Winco PSS65LS-*/B - Manual (Page 14)

Page 12 1017-10 60706-144
LP/NG FUEL ADJUSTMENTS
**** CAUTION ****
EQUIPMENT DAMAGE - Do not make any fuel adjust-
ments or governor adjustments until all pressure readings
are in compliance with specification. See fuel pressure
charts (tables 1, 2, and 3).
NATURAL GAS (NG)
Due to variations in NG fuel characteristics and BTU lev-
els throughout the country, it may be necessary to readjust
the fuel mixture once the engine has been installed and
serviced.
**** CAUTION ****
EQUIPMENT DAMAGE - Never make a fuel mixture ad-
justment on a unit when it is stopped or running no load. A
mixture adjustment is only effective when the engine is
operating under load.
Adjustment Procedure
1. Ensure the unit is operating under an 80 to 100% load
or at the highest anticipated load.
Note: On these units the mixture adjustment is located on
the bottom of the fuel inlet housing on the carburetor. This
mixture adjustment is a partial turn, lean to rich, load block.
2. Begin making a mixture adjustment, listen to how the
engine is running. You want to get the engine running as
smoothly as possible under load. If the fuel is too rich or
too lean, the engine will start to struggle to maintain the
proper loaded RPM.
3. Because this engine generator set is equipped with an
electronic governor the frequency should remain correct,
but it is a good idea to check the frequency after making a
fuel adjustment just to be sure.
4. If it should become necessary to adjust the governor,
the control module is mounted on the left side of the con-
trol panel support brackets.
**** CAUTION ****
EQUIPMENT DAMAGE - Under full load do not adjust
the Hz above 60. If a higher Hz reading is used, as the
load is decreased the Hz will go out of upper limits (61 to
62 Hz).
PROPANE (LP)
A generator set factory tested on LP will normally require
no adjustment. If for some unforeseen reason the machine
should require adjustment, follow the above procedure.
FUEL TYPE CONVERSION
If it should be necessary to change the type of fuel being
used after the unit has been shipped from the factory it will
be necessary to change the air gas valve assembly in the
vapor fuel carburetor. The following conversion proce-
dures are provided.
AIR GAS VALVE ASSEMBLY PART NUMBERS
Natural Gas
P/N 98754-700
LP P/N 98754-701
NOTE: For conversion to/from liquid withdrawal LP con-
sult the factory. Additional parts will be required for this
conversion.
NATURAL GAS TO PROPANE VAPOR
1. Turn off fuel supply.
2. Remove the fuel line from the carburetor at the
demand regulator.
3. Remove the cap on the upright column of the
regulator. This will expose the pressure spring
adjusting screw. Back off the spring adjusting screw
so there is just enough room to replace the cover.
Replace the cover.
4. Invert the regulator so it is positioned with the
column pointing down.
5. Remove the Air Cleaner to expose the top of
carburetor.
6. Remove the six screws holding the top on the
carburetor and remover the air gas valve assembly.
7. Install the new air gas valve assembly part number
98574-701. Replace the top of the carburetor and
tighten all six screws uniformly and reinstall the air
filter.
8. Reconnect the fuel line at the regulator.
9. Remove the 1/8 NPT plug (the one closest to fuel
solenoid) located on what is now the top of the
regulator. Connect a fuel pressure meter or a
monometer where the plug has been removed. Move
the generator control switch to the run position. As
the unit starts to crank the fuel solenoid will open
and you should get a pressure reading of between 4
to 6 ounces (7 to 11 inches of water column).
10. If the pressure is correct, remove the meter and re-
install the pipe plug.
11. You are now ready to make the final fuel mixture
adjustment. Refer to adjustment section in this
manual.