Firman T09275 User manual

OPERATOR’S MANUAL
Record product information to reference when ordering parts or
obtaining warranty coverage.
TRI-FUEL PORTABLE GENERATOR
MODEL NUMBER
T09275
P/N:392745475 Rev:02

Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Features and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Maintenance - Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 8
Troubleshooting- Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5
Parts Diagrams - Parts Lists - Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Service - Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
REGISTER YOUR PRODUCT
INTRODUCTION
Thank you for purchasing a FIRMAN generator. You have selected a high-quality, precision engineered
generator set designed and tested to give you years of satisfactory service. This generator is Tri-Fuel
and capable of running on gasoline, liquid petroleum gas (LPG), and natural gas (NG). This generator is
not intended to be run unattended or to supply power to life safety support.
This manual contains safety information to make you aware of the hazards and risks associated
with generator products and how to avoid them. This generator is designed and intended only
for supplying electrical power for operating compatible electrical lighting, appliances, tools and
motor loads, and is not intended for any other purpose. It is important that you read and
understand these instructions thoroughly before attempting to start or operate this portable
generator. Save these original instructions for future reference.
All information in this publication is based on the latest production information available at the
time of approval for printing. The manufacturer reserves the right to change, alter or otherwise
improve the generator and this documentation at any time without prior notice.
INTRODUCTION
01
Register your product using the QR code provided or at
www.firmanpowerequipment.com .

02
SIGNAL WORDS
DANGER WARNING CAUTION
Indicates a hazard
which, if not avoided,
will result in death or
serious injury.
Indicates a hazard
which, if not avoided,
could result in death
or serious injury.
Indicates a hazard
which, if not avoided,
could result in minor or
moderate injury.
Toxic Fumes- Engine exhaust contains carbon monoxide, a
poisonous gas that will kill you in minutes. You cannot smell
it or see it.
Fire- Fuel and its vapors are extremely flammable which could
cause burns or fire resulting in death or serious injury.Engine
exhaust could cause fire resulting in death or serious injury.
Hot Surface- Muffler could cause burns resulting in serious injury.
Generator could cause electrical shock resulting in death or serious
injury.
Safety Alert Symbol- Indicates a potential personal injury hazard.
Operator's Manual- Failure to follow warnings, instructions and
operator's manual could result in death or serious injury.
English Customer Service: 1-844-FIRMAN1
NOTICE
Indicates information
considered Important,
but not hazard-related.
INTRODUCTION

English Customer Service: 1-844-FIRMAN1
WARNING! This product can expose you to chemicals including gasoline engine
exhaust, which is known to the State of California to cause cancer, and carbon
monoxide, which is known to the State of California to cause birth defects or other
reproductive harm. For more information go to www.P65Warnings.ca.gov.
This outdoor generator can be used to power outdoor items using extension cords or to restore
home power using a transfer switch. A transfer switch is a separate device installed by a licensed
electrician that allows the portable generator to be cord connected, using either of the 120/240V
receptacles, directly into your home’s electrical system. Install a listed transfer switch as soon as
possible if this generator will be used to restore power to your home.
NOTICE If you have questions about intended use, contact FIRMAN customer service. This portable
generator is designed to be used only with FIRMAN authorized parts.
The generator has a system ground that connects the generator frame components to the ground
terminals on the AC output receptacles. The system ground is connected to the AC neutral wire.
The neutral is bonded to the generator frame.
System Ground
There may be Federal or State regulations, local codes, or ordinances that apply to the intended
use of the generator. Consult a qualified electrician, electrical inspector, or the local agency
having jurisdiction. This generator is not intended to be used at a construction site or similar
activity as defined by NFPA 70-2020 (NEC) section 590.6.
Compliance Requirements
Connections to your home’s electrical system must use a listed* transfer switch installed by a
licensed electrician. The connection must isolate the generator power from the utility power and
comply with all applicable laws and electrical codes.
ToRestoreHomePowerUsingaListedTransferSwitch
Typical
120/240V
Outlet
Transfer
Switch
Typical Indoor Items
To Restore Power Using Extension Cords
03
INTRODUCTION

English Customer Service: 1-844-FIRMAN1
1. Only use grounded cords marked for outdoor use rated for your loads.
16
14
To provide power using
extension cords
Total
Amperage
Minimum Gauge, Outdoor Rated
Up to 50 FT (15m)
Up to 13A
Up to 15A
Up to 20A
Up to 30A
Up to 50A
2. Follow cord safety instructions.
3. Install carbon monoxide alarm(s).
4. When operating portable generator with extension cords, make sure portable generator is located
downwind in an open, outdoor area, at least 20 ft. (6 m.) from occupied spaces with exhaust pointed
away.
5. Extension cords running directly into your home, powering indoor items IS NOT RECOMMENDED.
Extension cords running directly into the home increase your risk of carbon monoxide
poisoning through any openings.
If an extension cord running directly into your home is used to power indoor items, the
operator recognizes that this increases the risk of CO poisoning to people inside the home
and assumes that risk.
6. Install a listed *transfer switch as soon as possible if this or any generator will be used to restore
power to your home.
*Certified by a Nationally Recognized Testing Laboratory that the product complies to appropriate
product safety test standards.
DANGER! Engine exhaust contains carbon monoxide, a poisonous gas that will kill
you in minutes. You cannot smell it, see it, or taste it. Even if you do not smell exhaust
fumes, you could still be exposed to carbon monoxide gas.
04
6
INTRODUCTION

1- Fuel Gauge
2- 9.0 Gallon Capacity Fuel Tank
3- Fuel Cap
4- Choke Lever(behind air filter box)
5- Air Filter
6- 459cc FIRMAN OHV Engine
7- Recoil Starter
8- 11.0" Flat Free Wheel
9- Oil Filler Cap
10- Battery
11- Outlet Cover
12- Control Panel
13- Handle
14- Data Decal / Serial Number
15- LPG/NG Selector Switch
English Customer Service: 1-844-FIRMAN1
*We are always working to improve our products. Therefore, the enclosed product may differ
slightly from the image on this page.
05
FEATURES AND CONTROLS
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FEATURES AND CONTROLS
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FEATURES AND CONTROLS
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FEATURES AND CONTROLS
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English Customer Service: 1-844-FIRMAN1
NOTICETotal power drawn from all receptacles must not exceed the data decal rating.
Control Panel
34
2
1
11
5
67
8
9
10
2. Main Fuel Selector Switch/Engine Switch – Use to select and turn on gasoline (GAS) or LPG/NG
fuel source. The GAS valve is closed when the switch is in the OFF or LPG/NG positions. Engine
switch is on when the switch is in GAS or LPG/NG positions.
5. Indicator Light – When the main fuel selector switch is turned to the GAS or LPG/NG position,
the indicator light will turn RED for up to 4 minutes (before going off). Starting the engine
successfully anytime during the 4 minutes will turn the indicator light GREEN. See Indicator
light-Battery Power Saving Mode section for more information.
6. Circuit Breakers – The receptacles are protected by AC circuit protectors. If the generator is
overloaded or an external short circuit occurs, a circuit protector may trip. If tripping occurs,
disconnect all electrical loads and determine the cause before attempting to continue using the
generator. Reset any tripped circuit protectors.
If multiple receptacles are used at the same time, the total current must be kept with-in the
portable generator data decal rating.
7. 120V, 20A Duplex GFCI (Ground Fault Circuit Interrupter)- NEMA 5-20R
A maximum of 20 Amps current may be drawn from this duplex receptacle.
8. 120V, 30A Twist Lock – NEMA L5-30R(Not GFCI protected)
A maximum of 30 Amps current may be drawn from this receptacle.
9. 120/240V, 30A Twist Lock – NEMA L14-30R(Not GFCI protected)
10. 120/240V, 50A – (NEMA 14-50R) (Not GFCI protected)
3. Engine Start Switch – To start engine, press and hold the switch in the START (ll) position, the
engine will crank and attempt to start. When the engine starts, release the switch to the RUN (l) position.
09
FEATURES AND CONTROLS
A maximum of 30 Amps current for 240 Volts or two independent 120 Volt loads at 30 Amps current each.
A maximum of 38.33 Amps current for 240 Volts or two independent 120 Volt loads at 38.33 Amps current each.
12. CO Alert™ Carbon Monoxide (CO) Shutdown Indicator Light — Indicates the engine shutdown due
to carbon monoxide accumulation around the generator or a CO Alert system fault occurred.
6
12
1. LPG/NG Hose Connector (Inlet: 3/8" Flare Male) – Used to connect LPG/NG hose to generator.
4. 3-1 Data-Minder (Multi-Meter) – Push the SELECT button to show the Voltage, Hertz and running hours.
11. Ground Terminal – Consult an electrician or authority having jurisdiction for local grounding
requirements.
6

English Customer Service: 1-844-FIRMAN1
OPERATION
1. Location
DANGER! Engine exhaust contains carbon monoxide, a poisonous gas that could kill
you in minutes. You CANNOT smell it, see it, or taste it. Even if you do not smell exhaust
fumes, you could still be exposed to carbon monoxide gas.
Install battery-operated carbon monoxide alarms or plug-in carbon monoxide alarms with
battery back-up according to the manufacturer's instructions. Smoke alarms cannot detect
carbon monoxide gas.
Do not run this portable generator inside homes, garages, basements, crawlspaces, sheds, or
other partially-enclosed spaces even if using fans or opening doors and windows for ventilation.
Carbon monoxide can quickly build up in these spaces and can linger for hours, even after this
product has shut off.
If you start to feel sick, dizzy, weak or your home’s carbon monoxide alarm sounds, get to fresh air
right away. Call emergency services. You may have carbon monoxide poisoning.
Carbon Monoxide Alarm(s)
Install carbon monoxide alarms
inside your home. Without
work ing carb on mo noxid e
alarms, you will not realize you
are getting sick and dying from
carbon monoxide poisoning.
20 ft. (6 m) min.
To better educate yourself about all carbon monoxide risks,
go to www.takeyourgeneratoroutside.com.
10
Operate portable generator only outdoors and downwind at least 20 ft.(6 m) from occupied
spaces with exhaust pointed away to reduce the risk of carbon monoxide accumulating.
Prevent Carbon Monoxide (CO) Poisoning
Use outdoors and downwind at least 20 ft. (6 m) from any home.
Point exhaust away from all homes and occupied spaces.
Install CO alarms inside your home.

English Customer Service: 1-844-FIRMAN1
Reduce Risk of Fire
WARNING! Exhaust heat/gases could ignite combustibles, structures or damage fuel
tank causing a fire, resulting in death or serious injury.
Keep portable generator at least 5 ft. (1.5m) from any structure, trees or vegetation over 12
in. (30 cm) in height.
Select an outdoor site that is dry and protected from the weather. Do not move portable
generator indoors to protect it from the weather.
Do not locate the portable generator under a deck or other similar structure that may
confine heat and airflow.
5 ft.(1.5m)
min.
5 ft.(1.5m)
min.
20 ft.(6m)min.
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OPERATION

English Customer Service: 1-844-FIRMAN1
2, Oil and Gasoline / LPG/ NG
Add Engine Oil
Degrees Celsiusº(Outside)
Full Synthetic 5W-30
Degrees Fahrenheitº(Outside)
5W-30 10W-40
10W-30
1.Place generator on a flat, level surface.
2.Clean area around oil fill and remove yellow oil fill cap/dipstick.
3.Wipe dipstick clean.
(H)
DRAIN PLUG
(L)
H
L
12
OPERATION
We recommend using SAE 10W-30 API SL or higher oil for best performance. Do not use special
additives. Ambient temperature determines the proper oil viscosity for the engine. Use the chart
to select the proper oil for the outdoor temperature range expected.
NOTICE Do not attempt to crank or start the engine before it has been properly filled with the
recommended type and amount of oil. Damage due to operation with no oil will void your warranty.

English Customer Service: 1-844-FIRMAN1
4. Using oil funnel, slowly pour contents of provided oil bottle into oil fill opening until oil reaches
upper limit "H" mark on the dipstick. Be careful not to overfill. Overfilling could cause engine
starting problems or engine damage.
5.Replace oil fill cap/dipstick and fully tighten.
6.Oil level should be checked prior to each use or at least every 8 hours of operation. Keep oil
level maintained.
The portable generator is equipped with a low oil shutdown. If the oil level drops below the
minimum required level, a sensor will activate an internal switch stopping the engine. If the
engine shuts off and the oil level is within specifications, check to see if generator is sitting at an
angle. Place portable generator on an even surface to correct this. If engine fails to start, the oil
level may not be high enough to deactivate the internal low oil level switch. Make sure the sump is
completely full of oil to the upper limit (H). Do not operate engine until oil level issue is corrected.
Contact Firman customer service.
Low Oil Shutdown
Add Gasoline
WARNING! Fuel and its vapors are extremely flammable which could cause burns or fire
resulting in death or serious injury.
Turn generator engine OFF and let it cool at least 2 minutes before removing fuel cap.
Do Not refuel or move generator when engine is running.
Move generator outdoors prior to adding or draining fuel
Keep fuel away from any ignition sources.
Do not overfill tank, allow space for fuel expansion.
If any fuel spills, wait until it evaporates before starting engine
Check and replace fuel lines, tank, cap, and fittings prior to each use if any damage or leaks
are found.
Fuel must meet these requirements:
Clean, fresh, unleaded gasoline with a minimum of 87 octane.
For high altitude use, see Operation at High Altitude.
Gasoline with no more than 10% ethanol is acceptable. E10 E15
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OPERATION

English Customer Service: 1-844-FIRMAN1
NOTICE Do not mix oil in gasoline or modify engine to run on alternate fuels not described in this
manual. Use of unapproved fuels could damage engine and will not be covered under warranty.
1. Clean area around fuel fill cap, remove cap.
2. Slowly add unleaded fuel to fuel tank. Be careful not to fill above the RED fuel level indicator.
This allows adequate space for fuel expansion.
Red Line Indicator
3. Install fuel cap and let any spilled fuel evaporate before starting engine.
Operation at High Altitude
At altitudes over 5,000 feet(1524 meters), a minimum 85 octane gasoline is acceptable.
Engine power and generator output will be reduced approximately 3.5% for every 1000 feet (305 m)
of elevation above sea level. High altitude may cause hard starting, increased fuel consumption
and sparkplug fouling. To operate at high altitudes FIRMAN can provide a high altitude carburetor
main jet. The alternative main jet and installation instructions can be obtained by contacting
Customer Support.
NOTICE Operation using an alternative main jet at elevations lower than the recommended
minimum altitude can damage the engine. For operation at lower elevations, the standard main
jet supplied must be used. Operating the engine with the wrong main jet may increase exhaust
emissions, fuel consumption and reduce performance.
Altitude main jet 1
Altitude main jet 2
459cc
393717004
393717005
Altitude
3000-6000Feet
6000-8000Feet
Operation at High Ambient conditions
Your Firman Power Equipment product is designed and rated for continuous operation at ambient
temperatures up to 104°F (40°C). The generator may be operated at temperatures ranging from
5°F(-15°C) to 122°F(50°C) for short periods. If the generator is exposed to temperatures outside
this range during storage, the generator should be brought back within this range before
op eration. When operated above 77°F (25°C) there may be a decrease in power.
Maximum wattage and current are subject to and limited by such factors as ambient temperature,
altitude, engine conditions etc.
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OPERATION

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Connecting LPG/ NG Fuel
WARNING! Liquid Petroleum gas (LPG) and Natural Gas (NG) are extremely
flammable which could cause burns or fire resulting in death or serious injury.
Do not place the LPG/NG sources in the path of muffler outlet or near any ignition source.
Keep a fire extinguisher near the generator all the time.
Do not use or store LPG/NG portable sources not in use near generator or in a building, garage
or enclosed area.
All LPG/NG supply/ piping lines must be installed by a qualified plumber.
If you smell gas, close off all gas sources and contact a qualified plumber to inspect and
repair the LPG or NG system.
Prior to each days first use spray a soapy water solution on LPG/NG fuel connections to check
for leaks.
Never use a gas container, LPG/ NG connector hose, LPG cylinder or NG source that appears
to be damaged.
Do not connect or disconnect the LPG/ NG source in an enclosed area.
LPG is heavier than air and can accumulate in confined / low spaces if there is a leak.
NOTICE If a fuel supply connection is necessary it must be installed in accordance with all local
codes or regulations, or in the absence of local codes or regulations, in accordance with the
National Fuel Gas Code (NFPA 54/ANSI Z223.1) and CSA B149.1 (Natural Gas and Propane
Installation Code), as applicable. If possible the fuel supply connection should be close to the
outdoor operating location. This will reduce the cost of the flexible fuel run. An approved flexible
fuel line must be installed between the generator LPG/NG Hose Connector (Inlet) and the fuel
supply connection. In no case should this information be interpreted to conflict with any local,
state, or national code. If in doubt, always follow local codes.
LPG
Always keep the LPG cylinder in an upright position.
Use only DOT LPG cylinders in vapor service with type 1, right hand ACME threads. Verify the
re-qualification date on the cylinder has not expired.
All new cylinders must be purged of air and moisture prior to filling. The purging process
should be done by your propane gas supplier.
Attach the LPG regulator hose assembly (included) to the LPG hose connector (inlet) on the control
panel of the generator. Tighten the nut with a 19 mm or adjustable wrench. Remove the safety plug
or cap from the LPG cylinder valve. Attach the LPG regulator to the cylinder valve. Do not use a
wrench to tighten LPG cylinder nut. Tighten the nut by hand clockwise to a positive stop. Using a
wrench may damage LPG cylinder components.
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OPERATION
The fuel supply line must always be shut off when the engine is not running. Failure to shut
off fuel may allow fuel to leak at the generator.

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NG Shut Off Valve
Connect the locally approved flexible fuel supply line (not included) to the LPG/NG connector (inlet)
on the control panel and the fuel Source. We recommend you use FIRMAN 25ft (7.62m) Quick Connect
Hose Kit (Model 1815) or 10ft (3m) Quick Connect Hose Kit (Model 1805) for Natural Gas (NG)
connection (This item is not included). Hose requirements may vary in different regions depending on
local codes. Contact your local licensed plumber to ensure complete compliance with all codes. Make
sure the NG source location and hose used allows the portable generator to be located at least 20ft (6m)
from any occupied spaces.
3. Starting the Generator on Gasoline
16
Indicator light - Battery Power Saving Mode
This generator is equipped with an electronic module which consumes battery power. When the
main fuel selector switch is turned to the GAS or LPG/NG position, the indicator light will turn
RED for up to 4 minutes (before going off). Starting the engine successfully anytime during the 4
minutes will turn the indicator light GREEN. If portable generator is not started during this
4-minute period the portable generator will switch to Battery Power Saving Mode to conserve
battery life.
NOTICE Your portable generator is equipped with an internal battery charger that will properly
charge the battery only when the engine is running.
The generator cannot be started in Battery Power Saving Mode. Turn main fuel selector switch to
the off position and back to the GAS or LPG/NG position to reset the RED indicator 4-minute
electronic module.
3. If connected make sure the LPG cylinder knob or the NG source valve are fully closed or
disconnected.
CLOSE
OPERATION
1. Before starting the generator, check for loose or missing parts and for any damage which may
have occurred during shipment. Ensure spark plug, muffler, fuel cap, and air cleaner are all in place.
2. Move portable generator outdoors to safe operating location downwind and at least 20 feet from
any occupied spaces.

English Customer Service: 1-844-FIRMAN1
17
4. Turn the main fuel selector switch to “GAS” position.
NOTICE When the main fuel selector switch is turned to the GAS position, the indicator light will
turn RED for up to 4 minutes (before going off). Starting the engine successfully anytime during
the 4 minutes will turn the indicator light GREEN. See Indicator light-Battery Power Saving
Mode section for more information.
5. Disconnect all electrical loads from the generator. Never start or stop the generator with
electrical devices plugged in.
6. Move choke lever located on engine to “START” position. You do not need to choke a warm engine.
(For electric start move to step (8))
7. For recoil start only - Pull the starter cord slowly until resistance is felt and then pull rapidly to
start engine.
8. For electric start only - Flip the engine switch to the START (ll) position for a few seconds and
then release.
3 sec.
OPERATION

English Customer Service: 1-844-FIRMAN1
9. Do not over-choke. As soon as engine starts and warms up, slowly move the choke lever to the
RUN position.
10. Allow portable generator to run at no load for a few minutes to stabilize before plugging in
any electrical devices.
NOTICE If engine starts but fails to run, or if portable generator shuts down during operation,
check oil level. See Low Oil Shutdown section for more information.
4. Starting the Generator on LPG
1. Before starting the generator, check for loose or missing parts and for any damage which may
have occurred during shipment. Ensure spark plug, muffler, fuel cap, and air cleaner are all in place.
2. Move portable generator outdoors to safe operating location downwind and at least 20 feet from
any occupied spaces.
3. Connect the LPG hose with regulator to both LPG cylinder and portable generator LPG/NG Hose
Connector (inlet).
LPG
4. Fully open the LPG cylinder knob.
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OPERATION

English Customer Service: 1-844-FIRMAN1
5. Turn the LPG/NG selector switch to LPG position.
6. Turn the main fuel selector switch to LPG/NG position.
NOTICE When the main fuel selector switch is turned to the LPG/NG position, the indicator light
will turn RED for up to 4 minutes (before going off). Starting the engine successfully anytime
during the 4 minutes will turn the indicator light GREEN.
See Indicator light-Battery Power Saving Mode section for more information.
7. Disconnect all electrical loads from the generator. Never start or stop the generator with
electrical devices plugged in.
8. Move choke lever located on engine to “START” position.
(For electric start move to step (12))
9. For recoil start only - PULL-TO-PRIME Pull the starter cord 1-2 times. Pull slowly until resistance
if felt and then pull rapidly.
1-2 Times
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OPERATION