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voltage and frequency at no load conditions. Typical
no load test readings should be 230-245 volts at 61.0-
61.5 hertz. After all meter tests are complete, return
the “MODE SELECTOR” switch to the “OFF/RESET”
position. The engine will then shut down.
STEP 4:
When all connections, adjustments, and tests
are completed, and the automatic transfer switch is
installed and wired, the standby generator system is
ready to be placed on standby duty. When testing the
packaged standby set, using the furnished Automatic
Transfer Swtich (ATS), refer to included wiring dia-
grams & ATS owners manual. For an ATS system fur-
nished by others, follow instructions and wiring dia-
grams furnished with the separate ATS system.
STEP 5:
EXERCISER:
Each automatic transfer switch
has an exerciser circuit that automatically starts and
runs gen-set for a predetermined time, before it shuts
down. This “Trial Run” feature is to ensure that sys-
tem is working and ready to use, when you need it,
the most. The automatic engine exerciser must be set
for the automatic time to come on, run for a pre-set
time, then automatically shut itself down. The in-
staller must set the initial exercising time, depending
on the needs of owner. Review the ATS manual for
exercising operation.
IT IS IMPORTANT TO KNOW, THAT WHEN EXER-
CISING THE SELECTION OF NOT TRANSFER-
RING THE LOAD TO THE GENERATOR SET, IS
THE MOST DESIRABLE METHOD.
It is possible that a different auto transfer switch may
be used, rather that the Gillette furnished automatic
transfer switch (ATS). In this case, any different style
or brand, 2-wire ATS will work with generator cir-
cuitry. Consult the owners guide and its wiring dia-
grams, for any different ATS system, for its method of
operation.
STEP 6:
Simulate a utility power failure by turning off
disconnect switch, installed between utility power
and auto transfer switch. The auto transfer switch will
activate. The "Engine Running" LED (located on con-
trol panel) will flash repeatedly for up to 10 seconds
(normal time delay to start) until engine begins to
start and run. (This may be set to 0 seconds depend-
ing on the specific setup at this location.) The auto
transfer switch will switch the connected load from
utility to emergency generator power.
Note that engine generator set must start under an
immediately applied load. In most cases, the gen-set
is strong enough to perform under this demanding
scenario. However, if the load is 75% or more induc-
tive (large motors, UPS systems, large air condition-
ers), it may be necessary to install a time delay de-
vice, allowing gen-set to get up and running (approx.
10 seconds), then allow load to be applied.
STEP 7:
Return the disconnect switch to on position,
allowing utility power, to no longer be interrupted.
The auto transfer switch will sense this and switch the
connected load from emergency generator power,
back to utility power. The engine will continue to run
for 2 minutes and will allow engine and generator to
normally cool down, without connected load.
Optional:
The sensing device may not always be 2-
wire automatic transfer switch. Many auto start/stop,
2-wire sensing devices such as pressure switch, float
switch, temperature switch, may control the start/stop
functions of Sentry-Pro gen-sets, under special cus-
tom applications. However, the operating proce-
dures, as described above, are always the same.
AIR FILTER:
remove air filter cover and existing air
filter element and foam element. Reassemble air fil-
ter with new air filter elements in place. Do not oil the
filter elements.
OIL FILTER:
remove oil filter by turning it counter-
clockwise, using an oil filter wrench. Clean the gas-
ket sealing surface of oil filter holder. Apply a light
coat of clean oil to the rubber seal of the new oil filter.
Dispose of old filter in an environmentally safe man-
ner.
NOTE:
Best time to replace oil filter is during
time of oil change, when oil is drained from engine.
OIL DRAIN:
Remove oil drain hose from the holding
clip. Remove the end cap from end of oil drain hose,
and let oil drain into a separate container. Remove
GENERAL SERVICE TIPS
CAUTION
If the 3 position switch is left in the “STANDBY” posi-
tion at any time, the generator system is being ser-
viced or repaired, the engine may crank and start
without warning. Such automatic starting may hap-
pen when utility voltage dips below a preset voltage
level or during a normal exercise period. To pre-
vent possible injury that may be caused, always set
the “TEST-OFF/REST-STANDBY” switch to “OFF/
RESET” position and remove the 10 amp cartridge
fuse, while working on or around the generator set,
or accompanying automatic transfer switch.
CAUTION
THE ELECTRIC LOAD TO BE APPLIED TO GEN-
ERATOR SET MUST NEVER BE MORE THAT
GENERATOR RATINGS. THE GENERATOR IS
RATED IN WATTS. CALCULATE THE ELECTRI-
CAL LOAD TO BE APPLIED TO GENERATOR IN
WATTS. NEVER EXCEED 75% OF GENERATOR
RATING IN ACTUAL CONNECTED LOAD.
