Gillette Generators SPP-180 - Manual (Page 19)

PAGE 19
NG
L
P
MODEL SPS-120 use the gas system as shown above. The KN gas regulator is used to regulate the gas flow by
responding to pressure changes in the engine intake manifold. When the engine is shut down, with no demand for
fuel, the “demand” secondary regulator stops all gas flow. The first 12 VDC electric fuel solenoid valve acts as a
second positive shut-off device and the second fuel solenoid is for safety per UL2200. The fuel of choice is set at
factory by connecting the engine fuel hose to the barb marked with either LPG (Liquid Propane Gas) or NG (Natural
Gas). The fuel can be easily changed in the field:
Changing from LPG to natural gas fuel and vice-versa is a simple function. The drawing at top & left shows the fuel
line from secondary regulator, to engine carburetor, for LPG fuel. Notice the fuel line is connected to a brass fitting
with “LP” stamped on it. This brass fitting has the LPG venturi for proper LPG fuel operation. Do not remove or re-
position this LPG venture. For natural gas operation, remove the carburetor flexible fuel line from “LP” stamped, brass
fitting and dead-end brass cap from “NG” stamped brass fitting. Attach fuel line to brass fitting marked “NG” and
attach dead-end cap to brass fitting marked “LP”. No other adjustments are required.
REMEMBER: These instructions are only if fuel needs to be changed, at gen-set final location. If fuel is correct at
time of installation, no other changes are required.
MODEL SPP-180 uses a similar fuel system as shown above. The difference is that the engine uses an electronic
fuel mixer which is set for specific Natural Gas or LPG use. This does not allow the fuel needs to be changed, at
gen-set final location. The gen-set must have the correct fuel selection prior to installation.
IMPORTANT: THESE GEN-SETS ARE DESIGNED ON A CLOSE-LOOP SYSTEM, WHICH THE SECONDARY
FUEL REGULATOR & EXHAUST EMISSIONS HAVE BEEN SET TO MEET EPA & C.A.R.B. REGULATIONS.
ANY MODIFICATIONS TO THIS FUEL SYSTEM WILL VOID WARRANTY ON THE ENTIRE GEN-SET. IF EPA
FINDS THAT THE EMISSIONS FROM THIS GEN-SET HAVE BEEN CHANGED, THE USER WILL BE FINED.
CARBURETION SYSTEMS FOR RESIDENTIAL SENTRY-PRO GEN-SETS
KN GAS REGULATOR
GAS HOSE TO ENGINE
GAS SOLENOID VALVE
C.A.R.B AND EPA
CARBURETION SYSTEMS FOR
MODEL SPS-120
USING SUBARU ENGINES
BLANK CAP