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Keep unauthorized personnel away from batteries. For recommended batteries, see “Specifications.” All batteries must be at 100 percent state-of-charge before they are installed on the generator. When using maintenance-free batteries, it is not necessary to check the specific gravity or electrolyte level. Have these procedures performed at the intervals specified in Section 4, “Maintenance.” A negative ground system is used. Battery connections are shown on the wiring diagrams. Make sure all batteries are correctly connected and terminals are tight. Observe battery polarity when connecting batteries to the generator set. Note: Damage will result if the battery connections are made in reverse. 10 Generac® Power Systems, Inc. Section 3 - Operation Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators PREPARATION BEFORE START-UP The instructions in this section assume that the stand Ў Engine Coolant Have the engine cooling system properly filled with the by generator has been properly installed, serviced, test- recommended coolant mixture. Check the system for ed, adjusted and otherwise prepared for use by a com-leaks and other problems. See “Specifications” and petent, qualified installation contractor. Be sure to read “Coolant”. the “Safety Rules” on pages 2 and 3, as well as all other Belt Tension safety information in this manual, before attempting to operate this (and related) equipment. • PRIOR TO INITIAL START-UP Ў Check the engine fan belt tension and condition prior to placing the unit into service and at recommended intervals. Belt tension is correct when a force of approximately 22 pounds (10 kg), applied midway between pulleys, deflects the belt about 3/8- to 5/8-inch (10 to 16 mm). Prior to initially starting the generator, it must be ! Ў Electrical System properly prepared for use. Any attempt to crank or start the engine before it has been properly Make sure the generator is properly connected to an serviced with the recommended types and quanti approved earth ground and/or ground rod. ties of engine fluids (oil, coolant, fuel, etc.) may result in an engine failure. Before starting the generator for the first time, the installer must complete the following procedures. For follow-up maintenance information and/or service intervals, please refer to Section 4, “Maintenance.” Make sure the generator battery is fully charged, properly installed and interconnected, and ready for use. Check to ensure that there are no loose electrical connections. Restrain any loose wires to keep them clear of any moving generator set components. Transfer Switch USING A STANDARD “GTS” TRANSFER Ў If this generator is used to supply power to any electrical system normally powered by an electric utility, the National Electrical Code requires that a transfer switch be installed. The transfer switch prevents electrical backfeed between two different electrical systems. (For additional information, see the applicable transfer switch manual for this unit.) The transfer switch, as well as the generator and other standby components, must be properly located and mounted in strict compliance with applicable codes, standards and regulations. SWITCH When required, the pre-packaged standby generator can be installed with a standard Generac “GTS” type automatic transfer switch. When using a standard GTS type transfer switch, it controls automatic operation and automatic transfer as follows: • Solid state circuits in the transfer switch monitor utility power source voltage. • When utility source voltage drops below a pre-set level, Ў Fuel System Make sure the fuel supply system to the generator (a) delivers the correct fuel at the correct pressure and (b) is properly purged and leak tested according to code. transfer switch action closes the circuit. The engine then cranks and starts as controlled by the pre-pack aged generator’s Control Module circuit board. • After the engine starts and when the generator AC output voltage and frequency have reached a pre-set value, transfer switch circuits signal the transfer No fuel leakage is permitted. See “Specifications” for more information. Ў Generator Set Lubrication switch main contacts to actuate to the “Standby” power source side. Generator AC output then powers load circuits. Check the engine crankcase oil level before operating and add oil to the proper level – the dipstick “FULL” mark. Never operate the engine with the oil level below the dipstick “ADD” mark. See “Specifications” and “Engine Oil Recommendations”. NOTE: This engine is shipped from the manufacturer with 15W-40 oil. This oil should be changed after 30 hours of operation. • When the utility power source voltage is restored above a pre-set level, transfer switch solid state circuits signal the switch main contacts to move back to their utility power source side. • Following re-transfer back to the utility power source side, transfer switch circuit board action opens the circuit. Engine then shuts down. NOTE: If the gener...

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