10 Generac
®
Power Systems, Inc.
Section 2 – Operation
CENTURION 3500 Home Standby Generator
4. The engine will crank and attempt to start for
approximately 15 seconds. Due to the air that will
be in the fuel lines, the engine may not start dur-
ing the first 15 second cranking cycle. If the
engine does not start during the first crank cycle,
it will rest for approximately 15 seconds and then
attempt to start again. The complete starting
cycle is as follows:
• 15 seconds ON
• 15 seconds OFF
• 7 seconds ON
• 7 seconds OFF
• Repeat for 45 seconds, Approximately 90 sec-
onds total. The engine should start during the
first or second attempt.
5. If the unit does not start during this crank cycle,
verify that all fuel connections are tight and that
the tank valves are open. Turn the
AUTO/OFF/MANUAL switch to the OFF position,
wait 3-5 seconds, then repeat steps 3-4.
6. If the engine does not start after repeating steps
3-4, contact the nearest Generac Authorized
Service Dealer for assistance.
2.5.2 CHECKING AUTOMATIC OPERATION
To check the system for proper automatic operation,
proceed as follows:
1. Set the generator's main circuit breakers to their
OFF or OPEN positions by pulling the reset but-
tons outward. A visible GREEN stripe should
appear.
2. Check that the AUTO/OFF/MANUAL switch is set
to OFF.
3. Turn ON the utility power supply to the Power
Transfer Monitor by plugging the 6-foot sensing
cord into a standard household outlet.
4. Set the generator's main circuit breakers to their
ON or CLOSED position by pressing in the reset
buttons.
5. Set the AUTO/OFF/MANUAL switch to AUTO, the
system is now ready for automatic operation.
6. Turn off the utility power supply to the Power
Transfer Monitor by unplugging it’s 6-foot power
cord from the household outlet.
Once the Power Transfer Monitor senses the utility
source power is turned OFF, and after an approxi-
mate five second delay, the engine should crank and
start. After starting, the Power Transfer Monitor
should connect load circuits to the standby or gener-
ator side. Both sets of GFCI outlets on the Power
Transfer Monitor should have power. Confirm trans-
fer of power by depressing the test buttons on both
GFCI outlets. Each one should trip and the indicator
will illuminate.
With the generator running and power is available to
the GFCI outlets, turn the utility power supply ON
once again by plugging the six foot power cord into a
standard household outlet. The following should
occur.
• The Power Transfer Monitor should sense the
return of utility power and transfer the loads
plugged into the SWITCHED GFCI back to the util-
ity source. Any loads connected to the STANDBY
GFCI will remain powered by the generator until it
shuts down. In the event of a real outage, these
loads would be reconnected to the utility.
• About two minutes after re-transfer, the engine
should shut down. However, if the engine was not
run for it's minimum run time based on starting
time, it may run for a longer period of time before
shutting down. (20 minutes max.)
• The minimum run time is pre-programmed into
the generator micro processor and is provided to
ensure that the starting battery is fully charged
before the engine shuts down. The minimum run
time is based on the time it takes for the engine to
crank and start. For every one second of cranking,
the generator will run for 1.5 minutes.
2.6 STOPPING THE GENERATOR
1. Turn OFF all electrical loads using the means
provided (such as the generator fs main circuit
breakers).
2. Let generator run at no-load for a few minutes, to
stabilize internal engine generator temperatures.
3. Place the AUTO/OFF/MANUAL switch in its OFF
position.
2.7 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.
2.8 DO NOT OVERLOAD THE
GENERATOR
Read the rated wattage/amperage capacity of the gen-
erator in GENERATOR data, (see Section 1.6.5).
Applying electrical loads in excess of the unit’s rated
capacity will cause the engine/generator to automati-
cally shut down.
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 gen-
erator’s rated wattage capacity.
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