Generac
®
Power Systems, Inc. 15
3.5.2
TRANSFER BACK TO UTILITY POWER
SOURCE
When utility power has been restored, you will want
to transfer back to that source and shut down the
generator. This can be accomplished as follows:
1. Set the generator’s main circuit breaker to its
OFF (or open) position.
2. Let the engine run for a minute or two at no-load
to stabilize the internal temperatures.
3. Set the generator’s Auto/Off/Manual switch to
its OFF (or open) position. The engine should
shut down.
4. Check that utility power supply to the transfer
switch is turned OFF.
Do not attempt to activate the transfer switch
manually until all power voltage supplies
to the switch have been positively turned off.
Failure to turn off all power voltage supplies
may result in extremely hazardous and possibly
fatal electrical shock.
5. Use the manual transfer handle inside the trans-
fer switch to move the main contacts back to their
“Utility” position, i.e., loads connected to the util-
ity power source (Figure 3.2 on page 14).
6. Turn ON the utility power supply to the transfer
switch using the means provided.
7. Set the system to automatic operation as outlined
in “Automatic Transfer Operation,” Section 3.3
(Page 13).
3.6
SETTING THE EXERCISE TIMER
Your generator is equipped with an exercise timer.
Once it is set, the generator will start and exercise
once every seven days, on the day of the week and at
the time of day you complete the following sequence.
During this exercise period, the unit runs for approx-
imately 12 minutes and then shuts down. Transfer of
loads to the generator output does not occur during
the exercise cycle.
A switch on the control panel (see Figure 3.1, Page
13) allows you to select the day and time for system
exercise. To select the desired day and time of day,
you must perform the following sequence at that
time.
1. Verify that the Auto/Off/Manual switch is set
to AUTO.
2. Hold down the “Set Exercise Time Switch” until
the generator starts (approximately 10 seconds)
and then release. During this time all the red
LEDs on the control panel will flash to indicate
board is resetting itself.
3. The generator will start and run for approximately
12 minutes and then shut down on its own. The
exerciser will then be set to run at that time of day
every week.
NOTE:
The exerciser will only work in the AUTO mode
and will not work correctly unless this procedure
is performed. The exerciser will need to be reset
every time the 12-volt battery is disconnected and
then reconnected. The exerciser WILL NOT work
if dip switch 2 on the controller printed circuit
board (“Remote Not Auto”) is ON.
If the exerciser is not set using the “Set Exercise
Time Switch”, the generator will automatically
exercise 7 days after the battery connection was
made.
3.7
PROTECTION SYSTEMS
3.7.1
LOW OIL PRESSURE SWITCH
This switch (Figure 3.3) has normally closed contacts
that are held open by engine oil pressure during crank-
ing and operating. Should oil pressure drop below the
8 psi range, switch contacts close, and the engine
shuts down. The unit should not be restarted until oil
is added. The Auto/Off/Manual switch must then be
turned to OFF and then back to AUTO.
3.7.2
HIGH TEMPERATURE SWITCH
This switch’s (Figure 3.3) contacts close if the tem-
perature should exceed approximately 140º C (284º
F), initiating an engine shutdown. Your generator will
automatically restart and the LED on the generator
control panel will reset once the temperature has
returned to a safe operating level.
Figure 3.3 – Low Oil Pressure and
High Temperature Switches
Oil Filter
Oil
Drain
Hose
Low Oil Switch
High Temp Switch
Loose
n
DANGER
Section 3 — Operation
Air-cooled 8.5 kW Generator
