Generac Power Systems 005040-2 owner manual Engineered GTS Transfer Switch

Section 3 - Operation

Guardian Liquid-cooled 25 kW Generator

‹2.11.1 PRIOR TO INITIAL START-UP

Prior to initially starting the generator, it must

!be properly prepared for use. Any attempt to crank or start the engine before it has been properly serviced with the recommended types and quantities 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.”

‹2.11.2 TRANSFER SWITCH

If this generator is used to supply power to any elec- trical system normally powered by an electric utility, the National Electrical Code requires that a transfer switch be installed. The transfer switch prevents elec- trical backfeed between two different electrical sys- tems, (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.

‹2.11.3 FUEL SYSTEM

Make sure the fuel supply system to the generator (a) delivers the correct fuel at the correct pressure and volume and, (b) is properly purged and leak tested according to code. No fuel leakage is permitted.

‹2.11.4 GENERATOR SET LUBRICATION

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.

‹2.11.5 ENGINE COOLANT

Have the engine cooling system properly filled with the recommended coolant mixture. Check the system for leaks and other problems. See “Specifications” and “Coolant”.

‹2.11.6 BELT TENSION

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- inches (10 to 16 mm).

‹2.11.7 ELECTRICAL SYSTEM

Make sure the generator is properly connected to an approved earth ground and/or ground rod.

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 con- nections. Restrain any loose wires to keep them clear of any moving generator set components.

3.1ENGINEERED GTS TRANSFER

SWITCH

When required, the pre-packaged standby generator can be installed with an engineered Generac “GTS” type automatic transfer switch. Set dip switch on engine control PCB to GTS-type.

When using an engineered GTS type transfer switch, it controls automatic operation and automatic trans- fer as follows:

•Solid state circuits in the transfer switch monitor utility power source voltage.

•When utility source voltage drops below a pre-set level, transfer switch action signals the generator to start. The engine then cranks and starts as con- trolled by the pre-packaged 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 switch main contacts to actuate to the “Standby” power source side. Generator AC output then powers load circuits.

•When the utility power source voltage is restored above a pre-set level, transfer switch circuits signal the switch main contacts to move back to their util- ity power source side.

•Following re-transfer back to the utility power source side, transfer switch circuit board action signals the generator to stop. Engine then shuts down.

GTS Mode Operation

When in GTS mode, the control board will respond as follows based on the generator AUTO/OFF/MANU- AL switch position.

12 Generac® Power Systems, Inc.