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The oil grade for temperatures below 32° F is 5W30 synthetic oil. 3-1 Equip001 Rev. 0 08/05 Standby Generator Sets Engine Protective Devices Standby Generator Sets Engine Protective Devices ENGINE PROTECTIVE DEVICES The standby generator may be required to operate for long periods of time without an operator on hand to monitor such engine conditions as coolant temperature, oil pressure or rpm. For that reason, the engine has several devices designed to protect it against potentially damaging conditions by automatically shutting down the unit when the oil pressure is too low, the coolant temperature is too high, the coolant level is too low, or the engine is running too fast. NOTE: Engine protective switches and sensors are mentioned here for the reader’s convenience. Also refer to the applicable control panel manual for additional automatic engine shutdown information. • HIGH COOLANT TEMPERATURE SWITCH This switches contacts close if the temperature should exceed approximately 140° C (284° F), initiating an engine shutdown. The generator will automatically restart and the LED will reset once the temperature has returned to a safe operating level. • LOW COOLANT LEVEL SENSOR Should the engine coolant level drop below the level of the high coolant temperature switch, it is possible for the engine to overheat without automatic shutdown. To prevent such overheating, the engine has a low coolant level sensor. If the level of engine coolant drops below the level of the low coolant level sensor, the engine automatically shuts down. • LOW OIL PRESSURE SWITCH This switch has normally closed contacts that are held open by engine oil pressure during cranking and operating. Should oil pressure drop below the 8 psi range, switch contacts close, and the engine shuts down. The unit should not be restarted until oil is added, and the AUTO/OFF/MANUAL switch must be turned to OFF and then back to AUTO. • OVERCRANK SHUTDOWN After a prespecified duration of cranking, this function ends the cranking if the engine has failed to start. The overcrank LED will turn ON. Turn OFF the AUTO/OFF/MANUAL switch, then turn switch back to AUTO to reset the generator control board. NOTE: If the fault is not corrected, the overcrank feature will continue to activate. Approximate Crank Cycle Times • 15 seconds ON • 7 seconds OFF • 7 seconds ON • 7 seconds OFF • Repeat for 45 seconds Approximately 90 seconds total. • OVERSPEED SHUTDOWN A speed circuit controls engine cranking, start-up, operation and shutdown. Engine speed signals are delivered to the circuit board whenever the unit is running. Should the engine overspeed above a safe, preset value, the circuit board initiates an automatic engine shutdown. Contact the nearest Authorized Dealer if this failure occurs. • RPM SENSOR LOSS SHUTDOWN If the speed signal to the control panel is lost, engine shutdown will occur. • DC FUSE This fuse is located inside of the control panel. It protects the panel wiring and components from damaging overload. Always remove this fuse before commencing work on the generator. The unit will not start or crank if the fuse is blown. Replace the fuse with one of the same size, type, and rating. (See the exploded views and parts lists at the end of this manual for replacement part number.) 4-1 EngProt001 Rev. 0 08/05 Standby Generator Sets Fuel Systems Standby Generator Sets Fuel Systems FUEL SYSTEM • FUEL REQUIREMENTS The standby generator may be equipped with one of the following fuel systems: • Natural gas fuel system • Propane vapor (PV) fuel system The Manual Drawing Listing that is affixed to the unit includes the “Identification Code,” which may be used to identify the type of fuel system installed on the unit. Recommended fuels should have a Btu content of at least 1,000 Btus per cubic foot for natural gas; or at least 2,520 Btus per cubic foot for LP gas. Ask the fuel supplier for the Btu content of the fuel. Required fuel pressure for natural gas is 5 inches to 14 inches water column (0.18 to 0.5 psi); and for liquid propane, 5 inches to 14 inches of water column (0.18 to 0.5 psi). NOTE: Any piping used to connect the generator to the fuel supply should be of adequate size to ensure the fuel pressure NEVER drops below five inches water column for natural gas or 5 inches water column for propane vapor for all load ranges. NOTE: It is the responsibility of the installer to make sure that only the correct recommended fuel is supplied to the generator fuel system. Thereafter, the owner/operator must make certain that only the proper fuel is supplied. • NATURAL GAS FUEL SYSTEM Natural gas is supplied in its vapor state. In most cases, the gas distribution company provides piping from the main gas distribution line to the standby generator site. The following information applies to natural gas fuel systems. • Gas pressure in a building is usually regulated by national, state and local codes. • To reduce gas pressure to a safe level before the gas enters a buildin...
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