Generac Power Systems 00940-2, 00941-2, IMPACT-36G plus II, IMPACT-36LPG plus II Owner's Manual And Installation Instructions
POWER SYSTEMS, INC.
®
Owner’s Manual and
Installation Instructions
Air-cooled Recreational Vehicle Generator
• Model Nos: 00940-2 & 00941-2
IMPACT-36 plus II with Inverter
Generac®Power Systems, Inc.
INTRODUCTION
Thank you for purchasing this generator by Generac
Power Systems, Inc. This model is designed and manufactured to supply electrical power for recreational
vehicles.
READ THIS MANUAL THOROUGHLY
If you do not understand any portion of this
manual, contact Generac or your nearest
Generac 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
you to special instructions about a particular operation that may be hazardous if performed incorrectly or carelessly. Observe them carefully. Their definitions are as follows:
After this heading, you can read instructions that,
if not strictly complied with, will result in personal
injury or property damage.
After this heading, you can read instructions that,
if not strictly complied with, may result in personal
injury or property damage.
After this heading, you can read instructions that, if
not strictly complied with, could result in damage to
equipment and/or property.
NOTE:
After this heading, you can 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 for preventing accidents.
Four commonly used safety symbols accompany the
DANGER, WARNING, and CAUTION blocks. Here are
the types of information indicated by each symbol:
This symbol points out important safety information that, if not followed, could endanger personal
safety and/or property to self and others.
This symbol points out potential explosion hazard.
This symbol points out potential fire hazard.
This symbol points out potential electrical shock
hazard.
The operator (i.e., the driver) is responsible for the
proper and safe use of the vehicle and its equipment,
and for the safety of all vehicle occupants. Before
using this equipment, we strongly recommend that
the operator read this manual and thoroughly understand all instructions. We also strongly recommend
instructing other occupants in the vehicle to properly
start and operate the generator. This prepares them to
operate the equipment in case of an emergency.
CONTENTS
This manual contains pertinent owner’s information,
including warranty, electrical diagrams, exploded
views, and lists of repair parts for generator models
00940-2 and 00941-2. In addition, the latter portion
of this manual contains information necessary for the
proper installation of these generators.
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 a
Generac Authorized Service Dealer. Normal maintenance service and replacement of parts are the
responsibilities 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 your generator
minimize problems and operating expenses. See
your Generac Authorized Service Dealer for service
aids and accessories.
HOW TO OBTAIN SERVICE
When your generator requires servicing or repairs,
simply contact a Generac Authorized Service Dealer
for assistance. Service technicians are factory-trained
and are capable of handling all of your service needs.
When contacting a Generac Authorized Service
Dealer or the factory about parts and service, always
supply the complete model number and serial number of your unit, as given on its data decal, which is
located on your generator.
Model No. ____________ Serial No. ______________
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◆
◆
◆
AUTHORIZED SERVICE
DEALER LOCATION
To locate the GENERAC AUTHORIZED SERVICE
DEALER nearest you, please call this number:
1-800-333-1322
ONLY DEALER LOCATION INFORMATION
CAN BE OBTAINED AT THIS NUMBER.
Table of Contents
IMPACT-36 plus II Recreational Vehicle Generator
Generac®Power Systems, Inc. 1
Part I – Owner’s Manual
Introduction ....................................................Inside Front Cover
Read This Manual Thoroughly ............................................IFC
Contents ..............................................................................IFC
Operation and Maintenance ................................................IFC
How to Obtain Service ........................................................IFC
Authorized Service Dealer Locator Number ............................IFC
Safety Rules ....................................................................................2
Section 1 – General Information ..............................................4
1.1 Generator Identification ..................................................4
1.1.1 Impact-36G plus Features ..................................4
1.1.2 Impact-36LPG plus Features ..............................5
1.1.3 Inverter Features ................................................6
1.2 Generator Applicability ....................................................7
1.3 Safety ..............................................................................7
1.4 Generator Control Panel ..................................................7
1.4.1 Fuel Primer ........................................................7
1.4.2 Start/Stop Switch................................................7
1.4.3 Fuse ....................................................................7
1.4.4 Circuit Breakers ................................................7
1.4.5 Hour Meter ........................................................8
1.5 Automatic Choke (Gasoline Only) ....................................8
1.5.1 Choke Solenoid (Gasoline Only) ........................8
1.5.2 Prechoke (Gasoline Only)....................................8
1.6 Engine Protective Devices ................................................8
1.6.1 Automatic Low Oil Pressure Shutdown ..............8
1.6.2 High Temperature Shutdown..............................8
1.6.3 Overspeed ..........................................................8
1.6.4 Low Voltage ........................................................8
Section 2 – Operation ..................................................................9
2.1 Before Starting the Engine ..............................................9
2.1.1 Installation..........................................................9
2.1.2 Engine Lubrication ............................................9
2.1.3 Fuel Supply ........................................................9
2.1.4 Cooling and Ventilating Air ................................9
2.1.5 Engine Exhaust Gas............................................9
2.2 Starting the Generator ....................................................9
2.3 Stopping the Generator ................................................10
2.4 Applying Loads to Generator ........................................10
2.4.1 Letting the Engine Stabilize ..............................10
2.5 Attention Required After Submersion ............................10
2.6 Operation in High Grass or Brush ................................10
2.7 Operating Precautions ..................................................10
2.8 Fuel Requirements (Gasoling Units) ..............................10
2.9 Fuel Requirements (LP Units) ........................................11
2.10 Engine Oil Requirements ..............................................11
2.11 Gas Generator Specifications ........................................11
2.12 LP Generator Specifications ..........................................11
2.13 Engine Specifications ....................................................11
Section 3 – Maintenance ..........................................................12
3.1 Maintenance ..................................................................12
3.2 Checking the Engine Oil Level ......................................12
3.3 Change Engine Oil ........................................................12
3.4 Change Oil Filter............................................................12
3.5 Engine Air Cleaner ........................................................13
3.6 Clean Air Intake Screen ................................................13
3.7 Engine Spark Plug ........................................................13
3.8 Fuel Filter ......................................................................13
3.9 Inverter..........................................................................14
3.10 Cleaning the Generator ..................................................14
3.11 Battery ..........................................................................14
3.11.1 Once Weekly......................................................14
3.11.2 Every Six Months ..............................................14
3.12 Service and Adjustments ..............................................14
3.12.1 Engine Speed ....................................................14
3.13 Adjusting the Carburetor ..............................................14
3.14 Adjusting Valve Clearance ..............................................15
3.15 Major Service Manual ....................................................15
3.16 Exercising the Generator ..............................................15
3.17 Out of Service Protection ..............................................15
3.18 Return Unit to Service After Storage ..............................15
Notes ..............................................................................................16
PartII – Installation Instructions
Safety Rules..................................................................................18
Section 1 – General Information ............................................20
1.1 Purpose and Scope of the Manual ............................20
1.2 Safety ......................................................................20
1.3 Standards Booklets ..................................................20
1.4 Equipment Description ............................................20
1.5 Engine Generator Operating Speed ..........................20
Section 2 – Installation ............................................................21
2.1 Location and Support ....................................................21
2.1.1 Generator Location ..........................................21
2.1.2 Generator Support............................................21
2.1.3 Suspended Mounting ........................................21
2.1.4 Generator Restraint ..........................................22
2.2 Generator Compartments ..............................................22
2.2.1 Compartment Size ............................................23
2.2.2 Compartment Construction ..............................23
2.2.3 Sound Insulating Materials ..............................24
2.2.4 Compartment Floor Cutouts ............................24
2.2.5 Acoustics ..........................................................25
2.3 Cooling and Ventilating Air ............................................25
2.3.1 Generator Airflow ............................................25
2.3.2 Cooling Air Inlet Openings ................................26
2.3.3 Compensating for Restrictions ..........................27
2.3.4 Inverter Location ..............................................27
2.3.5 Testing the Installation......................................27
2.4 Gasoline Fuel System ....................................................27
2.4.1 Fuel Tank .........................................................27
2.4.2 Generator Fuel Supply Lines ............................28
2.5 Propane Gas Fuel System ..............................................28
2.5.1 Parts Not Included in Fuel System ....................28
2.5.2 Some Important Considerations ......................29
2.5.3 Vapor Withdrawal ............................................29
2.5.4 Primary Regulator ............................................29
2.5.5 Gaseous Carburetion ........................................29
2.5.6 Fuel Supply Lines ............................................30
2.5.7 Excess Flow Valve ............................................30
2.5.8 Leakage Tests....................................................30
2.6 Exhaust System ............................................................30
2.6.1 Muffler and Spark Arrestors ............................30
2.6.2 Type of Exhaust System....................................31
2.6.3 Exhaust System Safety......................................31
2.7 Electrical Connections ..................................................31
2.7.1 Wiring ..............................................................32
2.7.2 Generator AC Connection System ....................32
2.7.3 Isolating Different Power Sources ....................32
2.7.4 Power Supply Cord ..........................................32
2.7.5 Gound Fault Circuit Interrupters......................32
2.7.6 Sensing Harnesses ............................................34
2.8 Battery Installation ........................................................34
2.8.1 Recommended Battery......................................34
2.8.2 Battery Cables ..................................................34
2.8.3 Battery Cable Connections ................................35
2.8.4 Battery Compartment ......................................35
2.9 Optional Accessories......................................................35
2.9.1 Remote Plug-in Receptacle ................................35
2.9.2 Remote Start/Stop Panel ..................................35
Section3–Post-installation Startup Checks ......................36
3.1 Post Installation Tests ....................................................36
3.2 Before Initial Startup ....................................................36
3.3 Initial Start ....................................................................36
3.4 Testing Under Load ......................................................36
3.5 Installation Checklist ....................................................37
Section4–Troubleshooting ....................................................38
4.1 Troubleshooting Guide ..................................................38
Section 5 – Electrical Data........................................................39
Section 6 – Exploded Views and Parts Lists ........................42
Section7–Warranty..................................................................52
2 Generac®Power Systems, Inc.
Study these SAFETY RULES carefully before
installing, operating, or servicing this equipment.
Become familiar with this 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.
Generac cannot possibly anticipate every possible cir
cumstance 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
you use a procedure, work method, or operating
technique that Generac does not specifically recommend, you must satisfy yourself that it is safe for you
and others. You also must make sure the procedure,
work method, or operating technique that you choose
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 operate and maintain this equipment.
Parts of the generator are rotating and/or hot
during operation. Exercise care near running
generators.
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.
GENERAL HAZARDS
• For safety reasons, Generac recommends
that the installation, initial startup, and maintenance of this equipment be performed by a
Generac Authorized Service Dealer.
• 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. Thus, the exhaust
system must be installed properly, in strict compliance with applicable codes and standards.
Following installation, you must do nothing that
might render the system unsafe or in noncompliance with such codes and standards. The generator compartment must be completely vapor-sealed
from the vehicle interior. There must be no possibility of exhaust fumes entering the vehicle interior. Never operate this equipment with a leaking or
defective exhaust system.
• 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 to correct generator operation
and is required to expel toxic fumes and fuel
vapors from the generator compartment. Without
sufficient cooling airflow, the engine/generator
quickly overheats, which seriously damages the
generator. Do not alter the installation or permit
even partial blockage of ventilation provisions, as
this can also seriously affect the safe operation of
the generator.
• When working on this equipment, remain alert at
all times. Never work on the equipment when you
are physically or mentally fatigued.
• Inspect the generator regularly, and contact your
nearest Generac Authorized Service Dealer immediately for parts needing repair or replacement.
• Before performing any maintenance on the generator, disconnect its battery cables to prevent accidental startup. First, disconnect the cable from the
battery post, indicated by a NEGATIVE, NEG, or
(–). Reconnect this cable last.
• Never use the generator, or any of its parts, as a
step. Stepping on the unit can stress and break
parts, resulting in dangerous operating conditions
due to leaking exhaust gases, fuel leakage, oil leakage, etc.
• Never insert any tool or other object through openings in the generator interior, even if the unit is not
running. You might seriously injure yourself or
damage the equipment.
Safety Rules
IMPACT-36 plus II Recreational Vehicle Generator
SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe
operation be copied and posted in potential hazard areas of the recreational vehicle.
Safety should be stressed to all operators and potential operators of this equipment.
The engine exhaust from this product
contains chemicals known to the state
of California to cause cancer, birth
defects, or other reproductive harm.
WARNING:
Generac®Power Systems, Inc. 3
ELECTRICAL HAZARDS
• The generator covered by this manual produces
dangerous electrical voltages and can cause fatal
electrical shock. Avoid contact with bare wires, terminals, connections, etc., while the unit is running.
Before operating the generator, ensure all appropriate covers, guards, and barriers are in place . If
you must work 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.
• During installation onto the vehicle, have the generator properly grounded (bonded), either by solid
mounting to the vehicle frame or chassis, or by
means of an approved bonding conductor. DO
NOT disconnect the bonding conductor, if so
equipped. DO NOT reconnect the bonding conductor to any generator part that might be removed or
disassembled during routine maintenance. If the
grounding conductor must be replaced, use only a
flexible conductor that is of No. 8 American Wire
Gauge (AWG) copper wire minimum.
• In case of an 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.
FIREHAZARDS
• For fire safety, the generator must be installed and
maintained properly. Installation must always
comply with NFPA 70 (latest edition), “National
Electrical Code”, Article 551, and NFPA 1192 (latest edition), “Standard for Recreational Vehicles”,
along with all applicable codes, standards, laws,
and regulations. Adhere strictly to local, state, and
federal 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. After proper installation, do
nothing that might alter the installation and render
the unit in noncompliance with the aforementioned codes, standards, laws, and regulations.
• Keep a fire extinguisher in the vehicle at all times.
Extinguishers rated “ABC” by the National Fire
Protection Association are appropriate for use on
the recreational vehicle generator electrical system. Keep the extinguisher properly charged and
be familiar with its use. If you have any question
pertaining to fire extinguishers, consult your local
fire department.
EXPLOSION HAZARDS
• Do not smoke around the generator. Wipe off any
fuel or oil spills immediately. Ensure that no combustible material is 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 of debris.
• 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. Before
placing this equipment into service, the fuel supply
lines must be properly installed, purged, and leaktested according to applicable fuel-gas codes.
Safety Rules
IMPACT-36 plus II Recreational Vehicle Generator
4 Generac®Power Systems, Inc.
Section 1 – General Information
IMPACT-36 plus II Recreational Vehicle Generator
Please record the following information from the generator DATA DECAL or information decal,
located below the user control panel.
1. Model Number ____________________ 2. Serial Number __________________
3. kW Rating__________________________ 4. Rated Voltage __________________
5. Phase ______________________________ 6. Hertz __________________________
1.1 GENERATOR IDENTIFICATION
1.1.1 IMPACT-36G PLUS II FEATURES
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1. Generator Air Intake Screen
2. Air Cleaner
3. Air Intake Tube
4. Oil Dipstick and Filler Tube
5. Fuel Pump
6. Gasoline Carburetor
7. Fuel Primer Switch
8. Data Decal
9. 12 Volt Battery Connection
10. Engine Start/Stop Switch
11. Generator DC Output Leads
12. Circuit Breaker
13. Fuse
14. Hour Meter
REFERENCE NUMBER IDENTIFICATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Generac®Power Systems, Inc. 5
Section 1 – General Information
IMPACT-36 plus II Recreational Vehicle Generator
Please record the following information from the generator DATA DECAL or information decal,
located below the user control panel.
1. Model Number ____________________ 2. Serial Number __________________
3. kW Rating__________________________ 4. Rated Voltage __________________
5. Phase ______________________________ 6. Hertz __________________________
1.1.2 IMPACT-36LPG PLUS II FEATURES
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1. Generator Air Intake Screen
2. Air Cleaner
3. Air Intake Tube
4. LP Fuel Regulator
5. Oil Dipstick and Filler Tube
6. LP Carburetor
7. LP Fuel Solenoid
8. Fuel Primer Switch
9. Data Decal
10. 12 Volt Battery Connection
11. Engine Start/Stop Switch
12. Generator DC Output Leads
13. Circuit Breaker
14. Fuse
15. Hour Meter
REFERENCE NUMBER IDENTIFICATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
6 Generac®Power Systems, Inc.
Section 1 – General Information
IMPACT-36 plus II Recreational Vehicle Generator
1.1.3 INVERTER FEATURES (PART NO. 0D4885)
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1. Inverter
2. 12 Pin Connection
3. Customer AC Output
4. DC Input
5. Cooling Fan
REFERENCE NUMBER IDENTIFICATION
3
5
2
4
1
Generac®Power Systems, Inc. 7
Section 1 – General Information
IMPACT-36 plus II Recreational Vehicle Generator
1.2 GENERATOR APPLICABILITY
These generators have been designed and manufactured for supplying electrical power for recreational
vehicles. You should not modify the generator or use
it for any application other than for what it was
designed. If there are questions pertaining to its
application, write or call the factory. Do not use the
unit until you have been advised by a competent
authority.
For fire safety, the generator must have been
properly installed in compliance with (1) ANSI
119.2-1975/NFPA 501C-1974 “Standard for
Recreational Vehicles”, Part III, “Installation of
Electrical Systems.” The generator also must
have been installed in strict compliance with
the manufacturer’s detailed installation
instructions. After installation, do nothing
that might render the unit in non-compliance
with such codes, standards and instructions.
This generator has been designed to work with an
inverter (P/N 0D4885). The inverter changes the voltage from the generator from a DC to an AC voltage.
This generator will not operate properly without the
inverter box connected. All repairs of the inverter
must be handled by an authorized service dealer (see
Page 12 in “Maintenance”).
You can use this generator to supply electrical power
for operating 120 volts, single phase, 60 Hertz, electrical loads. These loads can require up to 3400
watts (3.4 kW) for the Impact-34 plus II, or 3600
watts (3.6 kW) for the Impact-36 plus II. The maximum current at 120 volts is 28.3 amperes for the
Impact-34 plus II, or 30 amperes for the Impact-36
plus II.
CAUTION: Do not overload the generator.
Some installations may require that electrical
loads be alternated to avoid overloading.
Applying excessively high electrical loads may
damage the generator and may shorten its
life. Add up the rated watts of all electrical
lighting, appliance, tool and motor loads the
generator will power at one time. This total
should not be greater than the wattage
capacity of the generator. If an electrical
device nameplate gives only volts and amps,
multiply volts times amps to obtain watts
(volts x amps = watts). Some electric motors
require more amps of current for starting than
for continuous operation.
1.3 SAFETY
Before using the generator set, carefully read GENERAL SAFETY RULES inside the cover. Comply with
these RULES to prevent accidents and damage to
equipment and/or property. Generac suggests copying and posting the GENERAL SAFETY RULES in
potential hazard areas of the recreational vehicle.
Safety should be stressed to all operators of this
equipment.
1.4 GENERATOR CONTROL PANEL
Mounted on the generator control panel (Figure 1.1)
are the following features:
Figure 1.1 — Typical Control Panel
1.4.1 FUEL PRIMER
Before starting a cold engine (if it has not been started in more than two weeks), you must press this
switch to bring fuel from the tank to the fuel carburetor. This rocker type switch springs back into its
original position when you release it.
1.4.2 START/STOP SWITCH
To crank and start the engine, hold this switch at its
START position. Release the switch when the engine
starts. To stop an operating engine, press and hold
the switch in its STOP position until the engine shuts
off. The switch center position is the RUN position.
1.4.3 FUSE
Protects the engine DC control circuit against electrical overload. If the fuse element has melted open due
to overloading, the engine cannot be cranked. If you
must replace it, use only an identical replacement
fuse.
1.4.4 CIRCUIT BREAKERS
Protects generator's AC output circuit against
overload, i.e., prevents unit from exceeding
wattage/amperage capacity.
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Circuit Breaker Fuse
Start/Stop
Switch
Fuel Primer
Hour Meter
8 Generac®Power Systems, Inc.
Section 1 – General Information
IMPACT-36 plus II Recreational Vehicle Generator
1.4.5 HOUR METER
Indicates the time the engine-generator has operated,
in hours and tenths of hours. Use the hourmeter
along with the periodic maintenance schedule for
your generator set.
1.5 AUTOMATIC CHOKE (GASOLINE
ONLY)
The engine is equipped with an automatic choke (not
shown) that consists of two main components —
choke solenoid and prechoke.
1.5.1 CHOKE SOLENOID (GASOLINE ONLY)
During engine cranking (start/stop switch at START),
a solid state control circuit board signals the choke
solenoid to actuate and cycle (choke on/choke off)
until engine starts. The choke solenoid thus opens
and closes the carburetor choke valve only when the
engine is cranking. When the engine starts, the choke
cycling stops.
1.5.2 PRECHOKE (GASOLINE ONLY)
The choke system also has a temperature sensitive
metal strip that adjusts the choke valve angle according to ambient temperatures (i.e., in cold ambient
temperatures the choke valve closes more). Once the
engine starts, an element heats the temperature-sensitive strip to a normal operating condition, opening
the choke valve. This may take about 3 minutes in
cooler weather.
1.6 ENGINE PROTECTIVE DEVICES
This generator has a computer that monitors low oil
pressure, oil temperature, engine speed, and low
voltage output. This section discusses those protective devices.
1.6.1 AUTOMATIC LOW OIL PRESSURE
SHUTDOWN
The engine is equipped with an oil pressure sensor
that shuts down the engine automatically when oil
pressure is too low. If the engine shuts down by itself
and the fuel tank has enough fuel, check the engine
oil level.
1.6.1.1 Initial Startup
During initial startup, a time delay built into the shutdown control system allows oil pressure to build. The
delay allows the engine to run for about 10 seconds
before sensing oil pressure.
1.6.1.2 Sensing low pressure
If the system senses low oil pressure during operation, the engine shuts down. If you do restart the
engine after a low oil pressure shutdown and have
not corrected the low oil level, the engine runs for
about 10 seconds as described above then stops.
1.6.2 HIGH TEMPERATURE SHUTDOWN
A temperature switch with normally-open (N.O.) contacts is mounted near the oil filter. If engine temperature were to exceed a preset temperature, the switch
contacts close and the engine shuts down.
1.6.3 OVERSPEED
If engine speed is increased manually (or otherwise)
beyond the control of the computer control system,
the computer disables the load capability of the generator and shuts down the engine.
Do not attempt to physically adjust or control
the engine speed. Equipment damage or personal injury may result.
1.6.4 LOW VOLTAGE
The computer monitors the voltage output of the generator. If voltage sensors indicate that voltage has
dropped below a preset level, the engine will automatically shut down. Once the unit has shutdown,
the computer is automatically reset when you restart
the engine.
NOTE:
The computer allows for the low voltage output
that occurs during startup. A time delay that
allows the engine to start and warm up is programmed into the monitoring system.
Before restarting a generator that has been
shutdown, disconnect all loads the generator
might power by whatever means provided,
such as the recreational vehicle’s main circuit
breaker.
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Generac®Power Systems, Inc. 9
Section 2 – Operation
IMPACT-36 plus II Recreational Vehicle Generator
2.1 BEFORE STARTING THE ENGINE
IMPORTANT: INSTRUCTIONS AND INFORMATION
IN THIS MANUAL ASSUME THE GENERATOR HAS
BEEN PROPERLY INSTALLED, CONNECTED, SERVICED, TESTED AND ADJUSTED BY A QUALIFIED
INSTALLATION TECHNICIAN OR INSTALLATION
CONTRACTOR.
2.1.1 INSTALLATION
Generator installation must have been properly completed so it complies with all applicable codes, standards and regulations and with the manufacturer's
recommendations.
2.1.2 ENGINE LUBRICATION
Have engine crankcase properly serviced with recommended oil before starting. Refer to "Maintenance"
and "Specifications" sections for oil servicing procedures and recommendations.
Any attempt to crank or start the engine
before you have properly serviced it with the
recommended oil may result in engine failure.
2.1.3 FUEL SUPPLY
The engine must have adequate supply of proper fuel
to operate. Before starting, check that sufficient fuel
is available.
NOTE:
On some gasoline installations, the generator
engine may “share” the vehicle’s gasoline fuel
tank with the vehicle engine. Some installations
may provide separate fuel tanks for generator and
vehicle engine.
2.1.4 COOLING AND VENTILATING AIR
Air inlet and outlet openings in the generator compartment must be open and unobstructed for continued proper operation. Without sufficient cooling and
ventilating air flow, the engine-generator quickly overheats, which causes it to automatically shutdown.
Overheating could also damage the unit or your vehicle.
2.1.5 ENGINE EXHAUST GAS
Before starting the generator engine, you should be
sure there is no way for exhaust gases to enter the
vehicle interior and endangering people or animals.
Close windows, doors and other openings in the vehicle that, if open, might permit exhaust gases to enter
the vehicle.
The generator engine gives off deadly carbon
monoxide gas through its exhaust system.
This dangerous gas, if breathed in sufficient
concentrations, can cause unconsciousness or
even death. Do not operate the generator if
its exhaust system is leaking or has been
damaged. Symptoms of carbon monoxide poisoning are (a) inability to think coherently, (b)
vomiting, (c) twitching muscles, (d) throbbing
temples, (e) dizziness, (f) headache, (g) weakness and sleepiness. If you feel any of these
symptoms, move into fresh air immediately. If
symptoms persist, get medical help.
2.2 STARTING THE GENERATOR
IMPORTANT: READ THE VEHICLE MANUFACTURER’S INSTRUCTIONS. THE OWNER/OPERATOR
SHOULD BECOME FAMILIAR WITH THE VEHICLE
IN WHICH THIS GENERATOR IS INSTALLED.
DIFFERENCES EXIST BETWEEN VEHICLES. FOR
EXAMPLE, SOME VEHICLES MAY USE A TRANSFER SWITCH TO ISOLATE DOCKSIDE POWER
FROM THE GENERATOR, WHILE OTHER VEHICLES MAY USE AN ISOLATING RECEPTACLE.
SOME VEHICLES MAY BE EQUIPPED WITH A DC
CONVERTER WHICH ALLOWS THE GENERATOR
TO POWER CERTAIN DC LIGHTING AND OTHER
DC LOADS.
To crank and start the generator engine, proceed as
follows:
1. Turn OFF electrical loads, using whatever means
provided in your vehicle (such as a main line circuit breaker or transfer switch).
NOTE:
If you start the engine with the start/stop switch
on the generator control panel, turn OFF loads by
setting the panel’s main breaker to its “OFF” or
“OPEN” position. Electrical load circuits may be
turned ON after the generator has started, stabilized and warmed up.
NOTE:
On gas units you only need to use the fuel primer
during the initial startup, after the unit has not
been used for an extended period of time (two
weeks) or the fuel line has been disconnected. The
primer is used to prime the fuel pump and carburetor.
2. To crank and start the engine, hold the start/stop
switch at START. Release the switch when the
engine starts.
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10 Generac®Power Systems, Inc.
Section 2 – Operation
IMPACT-36 plus II Recreational Vehicle Generator
If the engine does not start after it has been
cranking for 15 seconds, release the start/stop
switch and try again. Holding the switch for
longer than 15 seconds may damage the
starter motor.
3. Let the engine run at no-load for a few minutes to
stabilize and warm up the engine.
4. Turn ON electrical loads, using whatever means
provided (such as a main circuit breaker or
transfer switch).
NOTE:
If you start a warm generator engine, you may
press the start switch only slightly to engage the
ignition system. However, you should press and
hold the starter switch for a minimum of two (2)
seconds to energize the field boost system. If you
start the engine without energizing the field boost
system, the generator produces no output.
2.3 STOPPING THE GENERATOR
1. Turn OFF all electrical loads, using whatever
means provided (such as a main circuit breaker
or transfer switch).
2. Let the generator run at no-load for a few minutes, to stabilize internal engine-generator temperatures.
3. Hold Start/Stop switch in its STOP position.
2.4 APPLYING LOADS TO GENERATOR
When applying electrical loads to the generator,
observe these guidelines:
• Before applying electrical loads, let the generator
stabilize and warm up for a minute or two.
• DO NOT overload the generator.
2.4.1 LETTING ENGINE STABILIZE
The generator supplies correctly rated frequency and
voltage only at the proper governed speed. Some electrical appliances may be extremely sensitive to voltage and frequency. Incorrect frequencies and/or voltages can damage those appliances.
If electrical loads are applied at reduced operating
speeds, such loads imposed on the engine when sufficient power is not available may shorten engine life.
Never turn ON electrical loads until after the generator engine has started and stabilized ON-speed.
2.5 ATTENTION REQUIRED AFTER
SUBMERSION
If the motor home generator has been submerged in
water, it must NOT be started or operated. Following
any submersion in water, have an authorized
Generac Service Facility thoroughly clean and dry the
generator.
2.6 OPERATION IN HIGH GRASS OR
BRUSH
Never operate the generator while the vehicle is
parked in high grass, weeds, brush or leaves. Such
materials can ignite and burn from the heat of the
exhaust system. The generator exhaust system
becomes extremely hot during operation and remains
hot for a long time after it has shut down.
2.7 OPERATING PRECAUTIONS
Never operate the motor home generator set while the
vehicle is parked over dry leaves, dry grass or any
other combustible substance. The generator’s
exhaust system becomes extremely hot and can cause
a fire if it is too close to combustible materials.
2.8 FUEL REQUIREMENTS (GASOLINE
UNITS)
These generators are equipped with gasoline fuel systems as standard equipment. Specific installations
may provide either a separate fuel tank for the generator, or the generator may “share” the vehicle engine’s
fuel tank.
NOTE:
Installations using a “shared” fuel tank may have
a generator fuel pickup tube that is shorter than
the vehicle engine’s pickup tube. Such an
arrangement causes the generator engine to “run
out of gas” while adequate fuel for the vehicle
remains in the tank.
To reduce lead and carbon deposits use high quality
UNLEADED gasoline with the generator. Leaded
REGULAR grade gasoline is an acceptable substitute.
NOTE:
Using “Unleaded” gasoline contributes to longer
engine valve life by reducing lead and carbon
deposits.
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Generac®Power Systems, Inc. 11
Section 2 – Operation
IMPACT-36 plus II Recreational Vehicle Generator
Generac does not recommend using any gasoline containing alcohol, it must not contain
more than 10 percent ethanol and it must be
removed from the generator during storage.
Do NOT use any gasoline containing
methanol. If you use gasoline with alcohol,
inspect more frequently for fuel leaks and
other abnormalities.
FUEL CONSUMPTION (IN GALLONS PER HOUR):
2.9 FUEL REQUIREMENTS (LP UNITS)
These generators are equipped with a liquefied petroleum (LP) gas fuel system. LP gas is usually supplied
as a liquid in pressure tanks.
These generators require a “vapor withdrawal” type
fuel system. This type of gaseous fuel system uses
the vapors forming above the liquid fuel in the storage tank. Air temperature around the storage tank
must be high enough to sustain adequate fuel vaporization. In colder climates, you may need to use an
independent heat source to be sure the fuel sufficiently vaporizes in the storage tank.
LP gas may consist of propane, butane or a mixture
of the two gases. Propane vaporizes at temperatures
as low as -20°F (-29°C), but butane returns to its liquid state when the temperature drops below about
32°F (0°C). For that reason, a higher ratio of propane
is desired in the gas mixture when temperatures
drop below freezing.
2.10 ENGINE OIL REQUIREMENTS
The recommended oils include the following:
• During summer months: SAE 30. An acceptable
substitute is SAE 10W-30.
• During winter months: SAE 5W30. DO NOT USE
SAE 10W-40.
Crankcase and oil filter capacity is about 950ml or
one (1) quart. Use no special additives. See
“Maintenance” section for oil level check and fill procedures.
2.11 GAS GENERATOR SPECIFICATIONS
Model ..................................................Impact-36G plus II
Rated Maximum Continuous
AC Power Output ..............................3600 watts (3.6 kW)
Rated Voltage ................................................120 volts AC
Rated Maximum Continuous
Current at 120 volts ..................................30 AC amperes
Phase ............................................................Single Phase
Rated AC Frequency ................................................60 Hz.
Recommended Battery
Cranking Current ..............................................400 amps
Gross Weight ............................................................97 lbs
Maximum Cranking Current..............................250 Amps
Maximum Charging Current ..................................2 Amps
2.12 LP GENERATOR SPECIFICATIONS
Model ..............................................Impact-36LPG plus II
Rated Maximum Continuous
AC Power Output ..............................3400 watts (3.4 kW)
Rated Voltage ................................................120 volts AC
Rated Maximum Continuous
Current at 120 volts................................28.3 AC amperes
Phase ............................................................Single Phase
Rated AC Frequency ................................................60 Hz.
Recommended Battery
Cranking Current ..............................................400 amps
Gross Weight ............................................................99 lbs
Maximum Cranking Current..............................250 Amps
Maximum Charging Current ..................................2 Amps
2.13 ENGINE SPECIFICATIONS
Type of Engine ......................................................GN-220
Cooling Method ..................................................Air-cooled
Displacement............................................................220cc
Type of Governor ..............................................Electronic
Air Cleaner ..................................................Paper element
Starter ..................................................12 volt DC electric
Ignition System ................................................Solid state
Recommended Spark Plugs ................Champion RC12YC
Spark Plug Gap ..................................0.030 inch (0.8mm)
LOAD GASOLINE LP
NO 0.14 0.20
HALF 0.32 0.41
FULL 0.54 0.77
12 Generac®Power Systems, Inc.
Section 3 – Maintenance
IMPACT-36 plus II Recreational Vehicle Generator
3.1 MAINTENANCE
This section includes information about simple
maintenance which includes the following tasks:
• Checking engine oil level.
• Changing engine oil.
• Changing oil filter.
• Air cleaner maintenance.
• Cleaning the air intake screen.
Cleaning spark arrestor.
• Cleaning spark plug.
Replacing fuel filter.
Servicing inverter.
3.2 CHECKING ENGINE OIL LEVEL
Check engine crankcase oil level at least every eight
hours of operation, or before each use (Figure 3.1).
• Be sure the generator is as level as possible.
• Remove oil dipstick and wipe dry with clean, lint-
free cloth.
• Install and tighten oil dipstick, then remove again.
• Oil should be at dipstick FULL mark. If necessary,
add the recommended oil to the FULL mark only.
DO NOT FILL ABOVE “FULL” MARK.
• Install and tighten oil dipstick cap before operating
the engine.
Figure 3.1 — Oil Dipstick and Fill Tube
NOTE:
See “Engine Oil Requirements” on Page 11 for
recommended oils.
3.3 CHANGE ENGINE OIL
Change engine oil after the first 8 hours of operation.
Thereafter, change oil every 100 operating hours.
Change oil more frequently if operating consistently
under heavy load or at high ambient temperatures.
• Warm up engine for at least five minutes, then shut
down.
• With engine still warm from running, clean area
around oil drain plug and remove oil drain plug
(Figure 3.2). Drain oil completely into a suitable
container.
• When oil has drained, install and tighten drain
plug.
• Remove oil dipstick and fill crankcase with the
recommended oil (See Page 11). The engine
crankcase can hold about 1 quart (950ml). DO
NOT FILL ABOVE “FULL” MARK.
• Install and tighten dipstick cap before operating
engine.
3.4 CHANGE OIL FILTER
Replace the engine oil filter after the first 8 hours of
operation, every 100 operating hours thereafter.
• Turn oil filter counterclockwise to remove (Figure
3.2).
Figure 3.2 — Oil Drain Plug and Engine Oil
Filter
• Coat gasket of new filter with engine oil.
• Turn new filter clockwise until its gasket contacts
lightly with the filter adapter. Then tighten an additional 3/4 to one turn by hand.
• Run engine and check for leaks.
NOTE:
Check oil level and fill to full mark after checking
for leaks. Filter will retain some oil.
Oil Dipstick and Fill Tube
Generac®Power Systems, Inc. 13
Section 3 – Maintenance
IMPACT-36 plus II Recreational Vehicle Generator
3.5 ENGINE AIR CLEANER
Paper Filter: Once every 25 operating hours or once
each year (whichever comes first), clean or replace
the paper filter (Figure 3.3). Follow the steps on page
12.
Figure 3.3 — Engine Air Cleaner Assembly
• Remove air cleaner cover, then remove paper filter.
• Clean air filter by gently tapping it on a solid surface. If the filter is too dirty, replace it with a new
one. Dispose of the old filter properly.
• Clean air cleaner cover then insert new paper filter
into cover and assemble to the base of the air
cleaner.
3.6 CLEAN AIR INTAKE SCREEN
Clean all foreign material from the air intake screen
(Figure 3.4) at lease once every 100 hours of operation. Clean more often if necessary.
Inspect the area around the generator exhaust muffler periodically and remove all grass, leaves, dirt,
etc. from this area.
Figure 3.4 — Clean Air Intake Screen
3.7 ENGINE SPARK PLUG
Clean engine spark plug and set gap to 0.030 inch
(0.76mm) every 100 hours of operation (Figure 3.5).
Clean by scraping or wire brushing and washing with
commercial solvent. DO NOT BLAST CLEAN SPARK
PLUG.
Figure 3.5 — Setting Gap on Spark Plug
Sparking can occur if wire terminal does not
fit firmly over spark plug terminal end. If necessary, reform wire terminal to obtain a tight
fit.
3.8 FUEL FILTER
Remove and replace fuel filter (Figure 3.6) every 100
hours of operation or once each year, whichever
occurs first.
Figure 3.6 — Fuel Filter
Air Intake Screen
To Fuel Pump
Fuel Filter
Customer Fuel Connection
14 Generac®Power Systems, Inc.
Section 3 – Maintenance
IMPACT-36 plus II Recreational Vehicle Generator
3.9 INVERTER
All repairs of the inverter must be handled by an
authorized service dealer (see Figure 3.7).
Figure 3.7 — Inverter Warning Label
3.10 CLEANING THE GENERATOR
Keep your generator set as clean and dry as possible.
Dirt and moisture that are permitted to accumulate
on electrical windings have an adverse affect on the
insulation resistance of those windings.
Moisture that is allowed to remain in contact with
windings will be retained in voids and cracks of the
windings. Dirt makes the problem worse, since it
tends to hold the moisture into contact with the windings. Salt, as from sea air, worsens the problem since
it tends to absorb moisture from the air. The combination of salt and moisture makes a good electrical
conductor.
Do NOT use a forceful spray of water to clean
the generator. Water will enter the generator
interior and cause problems, and may also
contaminate the generator fuel system.
3.11 BATTERY
All lead-acid storage batteries will discharge when
not in use. Inspect the generator battery as follows:
3.11.1 ONCE WEEKLY
Inspect battery posts and cables for tightness, corrosion. Clean and/or tighten as necessary.
Also check battery fluid level, and, if necessary, fill
with DISTILLED WATER ONLY. DO NOT USE TAP
WATER IN BATTERY.
3.11.2 EVERY SIX MONTHS
Have the battery state of charge and condition
checked by an automotive service facility. This should
be done with an automotive type battery hydrometer.
Storage batteries give off explosive hydrogen
gas. This 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 caustic 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 you spill
the fluid, 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 any battery has discharged, remove it from
the vehicle for recharging.
3.12 SERVICE AND ADJUSTMENTS
3.12.1 ENGINE SPEED
Engine speed is completely computer-controlled.
There is no adjustment for speed on the unit. The
computer adjusts the engine speed using an electronic governor throttle control. The computer monitors
the demand for power and adjusts the engine speed
accordingly. This allows the engine to produce only
the power required, resulting in fuel economy as well
as lowering the overall noise emitted.
NOTE:
The computer will disable the electrical load capabilities of the generator and enter a fault condition
if you accelerate the throttle manually or any
other way.
3.13 ADJUSTING THE CARBURETOR
The carburetor of your generator is preset at the factory. The carburetor should not be tampered with, as
this will void the emission control system warranty. If
your generator is used at altitudes in excess of 5,000
feet, consult your Generac Authorized Service Facility
regarding high altitude jetting changes.
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Section 3 – Maintenance
IMPACT-36 plus II Recreational Vehicle Generator
3.14 ADJUSTING VALVE CLEARANCE
After the first 50 hours of operation, you should
adjust the valve clearance in the engine.
When adjusting valve clearance, the engine should be
at room temperature and the piston should be at Top
Dead Center (TDC) of its compression stroke (both
valves closed). Correct clearance is 0.001-0.003 inch
(0.03-0.07mm). Adjust valve clearance as follows:
1. Loosen the rocker arm jam nut. Use an allen
wrench to turn the pivot ball stud while checking
clearance between the rocker arm and the valve
stem with a feeler gauge (Figure 3.8).
Figure 3.8 — Adjusting Valve Clearance
2. When valve clearance is correct, hold the pivot
ball stud with the allen wrench and tighten the
rocker arm jam nut with a crows foot. Tighten the
jam nut to 65-85 inch-pounds torque. After tightening the jam nut, recheck valve clearance to
make sure it did not change (Figure 3.9).
Figure 3.9 — Tightening Jam Nut
3.15 MAJOR SERVICE MANUAL
To obtain a service manual for your generator, order
it from your dealer/distributor or contact the factory.
Be sure to identify your unit’s MODEL NUMBER and
SERIAL NUMBER.
3.16 EXERCISING THE GENERATOR
Generac recommends that you start and operate the
generator at least once every seven days. Let the unit
run for at least 30 minutes to “exercise” the engine.
3.17 OUT OF SERVICE PROTECTION
If you cannot exercise the generator every seven days
and it is to be out of service longer than 30 days, prepare the generator for storage as follows:
• Start the engine and let it warm up.
• While the engine is still warm from running, drain
the oil completely. Refill crankcase with recommended oil. See “Specifications.”
• Attach a tag to the engine indicating the viscosity
and classification of the oil in the crankcase.
• Remove spark plug and add about 1/2 ounce
(15ml) of clean, fresh engine oil into spark plug
threaded opening. Crank engine several times to
distribute oil, then install and tighten spark plug.
• Remove the battery and store in a cool, dry room
on a wooden board. Never store the battery on any
concrete or earthen floor.
• Clean and wipe the entire generator.
3.18 RETURN UNIT TO SERVICE AFTER
STORAGE
To return the unit to service after storage, proceed as
follows:
• Check tag on engine for oil viscosity and classification. Verify that the correct recommended oil is
used in engine. If necessary, drain and refill with
proper oil.
• Check battery. Fill all cells to the proper level with
distilled water. DO NOT USE TAP WATER IN THE
BATTERY. Recharge battery to 100% state of
charge, or, if defective, replace the battery.
• Turn OFF all electrical loads, then start the engine.
• Let engine warm up.
• Apply electrical loads up to at least 50% of the
unit’s rated wattage capacity.
• When engine is thoroughly warmed up, shut it
down.
THE GENERATOR IS NOW READY FOR SERVICE.
Generac®Power Systems, Inc. 15
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