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Power Systems, Inc. 3
• Before performing any maintenance on the generator,
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.
• Never use the generator or any of its parts as a step.
Stepping on the unit can stress and break parts, and
may result in dangerous operating conditions from
leaking exhaust gases, fuel leakage, oil leakage, etc.
ELECTRICAL HAZARDS
• All generators covered by this manual produce
dangerous electrical voltages and can cause fatal
electrical shock. Utility power delivers extremely high
and dangerous voltages to the transfer switch as well
as the standby generator. Avoid contact with bare
wires, terminals, connections, etc., on the generator
as well as the transfer switch, if applicable. Ensure
all appropriate covers, guards and barriers 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.
• If people must stand on metal or concrete while
installing, operating, servicing, adjusting or repairing
this equipment, place insulative mats over a dry
wooden platform. Work on the equipment only while
standing on such insulative mats.
• The National Electrical Code (NEC), Article 250
requires the frame and external electrically
conductive parts of the generator to be connected to
an approved earth ground and/or grounding rods.
This grounding will help prevent dangerous electrical
shock that might be caused by a ground fault
condition in the generator set or by static electricity.
Never disconnect the ground wire.
• Wire gauge sizes of electrical wiring, cables and cord
sets must be adequate to handle the maximum
electrical current (ampacity) to which they will be
subjected.
• Before installing or servicing this (and related)
equipment, make sure that all power voltage supplies
are positively turned off at their source. Failure to do
so will result in hazardous and possibly fatal
electrical shock.
• Connecting this unit to an electrical system normally
supplied by an electric utility shall be by means of a
transfer switch so as to isolate the generator electric
system from the electric utility distribution system
when the generator is operating. Failure to isolate the
two electric system power sources from each other by
such means will result in damage to the generator
and may also result in injury or death to utility power
workers due to backfeed of electrical energy.
• Generators installed with an automatic transfer
switch will crank and start automatically when
normal (UTILITY) source voltage is removed or is
below an acceptable preset level. To prevent such
automatic start-up and possible injury to personnel,
disable the generator’s automatic start circuit
(battery cables, etc.) before working on or around the
unit. Then, place a “Do Not Operate” tag on the
generator control panel and on the transfer switch.
• In case of accident caused by electric shock,
immediately shut down the source of electrical power.
If this is not possible, attempt to free the victim from
the live conductor. AVOID DIRECT CONTACT WITH
THE VICTIM. Use a nonconducting implement, such
as a dry rope or board, to free the victim from the live
conductor. If the victim is unconscious, apply first aid
and get immediate medical help.
• Never wear jewelry when working on this equipment.
Jewelry can conduct electricity resulting in electric
shock, or may get caught in moving components
causing injury.
FIRE HAZARDS
• Keep a fire extinguisher near the generator at all
times. Do NOT use any carbon tetra-chloride type
extinguisher. Its fumes are toxic, and the liquid can
deteriorate wiring insulation. Keep the extinguisher
properly charged and be familiar with its use.
Consult the local fire department for any questions
pertaining to fire extinguishers.
EXPLOSION HAZARDS
• Provide adequate ventilation around the generator to
prevent build-up of explosive gas.
• Do not smoke around the generator. Wipe up any fuel
or oil spills immediately. Ensure that no combustible
materials are left in the generator compartment, or
on or near the generator, as FIRE or EXPLOSION
may result. Keep the area surrounding the generator
clean and free from debris.
• Generac generator sets may operate using one of
several types of fuels. All fuel types are potentially
FLAMMABLE and/or EXPLOSIVE and should be
handled with care. Comply with all laws regulating
the storage and handling of fuels. Inspect the unit’s
fuel system frequently and correct any leaks
immediately. Fuel supply lines must be properly
installed, purged and leak tested according to
applicable fuel-gas codes before placing this
equipment into service.
• Gases such as natural gas and liquid propane (LP)
gas are extremely EXPLOSIVE. Natural gas is lighter
than air, and LP gas is heavier than air; install leak
detectors accordingly.
Important Safety Instructions
Centurion Liquid-cooled 15 kW and 25 kW Generators