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16 Generac
®
Power Systems, Inc.
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.
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 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.
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 contacts (Figure 3.3) 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
3.7.3 OVERCRANK
This feature prevents the generator from damaging
itself when it continually attempts to start and anoth-
er problem, such as no fuel supply, prevents it from
starting. The unit will crank and rest for a preset time
limit. Then, it will stop cranking, and the LED on the
generator control panel will light indicating an over-
crank failure. The Auto/Off/Manual switch will need
to be set to OFF and then back to AUTO to reset the
generator control board.
NOTE:
If the fault is not repaired, the overcrank feature
will continue to activate.
3.7.3.1 Approximate Crank Cycle Times
• 15 seconds ON
• 7 seconds OFF
• 7 seconds ON
• 7 seconds OFF
• Repeat for 45 seconds
Approximately 90 seconds total
3.7.4 OVERSPEED
This feature protects the generator from damage by
shutting it down if it happens to run faster than the
preset limit. This protection also prevents the gener-
ator from supplying an output that could potentially
damage appliances connected to the generator cir-
cuit. Contact your nearest Generac/Guardian
Authorized Dealer if this failure occurs.
4.1 FUSE
The generator panel’s 15 amp fuse (Figure 4.1) 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, you cannot crank
or start the engine. You should replace the fuse using
only an identical 15-amp replacement.
The generator panel’s 5 amp fuse protects the battery
charge circuit against overload. If the fuse element has
melted open, you will not have battery charging capa-
bility. You should replace the fuse using only an identi-
cal 5 amp replacement. To remove fuse, push cap down
and rotate counterclockwise.
Oil Filter
Oil
Drain
Hose
Low Oil Switch
High Temp Switch
L
o
o
s
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Section 4 — Maintenance
Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators