Guardian Technologies 004725-0, 004725-3, 004723-0, 004726-0 Using a Standard GTS Transfer Switch

Section 3 — Operation

Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators

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

(b)is properly purged and leak tested according to code. No fuel leakage is permitted. See “Specifications” (Section 1.10) for more information.

‹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” (Section 1.10) and “Engine Oil Recommendations” (Section 1.14).

‹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.

3.1USING A STANDARD “GTS”

TRANSFER SWITCH

When required, the pre-packaged standby generator can be installed with a Generac “GTS” type engi- neered automatic transfer switch.

When a GTS type transfer switch is used, it controls automatic operation and automatic transfer as fol- lows:

•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 closes the circuit. The engine then cranks and starts as controlled 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.

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

•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.

Have the engine cooling system properly filled with the recommended coolant mixture. Check the system for leaks and other problems. See “Specifications” (Section 1.10) and “Coolant” (Section 1.15).

‹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- inch (10 to 16 mm).

NOTE:

If the generator is installed in conjunction with a GTS type transfer switch, refer to the applicable transfer switch manual for exact operating param- eters and timing sequences.

12 Generac® Power Systems, Inc.