section 1 Safety
INTRODUCTION: Thank you for purchasing this compact, high performance, air-cooled, engine-driven stationary automatic standby generator
set. Every effort was made to make sure that the information and instructions in this manual were both accurate and current at the time the man-
ual was written. However, the manufacturer reserves the right to change, alter or otherwise improve this product or manual at any time without
prior notice.
This generator is 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 and is intended exclusively for outdoor installation. This generator will operate using either vapor
withdrawn liquid propane (LP) or natural gas (NG).
NOTE: When properly sized, this generator is suitable for supplying typical residential loads such as Induction Motors (sump pumps,
refrigerators, air conditioners, furnaces, etc.), Electronic Components (computer, monitor, TV, etc.), Lighting Loads and Microwaves.
READ THIS MANUAL THOROUGHLY: The operator is responsible for proper and safe use of this equipment. The manufacturer strongly recom-
mends that the operator read and thoroughly understand the instructions and contents of this owner’s manual before attempting to use the equip-
ment. If any portion of this publication is not understood, contact the nearest Authorized Service Dealer for starting, operating and servicing
procedures.
SAVE THESE INSTRUCTIONS: The manufacturer suggests that this manual and the 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.
SAFETY: Throughout this manual, and on tags and decals affixed to the unit, DANGER, WARNING, CAUTION and NOTE blocks are used to
alert personnel to special instructions about a particular operation, function or service that may be hazardous if performed incorrectly or care-
lessly. Observe them carefully. Their definitions are as follows:
INDICATES A HAZARDOUS SITUATION OR ACTION WHICH, IF NOT AVOIDED, WILL RESULT IN DEATH OR SERIOUS
INJURY.
Indicates a hazardous situation or action which, if not avoided, could result in death or serious injury.
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
NOTE: Notes contain additional information important to an operation or procedure.
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 Information that, if not followed, could endanger personal safety and/or
property of others.
This symbol points out a potential Explosion Hazard.
This symbol points out a potential Fire Hazard.
This symbol points out a potential Electrical Shock Hazard.
These “Safety Alerts” cannot eliminate the hazards that they signal. Strict compliance with these special instructions, plus common sense are
major accident prevention measures.
**
$
!
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2Automatic Standby Generator Owner’s Manual
1.1 — General Safety
Study these safety rules carefully before 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 using a procedure, work method or operating technique the manufacturer does not
specifically recommend, ensure that it is safe for personnel. Also make sure the procedure, work method or operating technique utilized does not
render the generator unsafe.
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
and maintain this equipment.
Potentially lethal voltages are generated by these machines. Ensure steps are taken to make the machine safe
before attempting to work on the generator.
Parts of the generator are rotating and/or hot during operation. Exercise care near a running generator.
The installation of this generator must always comply with applicable codes, standards, laws and regulations.
A running generator gives off DEADLY carbon monoxide, an odorless, colorless, poisonous gas. Breathing carbon
monoxide can cause dizziness, throbbing temples, nausea, muscular twitching, headache, vomiting, weakness,
sleepiness, inability to think clearly, fainting, unconsciousness or even death.
The control panel for this unit is intended to be operated by qualified service personnel only.
1.2 — General Safety Hazards
• For safety reasons, this equipment should only be installed, serviced and repaired by a Service Dealer or other competent, qualified electri-
cian or installation technician who is familiar with applicable codes, standards, regulations and product Installation Manual guidelines. The
operator also must comply with all such codes, standards, regulations and product Installation Manual guidelines.
• The engine exhaust fumes contain carbon monoxide, which can be DEADLY. This dangerous gas, if breathed in sufficient concentrations, can
cause unconsciousness or even death. DO NOT alter or add to the exhaust system or do anything that might render the system unsafe or in
noncompliance with applicable codes and standards.
• Install a carbon monoxide alarm indoors, according to manufacturer’s instructions/recommendations.
• Adequate, unobstructed flow of cooling and ventilating air is critical for 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. The generator MUST be installed and
operated outdoors only.
• 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.
• 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 Dealer for parts needing repair or replacement.
• Before performing any maintenance on the generator, remove the control panel fuse and disconnect the Negative (—) battery cable to pre-
vent accidental startup. When disconnecting battery cables always remove the NEGATIVE (NEG or “—”) cable first, then remove the
POSITVE (POS, or “+”) cable. When reconnecting the cables, connect the POSITIVE cable first, and the NEGATIVE 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.
*
+
*
*
*
*

Automatic Standby Generator Owner’s Manual 3
1.3 — Exhaust Hazards
• Generator engine exhaust contains DEADLY carbon monoxide, an odorless, colorless, poisonous gas. Breathing carbon monoxide can
cause dizziness, throbbing temples, nausea, muscular twitching, headache, vomiting, weakness, sleepiness, inability to think clearly, fainting,
unconsciousness or even death. If any carbon monoxide poisoning symptom is experienced, move into fresh air and immediately seek med-
ical attention.
• This generator is designed for OUTDOOR installation ONLY. Never operate the generator inside any garage or other enclosed space.
1.4 — Electrical Hazards
• All generators covered by this manual produce dangerous electrical voltages that 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 operation. Avoid contact with bare
wires, terminals, connections, etc. while the unit is running. Ensure all appropriate covers, guards and barriers are in place, secured and/or
locked before operating the generator. If work must be done around an operating unit, stand on an insulated, dry surface to reduce potential
shock hazard.
• Do not handle any kind of electrical device while standing in water, while barefoot, or while hands or feet are wet. DANGEROUS ELECTRI-
CAL SHOCK MAY RESULT.
• This is an Automatic Standby Generator, the generator may crank and start at any time when utility is lost. When this occurs, load circuits are
transferred to the STANDBY (generator) power source. To prevent injury, before working on this generator (for inspection, service or mainte-
nance), always put the generator into the OFF mode and remove the 7.5 Amp fuse from the generator control panel.
• 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 resulting in injury.
1.5 — Fire Hazards
• For fire safety, the generator must be installed and maintained properly. Installation MUST always comply with applicable codes, standards,
laws, regulations and product Installation Manual guidelines. 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 installation, do nothing that might alter a safe instal-
lation and render the unit in noncompliance with the aforementioned codes, standards, laws and regulations.
• 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 generator. Keep the extinguisher properly charged and be familiar with its use. Consult the local fire department with
any questions pertaining to fire extinguishers.
1.6 — Explosion Hazards
• 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.
• Gaseous fluids such as natural gas and liquid propane (LP) gas are extremely EXPLOSIVE. Install the fuel supply system according to appli-
cable 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 can be permitted.

4Automatic Standby Generator Owner’s Manual
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 transfer switch. The transfer switch must effectively isolate the electrical system
from the utility distribution system when the generator is operating (NEC 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.
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Automatic Standby Generator Owner’s Manual 5
Section 2 General Information
2.1 — The Generator
Figure 2-1: GH-410 Engine 8kW Unit
Figure 2-2: GH-530 Engine 11kW Unit
EXHAUST
E
NCLOSURE
COMPOSITE BASE
OIL FILTER
OIL FILL CAP BATTERY COMPARTMEN
T
FUEL
REGULATOR
CIRCUIT
BREAKERS
FUEL INLET
(BACK)
CONTROL
PANEL
OIL
DIPSTICK
AIR FILTER
DATA LABEL
(SEE SAMPLE)
EXHAUST
ENCLOSURE
COMPOSITE BASE OIL FILTER OIL FILL CAP
BATTERY COMPARTMENT
FUEL
REGULATOR
CIRCUIT
BREAKERS
FUEL
INLET
(BACK)
CONTROL
PANEL
OIL
DIPSTICK AIR FILTER
DATA LABEL
(SEE SAMPLE)
EXHAUST
ENCLOSURE
COMPOSITE BASE OIL FILTER OIL FILL CAP
BATTERY COMPARTMENT
FUEL
REGULATOR
CIRCUIT
BREAKERS
FUEL
INLET
(BACK)
CONTROL
PANEL
OIL
DIPSTICK AIR FILTER
DATA LABEL
(SEE SAMPLE)

6Automatic Standby Generator Owner’s Manual
Figure 2-3: GT-990/GT-999 Engines, 13-20kW Unit
2.2 — Protection Systems
The generator may have to run for long periods of time with no operator present to monitor the engine/generator conditions. Therefore, the gen-
erator is equipped with a number of systems to automatically shut down the unit to protect it against potentially damaging conditions. Some of
these systems are as follows:
The control panel contains a display which alerts the operator when a fault condition occurs. The above list is not all inclusive. For more informa-
tion about alarms and control panel operation, see Section 3 Operation.
• Low Oil Pressure Sensor
• High Temperature Sensor
• Overcrank Sensor
• Overspeed Sensor
• RPM Sensor
• Under-frequency Sensor
• Undervoltage Sensor
• Overvoltage Sensor
• Internal Failure Sensor
• Low Battery Voltage Alarm
EXHAUST
ENCLOSURE
COMPOSITE BASE OIL FILTER OIL FILL CAP
BATTERY COMPARTMENT
FUEL
REGULATOR
CIRCUIT
BREAKERS
FUEL
INLET
(BACK)
CONTROL
PANEL
OIL
DIPSTICK AIR FILTER
DATA LABEL
(SEE SAMPLE)

Automatic Standby Generator Owner’s Manual 7
2.3 — Emission Information
The U.S. Environmental Protection Agency (EPA) requires that this generator comply with exhaust emission standards. This generator is certified
to meet the applicable EPA emission levels, and is certified for use as a stationary engine for standby power generation. Any other use may be a
violation of federal and/or local laws. To ensure that the engine complies with the applicable emission standards for the duration of the engine’s
life, it is important to follow the maintenance specifications in the Section 4 Maintenance. This generator is certified to operate on Liquid Propane
Vapor fuel or pipeline Natural Gas.
For generators 13kW and greater, the Emission Control System code is EM (Engine Modification). The Emission Control System on this
generator consists of the following components:
• Air Induction System
• Intake Pipe / Manifold
• Air Cleaner
• Fuel Metering System
• Carburetor / Mixer Assembly
• Fuel Regulator
• Ignition System
• Spark Plug
• Ignition Module
• Exhaust System
• Exhaust Manifold
• Muffler
• Catalyst (11kW generator only)

8Automatic Standby Generator Owner’s Manual
2.4 — Specifications
2.4.1 — Generator
2.4.2 — Engine
The specification sheet for your generator was included in the documentation provided with the unit at the time of purchase. For additional
copies, consult your local Authorized Service Dealer for your specific generator model.
Model 8kW 11kW 13kW 14kW 15kW 16kW 17kW 20kW
Rated Voltage 240
Rated Maximum Load
Current (Amps) at 240
Volts (LP)*
33.3 45.8 54.2 58.3 62.5 66.6 70.8 83.3
Main Circuit Breaker 35 Amp 50 Amp 55 Amp 60 Amp 60 Amp 65 Amp 65 Amp 90 Amp
Phase 1
Rated AC Frequency 60 Hz
Battery Requirement Group 26R, 12 Volts and 525 CCA Minimum (Generac Part No. 0H3421S)
Weight (unit only in
lbs./kilos)
360/163.3 407/184.6 435/197.3 435/197.3 471/213.6 471/213.6 Steel -
471/213.6
Aluminum -
437/198.2
451/204.6
Enclosure Steel Steel Steel Steel Steel Steel Steel/
Aluminum Aluminum
Normal Operating
Range
This unit is tested in accordance to UL 2200 standards with an operating temperature of -20º F (-29º C) to 122º F (50º C). For areas where tem-
peratures fall below 32º F (0º C) a cold weather kit is highly recommended. When operated above 77º F (25º C) there may be a decrease in engine
power. Please reference the engine specifications section.
These generators are rated in accordance with UL 2200, Safety Standard for Stationary Engine Generator Assemblies, and CSA-C22.2 No. 100-04
Standard for Motors and Generators.
* Natural Gas ratings will depend on specific fuel Btu/joules content. Typical derates are between 10-20% off the LP gas rating.
** Circuits to be moved must be protected by same size breaker. For example, a 15 amp circuit in the main panel must be a 15 amp circuit in the transfer switch.
Model 8kW 11kW 13/14/15/16/17kW 20kW
Type of Engine GH-410 GT-530 GT-990 GT-999
Number of Cylinders 1 2 2 2
Displacement 410cc 530cc 992cc 999cc
Cylinder Block Aluminum w/Cast Iron Sleeve
Recommended Spark Plug RC14YC BPR6HS RC14YC RC12YC
Spark Plug Gap 0.76mm (0.030”) 0.76mm (0.030”) 1.02mm (0.040”) 0.76mm (0.030”)
Starter 12 VDC
Oil Capacity Including Filter Approx. 1.5 Qts./1.4L Approx. 1.7 Qts./1.6L Approx. 1.9 Qts/1.8L Approx. 1.9 Qts/1.8L
Recommended Oil Filter Part #070185F
Recommended Air Filter Part #0E9371A Part #0E9371A Part #0J8478 Part #0J8478
Engine power is subject to and limited by such factors as fuel Btu/joules content, ambient temperature and altitude. Engine power decreases about 3.5
percent for each 1,000 feet (304.8 meters) above sea level, and also will decrease about 1 percent for each 6º C (10º F) above 15º C (60º F) ambient tem-
perature.

Automatic Standby Generator Owner’s Manual 9
2.4.3 — Fuel Requirements
The engine has been fitted with a dual fuel carburetion system. The unit will run on natural gas or LP gas (vapor), but it has been factory set to
run on natural gas. The fuel system will be configured for the available fuel source during installation.
Recommended fuels should have a btu content of at least 1,000 Btus per cubic foot (37.26 megjoules per cubic meter) for natural gas, or at least
2,500 Btus per cubic foot (93.15 megajoules per cubic meter) for LP gas (vapor).
NOTE: If converting to LP gas from natural gas, a minimum LP tank size of 250 gallons (946 liters) is recommended. See the Installa-
tion Manual for complete procedures and details.
Gaseous fuels such as natural gas and liquid propane gas are highly explosive. Even the
slightest spark can ignite such fuels and cause an explosion. No leakage of fuel is permitted.
Natural gas, which is lighter than air, tends to collect in high areas. LP gas is heavier than air
and tends to settle in low areas
2.4.4 — Battery Requirements
Group 26R, 12V, minimum 525CCA (Generac Part No. 0H3421S).
For proper battery maintenance procedures, see Section 4 Maintenance.
2.4.5 — Battery Charger
The battery charger is integrated into the control panel module in all models. It operates as a “Smart Charger” which ensures output charging lev-
els are safe and continuously optimized to promote maximum battery life.
2.4.6 — Engine Oil Requirements
For proper oil viscosity, see chart in Figure 4-1: Recommended Oil Based on Temperature.
2.5 — Accessories
There are performance enhancing accessories available for air-cooled generators.
Contact a Dealer for additional information on accessories.
Accessory Description
Cold Weather Kit Recommended in areas where temperatures regularly fall below 32º F (0º C).
Scheduled Maintenance Kit Includes all pieces necessary to perform maintenance on the generator along with oil recommendations.
Auxiliary Transfer Switch Lock-
out
Enables any of the transfer switches to completely lock out one large electrical load by tying into its control system.
Fascia Skirt Wrap Standard on all 20kW units. It is available for all other current production air-cooled units. It snaps together to pro-
vide a smoothing, contoured look as well as rodent/insect protection.
Mobile Link™ Provides a personalized web portal that displays the generator’s status, maintenance schedule, event history and
much more. This portal is accessible via computer, tablet or smart phone. Sends emails and/or text notifications the
moment there is any change in the generator’s status. Notification settings can be customized to what type of alert is
sent and how often. For more information, visit www.standbystatus.com.
Touch-Up Paint Kit Very important to maintain the look and integrity of the generator enclosure. This kit includes touch-up paint and
instructions.
$

10 Automatic Standby Generator Owner’s Manual
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Section 3 Operation
Automatic Standby Generator Owner’s Manual 11
3.1 — Control Panel Interface
The control panel on this unit is intended to only be operated by qualified service personnel.
The Control panel interface is located under the lid of the enclosure. Before attempting to lift the lid of the enclosure, verify that both left and right
side locks are unlocked. To remove the front cover, lift the cover straight up to disengage the side hooks, then tilt and lift it away from the unit.
When closing the unit, ensure that both left and right side locks are securely locked. See Figure 3-1.
.
The enclosed keys provided with this unit are for service personnel usage only.
Figure 3-1: Generator With Lid Open/Side Lock Location
Set to AUTO, the engine may crank and start at any time without warning. Such automatic starting
occurs
when utility power source voltage drops below a preset level or during the normal exercise
cycle. To prevent possible injury that might be caused by such sudden starts, always set to OFF and
remove the fuses before work ing on or around the generator or transfer switch. Then, place a “DO
NOT
OPERA TE” tag on the generator panel and on the trans fer switch.
NOTE: The generator is to be run with all appropriate panels in place, including during troubleshooting by a technician.
*
*
SIDE LOCK
*

12 Automatic Standby Generator Owner’s Manual
Figure 3-2: Generator Control Panel
3.2 — Using the Auto/Off/Manual Buttons
NOTE: Damage caused by mis-wiring of the interconnect wires is not warrantable.
3.3 — Interface Menu Displays
The LCD display:
3.3.1— Menu System Navigation
To get to the MENU, use the “Escape” button from any page. It may require pressing it many times before getting to the MENU page. Navigate to
the desired menu by using the ↑/↓buttons. When the desired menu is displayed and flashing, press the “Enter” button. See Figure 3-3.
Button Description of Operation
Auto Selecting this button activates fully auto matic system operation. It also allows the unit to automati cally star t and exercise the
engine every seven days with the
setting of the exercise timer (see the Setting the Exercise Timer section).
Off This button shuts down the engine and also prevents automatic operation of the unit.
Manual This button will crank and start the generator. Transfer to standby power will not occur unless there is a utility
failure.
Feature Description
HOME page The default page which will be displayed if no buttons are pressed for 60 seconds. This page normally shows the current Status
message and the current date and time. The highest priority active Alarm/Warning will be automatically posted on this page as
well as flashing the backlight when such a condition is detected. In the case of multiple Alarms/Warnings, only the first message
will be displayed. To clear an Alarm or Warning, press the OFF button and then press the ENTER key.
Display Backlight Normally off. If the operator presses any button, the backlight will automatically light and remain on for 30 seconds.
MAIN MENU page Allows the operator to navigate to all other pages or sub-menus by using the Arrows and Enter buttons. This page can be
accessed at any time with several presses of the dedicated Escape button. Each press of the Escape button takes the operator
to the previous menu until the MAIN MENU displays. This page contains information for - History; Status; Edit; Debug.

Automatic Standby Generator Owner’s Manual 13
Figure 3-3: Navigation Menu
2013 EVOLUTION/SYNC2.0 HSB MENU MAP
0198170GST-D 05/22/13 Page 1 of 4
UP ARROW = + DOWN ARROW = -
“Run Log”
ESC ENTER ENTER
ESC
SYSTEM
BATTERY
DATE/TIME
SUB MENUS
HISTORY EDIT
MAINT
DEALER
EXAMPLE:
Inspect Battery 200 RnHr or 12/27/13
and
Next Maintenance 200 RnHr or 12/27/13
Exercise Time
Å
14:00 Wednesday
Æ
Firmware Update
Å
Press Enter
Æ
Current Date/Time
02/14/13 07:40
ESC
ESC
ESC
ENTER
ENTER
Current Date/Time
Å
2/12/13 12:22
Æ
ESC ENTER
ESC
ESC ESC ESC
ENTER
ENTER
ESC ESC ESC ESC
ENTER
ENTER
ENTERENTER
ESC
ESC
ESC ENTER
MAINT:
Maint. Log
Run Hrs
Scheduled
ENTER
ESC ENTER
Select Day
- Wednesday +
ENTER
ENTER
ENTERENTER
ENTER ENTER
Select Month (1-12)
- 2 +
Run Hours (H)
0.0
ENTER
Select Date (1-31)
- 13 +
ENTER
Select Year (0-99)
- 13 +
ENTER
ENTER
ENTER
ENTER
ESC
Switched to “OFF”
Hours of Protection
0 (H)
Access Requires Password
Language
Å
English
Æ
Fuel Selection
Å
NG or LP
Æ
Possible Message(s)
Corrupted File
Invalid File
File Not Found
Unsupported Device
"Current:V XXXX "
"USB: V XXXX"
"Are You Sure?"
"- Yes or No +"
ESC
ENTER
Firmware Update
Å
Insert USB
Æ
“Alarm Log”
- Alarm Log +
- Run Log +
- 1 thru 50 + - 1 thru 50 +
ESCENTER
ESCENTER
Select “Yes” then Press “Enter” to continue or Press “ESCAPE” to escape out of updating. During update process the Blue “Manual” light flashes, then the Green “Auto” light flashes. Sequence does this twice. When update is complete the unit returns to Install Wizard menu. When the controller powers up the very first screen displays the version number for a few seconds. When update is complete remove Thumb Drive, then follow the Install Wizard Menu.
- 1 thru 50 +
"Battery Maintained"
"Schedule A Serviced"
"Schedule B Serviced"
"Maintenance Reset"
"Inspect Battery"
"Service Schedule A"
"Service Schedule B"
Warning Message(s)
"Low Battery"
"Exercise Set Error"
"FIRMWARE ERROR-9"
"Fuel Pressure"
"Battery Problem"
"Charger Warning"
"Charger Missing AC"
"Overload Warning"
"Overload Cooldown"
"SEEPROM ABUSE"
"USB Warning"
"Download Failure"
Running Manual
Running-Utility Lost
Running-Remote Start
Running-2 Wire Start
Running - Exercise
Switched Off
Stopped - Auto
Stopped - Alarm
Alarm Message(s)
"High Engine Temp."
"Low Oil Pressure"
"Overcrank"
"Overspeed"
"RPM Sense Loss"
"Underspeed"
"Internal Fault"
"FIRMWARE ERROR-7"
"WIRING ERROR"
"Over Voltage"
"Under Voltage"
"Overload Remove Load"
"Low Volts Remove Load"
"Stepper Over Current"
"Fuse Problem"
ESC
Select Min (0-59)
- 0 +
ESC
ESC
Select Hour (0-23)
- 14 +
ESC
Select Min (0-59)
- 0 +
ESC
Select Hour (0-23)
- 14 +
ESC
Quiet Test Mode ?
- YES or NO +
Quiet Test Mode only
on certain models
Language
+ English -
Fuel Selection
+ NG or LP -
Language
+ Espanol -
Language
+ Francais -
Language
+ Portuguese -
+
-
+
-
+
-
+
Battery Condition
“Good” “Inspect Battery” or “Check Battery”

14 Automatic Standby Generator Owner’s Manual
3.4 — Automatic Transfer Operation
To select automatic operation:
1. Make sure the transfer switch main contacts are set to their UTILITY position (loads connected to the utility power
source).
2. Be sure that normal UTILITY power source voltage is available to transfer switch terminal lugs N1 and N2.
3. Press the AUTO button on the Control Panel Interface.
4. Set the Main Circuit Breaker (Generator Disconnect) to its ON (Closed) position.
With these steps complete, the generator will start automatically when utility source voltage drops below a preset level. After the unit starts, loads
are transferred to the standby power source.
3.4.1— Automatic Sequence of Operation
3.4.1.1 — Utility Failure
With the generator set to AUTO, when the utility fails (below 65% of nominal) a 10 second (optionally programmable) line interrupt delay time is
started. If the utility is still gone when the timer expires, the engine will crank and start. Once started, a 5 second engine warm-up timer will be ini-
tiated. When the warm-up time expires, the controller will transfer the load to the generator. If the utility power is restored (above 75% nominal) at
any time from the initiation of the engine start until the generator is ready to accept load (5 second warm-up time has not elapsed), the controller
will complete the start cycle and run the generator through its normal cool down cycle, however, the load will remain on the utility source.
3.4.1.2 — Cranking
The system will control the cyclic cranking as follows:
• 8kW unit - 5 cranking cycles as follows: 15 second crank, seven (7) second rest, followed by four (4) additional cycles of seven (7) second
cranks followed by seven (7) second rests.
• 11 -20kW units - 5 cranking cycles as follows: 16 second crank, seven (7) second rest, 16 second crank, seven (7) second rest, followed by
three (3) additional cycles of seven (7) second cranks followed by seven (7) second rests.
3.4.1.3 — Load Transfer
The transfer of load when the generator is running is dependent upon the operating mode:
MANUAL • Will not transfer to generator if utility is present.
• Will transfer to generator if utility fails (below 65% of nominal for 10 consecutive seconds).
• Will transfer back when utility returns for 15 consecutive seconds. The engine will continue to run
until removed from the MANUAL mode.
AUTO • Will start and run if utility fails for 10 consecutive seconds (factory default).
• Will start a 5 second engine warm-up timer.
•Will not transfer if utility subsequently returns.
•Will transfer to generator if utility is not present.
• Will transfer back to utility once utility returns (above 75% of nominal) for 15 seconds.
• Will not transfer back to utility unless utility returns. The generator will shut down if the OFF button is
pressed or a shutdown alarm is present.
• Once utility power is returned, the generator will shut down after 1 minute cool-down time.
EXERCISE • Will not exercise if generator is already running in either AUTO or MANUAL mode.
• During exercise, the controller will only transfer if utility fails during exercise for 10 seconds, and will
switch to AUTO.

Automatic Standby Generator Owner’s Manual 15
3.5 — Turning the Generator Off When Operating Under Load
NOTE: Important! To turn the generator off during prolonged utility outages to perform maintenance or conserve
fuel, follow these simple, but important steps:
To turn the generator OFF (while running in AUTO and online):
1. Turn OFF (or OPEN) the main Utility disconnect.
2. Turn OFF (or OPEN) the Main Line Circuit Breaker (MLCB) on the generator.
3. Turn the generator OFF.
To turn the generator back ON:
1. Put the generator back into AUTO and allow to start and warm-up for a few minutes.
2. Turn ON (or CLOSE) the MLCB on the generator.
The system will now be operating in its automatic mode. The main utility disconnect can be turned ON (or CLOSED), but to shut the unit off, this
complete process must be repeated.
3.6 — Manual Transfer Operation
DO NOT attempt to activate the transfer switch manually until all power voltage supplies to the switch have been
completely turned off. Failure to turn off all power voltage supplies may result in extremely hazardous and possi-
bly fatal electrical shock.
Prior to automatic operation, manually exercise the transfer switch to verify that there is no interference with proper operation of the mechanism.
Manual operation of the transfer switch is required if electronic operation should fail.
3.6.1— Transfer to Generator Power Source
1. Press the Control Panel OFF button.
2. Set the Main Circuit Breaker (Generator
Disconnect) to its OFF (OPEN) position.
3. Turn off the utility power supply to the transfer
switch using the means provided (such as a utility
main line circuit breaker).
4. Use the manual transfer handle inside the transfer
switch to move the main contacts to their STANDBY
positions (loads connected to the standby power
source).
5. To crank and start the engine, press the Control
Panel MANUAL button.
6. Allow the engine to stabilize and warm up for a few
minutes.
7. Set the Main Circuit Breaker (Generator
Disconnect) to its ON (CLOSED) position. The
standby power source now powers the loads.
Figure 3-4: Manual Transfer Switch Operation

16 Automatic Standby Generator Owner’s Manual
3.6.2— Transfer Back to Utility Power Source
When utility power has been restored, transfer back to utility source and shut down the generator. To manually transfer back to utility power and
shut down the generator:
1. Set the Main Circuit Breaker (Generator Disconnect) to its OFF (OPEN) position.
2. Allow the engine to run for 2 minutes at no-load to stabilize the internal temperatures.
3. Press the Control Panel OFF button. The engine should shut down.
4. Ensure that utility power supply to the transfer switch is turned off.
5. Use the manual transfer handle inside the transfer switch to move the main contacts back to their UTILITY posi-
tions (loads connected to the utility power source).
6. Turn on the utility power supply to the transfer switch using the means provided.
7. Press the Control Panel AUTO button.
3.7 — Side Compartment
Local codes may require this compartment to be locked. A hasp is provided so the owner/operator can secure the compartment with his or her
own padlock. Check local codes for side compartment locking requirements.
Figure 3-5: Open Side Compartment
3.7.1— Main Circuit Breaker (Generator Disconnect)
This is a 2-pole breaker rated according to relevant specifications.
3.7.2— LED Indicator Lights
• Green LED “Ready” light is on when utility is present and the Control Panel button is in the AUTO position. This also indicates when the gen-
erator is running.
• Red LED “Alarm” light is on when the generator is OFF or a fault is detected and means contact your authorized servicing dealer.
• Yellow LED “Maintenance” light. Note: Yellow LED may be on at the same time as either the Red or Green LEDs.
120V GFCI OUTLET
15 Amp OUTLET BREAKER
MAIN CIRCUIT BREAKER
LED INDICATOR LIGHTS