Generac Power Systems 00941-4 Service manual

Owner’s Manual and
Installation Instructions
Air-cooled Recreational Vehicle Generator
• Model No: 00941-4
IMPACT-36 plus II with Inverter
This manual should remain with the unit.

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 recre-
ational vehicles.
READ THIS MANUAL THOROUGHLY
If any portion of this manualis not understood, con-
tact the 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 per-
sonnel to special instructions about a particular
operation that may be hazardous if performed incor-
rectly or carelessly. Observe them carefully. Their def-
initions are as follows:
After this heading, read instructions that, if not
strictly complied with, will result in serious person-
al injury, death or severe property damage.
After this heading, read instructions that, if not
strictly complied with, may result in personal
injury or property damage.
After this heading, read instructions that, if not
strictly complied with, could result in damage to
equipment and/or property.
NOTE:
After this heading, read explanatory statements
that require special emphasis.
These safety warnings cannot eliminate the hazards
that they indicate. Common sense and strict compli-
ance with the special instructions while performing
the service are essential 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 infor-
mation that, if not followed, could endanger
personal safety and/or property to self and oth-
ers.
This symbol points out potential explosion haz-
ard.
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 under-
stand 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
000941-4. In addition, the latter portion of this man-
ual contains information necessary for the proper
installation of these generators.
OPERATION AND MAINTENANCE
It is the operator's responsibility to perform all safe-
ty 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 ser-
vice and replacement of parts are the responsibilities
of the owner/operator and, as such, are not consid-
ered defects in materials or workmanship within the
terms of the warranty. Individual operating habits
and usage contribute to the need for maintenance
service.
Proper maintenance and care of the generator mini-
mize problems and operating expenses. See the
Generac Authorized Service Dealer for service aids
and accessories.
HOW TO OBTAIN SERVICE
When the 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 service needs.
When contacting a Generac Authorized Service
Dealer or the factory about parts and service, always
supply the complete model number and serial num-
ber of the unit, as given on its data decal, which is
located on the generator.
Model No. ____________ Serial No. ______________
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DANGER
◆
AUTHORIZED SERVICE
DEALER LOCATION
To locate the nearest GENERAC AUTHORIZED
SERVICE DEALER, 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
1.2 Generator Applicability....................................................6
1.3 Safety ..............................................................................6
1.4 Generator Control Panel ..................................................6
1.5 Engine Protective Devices ................................................7
Section 2 – Operation..................................................................7
2.1 Before Starting the Engine ..............................................7
2.2 Starting the Generator ....................................................8
2.3 Stopping the Generator ..................................................8
2.4 Applying Loads to Generator ..........................................9
2.5 Attention Required After Submersion..............................9
2.6 Operation in High Grass or Brush ..................................9
2.7 Operating Precautions ....................................................9
2.8 Fuel Requirements (LP Units) ..........................................9
2.9 Engine Oil Requirements ................................................9
2.10 LP Generator Specifications ............................................9
2.11 Engine Specifications ......................................................9
Section 3 – Maintenance ..........................................................10
3.1 Maintenance ..................................................................10
3.2 Checking the Engine Oil Level ......................................10
3.3 Change Engine Oil ........................................................10
3.4 Change Oil Filter............................................................10
3.5 Engine Air Cleaner ........................................................11
3.6 Clean Air Intake Screen ................................................11
3.7 Engine Spark Plug ........................................................11
3.8 Inverter ..........................................................................11
3.9 Cleaning the Generator ..................................................11
3.10 Battery ..........................................................................12
3.11 Service and Adjustments ..............................................12
3.12 Adjusting the Carburetor ..............................................12
3.13 Adjusting Valve Clearance ..............................................12
3.14 Major Service Manual ....................................................13
3.15 Exercising the Generator ..............................................13
3.16 Out of Service Protection ..............................................13
3.17 Return Unit to Service After Storage..............................13
Section 4 – Notes........................................................................14
Part II – Installation Instructions
Safety Rules..................................................................................16
Section 1 – General Information ............................................18
1.1 Purpose and Scope of the Manual ............................18
1.2 Safety ......................................................................18
1.3 Standards Booklets ..................................................18
1.4 Equipment Description ............................................18
1.5 Engine Generator Operating Speed ..........................18
Section 2 – Installation ............................................................19
2.1 Location and Support....................................................19
2.2 Generator Compartments ..............................................20
2.3 Cooling and Ventilating Air ............................................23
2.4 Propane Gas Fuel System ..............................................25
2.5 Exhaust System ............................................................27
2.6 Electrical Connections ..................................................28
2.7 Battery Installation ........................................................31
2.8 Optional Accessories......................................................32
Section 3 – Post-installation Startup Checks ......................33
3.1 Post Installation Tests ....................................................33
3.2 Before Initial Startup ....................................................33
3.3 Initial Start ....................................................................33
3.4 Testing Under Load ......................................................33
3.5 Installation Checklist ....................................................34
Section 4 – Troubleshooting ....................................................35
4.1 Troubleshooting Guide ..................................................35
Section 5 – Electrical Data........................................................36
Section 6 – Exploded Views and Parts Lists ........................38
Section 7 – Installation Diagram ............................................47
Section 8 – Warranty..................................................................48

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 reli-
ably 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 warn-
ings in this manual, and on tags and decals
affixed to the unit, are, therefore, not all-inclusive. If
using a procedure, work method, or operating tech-
nique that Generac does not specifically recommend,
satisfy yourself that it is safe for others. Also make
sure the procedure, work method, or operating tech-
nique chosen does not render the generator unsafe.
Despite the safe design of this generator,
operating this equipment imprudently, neglect-
ing its maintenance, or being careless can cause
possible injury or death. Permit only responsi-
ble and capable persons to operate and main-
tain 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 generator engine releases DEADLY carbon
monoxide gas through its exhaust system. This
dangerous gas, if breathed in sufficient concentra-
tions, can cause unconsciousness or even death.
Never operate the generator set with the vehicle
inside any garage or other enclosed area. DO NOT
OPERATE THE GENERATOR IF THE EXHAUST
SYSTEM IS LEAKING OR HAS BEEN DAMAGED.
SYMPTOMS OF CARBON MONOXIDE POISON-
ING ARE (a) inability to think coherently, (b) nau-
sea, (c) vomiting, (d) twitching muscles, (e) throb-
bing temples, (f) dizziness, (g) headaches, (h)
weakness, and (i) sleepiness. IF EXPERIENCING
ANY OF THESE SYMPTOMS, MOVE INTO FRESH
AIR IMMEDIATELY. IF SYMPTOMS PERSIST, GET
MEDICAL HELP. Shut down the generator and do
not operate it until it has been inspected and
repaired.
• Never sleep in the vehicle while the genset is run-
ning unless the vehicle has a working carbon
monoxide detector. The exhaust system must be
installed in accordance with the genset installation
manual. Make sure there is ample fresh air when
operating the genset in a confined area.
• The engine exhaust fumes contain carbon monox-
ide, which can be DEADLY. This dangerous gas, if
breathed in sufficient concentrations, can cause
unconsciousness or even death. Thus, the exhaust
system must be installed properly, in strict com-
pliance with applicable codes and standards.
Following installation, do nothing that might ren-
der the system unsafe or in noncompliance with
such codes and standards. The generator com-
partment 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 venti-
lating 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.
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DANGER
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:
!!
This product contains or emits chemicals
known to the state of California to cause
cancer, birth defects or other reproductive harm.
WARNING:
!!

Generac®Power Systems, Inc. 3
• 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 Generac Authorized Service Dealer imme-
diately for parts needing repair or replacement.
• Before performing any maintenance on the genera-
tor, disconnect its battery cables to prevent acci-
dental 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 leak-
age, etc.
• Never insert any tool or other object through open-
ings in the generator interior, even if the unit is not
running. Seriouse injury or damage to the equip-
ment may occur.
ELECTRICAL HAZARDS
• The generator covered by this manual produces
dangerous electrical voltages and can cause fatal
electrical shock. Avoid contact with bare wires, ter-
minals, connections, etc., while the unit is running.
Before operating the generator, ensure all appro-
priate covers, guards, and barriers are in place . If
work must be donearound 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 gen-
erator 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 conduc-
tor 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 nonconduct-
ing 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 equip-
ment. Jewelry can conduct electricity, resulting in
electric shock, or may get caught in moving com-
ponents, causing, injury.
FIRE HAZARDS
• For fire safety, the generator must be installed and
maintained properly. Installation must always
comply with NFPA 70 (latest edition), “National
Electrical Code”, Article 551, and NFPA 1192 (lat-
est 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 accor-
dance 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 aforemen-
tioned 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 sys-
tem. Keep the extinguisher properly charged and
be familiar with its use. If there are any questions
pertaining to fire extinguishers, consult the local
fire department.
EXPLOSION HAZARDS
• Do not smoke around the generator. Wipe off any
fuel or oil spills immediately. Ensure that no com-
bustible material is left in the generator compart-
ment, or on or near the generator, as FIRE or
EXPLOSION may result. Keep the area surround-
ing 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 fre-
quently and correct any leaks immediately. Before
placing this equipment into service, the fuel supply
lines must be properly installed, purged, and leak-
tested 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
IMPACT 36 plus II Recreational Vehicle Generator
1.1 GENERATOR IDENTIFICATION
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 __________________________
1.1.1 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
16. Inverter Harness Connector
REFERENCE NUMBER IDENTIFICATION
12
3
4
5
6
7
8
9
10
11
12
13 14 15
16

Generac®Power Systems, Inc. 5
Section 1 – General Information
IMPACT-36 plus II Recreational Vehicle Generator
1.1.2 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

6 Generac®Power Systems, Inc.
Section 1 – General Information
IMPACT-36 plus II Recreational Vehicle Generator
1.2 GENERATOR APPLICABILITY
These generators have been designed and manufac-
tured for supplying electrical power for recreational
vehicles. Do 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
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 volt-
age 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”).
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-36 plus II. The maximum current
at 120 volts is 28.3 amperes for the Impact-36 plus
II.
Do not overload the generator. Some installa-
tions 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 continu-
ous operation.
1.3 SAFETY
Before using the generator set, carefully read GEN-
ERAL SAFETY RULES inside the cover. Comply with
these RULES to prevent accidents and damage to
equipment and/or property. Generac suggests copy-
ing 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 start-
ed in more than two weeks), press this switch to
bring fuel from the tank to the fuel carburetor. This
rocker type switch springs back into its original posi-
tion when released.
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 electri-
cal overload. If the fuse element has melted open due
to overloading, the engine cannot be cranked. If the
fuse must be replaced, use only an identical replace-
ment 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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DANGER
Circuit Breaker Fuse
Start/Stop Switch
Fuel Primer
Hour Meter

Generac®Power Systems, Inc. 7
Section 2 – Operation
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 the
generator set.
1.5 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 protec-
tive devices.
1.5.1 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.
1.5.1.1 Initial Startup
During initial startup, a time delay built into the shut-
down control system allows oil pressure to build. The
delay allows the engine to run for about 10 seconds
before sensing oil pressure.
1.5.1.2 Sensing low pressure
If the system senses low oil pressure during opera-
tion, the engine shuts down. If the engine has not
been restarted after a low oil pressure shutdown, and
the low oil level has not been corrected, the engine
runs for about 10 seconds as described above, then
stops.
1.5.2 HIGH TEMPERATURE SHUTDOWN
A temperature switch with normally-open (N.O.) con-
tacts is mounted near the oil filter. If engine tempera-
ture were to exceed a preset temperature, the switch
contacts close and the engine shuts down.
1.5.3 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 gen-
erator and shuts down the engine.
Do not attempt to physically adjust or control
the engine speed. Equipment damage or per-
sonal injury may result.
1.5.4 LOW VOLTAGE
The computer monitors the voltage output of the gen-
erator. If voltage sensors indicate that voltage has
dropped below a preset level, the engine will auto-
matically shut down. Once the unit has shutdown,
the computer is automatically reset when the engine
is restarted.
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 pro-
grammed 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.
2.1 BEFORE STARTING THE ENGINE
IMPORTANT: INSTRUCTIONS AND INFORMATION
IN THIS MANUAL ASSUME THE GENERATOR HAS
BEEN PROPERLY INSTALLED, CONNECTED, SER-
VICED, TESTED AND ADJUSTED BY A QUALIFIED
INSTALLATION TECHNICIAN OR INSTALLATION
CONTRACTOR.
2.1.1 INSTALLATION
Generator installation must have been properly com-
pleted so it complies with all applicable codes, stan-
dards and regulations and with the manufacturer's
recommendations.
2.1.2 ENGINE LUBRICATION
Have engine crankcase properly serviced with recom-
mended oil before starting. Refer to "Maintenance"
and "Specifications" sections for oil servicing proce-
dures and recommendations.
Any attempt to crank or start the engine
before it has been properly serviced 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.
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8 Generac®Power Systems, Inc.
Section 2 – Operation
IMPACT-36 plus II Recreational Vehicle Generator
2.1.4 COOLING AND VENTILATING AIR
Air inlet and outlet openings in the generator com-
partment must be open and unobstructed for contin-
ued proper operation. Without sufficient cooling and
ventilating air flow, the engine-generator quickly over-
heats, which causes it to automatically shutdown.
Overheating could also damage the unit or the vehicle.
2.1.5 ENGINE EXHAUST GAS
Before starting the generator engine, 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 releases DEADLY carbon
monoxide gas through its exhaust system. This
dangerous gas, if breathed in sufficient concen-
trations, can cause unconsciousness or even
death. Never operate the generator set with
the vehicle inside any garage or other enclosed
area. DO NOT OPERATE THE GENERATOR IF THE
EXHAUST SYSTEM IS LEAKING OR HAS BEEN
DAMAGED. SYMPTOMS OF CARBON MONOX-
IDE POISONING ARE (a) inability to think coher-
ently, (b) nausea, (c) vomiting, (d) twitching
muscles, (e) throbbing temples, (f) dizziness, (g)
headaches, (h) weakness, and (i) sleepiness. IF
EXPERIENCING ANY OF THESE SYMPTOMS,
MOVE INTO FRESH AIR IMMEDIATELY. IF SYMP-
TOMS PERSIST, GET MEDICAL HELP. Shut down
the generator and do not operate it until it has
been inspected and repaired.
Never sleep in the vehicle while the genset is
running unless the vehicle has a working carbon
monoxide detector. The exhaust system must be
installed in accordance with the genset installa-
tion manual. Make sure there is ample fresh air
when operating the genset in a confined area.
2.2 STARTING THE GENERATOR
IMPORTANT: READ THE VEHICLE MANUFACTUR-
ER’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 TRANS-
FER SWITCH TO ISOLATE DOCKSIDE POWER
FROM THE GENERATOR, WHILE OTHER VEHI-
CLES 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 the vehicle (such as a main line cir-
cuit breaker or transfer switch).
NOTE:
If the engine is started 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, stabi-
lized and warmed up.
NOTE:
On gas units, use of the fuel primer is needed only
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 carbu-
retor.
2. To crank and start the engine, hold the start/stop
switch at START. Release the switch when the
engine starts.
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 starting a warm generator engine, press the start
switch only slightly to engage the ignition system.
However, press and hold the starter switch for a
minimum of two (2) seconds to energize the field
boost system. If starting the engine without ener-
gizing the field boost system, the generator pro-
duces 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 min-
utes, to stabilize internal engine-generator tem-
peratures.
3. Hold Start/Stop switch in its STOP position.
!
!
DANGER
!
DANGER
◆
◆

Generac®Power Systems, Inc. 9
Section 2 – Operation
IMPACT-36 plus II Recreational Vehicle Generator
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 elec-
trical appliances may be extremely sensitive to volt-
age and frequency. Incorrect frequencies and/or volt-
ages can damage those appliances.
If electrical loads are applied at reduced operating
speeds, such loads imposed on the engine when suf-
ficient power is not available may shorten engine life.
Never turn ON electrical loads until after the genera-
tor 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 (LP UNITS)
These generators are equipped with a liquefied petro-
leum (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, use of an independent heat source
may be needed to be sure the fuel sufficiently vapor-
izes 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 liq-
uid 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.
FUEL CONSUMPTION (IN GALLONS PER HOUR):
2.9 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 pro-
cedures.
2.10 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
2.11 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 RC14YC
Spark Plug Gap ..................................0.030 inch (0.8mm)
◆
LOAD LP
NO 0.20
HALF 0.41
FULL 0.77

10 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”, Section 2.9 for
recommended oils.
3.3 CHANGE ENGINE OIL
Change engine oil after the first 25 hours of opera-
tion. Thereafter, change oil every 100 operating
hours. Change oil more frequently if operating con-
sistently under heavy load or at high ambient tem-
peratures.
• 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 25 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 addi-
tional 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. 11
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 sur-
face. 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 opera-
tion. Clean more often if necessary.
Inspect the area around the generator exhaust muf-
fler 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 nec-
essary, reform wire terminal to obtain a tight
fit.
3.8 INVERTER
All repairs of the inverter must be handled by an
authorized service dealer (see Figure 3.7).
Figure 3.7 — Inverter Warning Label
3.9 CLEANING THE GENERATOR
Keep the 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 elec-
trical conductor.
!
Air Intake Screen

12 Generac®Power Systems, Inc.
Section 3 – Maintenance
IMPACT-36 plus II Recreational Vehicle Generator
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.
3.10 BATTERY
All lead-acid storage batteries will discharge when
not in use. Inspect the generator battery as follows:
3.10.1 ONCE WEEKLY
Inspect battery posts and cables for tightness, corro-
sion. 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.
3.10.2 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 explo-
sion can shatter the battery and cause blind-
ness or other injury. Any area that houses a
storage battery must be properly ventilated.
Do not allow smoking, open flame, sparks or
any spark producing tools or equipment near
the battery.
Battery electrolyte fluid is an extremely caus-
tic sulfuric acid solution that can cause severe
burns. Do not permit fluid to contact eyes,
skin, clothing, painted surfaces, etc. Wear pro-
tective goggles, protective clothing and
gloves when handling a battery. If fluid is
spilled, flush the affected area immediately
with clear water.
Do not use any jumper cables or booster bat-
tery to crank and start the generator engine.
If any battery has discharged, remove it from
the vehicle for recharging.
3.11 SERVICE AND ADJUSTMENTS
3.11.1 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 electron-
ic 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 con-
dition if the throttle is accelerated manually or
any other way.
3.12 ADJUSTING THE CARBURETOR
The carburetor of the generator is preset at the facto-
ry. The carburetor should not be tampered with, as
this will void the emission control system warranty. If
the generator is used at altitudes in excess of 5,000
feet, consult the Generac Authorized Service Facility
regarding high altitude jetting changes.
3.13 ADJUSTING VALVE CLEARANCE
After the first 50 hours of operation, 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
◆
!
!
DANGER
◆
◆
!

Generac®Power Systems, Inc. 13
Section 3 – Maintenance
IMPACT-36 plus II Recreational Vehicle Generator
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 tight-
ening the jam nut, recheck valve clearance to
make sure it did not change (Figure 3.9).
Figure 3.9 — Tightening Jam Nut
3.14 MAJOR SERVICE MANUAL
To obtain a service manual for the generator, order it
from the dealer/distributor. Be sure to identify the
unit’s MODEL NUMBER and SERIAL NUMBER.
3.15 EXERCISING THE GENERATOR
Generac recommends that the generator is started
and operated at least once every seven days. Let the
unit run for at least 30 minutes to “exercise” the
engine.
3.16 OUT OF SERVICE PROTECTION
If the generator cannot be exercised every seven days,
and it is to be out of service longer than 30 days, pre-
pare 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 recom-
mended 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.
3.17 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 classifica-
tion. 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.

14 Generac®Power Systems, Inc.
Section 4 – Notes
IMPACT-36 plus II Recreational Vehicle Generator

PART II –
INSTALLATION
INSTRUCTIONS
ONLY QUALIFIED ELECTRICIANS OR CONTRACTORS
SHOULD ATTEMPT INSTALLATION!!
DANGER

16 Generac®Power Systems, Inc.
Safety Rules
IMPACT-36 plus II Recreational Vehicle Generator
NOTICE TO INSTALLER
These Installation Instructions have been published
by Generac to aid in the installation of the products
described in this manual. Generac assumes that
installation personnel are familiar with the procedures
for installing such products, or similar products that
Generac manufactures. Generac also assumes that
personnel have been trained in the recommended
installation procedures for these products and that
such training includes (a) use of common hand tools,
(b) use of special Generac tools, and (c) use of any
tools and/or equipment from other suppliers.
Generac cannot possibly know of, nor advise the
recreational vehicle trade of, all conceivable methods,
procedures, or techniques by which to perform an
installation. Nor can Generac anticipate every possi-
ble hazard that might result from each installation
method, procedure, or technique. Generac has not
undertaken any such wide evaluation. Therefore,
people who use a method, procedure, or technique
that Generac does not specifically recommend must
first completely satisfy themselves that their safety,
the safety of the vehicle's occupants, and the prod-
uct's safety are not endangered by the method, pro-
cedure, or technique selected.
Information, illustrations, specifications, etc., con-
tained in these Installation Instructions are based on
the latest information available at the time of publi-
cation. Every effort has been expended to be sure that
such data are both accurate and current. However,
the manufacturer reserves the right to change, alter,
or otherwise improve this product at any time, with-
out prior notice.
Despite the safe design of this generator,
operating this equipment imprudently, neglecting
its maintenance, or being careless can cause
possible injury or death. Permit only responsible
and capable persons to operate or maintain this
equipment.
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 is carried out by a Generac
Authorized Service Dealer.
• The engine exhaust fumes contain carbon monox-
ide, which can be DEADLY. This dangerous gas, if
breathed in sufficient concentrations, can cause
unconsciousness or even death. This exhaust sys-
tem must be installed properly, in strict compli-
ance with applicable codes and standards.
Following installation, do nothing that might ren-
der the system unsafe or in noncompliance with
such codes and standards. The generator com-
partment 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 ven-
tilating air is critical to correct generator oper-
ation and is required to expel toxic fumes and
fuel vapors from the generator compartment.
Without sufficient cooling airflow, the
engine/generator quickly overheats, which caus-
es serious damage to the generator. Do not alter
the installation or permit even partial blockage
of ventilation provisions, as this can seriously
affect safe operation of the generator.
• When working on this equipment, remain alert at
all times. Never work on the equipment when
physically or mentally fatigued.
• Before performing any maintenance on the genera-
tor, disconnect its battery cables to prevent acci-
dental startup. First, disconnect the cable from the
battery post, indicated by a NEGATIVE, NEG, or
(–). Reconnect that cable last.
• Never use the generator or any of its parts as a
step. Stepping on the unit can stress and break
parts, and may result in dangerous operating con-
ditions from leaking exhaust gases, fuel leakage,
oil leakage, etc.
• Never insert any tool or other object through open-
ings in the generator interior, even if the unit is not
running. Seriouse injury or damage to the equip-
ment may occur.
!
!
!
!
DANGER
DANGER: For fire safety, installation of a generator into a recreational vehicle must comply
strictly with NFPA 70 (latest edition), “National Electrical Code”, Article 551, and NFPA 1192
(latest edition), “Standard for Recreational Vehicles”. In addition, installation must comply with
the manufacturer’s instructions and recommendations.
!
!

Generac®Power Systems, Inc. 17
ELECTRICAL HAZARDS
• The generator covered by this manual produces
dangerous electrical voltages that can cause fatal
electrical shock. Avoid contact with bare wires, ter-
minals, connections, etc., while the unit is running.
Ensure all appropriate covers, guards, and barri-
ers are in place before operating the generator. If
work must be done around an operating unit,
stand on an insulated, dry surface to reduce shock
hazard.
• Do not handle any kind of electrical device while
standing in water, while barefoot, or while hands
or feet are wet. DANGEROUS ELECTRICAL
SHOCK MAY RESULT.
• During installation onto the vehicle, properly
ground (bond) the generator either by solid mount-
ing to the vehicle frame or chassis, or by means of
an approved bonding conductor. DO NOT connect
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.
• If the vehicle electrical circuits can be powered by
any other source of electricity (such as, a “dockside”
power receptacle), there must be no possibility of
connecting the different power sources to the vehi-
cle’s circuits at the same time. The dockside (utility)
power source must be positively isolated from the
vehicle’s circuits whenever the generator is operat-
ing. Failure to isolate the vehicle’s circuits from the
dockside power supply when the generator is run-
ning may result in damage to the generator or in
serious injury or death to dockside (utility) power
workers due to backfeed of electrical energy.
• 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 noncon-
ducting implement, such as, a rope or board, to
free the victim from the live conductor. If the vic-
tim is unconscious, apply first aid, and get
immediate medical help.
• Never wear jewelry when working on this equip-
ment. Jewelry can conduct electricity, resulting in
electric shock, or may get caught in moving com-
ponents, causing injury.
FIRE HAZARDS
• For fire safety, the generator must be installed
and maintained properly. Installation always
must comply with applicable codes, standards,
laws, and regulations. Adhere strictly to local,
state and national electrical and building codes.
Comply with regulations the Occupational Safety
and Health Administration (OSHA) has estab-
lished. 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 installation and render the unit in noncom-
pliance with the aforementioned codes, stan-
dards, 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 there are any questions per-
taining to fire extinguishers, consult the local fire
department.
EXPLOSION HAZARDS
• Do not smoke around the generator. Wipe up any
fuel or oil spills immediately. Ensure that no com-
bustible materials are left in the generator com-
partment, or on or near the generator, as FIRE or
EXPLOSION may result. Keep the area surround-
ing the generator clean and free from debris.
• All fuel types are potentially FLAMMABLE and/or
EXPLOSIVE and should be handled with care.
Comply with all laws regulating the storage and han-
dling of fuels.
• Fuel supply lines must be properly installed, purged
and leak-tested according to applicable fuel-gas
codes, before placing this equipment into service.
There must be no possibility of fuel vapors enter-
ing the vehicle interior.
• It is required to install an approved, flexible, non-
conductive fuel line between the generator fuel con-
nection point and the rigid fuel lines.
Safety Rules
IMPACT-36 plus II Recreational Vehicle Generator

18 Generac®Power Systems, Inc.
1.1 PURPOSE AND SCOPE
OF THE MANUAL
These Installation Instructions have been prepared
especially for the purpose of familiarizing installers
and owners of the applicable equipment with the
product's installation requirements. Give serious
consideration to all information and instructions in
the manual, both for safety and for continued reliable
operation of the equipment.
Because of the different recreational vehicle models
and the variations between the models, it would be
extremely difficult, if not impractical, to provide
detailed instructions for every possible installation.
For that reason, instructions and illustrations in this
manual are general in nature. Illustrations are not
intended to serve as detailed installation blueprints.
The installation should comply strictly with all
applicable codes, standards, and regulations pertain-
ing to the installation and use of this product. If any
portion of this manual appears to be in conflict with
such codes, standards, or regulations, the applicable
codes, standards, or regulations must take prece-
dence over the manual.
1.2 SAFETY
Before handling, installing, operating, or servicing
this equipment, carefully read the “Notice to
Installer” and “Safety Rules” on Pages 18 and 19.
Comply with all safety rules to prevent death, per-
sonal injury, or damage to equipment and/or proper-
ty. Stress safety to all installers, operators, and ser-
vice technicians who work on this equipment.
1.3 STANDARDS BOOKLETS
Installation, use, and servicing of this equipment
should comply strictly with published standards, as
well as the manufacturer's recommendations. The
following standards booklets (latest revision) are
available from the sources indicated:
1. NFPA 1192, “Standard for Recreational Vehicles”
(replaces ANSI A119.2/NFPA 501C), available
from the National Fire Protection Association,
Batterymarch Park, Quincy, MA 02269.
2. NFPA 70, “NFPA Handbook of the National
Electric Code,” available same as Item 1.
3. ANSI/RVIA EGS-1, “Engine Generator Sets for
Recreational Vehicle Safety Requirements”, ava-
ialable from the Recreational Vehicle Industry
Association, 1896 Preston White Drive, Reston,
VA 22090.
4. California Administrative Code, Title 25, avail-
able from the State of California, Documents
Section, P.O. Box 1015, North Highlands,
CA 95660.
5. CSA Electrical Bulletin 946, available from the
Canadian Standards Association, Housing and
Constructions Materials Section, 178 Rexdale
Boulevard, Rexdale, Ontario, Canada, M9W 1R3.
1.4 EQUIPMENT DESCRIPTION
Instructions and information in this section pertain
to Generac Impact air-cooled generators — more
specifically, the installation of Impact-34 plus II and
IMPACT-36 plus II Recreational Vehicle Generators.
These generators are designed specifically for
installing in recreational vehicles.
1.5 ENGINE GENERATOR OPERATING
SPEED
The generators are driven by gasoline-powered, sin-
gle-cylinder engines. The engines drive revolving
fields (rotors), high frequency, permanent magnet
alternators. The generators supply 120 volts AC at 60
Hertz with DC inverter. The generators revolving
fields are driven at a variable speed depending on the
demand for power. Computers monitor that demand
and adjust the engine speed to provide adequate
power to the connected loads.
Section 1 – General Information
IMPACT-36 plus II Recreational Vehicle Generator