INTRODUCTION Thank you for purchasing this model of the standby generator set product line by Generac Power Systems. Every effort was expended to make sure that the information and instructions in this manual are both accurate and current at the time the manual was writ- ten.
IMPORTANT SAFETY INSTRUCTIONS Guardian Liquid-cooled 27 kW and 30 kW Generators SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe operation be copied and posted in potential hazard areas. Safety should be stressed to all operators, potential operators, and service and repair technicians for this equipment. SAVE THESE INSTRUCTIONS –...
• Inspect the generator regularly, and promptly repair or replace all worn, damaged or defective parts using only factory-approved parts. • Before performing any maintenance on the generator, disconnect its battery cables to prevent accidental start-up. Disconnect the cable from the battery post indicated by a NEGATIVE, NEG or (–) first.
Section 1 - General Information Guardian Liquid-cooled 27 kW and 30 kW Generators GENERATOR This equipment is a liquid-cooled, engine-driven gen- erator set. The generator is designed to supply elec- trical power that operates critical electrical loads during utility power failure. The unit has been facto- ry-installed in a weather resistant, all metal enclosure and is intended for outdoor installation only.
GENERATOR FUEL SYSTEM The unit has been factory tested and adjusted using a natural gas fuel system. If propane (LP) gas is neces- sary, contact an authorized service dealer. Fuel pressure for a natural gas set up should be five inches to 14 inches of water column (0.18 to 0.5 psi) at all load ranges.
Section 1 — General Information Guardian Liquid-cooled 27 kW and 30 kW Generators Figure 1.6 - Low Coolant Level Sensor 1.7.4 OVERSPEED SHUTDOWN The engine control board receives AC frequency sig- nals from an engine run winding in the alternator. Should AC frequency exceed about 72 Hertz for three seconds or 75 Hertz instantaniously, the engine shuts down and the overspeed LED turns on.
1.10 SPECIFICATIONS 1.10.1 GENERATOR SPECIFICATIONS Model Rated Max. Cont. AC Power Output (kW) Rated voltage (volts) No. of Rotor Poles Driven Speed of Rotor Rotor Excitation System Direct excited brush type Type of Stator Rotor/Stator Insulation 1.10.2 ENGINE SPECIFICATIONS Make...Ford Displacement ...3.0 liters Cylinder Arrangement ...V-6 Valve Arrangement ...Overhead Valve...
• NFPA No. 220, STANDARD TYPES OF BUILDING CONSTRUCTION • NFPA No. 68, GUIDE FOR EXPLOSION VENTING • NFPA No. 70, NATIONAL ELECTRICAL CODE. • NFPA No. 30, FLAMMABLE AND COMBUSTIBLE LIQUIDS CODE. • NFPA No. 10, INSTALLATION, MAINTENANCE AND USE OF PORTABLE FIRE EXTINGUISHERS.
Section 2 — Installation Guardian Liquid-cooled 27 kW and 30 kW Generators • It must have an ampere rating equal to the total amperage rating of the emergency distribution panel circuit. • Have it installed between the building’s main dis- tribution panel and the emergency distribution panel.
2.10 BATTERY INSTALLATION DANGER Standby generators installed with automatic transfer switches will crank and start automati- cally when NORMAL (UTILITY) source voltage is removed or is below an acceptable preset level. To prevent such automatic start-up and possible injury to personnel, do not connect battery cables until certain that normal source voltage at the transfer switch is correct and the system is ready to be placed into operation.
Section 3 — Operation Guardian Liquid-cooled 27 kW and 30 kW Generators 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”...
Figure 3.1 - Home Standby Generator Panel LED INDICATORS: FLASHING GREEN LED = NO UTILITY SENSE 5 FLASHING RED LED'S = EXERCISER NOT SET (IN AUTO MODE ONLY) SOLID GREEN LED = SYSTEM READY, UTILITY POWER ON RED LED'S = INDIVIDUAL FAULT (SEE OWNER'S MANUAL FOR COMPLETE LED DETAILS) OVER CRANK AUTO...
Section 3 — Operation Guardian Liquid-cooled 27 kW and 30 kW Generators 6. Adjust differential pot to make the recovery to load changes even faster and minimize load change undershoot and overshoot. If it is set too high it may introduce oscillations at some load. It can be set to zero (full CCW) if a small amount causes oscillations at some load.
MAINTENANCE PERFORMED BY AUTHORIZED SERVICE FACILITIES A. EVERY THREE MONTHS 1. Check battery state of charge and condition. 2. Inspect and test fuel system. 3. Check transfer switch. 4. Inspect exhaust system. 5. Check engine ignition system. 6. Check fan belts. B.
Section 4 — Maintenance Guardian Liquid-cooled 27 kW and 30 kW Generators 4.4.3 ENGINE COOLANT Check coolant level in coolant recovery bottle. See Specifications, Section 1.10. • Add recommended coolant mixture as necessary. • Periodically remove radiator pressure cap to make sure the coolant recovery system is functioning properly.
7. Start engine and check for oil leaks. Figure 4.2 - Oil Filter OIL FILTER 4.5.11 CHANGING THE ENGINE AIR CLEANER To replace the engine air cleaner, (part number 059402), remove the air cleaner cover and replace the air filter making sure it is positioned properly before reattaching the cover (Figure 4.3).
Section 4 — Maintenance Guardian Liquid-cooled 27 kW and 30 kW Generators • DO NOT recharge a weak battery while it is installed in the generator. Remove battery from generator and recharge in a well-ventilated area, away from fuel vapors, sparks, heat or flames. •...
SCHEDULED MAINTENANCE Following is a recommended maintenance schedule for Generac small standby and residential generator sets. The established intervals in the schedule are the maximum recommended when the unit is used in an average service application. They will need to be decreased (performed more frequently) if the unit is used in a severe application. Use the unit hour meter or calendar time, whichever occurs first, from the previous maintenance interval to deter- mine the next required maintenance interval.
Section 4 — Maintenance Guardian Liquid-cooled 27 kW and 30 kW Generators Maintenance Level 1 Tasks Recom- mended to be done monthly/ 10 hrs. 1. Disable the unit from operating per the first page warning. 2. Check the engine oil level. Adjust as necessary.
Maintenance Level 1 Tasks Recom- mended to be done monthly/ 10 hrs. 13. Initiate an automatic start and transfer of the unit to site load and exercise it for at least 1 hour looking for leaks, loose connections or components, and abnormal operating conditions.
Section 5 — Troubleshooting Guardian Liquid-cooled 27 kW and 30 kW Generators TROUBLESHOOTING POINTS PROBLEM Engine won’t crank. Engine cranks, but won't start Engine starts hard, runs rough. Engine starts, then shuts down. AUTO/OFF/MANUAL Switch at, OFF engine continues to run No AC output from generator.
ITEM PART NO. QTY. DESCRIPTION 0E5193 PLATE AIR CLEANER ADAPTER 0E8200 TUBE AIR INTAKE 3.0L FORD 0E8201 BRACKET AIR INTAKE 3.0L FORD 036434 BOLT U 5/16-18 X 2.09 0E0519A ADAPTER, CARBURETOR W/PVC CONN 0C8127 ELEMENT, AIR CLEANER 0A5547 COVER - AIR CLEANER 062974 STUD TH 1/4-20 X 4-1/2 G2 ZNC 022127...
"PREPACKAGED EMERGENCY AUTOMATIC STANDBY GENERATORS" For a period of two years from the date of original sale, Generac Power Systems, Inc. (Generac) warrants that its Guardian generator will be free from defects in material and workmanship for the items and period set forth below. Generac will, at its option, repair or replace any part which, upon examination, inspection and testing by Generac or a Guardian Authorized Warranty Service Dealer, is found to be defective.