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LP
NG
MODELS SPS-100, SPS-120, & SPH-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.
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 MODIFI-
CATIONS 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
NAT. GAS
INPUT IS
BLOCKED
OFF WITH
DEAD-END
CAP
N
G
LP
L
P
G
F
U
E
L
C
O
N
N
E
C
T
E
D
C.A.R.B AND EPA
CARBURETION SYSTEMS FOR
MODEL SPS-100 & SPS-120,
USING SUBARU ENGINES
C.A.R.B AND EPA
CARBURETION SYSTEMS
FOR MODEL SPH-120
USING HONDA ENGINE
BLANK CAP
