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Generac Power Systems 20 - page 1
ST ANDBY GENERA T OR O WNER'S MANU AL This manual should remain with the unit. A ne w standar d of reliability Serial Number 1.6L 20/25/30 kW Models N ot i nt ended for us e i n c r i t i c al l i f e s uppor t appl i c at i ons. ONL Y QU ALIFIED ELECTRICIANS OR CONTRA CT ORS SHOULD A TTEMPT INST ALLA TION! DEADL Y EXHA UST FUMES. ...
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Generac Power Systems 20 - page 2
Standby Generator Sets T able of Contents SECTION P AGE SAFETY RULES ................................................ 1-1 INTRODUCTION ..................................................... 1-3 Read this Manual Thoroughly ................................... 1-3 Operation and Maintenance ...................................... 1-3 How to Obtain Servic ...
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Generac Power Systems 20 - page 3
Study these SAFETY RULES carefully before install- ing, operating or servicing this equipment. Become familiar with this Owner’s Manual and with the unit. The generator can operate safely , efficiently and reli- ably only if it is properly installed, operated and maintained. Many accidents are caused by failing to follow simple and fundamental ru ...
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Generac Power Systems 20 - page 4
• Before performing any maintenance on the gen- erator , disconnect its battery cables to prevent accidental start -up. Disconnect the cable from the battery post indicated by a NEGA TIVE, NEG or (–) first. Reconnect that cable last. • Never use the generator or any of its parts as a step. Stepping on the unit can stress and break parts, and ...
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Generac Power Systems 20 - page 5
1-3 I NTRODUCTION Thank you for purchasing this model of the standby generator set product line. Every effort was expended to make sure that the information and instructions in this manual were both accurate and current at the time the manual was written. However , the manufacturer reserves the right to change, alter or otherwise improve this produ ...
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Generac Power Systems 20 - page 6
I DENTI F ICA TION REC ORD D A T A LA BE L Every generator set has a DA T A LABEL that contains important information pertinent to the generator . The data label, which can be found attached to the gen- erator’s lower connection box, lists the unit ’s serial number and its rated voltage, amps, wattage capacity , phase, frequency , rpm, power fa ...
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Generac Power Systems 20 - page 7
E QUIPM ENT DE SCRI PTION This equipment is a revolving field, alternating cur - rent generator set. It is powered by a gaseous fueled engine operating at 1800 rpm for 4-pole direct drive units, 3600 rpm for 2-pole direct drive units and 2300 - 3000 rpm for quiet drive gear units. See the Specifications section for exact numbers. The unit comes com ...
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Generac Power Systems 20 - page 8
ENGI N E P RO TECTIVE DEVICE S 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 tempera- ture, oil pressure or rpm. F or that reason, the engine has several devices designed to protect it against potentially damaging conditions by automatically shuttin ...
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Generac Power Systems 20 - page 9
F U E L SYST E M FUE L RE QUIRE MEN T S 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 uni ...
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Generac Power Systems 20 - page 10
SP E CI F ICA TIONS GEN ERA T OR T ype ............................................................................. Synchronous Rotor Insulation .................................................................... Class F Stator Insulation ................................................................... Class F T otal Har monic Distor tion .... ...
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Generac Power Systems 20 - page 11
COLD WEA THER KIT F or cold climates, optional cold weather kit (part number 0F6148) is recommended. The kit includes: • Battery W armer • 4” Junction Box with hardware • 6 qt. pack 5W -30 synthetic oil (engine) R E C ON FIGU R I NG TH E FU EL SY S TEM NOTE: All models are configured to run on natural gas from the factory . T o reconfigure ...
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Generac Power Systems 20 - page 12
GEN ER A T OR AC LEAD C ONN ECTIONS See “V oltage Codes”. This generator may be rated at any one of three voltages, either single -phase or three -phase. The electrical wires in the unit ’s AC con- nection (lower) panel should be installed according to the number of leads and the voltage/phase required for the application. If there are any qu ...
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Generac Power Systems 20 - page 13
I NS T ALLA TION Refer to the separate “Installation Guide” supplied with the unit. P R EP AR A TION B EFOR E ST ART -UP The instructions in this section assume that the standby generator has been properly installed, ser - viced, tested, adjusted and otherwise prepared for use by a competent, qualified installation contractor . Be sure to read ...
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Generac Power Systems 20 - page 14
• Battery charger connection to 120 V AC. • Communication wires connected between transfer switch and generator (HTS only). • Unit secured to pad. S T ART -U P CH E CKLIS T Before working on the generator , ensure the fol- lowing: • The AUTO/OFF/MANU AL switch is in the OFF position. • The 120V AC supply to the battery charger is swit ...
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Generac Power Systems 20 - page 15
GEN ER A T OR CONTROL AND OP ER A TION Refer to the appropriate control panel operator’s manual for this unit. OP ER A TING U N IT WITH MAN UAL TR ANSF ER SWIT CH If the generator was installed in conjunction with a transfer switch capable of manual operation only , the following procedure applies. A manually operated transfer switch is one that ...
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Generac Power Systems 20 - page 16
MAI NTENANCE P ER FOR M ED B Y SERVICE F ACI LITIES Before working on the generator , ensure the fol- lowing: The AUTO/OFF/MANU AL switch is in the OFF position. The 15A fuse has been removed from the con- trol box. The 120V AC supply to the battery charger is switched OFF . EVER Y TH R EE MONTHS 1. Check battery condition. 2. Inspect and test ...
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Generac Power Systems 20 - page 17
Figure 10.1 - Oil Dipstick and Oil Fill Cap OIL FILL CAP OIL DIPSTICK B A TTE R Y FL UID Check battery electrolyte fluid based on the Maintenance Schedule. Fluid should cover separa- tors in all battery cells. If fluid level is low , add dis - tilled water to cover tops of separators. DO NOT USE T AP W A TER IN BA TTERY . ENGI NE COOLANT Check cool ...
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Generac Power Systems 20 - page 18
CHANGI NG ENGIN E OI L Refer to maintenance performed by service facilities for engine oil and filter change frequencies. Drain the oil while the engine is still warm from run- ning . This means warm up the engine, shut it down and drain immediately as follows: 1. Remove OIL DRAIN HOSE from its retaining clip. 2. Loosen and remove OIL DRAIN HOSE CA ...
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Generac Power Systems 20 - page 19
M IS CELL AN E OUS MAI NTENANCE CLEAN ING TH E GEN ER A T OR Keep the generator as clean and as dry as possible. Dirt and moisture that accumulates on internal gen- erator windings have an adverse effect on insulation resistance. P eriodically clean generator exterior surfaces. A soft brush may be used to loosen caked on dirt. Use a vacuum system o ...
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Generac Power Systems 20 - page 20
SERVICE S CH EDU LE The following is a recommended maintenance schedule for 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 applica- t ...
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Generac Power Systems 20 - page 21
Maintenance Level 1 Level 2 Level 3 Level 4 T asks Recom- T ask Required T ask Required T ask T ask mended Comp . to be done Comp . to be done Comp . Required Comp . to be done (Date- 3 months/ (Date- Semi- (Date- to be done (Date- monthly Initials) Break-in Initials) annually Initials) Annually Initials) 10 Hrs. 30 Hrs. 50 Hrs. 100 Hrs. 1. Disable ...
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Generac Power Systems 20 - page 22
Maintenance Level 1 Level 2 Level 3 Level 4 T asks Recom- T ask Required T ask Required T ask T ask mended Comp . to be done Comp . to be done Comp . Required Comp . to be done (Date- 3 months/ (Date- Semi- (Date- to be done (Date- monthly In itials) Break-in Initials) annually Initials) Annually Initials) 10 Hrs. 30 Hrs. 50 Hrs. 100 Hrs. 13. Initi ...
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Generac Power Systems 20 - page 23
TROU B LE SHOO TI NG GU I DE P ROB LEM CAUSE C OR R E CTION Engine won’t crank. 1. 15 amp fuse blown. 1. Replace fuse. 2. Loose or corroded or defectiv e 2. Tighten, clean or replace battery cables. batter y cables as necessary . 3. Defectiv e star ter contactor . 3. Replace contactor.* 4. Defectiv e star ter motor . 4. Replace star ter motor.* 5 ...
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Generac Power Systems 20 - page 24
Standby Generator Sets Notes ...
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Standby Generator Sets Notes ...
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Standby Generator Sets Notes ...
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Standby Generator Sets Notes ...
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Generac Power Systems 20 - page 29
1 0G4827 1 ASSY RTR 104 KD1 HI EFF ( 18KW) 0 G2927 1 RTR-102-20.0AD1 CPL (2006) (20KW) 0 G2827 1 ASSY RTR 25KW 2P (2006) (25KW) 0G34 51C 1 RTR 102 30KD2 (20 06) CPL CHI ( 30KW) 2 0G0820A 1 HO USING BLOWE R LG PILOT 3 0G4452 1 BLOWER HOUSING SCREE N 4 020746 4 SCREW PPHM M5-0. 8 X 8 ZINC 5 049226 4 WASHER LOCK M5 6 051713 4 WASHER FLAT M5 7 022129 4 ...
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Generac Power Systems 20 - page 31
1 N/A N/A UL BREAKER BQ2 A 0D5543 1 CB 0090A 2P 240V S BQ2 LL 0D5544 1 CB 0100A 2P 240V S BQ2 LL 0A2077 1 CB 0125A 2P 240V S BQ2 LL B 0G 44 99 1 CB COVER 20-25K 1P (BQ 2) C 0C2265 2 SCREW PHTT M4- 0.7 X 12 ZYC D 0C2264 2 WASHER LOCK # 8-M4 E 0E7890 1 BRKT CB M TG BACK F 0G4497 1 CIRCUIT BREAKE R SUPPORT (BQ) G 05 2619 2 SCREW HHC M 5-0.8 X 20 G8.8 ...
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C O M PO N EN T S IN CL UD ED IN 0 G 4 5 77 E 1 0 F 1 8 2 3A 1 EN C L H SB C O N T R OL P A N EL 2 0F 307 8 1 C O V E R C ON T R O L PA N E L 3 0F 260 6 1 H IN G E C O N TIN U O U S H -P A N E L 4 03 62 6 1 6 R IV E T P O P .1 2 5 X .2 75 S S 5 0 E 7 3 5 8 4 SC R E W P P PH H I -L O #4 -24 X 3 /8 6 05 27 7 7 3 W A S H ER FL AT M 3 7 0 G 395 8D 1 A ...
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1 0G3418 1 RADIATOR SUPPORT LH SID E 1.6L 2 0G3421 1 VENTU RI 1.6L 3 0G3419 1 RADIATOR SUPPORT RH SID E 1.6L 4 0E9837B 1 RADIATOR 1 .6L CHY 5 0G3553 1 FAN COOL 450MM DIA 7 BL ADE 6 0E 3257 2 S CREW HWHTF M6-1.0 X 16 7 0G4080 1 HOSE LOWE R RADIATO R 1.6L 8 099502 6 CLAMP HOSE #24 B1.0 6-2.00 9 0G4070 1 HOSE RE AR COOLANT 1. 6L 10 0G4072 1 TUBE ENGI ...
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1 0G33 43 1 M OUNTING BASE 1 .6L 2007 C1 2 02748 2 2 WASHE R SHAKEP ROOF EXT 5/16 STL 3 07093 6 2 DAMPE NER VIBR ATION 4 07093 6C 2 VIB. ISO. 7 0-75 DURO 5 03925 3 8 SCREW HHC M8-1. 25 X 20 G 8.8 6 02214 5 1 2 WASHER FL AT 5/16 ZINC 7 02212 9 1 2 WASHER LO CK M8-5/ 16 8 04577 1 4 NUT HEX M8-1.25 G 8 YEL C HR 9 07195 6 4 WASHE R FLAT M 8 10 0517 30 ...
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1 0F3 408C 1 BATTERY T RAY, C1 & C2 2 0F3411 1 STRAP BATTERY RETAI NMENT 3 025507 1 WASHE R SHAKEPROOF EX T 7/16 STL 4 059980 1 SCREW HHC M10-1.5 X 25 G10.9 5 046526 1 WASHE R LOCK M10 6 077483 REF BATTERY 12VDC 75-A H 26 7 050331A REF BATTERY P OST COVER RED + 8 050331 REF BATTERY POST COVE R BLK - 9 0 38805J 1 CA BLE BATTERY BLAC K #1 X 30.00 ...
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Generac Power Systems 20 - page 41
1 0G0207 REF ENGINE GEN ERAC 1. 6L NG 2 0G0834 1 ENGINE PL ATE 1.6L 3 0G0820 REF HOUSING BLOWER MAC HINED 1.6L 4 0E 9747 1 S TARTER 12 VOLT 5 0G0839 2 ENGINE M OUNTING FOO T STAMPING 6 0G0781 1 EX HAUST MANIFOLD 1. 6L MACHINED 7 0G0722 1 INT AKE MANIFOLD MA CHINED 1.6L 8 0G4059 1 SHIELD 1 .6L EXHAUST HEAT 9 0G4604 1 DC ALTE RNATOR ADA PTER MACHI NE ...
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1 098290 1 ASM MOTO R STEPPER 2 098941A 1 HOUSING GOVE RNOR CON NECTOR 3 098958A REF CONNEC TOR INTERFA CE ASSEMBLY 4 098942A 1 COVER CO NNECTOR HOUSI NG 5 098225 2 SCREW FHM #2 X 5/8 SELF TAP 6 043146 3 SCREW HHC M6-1.0 X 1 0 G8.8 7 022097 5 WASHE R LOCK M6-1/ 4 8 084543A 1 SCREW PHM M3- 0.5 X 12M M 9 098783 1 LEV ER STEPPER MOTOR 10 037 398 2 NUT ...
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1 026812 2 ELBOW 90D 3/4 NPT 2 075580 1 FLANGE FUEL INLET 3 0G1397A 1 FUEL REG. RE WORK 1.6L 3600 '07 (3600RPM) 0G1397B 1 FUEL REG. REWORK 1.6L 1800 '07 (1800RPM ) 4 039253 2 SCREW HHC M8-1.25 X 20 G8.8 5 022145 2 WASHER FLAT 5/16 ZINC 6 022129 4 WASHER LOCK M8-5/ 16 7 045771 2 NUT HEX M8-1.25 G 8 YEL CHR (1) 8 0F1570 1 BODY CARBURETOR AS ...
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Generac Power Systems 20 - page 46
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Generac Power Systems 20 - page 47
(1) 1 0G3337 1 R OOF 1.6L C1 (1) 2 0G3336 1 R EAR INTAKE W RAP 1.6L C1 (2) 3 077992 16 NUT HEX L OCK M6-1.0 SS NY INS (1) 4 0G3341 2 R IGHT SIDE DOO R 1.6L C1 (1) 5 0G3335 1 F RONT DISCHA RGE WRAP 1.6L C1 6 0F4 487A 1 ASSY ACCESS COVER 7 022127 1 NUT HEX 1/4-20 STEEL 8 022097 1 WASHE R LOCK M6-1/ 4 9 022473 1 WASHE R FLAT 1/4-M6 ZI NC 10 0C2454 16 ...
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Generac Power Systems 20 - page 49
1 0F7366 1 M UFFLER C1 2 0F7647 1 M UFFLER SADDLE 3 0F8095 1 P IPE EXHAUST O UTLET 4 0G3576 1 EX HAUST PIPE L OWER 1.6L 5 0E3257 4 S CREW HWHTF M 6-1.0 X 1 6 6 0F7644 2 M UFFLER STR AP 7 0C6119 1 BOLT U 5/16-1 8 X 2-1/4 8 036434 3 BOLT U 5/16- 18 X 2.09 9 036449 3 SADDLE 2 I NCH 10 0221 29 6 WASHER LO CK M8-5/16 11 0222 59 6 NUT HEX 5/ 16-18 STEEL ...
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