Gillette Generators SP-1500 - Manual (Page 17)

PAGE 17
circulate into the radiator core. Thermostat can also
close, restricting the coolant flow, as necessary to
prevent over cooling. The engine fan blows air, from
the engine side, through the fins of the radiator.
When a generator set is installed inside a building
room, the radiator air discharge should be ducted
outside the building, into the atmosphere. A typical
installation is shown on page 14, Figure 5.
Install a set of louvers, 1½ times the size of engine
radiator perimeter. Galvanized metal duct must fit
tightly around louver perimeter and taper down to
be the same size as radiator perimeter, and end at
least 24”-30” from radiator. The connection from
engine radiator to duct work (12” space) should be
heavy canvas, silicone material, or other such
flexible material, to prevent noise and vibration
transmission. Sheet metal duct work should be self
supporting, firmly attached to the hot air discharge
louvers.
The cool air inlet opening, should be a second set of
louvers that is (2) times the size of radiator perimeter.
Over-sizing both air inlet and air outlet, allows for
fine screens across the entire louver area to keep
birds or flying insects, from entering generator
room.
The ideal assembly is to install motorized louvers, so
that when generator is started, the louver motors are
energized by generator power, and become fully
open. Like wise, when generator shuts down,
louvers automatically close.
Rain hoods should be installed over top of each
louver, mounted on outside wall, so that rain won’t
enter into open louvers.
TESTING THE VENTILATION SYSTEM
FOR MAXIMUM PROTECTION
Place a thermometer as close as possible to the cool
air input (engine cooling fan) of the generator set
blower housing. Don’t allow thermometer to touch
any metal surface. Place a second thermometer
outside the building in the hot air discharge, at point
of louvers. Be sure not to allow this thermometer to
be in direct sunlight or any other heat sources. Run
the generator at maximum load for about 1 hour. The
temperature difference between the two
thermometers, should be no more than 20º F.
STARTING BATTERY
All generator models have a fixed position for
installer furnished, 12 VDC starting battery. A
corrosion free battery tray is furnished with woven
hold down strap. Positive and Negative battery
cables are installed and ready for connection to
installed battery. While installing the battery, notice
the Positive battery cable is tightly secured,
so that it can’t move beyond normal distance from
Positive battery post. DO NOT REMOVE THIS
CABLE RESTRAINT. This is a requirement of UL-
2200 and removal of this cable restraint will void UL
Certification. Also, battery connection boots for both
Positive and Negative cables are furnished and
again, required for UL Certification.
Starting batteries are usually sealed lead-acid type,
sized to engine manufacturers recommendation for a
particular ambient temperature and required
cranking time. Recommended engine cranking
periods are specified in NFPA-110 and specifies
cranking cycles times. Battery sizes per generator
model number are on page 17.
Battery is charged by an engine driven, battery
charging alternator, while generator set is running.
These engine/generator systems have charge rates
of 30 to 50 amps or more, depending on size of
generator set, and can restore the charge from
battery, used in a normal cranking cycle within a
short period of time. When generator is in standby
position (not running), a very low charge rate from an
auxiliary
A-C powered battery charger can maintain battery at
full charge.
All GILLETTE generators use a 6 amp, 12 VDC , 3
stage charger (bulk stage for full 6 amp output while
battery voltage rises), absorption stage (regulates
battery voltage at constant voltage while current flow
to battery decreases), and float stage (supplies
charge current at the rate it will be accepted by the
battery).
RECOMMENDED BATTERY SIZES
GENERATOR
MODEL
BATTERY SIZE
BATTERY AWG
CABLE
SP-200
SP-250
SP-300
SP-410
SP-520
SP-620
#1 AWG
SP-8005N
SP-960
SP-1200
BCI GROUP 27
710 CCA to 0º F
#1/0 AWG
SP-1500 #2/0 AWG
BCI GROUP 24F
650 CCA to 0º F
12 VDC BATTERY SYSTEM
FIGURE 8
12 VDC
STARTER
12 VDC
BATTERY
Note: Battery tray will fit max dimensions of 12”LG X 7”WI