Winco PSS21F4/1, Installation And Operator'S Manual, Page: 11 / 36

11
OPM-146/D
NG/LP FUEL CONVERSION
This generator set was tested on both LP and NG at the
factory. Ensure proper fuel configuration before operating.
These engine/generator sets are easy to convert between
LP or NG. As the engine timing is controlled by the ECU on
the engine you only need to tell it what fuel you want to
operate on. A small rocker switch has been provide on the
underside of the engine control cabinet for this purpose.
Opening the rocker switch will tell the ECU mounted on
the engine that you are operating on NG Fuel. Closing the
rocker switch will tell the ECU that the fuel being supplied is
LP. The Advance Power Controller has an indicator light for
LP. When this light is on, the engine is set-up for LP, when
the LP light is out the engine is set up for NG. The ECU will
then reprogram the engine to operate on the proper fuel.
LUBRICATION & COOLANT
Before starting the engine, check the oil level in the
crankcase. If it is low, refill to the full mark with the proper
weight/grade of oil as recommended by the engine
manufacturer’s maintenance instructions. The necessity of
using the correct oil and keeping the crankcase full cannot
be over emphasized. Failure to do so will cause excessive
engine wear and shorten its useful life.
Winco recommends our 5W-30 fully synthetic heavy duty
engine oil to give you maximum cold weather protection
while maintaining excellent performance in warmer
weather. We have partnered with a national lubrication oil
manufacturer to give you access to Winco private branded
premium oil available at comparable prices to conventional
oils. See your dealer for additional information.
Before starting the engine, Check the coolant level in
the radiator. If it is low, refill as specified in the engine
manufacturer’s maintenance instructions. The radiator
should be filled to about 1 inch below the filler neck.
ELECTRICAL CONNECTIONS
NOTICE: CLASS 1 WIRING METHODS ARE TO BE USED FOR
ALL FIELD WIRING CONNECTIONS TO TERMINALS OF A
CLASS 2 CIRCUIT
NOTE: The symbol always indicates ground where
shown. All wiring must be completed in accordance with
the National Electric Code as well as any state and local
codes.
You must pay particular attention to wire size requirement
for the amperage of service you are dealing with. The table
below provides you guidance on wire sizing based on
both wire type and amperage. Wire amperages have been
derated for 40° C ambient temperatures operation.
CAUTION: EQUIPMENT DAMAGE
Do not make any fuel adjustments or governor
adjustments until all pressure readings are in
compliance with specification.
The following diagram is of a natural gas (NG) installation.
Reference numbers 2 through 4 in the previous diagram
are system parts supplied by the customer. Reference
number 4 is on the generator.
FUEL PRESSURE TABLES
The following tables are the fuel pressure readings at each
reference in the system.
SINGLE LOW PRESSURE REGULATOR (LP vapor only)
Ref# 1 3 4
Unit off Line PSI 7-11 in
4-6 oz 7-11 in
4-6 oz
Starting Line PSI 7-11 in
4-6 oz 7-11 in
4-6 oz
No load Line PSI 7-11 in
4-6 oz 7-11 in
4-6 oz
Full load Line PSI 7-11 in
4-6 oz 7-11 in
4-6 oz
TWO REGULATOR SYSTEM (LP vapor only)
Ref# 1 2 3 4
Unit off Line PSI 10-15 lbs 7-11 in
4-6 oz 7-11 in
4-6 oz
Starting Line PSI 10-15 lbs 7-11 in
4-6 oz 7-11 in
4-6 oz
No load Line PSI 10-15 lbs 7-11 in
4-6 oz 7-11 in
4-6 oz
Full load Line PSI 10-15 lbs 7-11 in
4-6 oz 7-11 in
4-6 oz
NATURAL GAS
Ref# 2 3 4
Unit off 2 PSI 7-11 in
4-6 oz 7-11 in
4-6 oz
Starting 2 PSI 7-11 in
4-6 oz 7-11 in
4-6 oz
No load 2 PSI 7-11 in
4-6 oz 7-11 in
4-6 oz
Full load 2 PSI 7-11 in
4-6 oz 7-11 in
4-6 oz