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14 Generac
®
Power Systems, Inc.
Section 3 — Operation
Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators
NOTE:
The access panel on top of the control panel must
be removed to adjust the voltage regulator.
NOTE:
The voltage regulator is housed above the genera-
tor's control panel. The regulator maintains a volt-
age in direct proportion to frequency at a 2-to-1
ratio. For example, at 62 Hertz, line-to-neutral
voltage will be 124 volts.
3.1 BREAK-IN PROCEDURE
Once the unit has been installed and all electrical
checks have been made, it is strongly recommended
that the following “Break-in Procedure” be completed
to ensure correct generator operation in the future.
1. Set the generator’s AUTO/OFF/MANUAL switch to
AUTO.
2. Turn OFF the utility power supply to the transfer
switch using the means provided (such as a utili-
ty main line circuit breaker).
3. The unit will start, and the transfer switch will
transfer to standby.
4. Using the transfer switch’s built-in emergency
load center, turn on circuits to load the generator
to approximately 25% rated load and run the unit
for one hour.
5. Run the unit for one hour at 50% rated load.
6. Run the unit for one hour at 75% rated load.
7. Run the unit for one hour at 100% rated load.
8. Turn ON the utility power supply to the transfer
switch, which will allow the transfer switch to
transfer back to utility power. The unit will con-
tinue to run for one minute and then shut down.
9. Allow the unit to cool.
10. Set the generator’s main circuit breaker to its
OFF (or open) position.
11. Set the generator's AUTO/OFF/MANUAL switch to
OFF. Remove the 5A and 15A fuses from the gen-
erator control panel. Disconnect the battery
cables as outlined in “General Hazards” (page 2).
12. Drain the oil and remove the oil filter. Replace the
oil filter according to Section 4.4, “Changing the
Oil Filter”. Replace the oil with synthetic oil as
recommended in Section 4.3, “Changing the
Engine Oil”.
13. Reconnect the battery cables as outlined in
“General Hazards” (page 2) and insert the 5A and
15A fuses into the generator control panel. The
generator is now ready for service.
3.2 USING THE AUTO/OFF/MANUAL
SWITCH (FIGURE 3.1)
3.2.1 “AUTO” POSITION
Selecting this switch position activates fully automat-
ic system operation. It also allows personnel to start
and exercise the engine every seven days with the set-
ting of the exercise timer (see Section 3.6). This posi-
tion also is used for remote starting, when it is set up.
3.2.2 “OFF” POSITION
This switch position shuts down the engine. This
position also prevents automatic operation.
3.2.3 “MANUAL” POSITION
Set the switch to MANUAL to crank and start the
engine. Transfer to standby power will not occur
unless there is a utility failure.
Figure 3.1 – Generator Control Panel
With the switch set to AUTO, the engine may
crank and start at any time without warning.
Such automatic starting normally occurs when
utility power source voltage drops below a pre-
set level or during the normal exercise cycle. To
prevent possible injury that might be caused by
such sudden starts, always set the switch to
OFF and remove the fuses before working on
or around the generator or transfer switch.
Then, place a “DO NOT OPERATE” tag on the
generator panel and on the transfer switch.
3.3 AUTOMATIC TRANSFER
OPERATION
To select automatic operation, do the following:
1. Make sure the transfer switch main contacts are
set to their UTILITY position, i.e., loads connect-
ed to the utility power source (Figure 3.2).
2. Be sure that normal UTILITY power source volt-
age is available to transfer switch terminal lugs
N1 and N2.
!
HIGH TEMP.
OVER SPEED
LOW OIL
SYSTEM SET
OVER CRANK
MAN.
SET
OFFAUTO
15A
FUSE
EXERCISE
TIME
R
POWER SYSTEMS, INC.
Locate your nearest dealer at:
R
FUSE
5A
EXERCISERNOT SET
NOUTILITYSENSE
4FLASHING RED LEDS=
FLASHINGGREEN LED=