General Information
Owner’s Manual for Stationary Industrial Generators 9
2.5.3.1—LP Vapor Withdrawal Fuel System
Utilizes the vapors formed above the liquid fuel in the supply tank. Approximately 10 to 20 percent of the tank capacity
is needed for fuel expansion from the liquid to the vapor state.
2.5.3.2—LP Liquid Withdrawal Fuel System
LP in a liquid withdrawal system must be converted to its gaseous state before it is introduced into the engine carbure-
tor. A vaporizer converter is used to accomplish this. In such a converter, heated engine coolant is ported through the
converter to provide the necessary heat for conversion of the fuel from a liquid to a gaseous state.
NOTE: Units with LP gas liquid withdrawal systems incorporate a block heater as standard equipment. The
heater is powered by the utility power source during non-operating periods to provide heated coolant to aid in
the fuel vaporization process.
2.5.3.3—Dual Fuel: NG/LP Fuel System
Some applications require the use of a “dual-fuel” system. This type of fuel system allows the generator to run on either
natural gas (primary) or LP vapor or liquid (secondary). In the event that the primary source (utility supplied) becomes
unavailable, the unit automatically switches to the secondary source. It can do so while in operation or while not oper-
ating.
2.6 — Specifications
2.6.1— Generator
Refer to the data plate on the generator for rated watts, amperes, frequency, voltage, phase, and other important infor-
mation.
2.6.2— Engine Oil Recommendations
The engine has been filled with factory engine oil of a grade recommended by the engine supplier as follows:
• Gaseous Engines: 6.8L displacement or smaller - SAE 5W-20; Displacement larger than 6.8L - SAE 40.
• Diesel Engines: SAE 15W-40
The manufacturer recommends an initial oil and filter change after the first 50 hours (or first 3 months) of service oper-
ation. Use a high quality detergent oil with an appropriate classification and viscosity for the engine type and ambient
temperature conditions. Consult your Authorized Servicing Dealer for oil recommendations. Synthetic oils meeting the
same service category and viscosity requirements for the application may be used.
• Recommended API Service Category for gaseous engines: SJ, SL, SM, or SN.
• Recommended API Service Category for diesel engines: CH-4, CI-4, or CJ-4
2.6.3— Coolant
Use only deionized or distilled water and Ethylene glycol antifreeze (Propylene glycol can also be used but do not mix
with Ethylene glycol). When adding coolant, always add the recommended 50-50 mixture.
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