Gillette Generators SPP-180 - Manual (Page 9)

PAGE 9
(1) Drawing shows a typical gas utility approach on how to
bring natural gas fuel to the gen-set. The fuel from utility is
connected by dedicated fuel line, to the installed 4 ounce, 7”
water column secondary regulator, inside gen-set housing.
CAUTION: Consult your natural gas supplier about your meter
size. Most meters must be replaced with a larger BTU size, due
to larger demand of BTU’s from generator. The same
procedure is also used with LPG: a 6 ounce, 11” water column,
dedicated primary regulator is placed at fuel outlet of “vapor
withdrawal” LPG tank. Fuel is piped directly to LPG 6 ounce,
11” water column secondary regulator, inside gen-set housing.
(2) Drawing shows chosen circuit connection: Load circuits are
selected based on importance of needs, plus the starting and
running amps. All connected loads should not exceed the amp
size of generator. The auto transfer switch should equal or
exceed total amp load of (F), smaller distribution panel.
When “Chosen” load is matched to gen-set amp size, the gen-
set is never overloaded.
(3) Drawing shows full load connection: The gen-set output is
applied to the entire load of the utility electrical distribution
panel. For this installation, the auto transfer switch, must be of
same amp size as utility power. This is the easiest, lower
priced electrical installation, but subject to gen-set shutdown
whenever load amps exceed gen-set amp capacity.
(A) Drive a corrosion resistant steel stake, into ground and
attach a 10 gauge stranded copper wire from stake to ground
lug on outside of gen-set. This bleeds off any potential
lightning strike and any static electricity, which can occur on
metal parts of ungrounded generators. For a non-separately
derived system (where normal electric utility power is in
building and gen-set is a back-up emergency power
supply), the gen-set neutral must connect only to utility
power neutral and not to the ground stake. The best place
for these two neutrals to meet (generator and utility neutral), is
in the automatic transfer switch. However, still connect gen-set
mechanical ground to the stake. All factory gen-sets, have a
“floating neutral” ready to be connected to utility neutral, by
installer.
(B) Normal utility power meter and power inlet to panel.
(C) Safety disconnect switch, sized to ATS amp rating.
(D) Auto transfer switch with UL-1008 label and NEMA-1
housing for inside installation. Consult factory for NEMA-3R,
outside installations.
(E) Original electric utility distribution panel.
(F) Separate, smaller distribution panel, with chosen circuit
loads.
HELPFUL INSTALLATION TIPS
● Mound the gen-set location upwards at least 1 inch from
normal terrain, for proper drainage. Fill an area 6 inches
larger than gen-set mounting pad perimeter and 3 inches
deep, with crushed gravel. This provides flexible settling of
gen-set and mounting pad. NOTE: Specific locales may
require a cement pad installation.
● Gen-set must be located minimum 5 feet from all structures.
This clearance will provide for ample service room.
● Watch out for roof overhangs. Snow, ice, or rain should not
be allowed to accumulate on roof, and cascade onto gen-set
roof.
● Check prevailing wind direction. Winds should blow
toward the engine end of housing, which is the normal cool air
intake end. The opposite end is hot air discharge.
● Engine exhaust from generator end is hot and dangerous.
Exhaust must be allowed to dissipate into free air zone, with no
obstructions (air conditioner condenser, buildings, plants,
trees, living quarters, etc.) within 5 feet.
● Control wires and load wires should be made in (2)
different circuit runs to auto transfer switch, to avoid any
possible magnetic interference between the two. These lines
should be underground for best protection.
● Don’t allow snow, ice, or debris to accumulate around and
on gen-set. If possible, plant a short hedge or a series of
evergreens, as a protective “wall”, 5 feet from gen-set on
windward (engine) side, to stop such accumulation, and still
TYPICAL EMERGENCY GENERATOR INSTALLATION PRACTICES
MINIMUM 5 FT