Generac Power Systems 0940-1 User Manual
Manual No. A9I95
OWNER'S MANUAL
and Installation Instructions
IMPACT-34 plus with Inverter and IMPACT-36 plus with Inverter
AIR-COOLED
RECREATIONAL VEHICLE
GENERATORS
Model Nos. 0940-1, 0941-1
Revision 0 (09/24/98)
®
POWER SYSTEMS. INC.
Printed in U.S.A.
GENERAL SAFETY RULES
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.
study these SAFETY RULES carefully before operat
ing or servicing applicable equipment. Become familiar
with this Owner's Manual and with your generator.
Safe, efficient and reliable operation can only be
achieved if generator is properly installed, operated
and maintained. Many accidents are caused by failing
to follow simple and fundamental rules or precautions.
The manufacturer suggests that these GENERAL
SAFETY RULES be copied and posted in potential
hazard areas of the recreational vehicle. Safety should
be stressed to all operators and potential operators of
equipment.
The manufacturer cannot possibly anticipate every 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 proce
dure, work method or operating technique Generac
does not specifically recommend, you must satisfy
yourself that it is safe for you and others. You must
also make sure the procedure, work method or operat
ing technique that you chose does not render the gen
erator to be unsafe.
WARNING:
The engine exhaust from this product
contains chemicais known to the State
of California to cause cancer, birth
^^^defects^rothenjeproductiv^iam
A For fire safety, the recreational vehicle generator
must be properly installed and maintained.
Installation must always remain in compliance with
applicable codes and standards. In addition, the
generator must be installed in conformance to the
manufacturer's detailed installation instructions.
Following installation, nothing must be done that
might render the generator in noncompliance with
such codes, standards and instructions.
A The RV generator produces extremely high and
^ dangerous electrical voltages and can cause dan
gerous, and possibly fatal, electrical shock. Avoid
contact with bare wires, terminals, etc. while the
unit is running. If you must work around an operat
ing generator, stand on an insulated, dry surface
to reduce shock hazard.
• Never work on this equipment or handle any elec
trical device while standing in water, while bare
foot, or while hands or feet are wet. Dangerous
electrical shock will result.
• Have the generator properly grounded (bonded)
during installation onto the vehicle, 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 con
ductor to any generator part that might be
removed or disassembled during routine mainte
nance. If the grounding conductor must be
replaced, use only a flexible conductor that is of
No. 8 AWG copper wire minimum.
* •
In case of accident caused by electric shock, shut down
the source of electrical power down at once. If this can
not be done, free victim from live conductor. AVOID
DIRECT CONTACT WITH THE VICTIM. Use a dry
board, dry rope, or other non-conducting implement to
free the victim from live conductor. Apply first aid and
get medical help.
Inspect fuel system frequently for leaks or dam
age. Repair or replace any oamaged or leaking
component immediately. Never attempt to change,
alter or modify the generator fuel system in any
way that might affect safety or compliance with
applicable codes and standards.
The generator engine gives off DEADLY carbon
monoxide gas through its exhaust system. This
dangerous gas, if breathed in sufficient concentra
tions, can cause unconsciousness or even death.
This exhaust system must have been properly
installed, in strict compliance with applicable codes
and standards. Following installation, you must do
nothing that might render the system unsafe or in
non-compliance with such codes and standards.
The generator compartment must be completely
vapor sealed from vehicle interior. There must be
no possibility of exhaust fumes entering the vehi
cle interior. Never operate this equipment with a
leaking or defective exhaust system.
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, fuel leakage,
oil leakage, etc.
Do not smoke around the generator. Wipe up any
fuel and oil spills immediately. Never leave oily or
fuel soaked rags in the generator compartment or on
the generator itself. Keep the area around the gener
ator clean and free of debris.
Adequate ventilation is required to expel toxic
fumes and fuel vapors from the generator com
partment. Do not alter the installation of this equip
ment in any manner that might obstruct air and
ventilation openings. Such openings must be kept
clear and unobstructed.
Keep hands, feet, clothing, etc., away from drive
belts, fans and other moving parts of this equip
ment. Never remove any drive belt or fan guards
while the unit is operating.
Inspect the generator periodically. Repair or replace
all damaged or defective parts immediately.
These generators can be converted to use LP gas
(propane) as a fuel. Liquid Propane gas is highly
EXPLOSIVE. The gas is heavier tnan air and
tends to settle in low areas where even the slight
est spark can ignite the gas and cause an explo
sion.
Before performing any maintenance on the gener
ator set, disconnect its battery cables to prevent
accidental start up. Disconnect the cable from the
battery post indicated by a NEGATIVE, NEG or (-)
first. Reconnect that cable last.
TABLE OF CONTENTS
OPERATING INSTRUCTIONS
GENERAL SAFETY RULES...............................inside cover
IDENTIFICATION RECORD.............................................. 2-3
GENERATOR and INVERTER FEATURES
...................
2-4
READ THIS MANUAL THOROUGHLY
Operation and Maintenance.................................................................. 5
How to Obtain Service........................................................................... 5
Service Dealer Location
........................................................................
GENERATOR FAMILIARIZATION
Generator Applicability.......................................................................... 6
Safety....................................................................................................... 6
OPERATING INSTRUCTIONS
Generator Control Panel........................................................................ 7
Automatic Choke.................................................................................... 7
Before Starting the Engine
Starting.................................................................................................... 8
Stopping the Generator......................................................................... 8
Applying Loads to Generator................................................................ 8
Attention Required After Submersion
Operation in High Grass or Brush........................................................ 8
Operating Precautions.........................................................................8-9
Effects of Moisture and Dirt.................................................................. 9
Don't Overload the Generator............................................................... 9
................................................................
.................................................
7-8
ENGINE PROTECTIVE DEVICES
Automatic Low Oil Pressure Shutdown.............................................. 9
High Temperature Shutdown................................................................ 9
Overspeed............................................................................................... 9
Low Voltage............................................................................................. 9
SPECIFICATIONS
Fuel Requirements............................................................................... 10
Engine Oil Requirements
Generator Specifications..................................................................... 10
Engine Specifications.......................................................................... 10
....................................................................
10
MAINTENANCE
Checking Engine Oil Level.................................................................. 11
Change Engine Oil............................................................................... 11
Change Oil Filter.................................................................................. 11
Engine Air Cleaner...........................................................................11-12
Clean Air Intake Screen
Spark Arrestor Muffler
Engine Spark Plug.................................................................................12
Fuel Filter................................................................................................12
Inverter....................................................................................................12
Cleaning the Generator.........................................................................13
Battery................................................................................................:... 13
Service and Adjustments
Throttle Linkage Adjustment
Adjusting the Carburetor................................................................. 14
Adjusting Valve Clearance
Major Service Manual
Exercising the Generator
Out of Service Protection.................................................................... 15
Return the Unit to Service after Storage
Service Dealer Location........................................................................15
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i................................................. 14
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13-14
15
INSTALLATION INSTRUCTIONS
INSTALLATION SAFETY RULES................
.....................
16
GENERAL INSTALLATION INFORMATION
Purpose and Scope...............................................................................17
Safety......................................................................................................17
Standards Booklets...............................................................................17
Equipment Description.........................................................................17
Engine Generator Operating Speed....................................................17
LOCATION AND SUPPORT
Generator Location
Generator Support.................................................................................18
5
Suspended Mounting............................................................................18
Generator Restraint...............................................................................19
...............................................................................
18
GENERATOR COMPARTMENTS
Compartment Seams.............................................................................19
Compartment Size.................................................................................20
Compartment Construction..................................................................20
Sound Insulation Materials
Compartment Floor Cutouts
Acoustics...............................................................................................21
..................................................................
................................................................
20
21
COOLING AND VENTILATION AIR
Generator Air Flow................................................................................22
8
Cooling Air Inlet Openings...................................................................22
Compensating for Restrictions............................................................23
Inverter Location
Testing the Installation
..................................................................................
.........................................................................
23
23
GASOLINE FUEL SYSTEM
Fuel Tank...........................!....................................................................24
Generator Fuel Supply Line
.................................................................
24
PROPANE GAS FUEL SYSTEM
Parts Not Included in Fuel System......................................................25
Some Important Considerations..........................................................25
Va/tor Withdrawal..................................................................................25
Primary Regulator
Gaseous Carburetion............................................................................26
Fuel Supply Lines..................................................................................26
Excess Flow Valve................................................................................ 26
Leakage Tests........................................................................................26
.................................................................................
25
EXHAUST SYSTEM
Mufflers and Spark Arrestors...............................................................27
Type of Exhaust System.......................................................................27
Exhaust System Safety.........................................................................27
12
12
13
15
15
ELECTRICAL CONNECTIONS
Wiring......................................................................................................28
Generator AC Connection System
Conduit....................................................................................................28
Isolating Different Power Sources
Power Supply Cord
Ground Fault Circuit Interrupters......................................................29
...............................................................................
Sensing Harnesses
BATTERY INSTALLATION
OPTIONAL ACCESSORIES
POST INSTALLATION TESTS
INSTALLATION CHECK LIST
MAJOR FEATURES AND DIMENSIONS
TROUBLESHOOTING
ELECTRICAL DATA........................................
REPAIR PARTS...............................
CALIFORNIA EMISSIONS WARRANTY
WARRANTY..................................................
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35-36
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,....52 -53
back page
28
28-30
28
29 ^
31
32
33
34
37
1 —
IDENTIFICATION RECORD
Please record the following information from the generator DATA DECAL or information decal.
1. Model Number
3.kW Rating.
5. Phase
____
__________________
IMPACT-36 plus FEATURES
2.Serial Number_______________________
4. Rated Voltage.
6. Hertz
________
REFERENCE NUMBER IDENTIFICATION
1. Generator Air Intake Screen
Air Cleaner
2.
Air Intake Tube
3.
4.
Oil Dipstick and Filler Tube
5. Fuel Pump 12. Circuit Breaker
Gasoline Carburetor
6.
7. Fuel Primer Switch
8. Data Decal
9. 12 Volt Battery Connection
10. Engine Start/Stop Switch
11. Generator DC Output Leads
13.15 Amp Fuse
14. Hour Meter
2 —
IMPACT 36 plus
GASOLINE
IDENTIFICATION RECORD
Please record the following information from the generator DATA DECAL or information decal.
1.Model Number
3.kW Rating.
5. Phase
____
__________________
2.Serial Number
4. Rated Voltage.
6. Hertz
________
IMPACT-34 plus FEATURES
_______________________
Generator Air Intake Screen
1.
Air Cleaner
2.
Air Intake Tube
3.
4. LP Fuel Regulator
Oil Dipstick and Filler Tube
5.
LP Carburetor
6.
7. LP Fuel Solenoid
Fuel Primer Switch
8.
Impact-34 plus
LP VAPOR
REFERENCE NUMBER IDENTIFICATION
9. Data Decal
10.12 Volt Battery Connection
11. Engine Start/Stop Switch
12. Generator DC Output Leads
13. Circuit Breaker
14.15 Amp Fuse
15. Hour Meter
— 3 —
INVERTER FEATURES
1. Inverter
2. 9 Pin Connection
3. Customer AC Output
PART No. A6187 INVERTER
REFERENCE NUMBER IDENTIFICATION
4. 2 Pin Connection
5. DC Input
6. Cooling Fan
— 4 -
READ THIS MANUAL THOROUGHLY
If you don't understand any portion of this manual,
contact Generac for a demonstration of actual start
ing, operating and servicing procedures.
Throughout this publication and on tags and decals
affixed to the generator, DANGER, WARNING and
CAUTION blocks are used to alert you to special
instruction about a particular operation that may be
hazardous if performed incorrectly or carelessly.
Observe them carefully.
These safety warnings cannot eliminate the hazards
that they indicate. Strict compliance with the special
instructions while performing the service plus "com
mon sense" are major measures to prevent acci
dents.
The following definitions apply to DANGER WARN
ING, CAUTION and NOTE blocks found throughout
the manual.
DANGER: After this heading you can read han
dling, installing, operating or servicing instruc
tions that, if not strictly complied with, will result
in personal injury.
WARNING: After this heading you can read han
dling, installing, operating or servicing instruc
tions that, if not strictly complied with, may result
in personal injury.
CAUTION: After this heading you can read instruc
tions for handling, installing, operating or servicing
the generator that, if not strictly complied with,
could result in damage to equipment and/or proper
ty.
NOTE: After this heading you can read explanatory
statements that require special emphasis.
These symbols indicate the following:
Points out important safety information and, if
not followed, could endanger personal safety
and/or property of yourself and others.
Potential explosion hazard
Potential fire hazard
Potential electrical shock hazard
A
The operator (driver) is responsible for proper and
safe use of the vehicle, equipment on the vehicle, and
the safety of all vehicle occupants. We strongly rec
ommend that the operator read ihis Owner's Manual
and thoroughly understand all instructions before
using this equipment. We also strongly recommend
instructing other occupants in the vehicle to properly
start and operate the generator. This prepares them if
they need to operate the equipment in an emergency.
OPERATION AND MAINTENANCE
It is the operator's responsibility to perform all safety
checks, to make sure that all maintenance for safe
operation is performed promptly, and to have the
equipment checked by an Authorized Dealer periodi
cally. Normal maintenance service and replacement
of parts are the responsibility of the Owner/Operator
and, as such, are not considered defects in materials
or workmanship within the terms of the warranty.
Individual operating habits and usage contribute to
the need for maintenance service.
Proper maintenance and care of your RV generator
assures a minimum number of problems and keeps
your operating expenses at a minimum. See your
authorized Dealer/Distributor for service aids and
accessories.
HOW TO OBTAIN SERVICE
When your RV generator set requires servicing or
repairs, simply contact an Authorized Service Facility
for assistance. Service technicians are factory-
trained and are capable of handling all of your service
needs.
When contacting an Authorized Service Facility 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.
The warranty on your generator is included in this
Owner's Manual, as well as listings for repair parts.
SERVICE DEALER LOCATION
TO LOCATE THE NEAREST GENERAC SERVICING DEALER, PLEASE CALL OUR 800 NUMBER.
ONLY DEALER LOCATION INFORMATION CAN BE OBTAINED AT THIS NUMBER.
1-800-333-1322
— 5 —
GENERATOR FAMILIARIZATION
GENERATOR APPLIGVBILITY
These generators have been designed and manufac
tured 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.
DANGER: 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 manu
facturer’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 A6187). 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).
You can use this generator to supply electrical power
for operating 120 volts, single phase, 60 Hertz, elec
trical loads. These loads can require up to 3400 watts
(3.4 kW) for the Impact 34 plus, or 3600 watts (3.6
kW) for the Impact 36 plus. The maximum current at
120 volts is 28.3 amperes for the Impact 34 plus, or
30 amperes for the lmpact-36 plus.
CAUTION: Do not overload the generator. Some
installations may require that electrical loads be
alternated to avoid overloading. Applying exces
sively high electrical loads may damage the gener
ator 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 watts
of power (or amps of current) for starting than for
continuous operation.
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.
— 6 —
OPERATING INSTRUCTIONS
GENERATOR CONTROL PANEL
Mounted on the generator control panel (Figure 1) are
the following features:
Figure 1 — Typical Control Panel
FUEL PRIMER
Before starting a cold engine (if it has not been start
ed in more than two weeks), you must press this
switch to bring fuel from the tank to the fuel carbure
tor. This rocker type switch springs back into its origi
nal position when you release it.
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.
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.
CIRCUIT BREAKERS
Protects generator's AC output circuit against over
load, i.e., prevents unit from exceeding
wattage/amperage capacity.
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.
AUTOMATIC CHOKE (GASOUNE ONLY)
The engine is equipped with an automatic choke (not
shown) that consists of two main components —
choke solenoid and prechoke.
■ 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.
■ PRECHOKE (GASOLINE ONLY)
The choke system also has a temperature sensitive
metal strip that adjusts the choke valve angle accord
ing to ambient temperatures (i.e., in cofd ambient
temperatures the choke valve closes more). Once
the engine starts, an element heats the temperaturesensitive strip to a normal operating condition, open
ing the choke valve. This may take about 3 minutes
in cooler weather.
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 QUALI
FIED INSTALLATION TECHNICIAN OR INSTALLA
TION CONTRACTOR.
■ 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.
■ ENGINE LUBRICATION
Have engine crankcase properly sen/iced with recom
mended oil before starting. Refer to "Maintenance"
and "Specifications" sections for oil servicing proce
dures and recommendations.
CAUTION: Any attempt to crank or start the
engine before you have properly serviced it with
the recommended oil may result in engine failure.
FUEL SUPPLY
The engine must have adequate supply of proper fuel
to operate. Before starting, check that sufficient fuel is
available.
NOTE: On some aasoline 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.
■ COOLING AND VENTILATING AIR
Air inlet and outlet openings in the generator compart
ment must be open and unobstructed for continued
proper operation. Without sufficient cooling and venti
lating air flow, the engine-generator quickly overheats,
which causes it to automatically shutdown. Overheating
could also damage the unit or your vehicle.
_________________
— 7 —
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 vehi
cle that, if open, might permit exhaust gases to enter
the vehicle.
DANGER: The generator engine gives off deadly
carbon monoxide gas throught its exhaust system.
This dangerous gas, if breathed in sufficient con
centrations, 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) dizzi
ness, (f) headache, (g) weakness and sleepiness.
If you feel any of these symptoms, move into fresh
air immediately. If symptoms persist, get medical
help.
STARTING
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 provid
ed 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.
CAUTION; If the engine does not start after it has
been cranking for 15 seconds, release the start/stop
switch and try again. Hoiding 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 stabi
lize 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.
STOPPING THE GENERATOR
1. Turn OFF all electrical loads, using whatever means pro
vided (such as a main circuit breaker or transfer switch).
2. Let the generator run at no-load for a few minutes, to sta
bilize internal engine-generator temperatures.
3. Hold start/stop switch in its STOP position.
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.
■ LEniNG 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 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.
AHENTION 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.
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.
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.
— 8 —
The generator’s exhaust system gives off DEADLY
carbon monoxide gas. This dangerous gas, if
breathed in sufficient concentrations, can cause
unconsciousness and even death. Never operate the
generator set with the vehicle inside any garage or
other enclosed area. Never operate the generator if it
has a leaky exhaust system. Close windows in the
vicinity of the generator exhaust outlet and take any
other steps to prevent exhaust gases from entering
rooms or areas occupied by people or animals.
EFFEQS OF MOISTURE AND DIRT
Keep the generator set as clean and dry as possible.
Protect unit against excessive dust, dirt, corrosive
vapors, road splash, etc. Permitting dirt and moisture
to accumulate on generator windings will have an
adverse effect on the insulation resistance of those
windings.
When moisture is allowed to remain in contact with
windings, some of the moisture will be retained in
voids and cracks in the insulation. This causes a
reduced insulation resistance and will eventually
cause problems. Dirt will make the problem worse,
since dirt tends to hold moisture in contact with wind
ings. Salt (as from sea air) will also worsen the prob
lem since it tends to absorb moisture from the air. Salt
and moisture, when combined, form a good electrical
conductor.
DO NOT OVERLOAD
THE GENERATOR
You can read the rated wattage/amperage capacity of
your generator on the generator data decal (see
“Identification Record” on Pages 2-3).
Applying electrical loads in excess of the unit's rated
capacity will cause the engine-generator to automati
cally shutdown.
To avoid overloading, add up the wattage of all con
nected electrical lighting, appliance, tool and motor
loads. This total should not be greater than the gener
ator’s rated wattage capacity.
• Most lighting, appliance, tool and motor loads indicate
their required watts on their nameplate or data plate. For
light bulbs, simply note the wattage rating of the bulb.
• If a load does not show its rated wattage, multiply that
load’s rated VOLTS times AMPS to obtain WATTS.
• Induction type motors (such as those that run the vehicle’s
furnace fan, refrigerator, air conditioner, etc.) need about 2-
1/2 times more watts of power for starting than for running
(for a few seconds during motor starting). Be sure to allow
for this when connecting electrical loads to the generator.
First, figure the watts needed to start electric motors in the
system. To that figure, add the running wattages of other
items that will be operated by the generator.
• On a new generator do not apply heavy electrical loads
for the first two or three hours of operation.
This generator has a computer that monitors low oil pres
sure, oil ternperature, engine speed, and low voltage out
put. This section discusses those protective devices.
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 enougn fuel, check the engine
oil level.
■ INITIAL STARTUP______________________
During initial startup, a time delay built into the shut
down control aystem allows oil pressure to build. The
delay allows the engine to run for about 10 seconds
before sensing oil pressure.
■ SENSING LOW PRESSURE
If the system senses low oil pressure during opera
tion, 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.
______________
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.
ENGINE PROTECTIVE DEVICES
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.
WARNING: Do not attempt to physically adjust or
control the engine speed. Equipment damage or
A
personal injury may result.
LOW VOLTAGE
The computer monitors the voltage output of the gener
ator. If voltage sensors indicate that voltage has
dropped below a preset level, the engine will automati
cally shut down. Once the unit has shutdown, the com
puter is automatically reset when you restart the engine.
NOTE: The computer allows for the low voltage out
put that occurs during startup. A time delay that
allows the engine to start and warm up is pro
grammed into the monitoring system.
CAUTION: 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.
— 9 —
SPECIFICATIONS
FUEL REQUIREMENTS
(GASOLINE UNITS)
These generators are equipped with gasoline fuel
systems as standard equipment. Specific installa
tions 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 arrange
ment 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 substi
tute.
NOTE: Using “Unleaded” gasoline contributes to
longer engine valve life by reducing lead and carbon
deposits.
CAUTION: Generac does not recommend using
any gasoline containing alcohol, it must not con
tain 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 viiith alcohol, inspect more frequently
for fuel leaks and other abnormalities.
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, you may need to use an indepen
dent heat source 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):
LOAD GASOLINE
NO
HALF
FULL
0.13
0.20 0.52
0.40 1.05
LP
0.37
ENGINE OIL REQUIREMENTS
The recommended oils include the following:
• During summer months: SAE 30. An acceptable substi
tute 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.
GAS GENERATOR SPECIFIGVTIONS
Model
.......................................................
Rated Maximum Continuous
AC Power Output............................ 3600 watts (3.6 kW)
Rated Voltage.............................................. 120 volts AC
Rated Maximum Continuous
Current at 120 volts
Phase........................................................................ Single Phase
Rated AC Frequency.............................................. 60 Hz.
Maximum Battery
Charge Current..................................................,. 15 amps
Recommended Battery
Cranking Current..
Gross Weight................................................................... 86 lbs
................................
............................................
Impact-36 plus
30 AC amperes
400 amps
LP GENERATOR SPECIFICATIONS
Model.......................................................... Impact-34 plus
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.
Maximum Battery
Charge Current................................................................ 15 amps
Recommended Battery
Cranking Current........................................................... 400 amps
Gross Weight................................................................... 87 lbs
ENGINE SPECIFICATIONS
Type of Engine
Cooling Method................................................. Air-cooled
Displacement........................................................... 220cc
Type of Governor
Air Cleaner
Starter
...............................................
Ignition System.................................................. Solid state
Recommended Spark Plugs
Spark Plug Gap
.....................................................
..............................................
...............................................
12 volt DC electric
...........
Champion RC12YC
...............................
0.030 inch (0.8mm)
GN-220
Electronic
Paper element
10-
MAINTENANCE
This section includes information about sirtiple main
tenance 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.
CHECKING ENGINE OIL LEVEL
Check engine crankcase oil level at least every eight
hours of operation, or before each use (Figure 2).
• 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 2 — Oil Dipstick and Fill Tube
• Remove oil dipstick and fill crankcase with the recom
mended oil (See Page 10). The engine crankcase can
hold about 1 quart (950ml). DO NOT FILL ABOVE “FULL”
MARK.
• Install and tighten dipstick cap before operating engine.
CHANGE OIL FILTER
Replace the engine oil filter after the first 8 hours of
operation, every 50 operating hours thereafter.
• Turn oil filter counterclockwise to remove (Figure 3).
Figure 3 — Oil Drain Plug and Engine Oil Filter
• 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.
NOTE: See “Engine Oil Requirements” on Page 10
for recommended oils.
CHANGE ENGINE OIL
Change engine oil after the first 8 hours of operation.
Thereafter, change oil every 50 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). Drain
oil completely into a suitable container.
• When oil has drained, install and tighten drain plug.
—11 —
ENGINE AIR CLEANER
Paper Filter: Once every 25 operating hours or once
each year (whichever comes first), clean or replace
the paper filter (Figure 4). Follow the steps on page
12.
Figure 4 — 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.
CLEAN AIR INTAKE SCREEN
Clean all foreign material from the air intake screen
(Figure 5) 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 5 — Clean Air Intake Screen
Figure 6 — Setting Gap on Spark Plug
CAUTION; 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.
FUEL FILTER
Remove and replace fuel filter (Figure 7) every 100
hours of operation or once each year, whichever
occurs first.
Figure 7 — Fuel Filter
SPARK ARRESTOR MUFFLER
The spark arrestor must be maintained in effective
working order by the vehicle owner/operator.
In the State of California, the preceding is required by
law (Section 4442 of the California Public Resources
Code). Other states may have similar laws. Federal
laws apply on federal lands.
Inspect and clean the spark arrestor every 100 hours
of operation.
To remove the spark arrestor, remove the exhaust
tubing connected to the muffler and then remove the
screw that attaches the arrestor to the muffler.
Replace the cone-shaped spark arrestor if torn, perfo
rated or otherwise damaged.
ENGINE SPARK PLUG
Clean engine spark plug and set gap to 0.030 inch
(0.76mm) every 100 hours of operation (Figure 6).
Clean by scraping or wire brushing and washing with
commercial solvent. DO NOT BLAST CLEAN SPARK
PLUG.
— 12
All repairs of the inverter MUST be handled by an
authorized service dealer (see Figure 8).
Figure 8 — Inverter Warning Label
WARNING H
HIGH VOLTAGE
UNIT TO BE SERVICED ONLY
BY AN AUTHORIZED GENERAC
SERVICE DEALER.
ALLOW 2 MINUTES FOR UNIT TO
POWER DOWN BEFORE OPENING
TO REDUCE RISK OF INJURY OR
ELECTROCUTION.
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 wind
ings will be retained in voids and cracks of the wind
ings. 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.
CAUTION! Do NOT use a forceful spray of water to
clean the generator. Water will enter the generator
interior and cause problems, and may also conta
minate the generator fuel system.
BATTERY
All lead-acid storage batteries will discharge when not
in use. Inspect the generator battery as follows:
■ 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.
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.
DANGER; Storage batteries give off explosive
hydrogen gas. This can form an explosive mixture
around the battery for severai hours after charg
ing. The siightest spark can ignite the gas and
cause an explosion. Such an explosion can shat
ter the battery and cause blindness or other injury.
Any area that houses a storage battery must be
properly ventilated. Do not allow smoking, open
fiame, sparks or any spark producing tools or
equipment near the battery.
SERVICE AND ADJUSTMENTS
■ 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 tuel 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 condi
tion if you accelerate the throtile manually or any
other way.
THROTTLE LINKAGE ADJUSTMENT
If needed, you can adjust the length of the linkage rod
between the electronic governor lever arm and the
carburetor throttle lever arm. This adjustment helps to
establish the proper travel relationship between the
two lever arms. Ir this adjustment is not properly set,
the computer will NOT have control of the full range of
engine speed. If the rod adjustment is set too snort,
the computer will not have access to wide open throt
tle or “full power” conditions. If the rod adjustment is
set too long, the computer will not have access to
closed throttle or “no power” conditions.
Use the following procedure to assure the linkage rod
is properly adjusted:
1. Start the generator, then shut it down right away. As the
engine coasts to a stop, observe from above the engine
as the throttle lever on the carburetor rotates counter
clockwise.
2.There should be
between stop tab on throttle lever arm and the stop block
on the carburetor die casting (Figure 9).
Figure 9 — Gap Between Stop Tab
TOP VIEW OF
THROnUE
LEVER ARM
a gap of 0.003 inch (0.08-0.5mm)
tnrotti
and Stop Block
THROTTLE
'LEVER ARM
DANGER: Battery eiectrolyte fluid is an extremely
caustic sulfuric acid solution that can cause
severe burns. Do not permit fluid to contact eyes,
skin, ciothing, painted surfaces, etc. Wear protec
tive goggles, protective ciothing and gioves when
handiing a battery. If you spill the fluid, flush the
affected area Immediately with clear water.
DANGER; Do not use any jumper cables or boost
er battery to crank and start the generator engine.
If any battery has discharged, remove it from the
vehicle for recharging.
-13 -
MAINTAIN A MINIMUM
6AP0F0.003‘
(0.0t-0.5MM)
CAUTION: Do not overbend the spring clip or the
clip will lose its clamping force.
CAUTION: Do not overbend the spring clip or the
clip wiil lose its clamping force.
3. With pliers, lightly compress the spring clip on the carbu
retor lever arm. This allows the linkage rod to slide freely
through the clip. While the clip is compressed, rotate the
throttle lever in the appropriate direction to increase or
decrease the gap until there is 0.003 inch (0.08-0.5mm)
clearance (Figure 10).
1. Loosen the rocker arm jam nut. Use an alien wrench to
turn the pivot ball stud while checking clearance between
the rocker arm and the valve stem with a feeler gauge
(Figure 11).
Figure 11 — Adjusting Valve Clearance
Figure 10 — Adjusting Throttie Linkage
4. Release spring clip so you can secure adjustment. This
allows the carburetor and the electronic governor to be
synchronized.
Feeler
Guage
2. When valve clearance is correct, hold the pivot ball stud
with the alien wrench and tighten the rocker arm jam nut
with a crows foot. Tighten the jam nut to 65-85 inchpounds torque. After tightening the jam nut, recheck valve
clearance to make sure it did not change (Figure 12).
Figure 12 — Tightening Jam Nut
ADJUSTING THE CARBURETOR
The carburetor of your generator is preset at the facto|7. 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.
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 4 —
Tighten Jam Nut to
65-85 inch-pounds
(7-10 N-m)
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.
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.
OUT OF SERVICE PROTEQION
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.
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 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.
SERVICE DEALER LOCATION
TO LOCATE THE NEAREST GENERAC SERVICING DEALER, PLEASE CALL OUR 800 NUMBER.
ONLY DEALER LOCATION INFORMATION CAN BE OBTAINED AT THIS NUMBER.
1-800-333-1322
15 —
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