Generac
®
Power Systems, Inc.
7
Section 2 – Operation
CENTURION 3500 Home Standby Generator
1.6.4 ENGINE
Type of Engine ............................GN-220, Single-cylinder
Cooling Method..................................................Air-cooled
Rated Horsepower ..................................7.8 @ 4,200 rpm
Displacement............................................................220cc
Cylinder Block ....................Aluminum w/Cast Iron Sleeve
Type of Governor ........................Mechanical, Fixed Speed
Air Cleaner ..................Paper Element w/Foam Precleaner
Starter ................................................12-volt DC Electric
Ignition System ................Solid-state w/Flywheel Magneto
Recommended Spark Plug
Champion ..........................................................RC12YC
AC ..........................................................................R45S
Fram Autolite ..............................................................65
Spark Plug Gap ..................................0.03. inch (76 mm)
Recommended Minimum
Battery ......................................235cc Amperes @ 32°F/
195cc Amperes @ 0° F
1.6.5 GENERATOR
Rated Maximum Continuous
AC Output (LP) ................................3,400 Watts (3.4kW)
Rated Voltage ................................................120 Volts AC
Rated Maximum Continuous
AC Current (LP) ........................................28.3 Amperes
Phase ......................................................................Single
Rotor RPM................................................................3,600
Number of Rotor Poles ....................................................2
Engine RPM ..............................................................3,600
Rated AC Frequency ................................................60 Hz
Battery Charge Voltage ....................................14 Volts DC
Battery Charge Current ..........................2 Amperes (max)
Length ..................................................843 mm (33.2 in.)
Width ....................................................504 mm (19.8 in.)
Height ......................................................966 mm (38 in.)
Weight ......................................................90 kg (275 lbs.)
2.1 GENERATOR CONTROL PANEL
The following features are mounted on the generator
control panel (Figure 2.1):
Figure 2.1 — Generator Control Panel
2.1.1 SHUT DOWN INDICATOR
This LED will flash a specific number of times to indi-
cate a specific failure. Shutdowns and their failure
codes follow in Section 2.9, Protection Systems. These
codes can also be referenced on the decal located on
the air filter cover, located below the control panel.
2.1.2 AUTO/OFF/MANUAL SWITCH
2.1.2.1 Auto Position
Selecting this switch position activates fully automat-
ic system operation. It also allows the user the abili-
ty to start and exercise the generator from the remote
Power Transfer Monitor.
2.1.2.2 Off Position
This switch position shuts down the engine. This
position also prevents the engine from starting.
2.1.2.3 Manual Position
Selecting this switch position will crank and start the
engine. Transfer to standby power will not occur
unless there is a utility failure.
With the switch set to AUTO, the engine may
crank and start at any time without warning.
Such automatic starting normally occurs when
utility power source voltage drops below a pre-
set level or during the normal exercise cycle. To
prevent possible injury that might be caused by
such sudden starts, always set the switch to
OFF and remove the fuse before working on or
around the generator or transfer switch. Then,
place a “Do Not Operate” tag on the generator
panel and on the transfer switch.
2.1.3 FUSE
The generator panel's 7.5 amp fuse protects the DC
control circuit against overload. The fuse is wired in
series with the battery output lead to the panel. If the
fuse element has melted open, the engine cannot
crank or start. The same fuse also protects the bat-
tery charge circuit against overload. If the fuse ele-
ment has melted open, battery charging will not be
possible. Replace the fuse using only an identical 7.5
amp fuse.
2.1.4 MAIN BREAKERS
The main breakers protect the generator’s AC output
circuit against overload and provide a method of
turning OFF the generator’s 120-volt AC output to the
Power Transfer Monitor’s outlets. The CENTURION
3500 has two (2) 15-amp breakers.
!
✧
✧
✧
15
15
PULL TO DISCONNECT
GENERATOR POWER
CONTROL CENTER
AUTO
DETAILS
OFF
SEE CHART
BELOW FOR
DOWN
INDICATOR
SHUT
MAN.
GREEN BAR INDICATES TRIP
PUSH TO RESET
GENERATOR
POWER
FUSE
7.5A
