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16 Generac
®
Power Systems, Inc.
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, and the Auto/Off/Manual switch must 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 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 will
light indicating an overcrank 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.
Figure 4.1 – Generator Control Panel
4.2 CHECKING THE ENGINE
OIL LEVEL
For oil capacities, see “Specifications,” Section 1.5
(Page 6). For engine oil recommendations, see
Section 4.3.1. To check the engine oil level, proceed
as follows (Figure 4.2):
1. Start the generator by moving the Auto/
Off/Manual switch to the MANUAL position. Allow
it to run for a short while and then shut it down
by moving the switch to the OFF position.
2. Remove the dipstick and wipe it dry with a
clean cloth.
3. Install the dipstick; then, remove it again. The oil
level should be at the dipstick “Full” mark. If nec-
essary, add oil to the “Full” mark only. DO NOT
FILL ABOVE THE “FULL” MARK.