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Generac 20kW - 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 QT 1.5L 20kW Models — CAUTION — ONL Y QU ALIFIED ELECTRICIANS OR CONTRA CT ORS SHOULD A TTEMPT INST ALLA TION! DEADL Y EXHA UST FUMES. OUTDOOR INST ALLA TION ONL Y! CENTURION CENTURION C E N T U R ...
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Generac 20kW - 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 20kW - 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 20kW - 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 20kW - 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 20kW - page 6
I DENTIF ICA TION R E C OR D 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 ...
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Generac 20kW - 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 20kW - page 8
ENGI NE P RO TE CTIVE 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 20kW - 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 20kW - page 10
SP E CIF 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 20kW - 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 ONF IGU RI NG TH E FU EL SY S TEM NOTE: All models are configured for natural gas or LP vapor from the factory . T o reconfi ...
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Generac 20kW - page 12
GEN ERA T OR A C LEAD C ON NECTIONS 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 A C 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 q ...
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Generac 20kW - page 13
I NS T ALLA TION Refer to the separate “Installation Guide QT Product Line” supplied with the unit. P REP AR A TION BEFOR 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 ...
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Generac 20kW - page 14
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 switched OFF . P REP AR A TION FOR ST ART -UP • Ensure that the 120V AC circuit breaker to the bat - tery charger is open. • Remove the fuse from the the ...
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Generac 20kW - page 15
GEN ERA T OR C ONTROL AN D OP ERA TION Refer to the appropriate control panel operator’s manual for this unit. OP ERA TI NG U N IT WITH MAN U AL TR ANSFER 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 20kW - page 16
MAI NTENANCE PER FOR M ED B Y AUTHOR IZED SERVICE F ACILITI ES 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 conditio ...
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Generac 20kW - page 17
Figure 10.1 - Oil Dipstick and Oil Fill Cap OIL FILL CAP OIL DIPSTIC K 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 coo ...
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Generac 20kW - page 18
CHANGI NG ENGIN E OIL Refer to maintenance performed by authorized 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 DRA ...
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Generac 20kW - page 19
M IS CELLAN EOUS MAINTENANCE CLEAN ING TH E GENER 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 or dr ...
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Generac 20kW - page 20
SERVICE S CH EDULE 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 application ...
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Generac 20kW - 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) 1. Disable the unit from operating per the f ...
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Generac 20kW - 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 Initials) Break-in Initials) annually Initials) Annually Initials) 13. Initiate an automatic star t and transf ...
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Generac 20kW - page 23
TROU BLESHOO TI NG GU IDE P ROBLEM CAUSE C OR RECTION Engine won’t crank. 1. 15 amp fuse blown. 1. Replace fuse. 2. Loose or corroded or defectiv e 2. Tighten, clean or replace batter y cab les. battery cables as necessary . 3. Defectiv e star ter contactor . 3. Replace contactor .* 4. Defectiv e star ter motor . 4. Replace star ter motor .* 5. D ...
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Generac 20kW - page 24
Standby Generator Sets Notes ...
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Generac 20kW - page 25
Standby Generator Sets Notes ...
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Generac 20kW - page 26
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Generac 20kW - page 27
1 0F71 35 1 BREA KER TR AY BA CK/BO TTOM 2 0F70 22 1 SUPP ORT CO NTROL P ANEL SIDE R H 3 0F70 21 1 SUPP ORT CO NTROL P ANEL SIDE L H 4 0F7260 1 COVE R CI RC UIT BREA KE R 2P 0F71 36 1 COVER CI RC UIT BREA KE R 3P 5 0F6156 1 PLATE WIRE S NGL GALV 6 0F44 64 1 DECA L CUS T CO NN 120V UTILIT Y 7 0D469 8 RE F BLO CK TE RM 20A 6 X 3 X 1100V 8 0F38 24 1 D ...
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Generac 20kW - page 28
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Generac 20kW - page 29
1 098675 1 ASS Y R OTOR 20K W 2 0A5336A 1 HOUSING BLOWER 3 0A16 59 1 SCRE EN AIR O UTLE T 4 020746 4 SCR EW PPHM M5 -0 .8 X 8 ZINC 5 04922 6 4 WAS HER LO CK M 5 6 05171 3 4 WAS HER F LAT M 5 7 02212 9 4 WAS HER LO CK M 8-5/ 16 8 0F8 218 1 AS SY STAT OR 2 0KW 1P H A 0F82 20 1 ASSY STATOR 20KW 3P H GJK 9 0A5382 1 BEARI NG CA RR IER REAR 10 075591 1 A ...
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Generac 20kW - page 30
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Generac 20kW - page 31
1 0F34 08B 1 BATTE RY T RAY C 1 CPL 2 0F3 4 11 1 S TRAP BA TT E RY RET A INM E NT 3 02550 7 REF WASHE R SHAK EPROO F EXT 7/16 S TL 4 05264 7 RE F S CREW S HC M 10-1.5 X 25 G12.9 5 04652 6 REF WASHE R LOCK M10 6 02213 1 REF WASHE R FLAT 3/8-M 10 ZIN C 7 05033 1A REF BAT T POST COVER RE D + 8 05033 1 REF BATT P OST COV ER B L K - 9 038805 J 1 CAB LE ...
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Generac 20kW - page 32
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Generac 20kW - page 33
1 0F715 5 1 MOUNTIN G BASE 1.5L C1 CPL 2 02748 2 2 WAS HER S HAKEP ROOF EXT 5/16 S TL 3 07093 6 2 DAM PENE R VIBR ATION 4 07093 6C 2 V IB. I SO . 7 0-75 DU RO 5 03925 3 8 S CRE W HH C M 8- 1. 2 5 X 20 G8. 8 6 02214 5 12 WASHE R FL AT 5/ 16 ZINC 7 022129 12 WASH ER LOCK M8 -5/1 6 8 045771 4 NU T HEX M8-1 .25 G8 YEL CHR 9 07195 6 4 WAS HER F LAT M 8 ...
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Generac 20kW - page 34
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Generac 20kW - page 35
1 0F7 211 1 SUPPO RT R ADIATOR LH SI DE 2 0F7 2 09 1 V E NTU RI 15" DI A FAN 3 0F7 210 1 SUPPO RT RADI ATOR RH SI DE 4 0E 9837A 1 RADIA TOR 2 .5L CPL 5 0E 1936 1 FAN CO OLI NG 15" 6 02 2129 1 WASHE R LOCK M8- 5/16 7 0F7 166 1 RADIA TOR HOSE LWR 1.5L C 1 CPL 8 099502 4 CLAMP H OSE #24 B1. 06-2.00 9 069860C 1 HOSE O IL DRAIN ASSY 2 1" ...
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Generac 20kW - page 36
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Generac 20kW - page 37
1 0 98290 1 ASM MOTOR ST EPPER 2 098 941 A 1 HO USIN G GO VERN OR CONN ECT OR 3 098958A 1 CONNECTOR INTERFAC E ASSEMBLY 4 098942A 1 COVER CONNECTOR HOUSING 5 0 98225 2 SCREW FHM #2 X 5/8 SELF TAP 6 0 43146 3 SCREW HHC M6-1.0 X 10 G8.8 7 0 22097 5 WASHER L OCK M6-1 /4 8 0 64526 2 SCREW TAP HWH #6-25 X 3/8 ZINC 9 0 98783 1 LEVER S TEPPER MOTOR 10 037 ...
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Generac 20kW - page 38
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Generac 20kW - page 39
1 0A4531 REF E NGINE-1.5L 2 022473 2 WASH ER F LA T 1/4 ZINC 3 * 055934 C 1 CLA MP VIN YL .5 X .406 Z 4 0A45 310 258 RE F. GASKET -EX HAUS T MA NIFOL D 5 0 A4355 1 MANIFOLD -EXHAUST 6 0E2632 1 HEAT SHIELD EXH 1.5L 7 022097 4 WASH ER LOCK M6-1/4 8 02250 7 2 SCRE W HH C 1/4- 2 0 X 1/ 2 G5 9 052212 4 SCR EW HHC M10-1.25 X 25 G8 .8 10 0 4652 6 4 WASHE ...
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Generac 20kW - page 40
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Generac 20kW - page 41
1 026812 2 ELBOW 90 D 3/4 NPT 2 075580 1 FLANGE FUEL IN L E T 3 0F 6 3 64A 1 FUEL RGL T R 1. 5L REW O RK 4 0392 53 4 SCREW HHC M 8-1.2 5 X 20 G8.8 5 0221 45 2 WASHE R FLAT 5/16 ZI NC 6 0221 29 6 WASHE R LOCK M8-5/ 16 7 045771 2 NUT HEX M8 -1.25 G8 YEL CH R 8 * 0F157 0 1 BODY CARB URET OR A SSEMBLY 9 032552 1 BARBED EL 90 5/16 X 1/8 NPT 10 029032 1 ...
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Generac 20kW - page 42
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Generac 20kW - page 43
1 0F700 3 (XX) 1 ROOF C1 CP L 2 0F700 4 (XX) 1 CORNER POS T LH SI DE C1 CPL 3 0F700 8 (XX) 1 DOOR RE AR C 1 CP L 4 0F700 5 (XX) 1 CORNER POS T RH S IDE C 1 CPL 5 0F700 7 (XX) 2 DOOR L H & R H SI DE C1 CPL 6 0F700 6 (XX) 1 DUCT F RONT DISCHA RGE C1 CPL 7 0C26 34A 1 ASSE MBLY CO VER AC CESS 8 091297 0091 1 ASSY WIRE 14AW G 13.8 " GRN/YEL 9 0 ...
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Generac 20kW - page 44
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Generac 20kW - page 45
1 0F7366 1 MUFFLER C1 2 0F7647 1 MUFFLER SADDLE 3 0F809 5 1 PIPE EXHAUST OUTL ET 4 0F7538 1 PIPE EXH INLET M UFLR SIDE 1.5L 5 0E 3257 4 S CREW HW HTF M6- 1.0 X 1 6 6 0F7644 2 MUFFLER STRAP 7 0C 611 9 1 BOLT U 5/16- 18 X 2-1 /4 8 03643 4 3 BO LT U 5/16-1 8 X 2. 09 9 036449 3 SAD DLE 2 INCH 10 02 2129 8 WASHE R LO CK M8- 5/16 11 02 2259 6 NUT HE X 5/ ...
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Generac 20kW - page 46
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Generac 20kW - page 47
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Generac 20kW - page 50
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Generac 20kW - page 52
Standby Generator Sets W arranty Printed in U.S.A. GENERA C PO WER SYSTEMS ST ANDARD LIMITED W ARRANTY FOR HOME ST ANDBY/LIGHT COMMERCIAL PRODUCT 45kW AND BELO W For a period of two (2) y ears from the date of sale, or start-up by A uthorized/Cer tified Generac P ower Systems Dealer , or branch thereof , Generac P ow er Systems, Inc. will, at its o ...
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