Winco PSS25000/A - Manual (Page 7)

PAGE 5 5076-10 60706-171
also true for the single dual stage regulators, they should
also be minimum of 10 feet from the unit. If this is not
done the demand regulator on the unit and the pressure
regulator in the fuel line will interfere with each other.
When this two (2) stage regulator system is used, a fuel
line size of 1/2 to 5/8 inch is generally adequate for
distances up to 300 feet from the primary to the second-
ary regulator. (Consult your local fuel supplier for your
exact requirements.) The appropriate line size from the
table below is then installed from the second regulator to
the generator set.
*************
***** WARNING ****
*************
PERSONAL DANGER - Do not use galvanized pipe in
fuel line runs. The galvanized coating can become
eroded and flake off, causing possible obstructions in the
regulator or fuel valve. The results could range from
inoperative engine start to hazardous fuel leaks.
NATURAL GAS or LP VAPOR
Size of pipe normally required for generators operating
on NATURAL GAS or LP VAPOR
up to 25 feet* 25 - 100 feet* over 100 feet*
use a two
PSS25000 1" pipe 1.25" pipe regulator system
*Allow an additional 3 feet for each standard elbow. Do not use
‘street ells’ (restrictive)*
LP LIQUID WITHDRAWAL (ONLY)
Size of pipe normally required for generators operating
on LP LIQUID WITHDRAWAL
PSS25000 - 3/8” line for all distances.
**** CAUTION ****
Be careful when sealing gas joints. Excessive sealing
compound can be drawn into the solenoid, regulator or
carburetor causing an engine malfunction.
FUEL PRESSURE
LP & NG VAPOR FUEL
Correct fuel pressure cannot be stressed enough. The
most common cause for inoperative systems is an
inadequate or incorrect fuel pressure. Performance of
the engine is in direct relation to the correctness of the
fuel system. Shown below is a block diagram of a
typical LP or NG vapor fuel installation.
Notice the following tables give two (2) different units of
measuring fuel pressure. The first and most accurate is
the use of a simple water manometer. A manometer is
calibrated in inches of water column. The second is with
a pressure gauge calibrated in ounces per square inch.
Reference number 4 is the engine generator set.
Below is a table of the fuel pressure reading at each
reference in the system.
Fuel Pressure Table
Single Regulator (LP Vapor only)
1 3 4
UNIT OFF TANK PSI 7-11 in 7-11 in
4-6 oz. 4-6 oz.
STARTING TANK PSI 7-11 in 7-11 in
4-6 oz. 4-6 oz.
NO LOAD TANK PSI 7-11 in 7-11 in
4-6 oz. 4-6 oz.
FULL LOAD TANK PSI 7-11 in 7-11 in
4-6 oz. 4-6 oz.
Two (2) Regulator System (LP Vapor only)
1 2 3 4
UNIT OFF TANK PSI 10-15 lbs 7-11 in 7-11 in
4-6 oz. 4-6 oz.
STARTING TANK PSI 10-15 lbs 7-11 in 7-11 in
4-6 oz. 4-6 oz.
NO LOAD TANK PSI 10-15 lbs 7-11 in 7-11 in
4-6 oz. 4-6 oz.
FULL LOAD TANK PSI 10-15 lbs 7-11 in 7-11 in
4-6 oz. 4-6 oz.