Generac Power Systems 004812-0, Owner'S Manual, Page: 14 / 94

12 Generac ® Power Systems, Inc.
Section 3 – Operation
Generac Standby Generator Sets
3.1 GENERATOR CONTROL AND
OPERATION
Refer to the appropriate control panel operator’s
manual for this unit.
3.2 OPERATING UNIT WITH MANUAL
TRANSFER SWITCH
If your generator was installed in conjunction with a
transfer switch capable of manual operation only, the
following procedure applies. A manually operated
transfer switch is one that will not provide automatic
start-up and does not include an intelligence circuit.
3.2.1 ENGINE START-UP AND TRANSFER
For additional information, refer to the applicable
control panel manual for this unit, as well as any lit-
erature pertaining to your specific transfer switch.
The Maintenance Disconnect Switch and the
Auto/Off/Manual switches (if so equipped)
must be set properly, or the generator will
crank and start as soon as the utility power to
the transfer switch is turned off. Refer to appli-
cable control panel and transfer switch manuals
for more information.
Do not proceed until certain that utility source
voltage is available to the transfer switch and
the transfer switch main contacts are set to
“Utility.”
Do not attempt manual operation until all
power supplies to the transfer switch have
been positively turned off, or extremely dan-
gerous — possibly lethal — electrical shock
will result.
Transfer switch enclosure doors should be kept
closed and locked. Only authorized personnel
should be allowed access to the transfer switch
interior. Extremely high and dangerous volt-
ages are present in the transfer switch.
In order to transfer load from the utility source to the
generator, follow these directions:
• Turn OFF or disconnect the utility power circuit to
the transfer switch, using the means provided
(such as the utility source main line circuit break-
er).
• Set the transfer handle to its “Utility” (normal)
position with load circuits connected to the utility
power supply.
• Set the standby generator’s main line circuit break-
er to its OFF (or open) position.
• Start the generator.
Do not crank the engine continuously for
longer than 30 seconds, or the heat may
damage the starter motor.
• Let engine stabilize and warm up.
• Check all applicable instrument and gauge read-
ings. When certain that all readings are correct,
move the transfer switch manual handle to its
“Standby” (generator) position, i.e., load circuits
supplied by the generator.
• Set the standby generator’s main line circuit break-
er to its ON (or closed) position.
• Load circuits are now powered by the standby
generator.
3.2.2 RETRANSFER AND SHUTDOWN
For additional information, refer to the applicable
control panel manual for this unit, as well as any lit-
erature pertaining to your specific transfer switch.
To transfer the load back to the utility power source
and shut down the generator, follow these directions:
• Set the standby generator’s main line circuit break-
er to its OFF (or open) position.
• Manually move the transfer switch handle to its
“Utility” (normal) position, i.e., load circuits con-
nected to the utility.
• Turn ON the utility power supply to the transfer
switch, using the means provided (such as the util-
ity power source main line circuit breaker).
• Let the generator run at no-load for a few minutes
to stabilize internal temperatures.
• Shut down the generator.
3.3 OPERATING UNIT WITH
AUTOMATIC TRANSFER SWITCH
If your generator has been installed along with an
automatic transfer switch, such as a Generac GTS-
type switch, the engine may be started and stopped
automatically or manually.
NOTE:
Refer to the applicable manual for your transfer
switch and to “Transfer Switch Start Signal
Connections” (Page 13). In addition, please note
the dangers under “Engine Start-up and Transfer.”
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DANGER
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