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14 Generac
®
Power Systems, Inc.
RETRANSFER AND SHUTDOWN
When utility power source voltage has been restored,
electrical loads may be transferred back to that source
and the generator can be shut down as follows:
• Verify that utility power supply voltage to the transfer
switch has been positively turned “Off,” using what-
ever means provided (such as utility main line circuit
breaker).
• Set the generator’s main circuit breaker to its “Off” or
“Open” position.
• Let the generator engine run at no-load for a few min-
utes, to stabilize internal unit temperatures.
• On the generator console, set the Auto-Off-Manual
switch to “Off”. Wait for engine to come to a com-
plete stop.
• For transfer to utility position, refer to the Owner’s
Manual of your particular transfer switch.
• Turn on the utility power supply to the transfer
switch, using whatever means provided (such as a
utility main line circuit breaker). The utility power
source now powers the loads.
AUTOMATIC OPERATION
To set the system for fully automatic operation, proceed
as follows:
• Check that load circuits are connected to the
utility power supply.
• Set the Auto/Off/Manual switch to its “Auto” position.
• Set the generator main circuit breaker to its “On” or
“Closed” position.
WEEKLY EXERCISE CYCLE
The generator will start and exercise once every 7 days.
During this weekly exercise, the unit runs for about 20
minutes and shuts down. Transfer of loads to genera-
tor output does not occur during the exercise.
To select day and time for exercising, proceed as
follows:
• Set the Auto/Off/Manual switch to OFF.
• Set generator main circuit breaker to OFF or OPEN.
• Locate the rocker switch on the control panel identi-
fied with the words “Set Exercise Time” (Figure 9).
• Push “Set Exercise Time” switch to ON position for
20 to 30 seconds and then release. Switch will spring
back into its original position when released.
• Wait 30 seconds before setting the Auto/Off/Manual
switch to “AUTO” position.
CAUTION: If you switch the Auto/Off/Manual
switch too soon, the engine may start. If engine
does start, it will shut down automatically in
about two (2) minutes.
• Set the generator main circuit breaker to its ON or
CLOSED position.
• Generator is now programmed to start and exercise
every 7 days thereafter, on day and time of day the
switch was actuated.
• Place a sign on the generator control panel and the
transfer switch, indicating the day and time the
generator will be exercising.
NOTE:
If battery terminals are disconnected or control
panel fuse is removed, the exercise timer needs to
be reset for correct automatic exercise operation.
Figure 9 - “Set Exercise” Switch
ENGINE HEATER
Your Generac standby generator comes equipped with a
block heater (Figure 10), similar to the block heaters
used in automotive applications.
Figure 10 - Engine Block Heater
Refer to applicable wiring diagram(s) and electrical schematic(s) at
back of manual for wiring connections. Customer supplies a 120V
15A Utility fed circuit for the block heater.
Section 3 — Operation
Guardian Liquid-cooled 10 kW, 15 kW, 20 kW and 25 kW Generators