Generac Power Systems 10 kW LP Repair Manual
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Generac Power Systems 10 kW LP Repair Manual

Automatic standby generators
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See also: Owner's Manual , Installation & Owner's Manual
diagnostic
repair
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air-cooled Product
MODELS:
7 kW NG, 8 kW LP
9 kW NG, 10 kW LP
13 kW NG, 14 kW LP
16 kW NG, 17 kW LP
18 kW NG, 20 kW LP
a u t o m a t i c s t a n d b y g e n e r a t o r s

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Summary of Contents for Generac Power Systems 10 kW LP

  • Page 1 Product MODELS: 7 kW NG, 8 kW LP 9 kW NG, 10 kW LP 13 kW NG, 14 kW LP 16 kW NG, 17 kW LP 18 kW NG, 20 kW LP a u t o m a t i c s t a n d b y g e n e r a t o r s...

  • Page 2: Electrical Formulas

    ElEctrical formulas TO FIND KILOWATTS (kW) AMPERES WATTS NO. OF ROTOR POLES FREQUENCY Frequency, No. of Rotor Poles kW (required for Motor) Motor Horsepower, Efficiency RESISTANCE VOLTS AMPERES E = VOLTS KNOWN VALUES Volts, Current, Power Factor Volts, Current kW, Volts, Power Factor Volts, Amps, Power Factor Frequency, RPM RPM, No.

  • Page 3: Table Of Contents

    contents specifications ... 4 Generator ... 4 Engine ... 5 Fuel Consumption ... 5 Mounting Dimensions ... 6 Mounting Dimensions ... 7 Major Features ... 8 Part 1 - GENEral iNformatioN ... 9 1.1 Generator Identification ... 10 Introduction ...10 1.2 Installation Basics ...
  • Page 4 Test 7 – Testing The Stator With A Vom (12-20 kW)...44 Test 8 – Test Brushless Stator...45 Test 9 – Check Capacitor ...46 Test 10 – Test DPE Winding on Brushless units ...47 Test 11 – Resistance Check Of Rotor Circuit (12-20 kW)...48 Test 12 –...
  • Page 5 Part 4 - Dc coNtrol ... 95 4.1 Description and Components ... 96 General ...96 Terminal Strip / Interconnection Terminal ...96 Circuit Board ...96 Auto-Off-Manual Switch ...96 7.5 Amp Fuse...96 Menu System Navigation ...102 4.2 Operational Analysis ... 104 Introduction ...104 Utility Source Voltage Available ...104 Initial Dropout of Utility Source Voltage ...106 Utility Voltage Dropout and...

  • Page 6: Specifications

    sPEcificatioNs Unit 8 kW Rated Max. Continuous 7,000 NG Power Capacity (Watts*) 8,000 LP Rated Voltage Rated Voltage at No-Load (NG) 220-235 Rated Max. Continuous Load Current (Amps) 120 Volts** (NG/LP) 58.3/66.6 240 Volts (NG/LP) 29.2/33.3 Main Line Circuit Breaker 35 Amp Circuits*** 50A, 240V 40A, 240V...

  • Page 7: Engine

    Model 8 kW Type of Engine GH-410 Number of Cylinders Rated Horsepower @ 3,600 rpm Displacement Cylinder Block Valve Arrangement Ignition System Recommended Spark Plug RC14YC Spark Plug Gap 0.76 mm (0.030 inch) Compression Ratio Starter Oil Capacity Including Filter Approx.

  • Page 8: Mounting Dimensions

    sPEcificatioNs [ 1 1. 8 ] 1079.5 [42.5] [27.5] [29.4] [8.2] TRANSFER SWITCH 8KW - 17KW (IF SUPPLIED) 637.6 [25.1] 731.9 [28.8] [25.3] LEFT SIDE VIEW Page 6 mountinG dimenSionS [39.3] [17.9] [20.0] TRANSFER LIFTING HOLES 4 CORNERS SWITCH 20KW (IF SUPPLIED) 76.2 [3.0] PEA GRAVEL...

  • Page 9: Mounting Dimensions

    mountinG dimenSionS AIR OUTLET FRONT OF UNIT 244.4 [9.6] RIGHT SIDE VIEW AIR INTAKE 457.2 [18.0] 250.0 575.3 [9.8] [22.7] 446.6 378.7 [17.6] [14.9] FUEL INLET - 12-20KW (1/2" NPT) 8 & 10KW (3/4" NPT) - USE SUPPLIED ADAPTER REQUIRED FUEL PRESSURE: NATURAL GAS = 5-7" WATER COLUMN LIQUID PROPANE (VAPOR) = 10-12"...

  • Page 10: Major Features

    sPEcificatioNs major FeatureS 8kW, Single Cylinder, GH-410 Engine 10kW, V-twin, GT-530 Engine (door removed) (door removed) Circuit Data Label Control Breaker Data Label Control Dipstick (see sample) Panel Dipstick (see sample) Panel Circuit Breaker Exhaust Exhaust Enclosure Enclosure Air Filter Filter Fuel Inlet Fuel Inlet...

  • Page 11: Part 1 - General Information

    Part 1 GENEral iNformatioN air-cooled, automatic standby Generators 1.1 Generator Identification ... 10 Introduction ...10 1.2 Installation Basics ... 11 Introduction ...11 Selecting A Location ...11 Grounding The Generator ...11 The Fuel Supply ...11 The Transfer Switch / Load Center ...11 Power Source And Load Lines ...13 System Control Interconnections ...13 Natural Gas Fuel Interconnections ...13...

  • Page 12: Generator Identification

    sEctioN 1.1 GENErator iDENtificatioN introduction This Diagnostic Repair Manual has been prepared especially for the purpose of familiarizing service per- sonnel with the testing, troubleshooting and repair of air-cooled, automatic standby generators. Every effort has been expended to ensure that information and instructions in the manual are both accurate and cur- rent.

  • Page 13: Installation Basics

    Part 1 GENERAL INFORMATION introduction Information in this section is provided so that the service technician will have a basic knowledge of installation requirements for home standby systems. Problems that arise are often related to poor or unau- thorized installation practices. A typical home standby electric system is shown in Figure 1 (next page).
  • Page 14 sEctioN 1.2 Part 1 GENERAL INFORMATION iNstallatioN Basics Figure 1. Typical Installation Page 12...

  • Page 15: Power Source And Load Lines

    Part 1 GENERAL INFORMATION poWer Source and load lineS The utility power supply lines, the standby (genera- tor) supply lines, and electrical load lines must all be connected to the proper terminal lugs in the transfer switch. The following rules apply: In 1-phase systems with a 2-pole transfer switch, connect the two utility source hot lines to Transfer Switch Terminal Lugs N1 and N2.

  • Page 16: Non-Prepackaged Interconnections

    Section 1.3 non-PrePackaged interconnectionS Discussion: on the current model air-cooled generators Wire 194 was changed to 15B. Wire 15B is still utilized for posi- tive voltage for the transfer relay and Wire 23 is still the control ground for transferring the generator. By follow- ing the procedures below it is possible to connect new product with Wire 15B to old or current product that still utilize Wire 194, such as an rts switch.

  • Page 17: Connect A 2008 And Later Load Center Switch To A Pre-2008 Air-Cooled Generator

    Part 1 GENERAL INFORMATION connect a 2008 and later load center SWitch to a pre-2008 air-cooled Generator. PROCEDURE: 1. Follow all instructions located in the Installation Manual that was supplied with the unit regarding mounting of the switch, junction box, and generator. note: When installing a standalone pre-2008 gen- erator, the battery charger will be located in the generator utilizing the 12 Vdc trickle charger.

  • Page 18: Preparation Before Use

    sEctioN 1.4 PrEParatioN BEforE usE General The installer must ensure that the home standby gen- erator has been properly installed. The system must be inspected carefully following installation. All appli- cable codes, standards and regulations pertaining to such installations must be strictly complied with. In addition, regulations established by the Occupational Safety and Health Administration (OSHA) must be complied with.
  • Page 19 Part 1 GENERAL INFORMATION in the selector knob and pull out to overcome spring pressure and then twist clockwise 90 degrees and allow the selector to return in once aligned with the LP (Liquid Propane) position. 6. Save this tool with the Owner's Manual. 7.

  • Page 20: Engine Oil Recommendations

    sEctioN 1.4 PrEParatioN BEforE usE Figure 5. 12/14/16/17/20 kW, GT-990/GT-999 (Airbox Cover Removed) Page 18 enGine oil recommendationS All oil should meet minimum American Petroleum FUEL SELECTION Institute (API) Service Class SJ, SL or better. Use LEVER - no special additives. Select the oil's viscosity grade “OUT”...

  • Page 21: Testing, Cleaning And Drying

    Part 1 GENERAL INFORMATION meterS Devices used to measure electrical properties are called meters. Meters are available that allow one to measure (a) AC voltage, (b) DC voltage, (c) AC frequency, and (d) resistance In ohms. The following apply: • To measure AC voltage, use an AC voltmeter. •...

  • Page 22: Measuring Current

    sEctioN 1.5 tEstiNG, clEaNiNG aND DrYiNG meaSurinG current CLAMP-ON: To read the current flow, in AMPERES, a clamp-on ammeter may be used. This type of meter indicates current flow through a conductor by measuring the strength of the magnetic field around that conductor. The meter consists essentially of a current trans- former with a split core and a rectifier type instrument connected to the secondary.

  • Page 23: Electrical Units

    Part 1 GENERAL INFORMATION Component testing may require a specific resis- tance value or a test for INFINITY or CONTINUITY. Infinity is an OPEN condition between two electrical points, which would read as no resistance on a VOM. Continuity is a closed condition between two electrical points, which would be indicated as very low resis- tance or “ZERO”...

  • Page 24: Visual Inspection

    sEctioN 1.5 tEstiNG, clEaNiNG aND DrYiNG ViSual inSpection When it becomes necessary to test or troubleshoot a generator, it is a good practice to complete a thorough visual inspection. Remove the access covers and look closely for any obvious problems. Look for the following: •...

  • Page 25: Stator Insulation Resistance Test (12-20 Kw)

    Part 1 GENERAL INFORMATION HI-POT TESTER: A “Hi-Pot” tester is shown in Figure 7. The model shown is only one of many that are commercially available. The tester shown is equipped with a voltage selector switch that permits the power supply voltage to be selected.

  • Page 26: Rotor Insulation Resistance Test (8-10 Kw)

    sEctioN 1.5 tEstiNG, clEaNiNG aND DrYiNG TESTING ALL STATOR WINDINGS TO GROUND: 1. Disconnect Stator Output Leads 11 and 44 from the generator main line circuit breaker. 2. Disconnect Stator Output Leads 2 and 6 from the capacitor located on the end of the stator assembly. 3.

  • Page 27: Engine-Generator Protective Devices

    Part 1 GENERAL INFORMATION General Standby electric power generators will often run unattended for long periods of time. Such operating parameters as (a) battery voltage, (b) engine oil pres- sure, (c) engine temperature, (d) engine operating speed, and (e) engine cranking and startup are not monitored by an operator during automatic operation.

  • Page 28: Overcrank Shutdown

    sEctioN 1.6 ENGiNE-GENErator ProtEctiVE DEVicEs oVercrank ShutdoWn This feature prevents the generator from damaging itself when it continually attempts to start and another problem, such as no fuel supply, prevents it from start- ing. The unit will crank and rest for a preset time limit. Then, it will stop cranking, and the LCD screen or the LED on the generator control panel will light indicating an overcrank failure.

  • Page 29: Operating Instructions

    Part 1 GENERAL INFORMATION control panel SYSTEM READY LOW BATTERY LOW OIL PRESSURE HIGH OIL TEMPERATURE EXERCISE OVERSPEED RPM SENSOR LOSS OVERCRANK 8 kW UNITS 10-20 kW UNITS Figure 1. Generator Control Panel AUTO-OFF-MANUAL SWITCH: Use this switch to (a) select fully automatic operation, (b) to crank and start the engine manually, and (c) to shut the unit down or to prevent automatic startup.

  • Page 30: To Select Automatic Operation

    sEctioN 1.7 oPEratiNG iNstructioNs 10-20 kW – INSTALLATION ASSISTANT: Upon first power up of the generator, the display inter- face will begin an installation assistant. The assistant will prompt the user to set the minimum settings to operate. These settings are simply: Current Date/Time and Exercise Day/Time.

  • Page 31: Automatic Operating Parameters

    Part 1 GENERAL INFORMATION introduction When the generator is installed in conjunction with a transfer switch, either manual or automatic opera- tion is possible. Manual transfer and engine startup, as well as manual shutdown and re-transfer are covered in Section 1.7. Selection of fully automatic operation is also discussed in that section.
  • Page 32 sEctioN 1.8 automatic oPEratiNG ParamEtErs load tranSFer The transfer of load when the generator is running is dependent upon the operating mode as follows: 1. Manual • Will not transfer to generator if utility is present. • Will transfer to generator if utility fails (below 65% of nominal for 10 consecutive seconds.

  • Page 33: Part 2 - Ac Generators

    Part 2 ac GENErators air-cooled, automatic standby Generators 2.1 Description and Components ... 32 Introduction ...32 Engine-Generator Drive System ...32 The AC Generator ...32 Rotor Assembly ...32 Stator Assembly ...33 Brush Holder And Brushes (12-20 kW) ...34 Other AC Generator Components ...34 2.2 Operational Analysis ...

  • Page 34: Description And Components

    sEctioN 2.1 DEscriPtioN & comPoNENts introduction The air-cooled, automatic standby system is an easy to install, fully enclosed and self-sufficient electric power system. It is designed especially for homeown- ers, but may be used in other applications as well. On occurrence of a utility power failure, this high performance system will (a) crank and start automati- cally, and (b) automatically transfer electrical loads to generator AC output.

  • Page 35: Stator Assembly

    Part 2 AC GENERATORS SLIP RINGS BEARING Figure 2. The 2-Pole Rotor Assembly 12-20 kW 8/10kW: Like the 12-20 kW rotor, the 8/10 kW 2-pole rotor must be operated at 3600 rpm to supply a 60 Hertz AC fre- quency. However, the 8/10kW rotor uses no slip rings. As the rotor rotates in the generator voltage is induced from the Excitation winding using a capacitor that is in turn excited by the rotor.

  • Page 36: Brush Holder And Brushes (12-20 Kw)

    sEctioN 2.1 DEscriPtioN & comPoNENts BruSh holder and BruSheS (12-20 kW) The brush holder is retained to the rear bearing car- rier by means of two #10-32 x 9/16 Taptite screws. A positive (+) and a negative (-) brush are retained in the brush holder, with the positive (+) brush riding on the slip ring nearest the rotor bearing.

  • Page 37: Operational Analysis

    Part 2 AC GENERATORS rotor reSidual maGnetiSm The generator revolving field (rotor) may be consid- ered to be a permanent magnet. Some “residual” magnetism is always present in the rotor. This residual magnetism is sufficient to induce a voltage into the stator AC power windings that is approximately 2-12 volts AC.

  • Page 38: Operation (8/10 Kw)

    sEctioN 2.2 oPEratioNal aNalYsis operation (8/10 kW) STARTUP: When the engine is started, residual magnetism from the rotor induces a voltage into (a) the stator AC power windings, and (b) the stator excitation or DPE windings. The capacitor on the DPE winding will be charged and then will discharge causing a voltage to be induced back into the rotor.

  • Page 39: Troubleshooting Flowcharts

    Part 2 AC GENERATORS Use the “Flow Charts” in conjunction with the detailed instructions in Section 2.4. Test numbers used in the flow charts correspond to the numbered tests in Section 2.4. Problem 1 - Generator Produces Zero Voltage or Residual Voltage TEST 1 - CHECK MAIN CIRCUIT BREAKER...

  • Page 40: Problem 2 - Generator Produces Zero Voltage Or Residual Voltage (8/10 Kw)

    sEctioN 2.3 trouBlEsHootiNG floWcHarts Problem 1 - Generator Produces Zero Voltage or Residual Voltage TEST 13 - TEST ROTOR ASSEMBLY GOOD PERFORM ROTOR INSULATION RESISTANCE TEST - SECTION 1.4 GOOD TEST 7 - TEST STATOR GOOD PERFORM STATOR INSULATION RESISTANCE TEST - SECTION 1.4 GOOD Problem 2 - Generator Produces Zero Voltage or Residual Voltage...

  • Page 41: Problem 3 - Generator Produces Low Voltage At No-Load

    Part 2 AC GENERATORS Problem 3 - Generator Produces Low Voltage at No-Load TEST 2 - CHECK TEST 14 - CHECK AC OUTPUT AC OUTPUT VOLTAGE FREQUENCY NO VOLTAGE 12-20 kW UNITS GO TO TEST 4 GO TO “PROBLEM 2” 8/10 kW UNITS TEST 9 - 8/10 kW UNITS...

  • Page 42: Problem 5 - Voltage And Frequency Drop Excessively When Loads Are Applied

    sEctioN 2.3 trouBlEsHootiNG floWcHarts Problem 4 - Voltage and Frequency Drop Excessively When Loads Are Applied TEST 18 - CHECK BOTH VOLTAGE AND FREQUENCY UNDER LOAD GOOD DISCONTINUE TESTING REPLACE TEST 10 - TEST GOOD DPE WINDING GOOD LOOK FOR A SHORTED CONDITION IN A GOOD CONNECTED LOAD OR...

  • Page 43: Diagnostic Tests

    Part 2 AC GENERATORS introduction This section is provided to familiarize the service technician with acceptable procedures for the test- ing and evaluation of various problems that could be encountered on standby generators with air-cooled engine. Use this section of the manual in conjunction with Section 2.3, “Troubleshooting Flow Charts”.

  • Page 44: Test 4 - Fixed Excitation Test/Rotor

    sEctioN 2.4 DiaGNostic tEsts DaNGEr: usE EXtrEmE cautioN DuriNG tHis tEst. tHE GENErator Will BE ruNNiNG. HiGH aND DaNGErous VoltaGEs Will BE PrEsENt at tHE tEst tErmiNals. coNNEct mEtEr tEst clamPs to tHE HiGH VoltaGE tErmiNals WHilE tHE GENErator is sHut DoWN. staY clEar of PoWEr tErmiNals DuriNG tHE tEst.

  • Page 45: Test 5 - Wire Continuity (12-20 Kw)

    Part 2 AC GENERATORS Connect the other meter test lead to Wire 4 (still dis- connected from previous tests). Measure and record static rotor amp draw. 13. Set the AUTO-OFF-MANUAL switch to the MANUAL position. Once the engine starts, repeat Step 12. Measure and record running rotor amp draw with the engine running.

  • Page 46: Test 6 - Check Field Boost (12-20 Kw)

    sEctioN 2.4 DiaGNostic tEsts teSt 6 – check Field BooSt (12-20 kW) DISCUSSION: See “Field Boost Circuit” in Section 2.2. Field boost current (from the circuit board) is available to the rotor only while the engine is cranking. Loss of field boost output to the rotor may or may not affect power winding AC output voltage.

  • Page 47: Test 8 - Test Brushless Stator

    Part 2 AC GENERATORS 5. Turn the Main Breaker to the "ON" or CLOSED position. 6. Set a VOM to measure resistance. 7. Connect one meter test lead to Wire 11 on the load side of the main breaker. Connect the other meter test lead to Wire 22 (power winding).

  • Page 48: Test 9 - Check Capacitor

    sEctioN 2.4 DiaGNostic tEsts • An open circuit condition • A “short-to-ground” condition • A short circuit between windings note: the resistance of stator windings is very low. Some meters will not read such a low resistance, and will simply indicate continuity. recommended is a high quality, digital type meter capable of read- ing very low resistances.

  • Page 49: Test 10 - Test Dpe Winding On

    Part 2 AC GENERATORS PROCEDURE: 1. Consult the owner’s manual of the meter being used for directions on measuring capacitance. Figure 7 shows a typical meter and how to check capacitance. 2. Connect the meter leads directly across the terminals of the capacitor.

  • Page 50: Test 11 - Resistance Check Of Rotor Circuit (12-20 Kw)

    sEctioN 2.4 DiaGNostic tEsts 2. Testing for a “grounded” condition: Any resistance reading indicated the winding is grounded. 3. Testing for a “shorted” condition: Any resistance reading indicated the winding is shorted. 4. If stator tests good and wire continuity tests good, refer back to flow chart.

  • Page 51: (12-20 Kw)

    Part 2 AC GENERATORS RESULTS: 1. Repair, replace or reconnect wires as necessary. 2. Replace any damaged slip rings or brush holder. 3. Clean and polish slip rings as required. teSt 13 – teSt rotor aSSemBly (12-20 kW) DISCUSSION: A rotor having completely open windings will cause loss of excitation current flow and, as a result, generator AC output voltage will drop to “residual”...

  • Page 52: Test 16 - Check Stepper Motor Control

    sEctioN 2.4 DiaGNostic tEsts GOVERNOR SHAFT GOVERNOR CLAMP BOLT Figure 10. Engine Governor Adjustment Single Cylinder Engines PROCEDURE (8 kW UNITS WITH DUAL GOVERNOR SPRINGS): 1. Loosen the governor clamp bolt (Figure 10). 2. Hold the governor lever at its wide open throttle position, and rotate the governor shaft clockwise as far as it will go.

  • Page 53: Test 17 - Check And Adjust Voltage

    Part 2 AC GENERATORS STEPPER MOTOR PULL ARM THIS DIRECTION TO CLOSE THROTTLE Figure 11. Throttle Positions 9/10 kW Units STEPPER MOTOR PULL ARM THIS DIRECTION TO CLOSE THROTTLE STEPPER MOTOR ARM Figure 12. Throttle Positions 9/10 kW Units PULL ARM THIS DIRECTION TO CLOSE THROTTLE STEPPER MOTOR...

  • Page 54: Test 18 - Check Voltage And Frequency

    sEctioN 2.4 DiaGNostic tEsts teSt 18 – check VoltaGe and Frequency under load DISCUSSION: It is possible for the generator AC output frequency and voltage to be good at no-load, but they may drop excessively when electrical loads are applied. This condition, in which voltage and frequency drop exces- sively when loads are applied, can be caused by (a) overloading the generator, (b) loss of engine power, or...
  • Page 55 Part 2 AC GENERATORS CRIMP ON STANDARD FEMALE BLADE CONNECTORS 12 AWG WIRES 2 & 6 TO DPE WINDING CAPICITOR REMAINS CONNECTED TO GENERATOR Danger: The capacitor may need to be dis-  charged before testing. A capacitor can be discharged by crossing the terminals with a metal insulated screw driver.
  • Page 56 NotEs Page 54...

  • Page 57: Part 3 - Transfer Switch

    Part 3 traNsfEr sWitcH air-cooled, automatic standby Generators 3.1 Description and Components ...56 General Enclosure ... 56 Transfer Mechanism ... 57 Transfer Relay ... 57 Neutral Lug ... 58 Manual Transfer Handle ... 58 Terminal Block ... 58 Fuse Holder ... 59 3.2 Operational Analysis ...60 Operational Analysis ...

  • Page 58: Description And Components

    sEctioN 3.1 DEscriPtioN & comPoNENts General The “W/V-Type” transfer switch is rated 100 amps at 250 volts maximum. It is available in 2-pole configura- tion only and, for that reason, is usable with 1-phase systems only. Transfer switches do not have an intelligence sys- tem of their own.

  • Page 59: Transfer Mechanism

    Part 3 TRANSFER SWITCH tranSFer mechaniSm The 2-pole transfer mechanism consists of a pair of moveable LOAD contacts, a pair of stationary UTILITY contacts, and a pair of stationary STANDBY contacts. The load contacts can be connected to the utility contacts by a utility closing coil; or to the standby contacts by a standby closing coil.

  • Page 60: Neutral Lug

    sEctioN 3.1 DEscriPtioN & comPoNENts c. When de-energized, the relay’s normally open contacts are open and its normally-closed contacts are closed. d. The normally-closed relay contacts will deliver utility source power to the utility closing circuit of the transfer mechanism. e.

  • Page 61: Fuse Holder

    sEctioN 3.1 Part 3 TRANSFER SWITCH DEscriPtioN & comPoNENts TERMINALS 0, 15B AND 23: These terminals connect the transfer relay to the BLACK generator circuit board. See “Transfer Relay” in Section 3.1. FuSe holder The fuse holder holds three (3) fuses, designated as fuses F1, F2 and F3.

  • Page 62: Operational Analysis

    sEctioN 3.2 oPEratioNal aNalYsis Figure 1 is a schematic for a typical “W/V-Type” transfer switch. WIRE WIRE LEGEND BC-BATTERY CHARGER C1-UTILITY COIL & RECTIFIER C2-GENERATOR COIL & RECTIFIER F1,F2,F3-5A, 600V FUSE LC-CIRCUIT BREAKER (LOADS) (16 CIRCUIT SHOWN FOR REFERENCE ONLY) N-NEUTRAL SW1-AUTOMATIC TRANSFER SWITCH SW2,SW3-LIMIT SWITCHES...
  • Page 63 Part 3 TRANSFER SWITCH Figure 2 is a wiring diagram for a typical “W/V-Type” transfer switch. N1A N2A WIRE WIRE REVISION: "A" DATE: 03/07/08 0D4698-T LEGEND BC-BATTERY CHARGER C1-UTILITY COIL & RECTIFIER C2-GENERATOR COIL & RECTIFIER F1,F2,F3-5A, 600V FUSE LC-CIRCUIT BREAKER (LOADS) N-NEUTRAL SW1-AUTOMATIC TRANSFER SWITCH SW2,SW3-LIMIT SWITCHES...

  • Page 64: Utility Source Voltage Available

    sEctioN 3.2 oPEratioNal aNalYsis Figure 3 is a schematic representation of the transfer switch with utility source power available. The circuit condition may be briefly described as follows: • Utility source voltage is available to terminal lugs N1 and N2 of the transfer mechanism, transfer switch is in the UTILITY position and source voltage is available to T1, T2 and customer load.

  • Page 65: Utility Source Voltage Failure

    Part 3 TRANSFER SWITCH If utility source voltage should drop below a preset value, the generator circuit board will sense the dropout. The circuit board will then initiate generator cranking and startup after a time delay circuit times out. Figure 4 is a schematic representation of the transfer switch with generator power available, waiting to transfer. •...

  • Page 66: Transfer To Standby

    sEctioN 3.2 oPEratioNal aNalYsis 12 VDC is delivered to the transfer relay via Wire 15B and back to the circuit board via Wire 23. However, circuit board action holds the Wire 23 circuit open and the transfer relay remains de-energized. On generator startup, an “engine warm-up timer”...

  • Page 67: Transfer To Standby

    Part 3 TRANSFER SWITCH When the standby coil is energized it pulls the transfer switch mechanism to a overcenter position towards the standby power source side, the transfer switch mechanically snaps to the standby position. On closure of the main contacts to the standby power source side, limit switches SW2 and SW3 are mechanically actuated to “arm” the circuit for re- transfer to utility power source side.

  • Page 68: Utility Restored

    sEctioN 3.2 oPEratioNal aNalYsis Utility voltage is restored and is available to Terminals N1 and N2. The utility voltage is sensed by the generators circuit board. If it is above a preset value for a preset time interval a transfer back to utility power will occur. WIRE WIRE LEGEND...

  • Page 69: Utility Restored, Transfer Switch De-Energized

    Part 3 TRANSFER SWITCH utility reStored, tranSFer SWitch de-enerGized After the preset time interval expires the circuit board will open the Wire 23 circuit to ground. The transfer relay de-energizes, it’s normally closed contacts close, and utility source voltage is delivered to the utility closing coil (C1), via Wires N1A and N2A, closed Transfer Relay Contacts 1 and 7, and Limit Switch SW2.

  • Page 70: Utility Restored, Retransfer Back To Utility

    sEctioN 3.2 oPEratioNal aNalYsis utility reStored, retranSFer Back to utility As the utility coil pulls the transfer switch to an OVER CENTER position, the switch mechanically snaps to Utility. On closure of the main contacts to the utility power source side, Limit Switches SW2 and SW3 are mechanically actuated to “arm”...

  • Page 71: Transfer Switch In Utility

    Part 3 TRANSFER SWITCH When the transfer switch returns to the utility side, generator shutdown occurs after approximately one (1) minute. WIRE WIRE LEGEND BC-BATTERY CHARGER C1-UTILITY COIL & RECTIFIER C2-GENERATOR COIL & RECTIFIER F1,F2,F3-5A, 600V FUSE LC-CIRCUIT BREAKER (LOADS) (16 CIRCUIT SHOWN FOR REFERENCE ONLY) N-NEUTRAL SW1-AUTOMATIC TRANSFER SWITCH...

  • Page 72: Troubleshooting Flowcharts

    sEctioN 3.3 trouBlEsHootiNG floW cHarts introduction to trouBleShootinG The first step in troubleshooting is to correctly identify the problem. Once that is done, the cause of the an be found by performing the tests in the appropriate flow chart. Test numbers assigned in the flow charts are identical to test numbers in Section 3.4, “Diagnostic Tests.” Section 3.4 provides detailed instructions for performance of each test.

  • Page 73: During Exercise Or In Manual Mode

    Part 3 TRANSFER SWITCH Problem 8 – In Automatic Mode, Generator Starts When Loss of Utility Occurs, Generator Shuts Down When Utility Returns But There Is No Retransfer To Utility Power Generator Transfers to Standby During Excercise or in Manual Mode TEST 27 –...

  • Page 74: Problem 10 - Units Starts And Transfer Occurs When Utility Power Is On

    sEctioN 3.3 trouBlEsHootiNG floW cHarts Problem 10 – Unit Starts and Transfer Occurs When Utility Power Is On TEST 36 – CHECK N1 & N2 VOLTAGE TEST 38 – CHECK UTILITY SENSE VOLTAGE GOOD REPAIR N1/N2 OPEN WIRING BETWEEN TRANSFER SWITCH AND GENERATOR Page 72 8 kW: Green LED Flashes...

  • Page 75: Problem 11 - No Battery Charge (Pre-Packed Load Center)

    Part 3 TRANSFER SWITCH TEST 40 – CHECK BATTERY CHARGER GOOD SUPPLY VOLTAGE REPAIR OR REPLACE TEST 43 – CHECK BATTERY CHARGER GOOD SUPPLY VOLTAGE REPAIR OR REPLACE TEST 46 – CHECK BATTERY CHARGER GOOD SUPPLY VOLTAGE REPAIR OR REPLACE TEST 49 –...

  • Page 76: Diagnostic Tests

    sEctioN 3.4 DiaGNostic tEsts General Test numbers in this section correspond to the numbered tests in Section 3.3, “Troubleshooting Flow Charts”. When troubleshooting, first identify the problem. Then, perform the diagnostic tests in the sequence given in the flow charts. teSt 26 –...

  • Page 77: Test 27 - Check Manual Transfer Switch Operation

    Part 3 TRANSFER SWITCH e. Set the generator AUTO-OFF-MANUAL switch to AUTO. (1) The generator should crank and start. (2) When the generator starts, an “engine warm-up timer” should start timing. After about 15 seconds, the transfer relay should energize and transfer to the “Standby” source should occur.

  • Page 78: Test 28 - Check 23 And 15B

    sEctioN 3.4 DiaGNostic tEsts b. Actuate the operating lever down to move the load contacts against the standby contacts, i.e., load connected to the Standby source. 6. Repeat Step 5 several times. As the transfer switch operating lever is moved slight force should be needed until the lever reaches its center position.

  • Page 79: Test 29 - Test Transfer Relay Tr

    Part 3 TRANSFER SWITCH 13. Set VOM to measure DC voltage. 14. Connect the (-) negative meter test lead to Wire 0 at the terminal strip in the generator. Connect the (+) positive meter test lead to Wire 23 at the terminal strip in the generator.

  • Page 80: Test 30 - Standby Control Circuit

    sEctioN 3.4 DiaGNostic tEsts 4. Using jumper wires, connect the positive (+) post of a 12 volt battery to relay Terminal “A” and the negative (-) battery post to Relay Terminal “B”. The relay should energize and the VOM should read CONTINUITY. 5.
  • Page 81 sEctioN 3.4 Part 3 TRANSFER SWITCH DiaGNostic tEsts Figure 4. Standby Control Circuit Test Points Page 79...

  • Page 82: Test 32 - Utility Control Circuit

    sEctioN 3.4 DiaGNostic tEsts (2) Press the right arrow key until “Debug” is flashing. (3) Press “Enter”. (4) Press the right arrow key until “Outputs” is flashing. (5) Press “Enter”. (6) Digital Output 8 is Wire 23 output from the board.
  • Page 83 sEctioN 3.4 Part 3 TRANSFER SWITCH DiaGNostic tEsts Figure 7. Utility Control Circuit Test Points Page 81...

  • Page 84: Test 33 - Test Limit Switch Sw2 And Sw3

    sEctioN 3.4 DiaGNostic tEsts 5. Remove Wire N2A from the utility coil C1. 6. Turn on utility power supply to the transfer switch. a. If transfer to utility occurs, Wire 23 is grounded. Proceed to Test 31. b. If transfer to utility does not occur, proceed to Step 7.

  • Page 85: Test 35 - Check N1 And N2 Wiring

    Part 3 TRANSFER SWITCH PROCEDURE: 1. On the generator panel, set the AUTO-OFF-MANUAL switch to OFF. 2. Turn off the utility power supply to the transfer switch, using whatever means provided. 3. Remove fuses F1 and F2 from the fuse holder (see Figure 8).

  • Page 86: Test 37 - Check Utility Sensing Voltage

    sEctioN 3.4 DiaGNostic tEsts TEST POINTS Figure 9. Terminal Block Test Points teSt 37 – check utility SenSinG VoltaGe at the circuit Board DISCUSSION: If the generator starts and transfer to STANDBY occurs in the automatic mode when acceptable UTILITY source voltage is available at the terminal block, the next step is to determine if sensing voltage is reaching the printed circuit board.
  • Page 87 Part 3 TRANSFER SWITCH LEGEND BC-BATTERY CHARGER C1-UTILITY COIL & RECTIFIER C2-GENERATOR COIL & RECTIFIER F1,F2,F3-5A, 600V FUSE LC-CIRCUIT BREAKER (LOADS) (16 CIRCUIT SHOWN FOR REFERENCE ONLY) N-NEUTRAL SW1-AUTOMATIC TRANSFER SWITCH TB1-TERMINAL STRIP GENERATOR MAIN CONTROLLER 2 3 4 9 10 12 13 14 15 16 17 18 PANEL GND 0 Figure 11.

  • Page 88: Test 40 - Check Battery Charger Supply

    sEctioN 3.4 DiaGNostic tEsts 2. Test for utility source line-to-line voltage across Terminal Lugs N1 and N2 (see Figure 1). Normal utility source voltage should be indicated. RESULTS: 1. If low or no voltage is indicated, find the cause of the problem and correct.

  • Page 89: Test 43 - Check Battery Charger

    Part 3 TRANSFER SWITCH a. If 115 Ohms is measured, proceed to Step 10. b. If zero resistance or CONTINUITY is measured, connect the meter test leads across Terminals A and B on the transfer relay (TR1) c. If zero resistance is measured, a short exists. Replace TR1.
  • Page 90 sEctioN 3.4 DiaGNostic tEsts Figure 12. Test 43, 44, and 45 “RTSN Transfer Switch” Test Points. Page 88 FUSE LINE Part 3 TRANSFER SWITCH...
  • Page 91 Part 3 TRANSFER SWITCH Figure 12A. Test 43, 44, and 45 “RTSE Transfer Switch” Test Points. FUSE LINE LINE sEctioN 3.4 DiaGNostic tEsts Page 89...

  • Page 92: Test 46 - Check Battery Charger

    sEctioN 3.4 DiaGNostic tEsts 6. Measure across points G and H on the terminal strip. 12 VDC should be measured. a. If 12 VDC is measured, proceed to Step 8. b. If 12 VDC is not measured, proceed to Step 7. 7.
  • Page 93 sEctioN 3.4 Part 3 TRANSFER SWITCH DiaGNostic tEsts LINE LINE BC-00 BC-LINE Figure 13. Test 46, 47, and 48 “GenReady Load Center” Test Points. Page 91...

  • Page 94: Test 49 - Check Battery Charger

    sEctioN 3.4 DiaGNostic tEsts 3. Measure across points G and H on the terminal strip. 12VDC should be measured. a. If 12 VDC is measured, the charger should be functioning. b. If 12 VDC is not measured, proceed to Step 4. 4.
  • Page 95 Part 3 TRANSFER SWITCH CONNECTION LOAD NON-ESSENTIAL CONNECTION OUTPUT GENERATOR Figure 14. Test 49, 50, and 51 “Load Shed Transfer Switch” Test Points. DiaGNostic tEsts sEctioN 3.4 Page 93...

  • Page 96: Test 51 - Check Wire 0 And Wire 15B

    sEctioN 3.4 DiaGNostic tEsts 4. Reconnect battery charger black and red lead wires previously removed in Step 2. 5. Measure across points G and H. 13.4 VDC should be measured. a. If 13.4 VDC is not measured, replace the battery charger. b.

  • Page 97: Part 4 - Dc Control

    Part 4 Dc coNtrol air-cooled, automatic standby Generators 4.1 Description and Components ...96 General ... 96 Terminal Strip / Interconnection Terminal ... 96 Circuit Board ... 96 Auto-Off-Manual Switch ... 96 7.5 Amp Fuse ... 96 Menu System Navigation ... 102 4.2 Operational Analysis ...104 Introduction ...

  • Page 98: Description And Components

    sEctioN 4.1 DEscriPtioN aND comPoNENts General This section will familiarize the reader with the various components that make up the DC control system. Major DC control system components that will be covered include the following: • A Terminal Strip / Interconnection Terminal •...

  • Page 99: Amp Fuse

    Part 4 DC CONTROL 7.5 amp FuSe This fuse protects the circuit board against excessive current. If the fuse has blown, engine cranking and operation will not be possible. Should fuse replace- ment become necessary, use only an identical 7.5 amp replacement fuse.
  • Page 100 sEctioN 4.1 DEscriPtioN aND comPoNENts Figure 4. 8 kW Printed Circuit Boards and J1 Connector WirE circuit fuNctioN J1-1 High temperature shutdown: Shutdown occurs when Wire 85 is grounded by contact closure in HTO J1-2 Low oil pressure shutdown: Shutdown occurs when Wire 86 is grounded by loss of oil pressure to the LOP J1-3...
  • Page 101 Part 4 DC CONTROL (STEPPER MOTOR) REMOTE WIRELESS CONNECTION Figure 5. 10 kW Printed Circuit Board and J1 Connector WirE circuit fuNctioN J1-1 High temperature shutdown: Shutdown occurs when Wire 85 is grounded by contact closure in HTO J1-2 Low oil pressure shutdown: Shutdown occurs when Wire 86 is grounded by loss of oil pressure to the LOP J1-3...
  • Page 102 sEctioN 4.1 DEscriPtioN aND comPoNENts (STEPPER MOTOR) REMOTE WIRELESS CONNECTION Figure 6. 12/14 kW Printed Circuit Board and J1 Connector WirE circuit fuNctioN J1-1 High temperature shutdown: Shutdown occurs when Wire 85 is grounded by contact closure in HTO J1-2 Low oil pressure shutdown: Shutdown occurs when Wire 86 is grounded by loss of oil pressure to the LOP...
  • Page 103 Part 4 DC CONTROL (STEPPER MOTOR) REMOTE WIRELESS CONNECTION Figure 7. 16, 17 and 20 kW Printed Circuit Board and J1 Connector 16, 17 and 20 kW J1 connector Pin Descriptions WirE circuit fuNctioN J1-1 High temperature shutdown: Shutdown occurs when Wire 85 is grounded by contact closure in HTO J1-2 Low oil pressure shutdown: Shutdown...

  • Page 104: Menu System Navigation

    sEctioN 4.1 DEscriPtioN aND comPoNENts Figure 8. Choke Solenoid Connector Pin Number Identification menu SyStem naViGation To get to the MENU, use the "Esc" key from any page. It may need to be pressed many times before getting to the menu page. The currently selected menu is displayed as a flashing word.
  • Page 105 sEctioN 4.1 Part 4 DC CONTROL DEscriPtioN aND comPoNENts Page 103...

  • Page 106: Operational Analysis

    sEctioN 4.2 oPEratioNal aNalYsis This “Operational Analysis” is intended to familiarize the service technician with the operation of the DC control system on units with air-cooled engine. A thorough understanding of how the system works is essential to sound and logical troubleshooting. The DC control system illustrations on the following pages represent a 14 kW unit. See Figure 1, below.
  • Page 107 Part 4 DC CONTROL • Utility source voltage is available to transfer switch Terminal Lugs N1/N2. With the transfer switch main contacts at their “Utility” side, this source voltage is available to Terminal Lugs T1/T2 and to the “Load” circuits. •...

  • Page 108: Initial Dropout Of Utility Source Voltage

    sEctioN 4.2 oPEratioNal aNalYsis initial dropout oF utility Source VoltaGe Refer to Figure 2, below. Should a “Utility” power source failure occur, circuit condition may be briefly described as follows: • The circuit board constantly senses for an acceptable “Utility” source voltage, via transfer switch fuses F1/F2, transfer switch UTILITY 1 and UTILITY 2 terminals, connected wiring, control panel UTILITY 1 and UTILITY 2 terminals, and Wires N1/N2.
  • Page 109 Part 4 DC CONTROL • Should utility voltage drop below approximately 65 percent of the nominal source voltage, a programmable timer on the circuit board will turn on. • In Figure 2, the 10-second timer is still timing and engine cranking has not yet begun. •...

  • Page 110: Utility Voltage Dropout And Engine Cranking

    sEctioN 4.2 oPEratioNal aNalYsis utility VoltaGe dropout and enGine crankinG • After ten (10) seconds and when the circuit board’s 10-second timer has timed out, if utility voltage is still below 65 percent of nominal, circuit board action will energize the circuit board’s crank and run relays simultaneously. •...
  • Page 111 Part 4 DC CONTROL • Printed circuit board action delivers 12 volts DC to the fuel solenoids (FS1 & FS2), via Wire 14. The fuel solenoids energize open and fuel is available to the engine. Wire 14 supplies power to the choke solenoid (CS). Circuit board action grounds Wire 90, energizing the choke solenoid cyclically during cranking and continuously while running.

  • Page 112: Engine Startup And Running

    sEctioN 4.2 oPEratioNal aNalYsis With the fuel solenoids open and ignition occurring, the engine starts. Engine startup and running may be briefly described as follows: • Voltage pulses from the ignition magnetos are delivered to the circuit board via Wire 18. Once the circuit board determines that the engine is running, the circuit board (a) terminates cranking, and (b) terminates the choke solenoid (CS), and (c) turns on an “engine warm-up timer”.
  • Page 113 Part 4 DC CONTROL • The “engine warm-up timer” will run for about 5 seconds. When this timer finishes timing, board action will initiate transfer to the STANDBY power source. As shown in Figure 4 (below), the timer is still running and transfer has not yet occurred.

  • Page 114: Initial Transfer To The "Standby" Source

    sEctioN 4.2 oPEratioNal aNalYsis initial tranSFer to the “StandBy” Source The generator is running, the circuit board’s “engine warm-up timer” is timing, and generator AC output is avail- able to transfer switch terminal lugs E1 and E2 and to the open contacts on the transfer relay. Initial transfer to the STANDBY power supply may be briefly described as follows: •...
  • Page 115 Part 4 DC CONTROL • When the circuit board’s “engine warm-up timer” times out, circuit board action completes the Wire 23 circuit to ground. The transfer relay then energizes and its normally open contacts close. • Standby power is now delivered to the standby closing coil (C2), via Wires E1/E2, the normally open transfer relay contacts, Wire 205, limit switch XB1, Wire B, and a bridge rectifier.

  • Page 116: Utility Voltage Restored / Re-Transfer To Utility

    sEctioN 4.2 oPEratioNal aNalYsis utility VoltaGe reStored / re-tranSFer to utility The “Load” is powered by the standby power supply. The circuit board continues to seek an acceptable utility source voltage. On restoration of utility source voltage, the following events will occur: •...
  • Page 117 Part 4 DC CONTROL • The utility closing coil (C1) energizes and moves the main current carrying contacts to their NEUTRAL position. The main contacts move to an over center position past NEUTRAL and spring force closes them to their UTILITY side. LOAD terminals are now powered by the UTILITY source. •...

  • Page 118: Engine Shutdown

    sEctioN 4.2 oPEratioNal aNalYsis Following retransfer back to the utility source, an “engine cool-down timer” on the circuit board starts timing. When that timer has timed out (approximately one minute), circuit board action will de-energize the circuit board’s run relay. The following events will then occur: •...
  • Page 119 Part 4 DC CONTROL • Circuit board action will connect the engine’s ignition magnetos (IM1 & IM2) to ground, via Wire 18. Ignition will be terminated. • Without fuel flow and without ignition, the engine will shut down. Figure 7. circuit condition - retransfer to “utility” and engine Shutdown CONTROLLER DISPLAY Ready to Run GOVERNOR...

  • Page 120: Troubleshooting Flowcharts

    sEctioN 4.3 trouBlEsHootiNG floW cHarts Problem 15 – Engine Will Not Crank When Utility Power Source Fails *8 kW system ready light will be flashing VERIFY UTILITY SOURCE IS “OFF”* TURN “OFF” - RETEST REPLACE CONTROLLER ASSEMBLY REPLACE CONTROLLER Problem 16 – Engine Will Not Crank When AUTO-OFF-MANUAL Switch is Set to “MANUAL” *8 kW - battery led should be off TEST 60 –...

  • Page 121: Problem 17 - Engine Cranks But Won't Start

    Part 4 DC CONTROL Problem 17 – Engine Cranks but Won’t Start TEST 66 – CHECK GOOD FUEL SUPPLY AND PRESSURE REPLACE CIRCUIT BOARD FIND AND CORRECT CAUSE OF NO FUEL OR LOW PRESSURE GOOD REPAIR OR REPLACE CHECK AIR FILTER - REPLACE AS NEEDED TEST 70 –...

  • Page 122: Problem 18 - Engine Starts Hard And Runs Rough / Lacks Power / Backfires

    sEctioN 4.3 trouBlEsHootiNG floW cHarts Problem 18 – Engine Starts Hard and Runs Rough / Lacks Power / Backfires TEST 66 – CHECK FUEL SUPPLY AND GOOD PRESSURE FIND AND CORRECT CAUSE OF NO FUEL OR LOW PRESSURE TEST 70 – CHECK FOR IGNITION SPARK TEST 74 –...

  • Page 123: Problem 19 - Shutdown Alarm / Fault Occurred

    Part 4 DC CONTROL Problem 19 – Shutdown Alarm/Fault Occured CHECK FAULT LIGHTS OVERCRANK HIGH TEMP TEST 14 - CHECK OVERSPEED AC OUTPUT FREQUENCY TEST 78 – CHECK NO RPM WIRE 18 SENSE CONTINUITY REPAIR OR REPLACE NO SIGNAL TEST 75 – CHECK OIL PRESSURE SWITCH LOW OIL PROCEED TO PROBLEMS 10-13...

  • Page 124: Problem 20 - 7.5 Amp Fuse (F1) Blown

    sEctioN 4.3 trouBlEsHootiNG floW cHarts Problem 20 – 7.5 Amp Fuse (F1) Blown FUSE BLOWS WHEN PLACED IN “AUTO” OR “MANUAL” Problem 21 – Generator Will Not Exercise Problem 22 – No Low Speed Exercise TEST 81 - CHECK TO SEE IF LOW SPEED FUNCTION IS ENABLED ENABLED...

  • Page 125: Diagnostic Tests

    Part 4 DC CONTROL introduction Perform these “Diagnostic Tests” in conjunction with the “Troubleshooting Flow Charts” of Section 4.3. The test procedures and methods presented in this section are not exhaustive. The manufacturer could not possibly know of, evaluate and advise the service trade of all conceivable ways in which testing and trouble diagnosis might be performed.

  • Page 126: Test 59 - Test Auto Operations

    sEctioN 4.4 DiaGNostic tEsts INPUT 7 Figure 2. The Home Page, Debug and Input Screens 5. With the Inputs Screen displayed place the AUTO-OFF- MANUAL switch to the MANUAL Position. If the control- ler reads an input from the switch input 8 will change from “0”...
  • Page 127 Part 4 DC CONTROL B. pe r fo r m a l o a d t e s t o n t h e B a t t e r y : (maintenance Free Battery) 1. Using a lead acid battery load tester test the load capability of the battery.

  • Page 128: Test 62 - Check Wire 56 Voltage

    sEctioN 4.4 DiaGNostic tEsts teSt 62 – check Wire 56 VoltaGe DISCUSSION: During an automatic start or when starting manually, a crank relay on the circuit board should energize. Each time the crank relay energizes, the circuit board should deliver 12 VDC to a starter contactor relay (SCR), or starter contactor (SC), and the engine should crank.

  • Page 129: Test 64 - Test Starter Contactor

    Part 4 DC CONTROL PROCEDURE: 1. Set a VOM to measure DC voltage. 2. Remove Wire 13 from the Starter Contactor Relay located under the printed circuit board. 3. Connect the positive (+) meter test lead to the Wire 13 connector.

  • Page 130: Test 65 - Test Starter Motor

    sEctioN 4.4 DiaGNostic tEsts teSt 65 – teSt Starter motor CONDITIONS AFFECTING STARTER MOTOR PERFORMANCE: 1. A binding or seizing condition in the starter motor bearings. 2. A shorted, open or grounded armature. a. Shorted armature (wire insulation worn and wires touching one another).
  • Page 131 Part 4 DC CONTROL PINION Figure 13. Check Pinion Gear Operation (Single Cylinder) TOOLS FOR STARTER PERFORMANCE TEST: The following equipment may be used to complete a performance test of the starter motor: • A clamp-on ammeter. • A tachometer capable of reading up to 10,000 rpm. •...

  • Page 132: Test 66 - Check Fuel Supply And Pressure

    sEctioN 4.4 DiaGNostic tEsts STARTER CONTACTOR STARTER MOTOR TACHOMETER VISE Figure 17. Testing Starter Motor Performance teSt 66 – check Fuel Supply and preSSure DISCUSSION: The air-cooled generator was factory tested and adjusted using natural gas as a fuel. If desired, LP (propane) gas may be used.

  • Page 133: Test 67 - Check Circuit Board

    Part 4 DC CONTROL PORT 3 Figure 20 (12-20 kW) Gas Pressure Test point note: Where a primary regulator is used to estab- lish fuel inlet pressure, adjustment of that regula- tor is usually the responsibility of the fuel supplier or the fuel supply system installer.

  • Page 134: Test 68 - Check Fuel Solenoid

    sEctioN 4.4 DiaGNostic tEsts i. Set a VOM to measure resistance. j. Connect one meter test lead to Wire 14 that was disconnected in Step 3. k. Connect the other meter test lead to Wire 14 at J2-3. See Figures on Pages 92-95. l.
  • Page 135 Part 4 DC CONTROL CHOKE PLATE Figure 22. Solenoid De-Energized, Choke Closed 12-20 kW Units CHOKE PLATE Figure 23. Solenoid Energized, Choke Open 12-20 kW Units 3. Set a VOM to measure DC voltage. 4. Connect the positive (+) test lead to Wire 14 (Pin 1) of the C3 Connector going to the control panel (Female Side).

  • Page 136: Test 70 - Check For Ignition Spark

    sEctioN 4.4 DiaGNostic tEsts 2. Disconnect the C3 Connector. 3. Set a VOM to measure DC voltage. 4. Connect the positive (+) test lead to Wire 56 (Pin 1) of C3 Connector going to the control panel (Female Side) Connect the negative (-) test lead to Wire 0 (Pin 2). 5.
  • Page 137 sEctioN 4.4 Part 4 DC CONTROL DiaGNostic tEsts CHOKE VALVE IN OPEN POSITION CHOKE SOLENOID AIR BOX CHOKE VALVE IN CLOSED POSITION Figure 26. 8kW Choke Solenoid Figure 28. Checking Ignition Spark To determine if an engine miss is ignition related, connect the spark tester in series with the spark plug wire and the spark plug (Figure 29).

  • Page 138: Test 71 - Check Spark Plugs

    sEctioN 4.4 DiaGNostic tEsts Figure 29. Checking Engine Miss RESULTS: 1. If no spark or very weak spark occurs, go to Test 73. 2. If sparking occurs but engine still won’t start, go to Test 71. 3. When checking for engine miss, if sparking occurs at regular intervals but engine miss continues, go to Test 20.

  • Page 139: Test 73 - Check Shutdown Wire

    Part 4 DC CONTROL DISCUSSION: The Cylinder Leak Down Tester checks the sealing (compression) ability of the engine by measuring air leakage from the combustion chamber. Compression loss can present many different symptoms. This test is designed to detect the section of the engine where the fault lies before disassembling the engine.

  • Page 140: Test 74 - Check And Adjust

    sEctioN 4.4 DiaGNostic tEsts WIRE 18 CONNECTION Figure 32. Wire 18 Connection 10-20 kW Units 2. Depending on engine type, do the following: a. On V-twin units, remove Wire 56 from the Starter Contactor Relay (SCR). Using a jumper lead, jump 12 VDC from Wire 15B at TB1 (Customer Connection) to the terminal on the SCR from which Wire 56 was removed.
  • Page 141 Part 4 DC CONTROL PROCEDURE, ADJUSTING MAGNETO FLYWHEEL GAP: note: the air gap between the ignition magneto and the flywheel on single cylinder engines is not adjustable. proceed directly to Step 10 for single cylinder engines. For V-twin engines, proceed as follows.
  • Page 142 sEctioN 4.4 DiaGNostic tEsts RESULTS: If sparking still does not occur after adjusting the armature air gap, testing the ground wires and performing the basic flywheel test, replace the ignition magneto(s). PROCEDURE, REPLACING MAGNETOS: 1. Follow all steps of the Major Disassembly procedures that are located in Section 6.

  • Page 143: Test 75 - Check Oil Pressure Switch

    Part 4 DC CONTROL teSt 75 – check oil preSSure SWitch and Wire 86 DISCUSSION: If the oil pressure switch contacts have failed in their closed position, the engine will probably crank and start. However, shutdown will then occur within about 5 (five) seconds.

  • Page 144: Test 76 - Check High Oil

    sEctioN 4.4 DiaGNostic tEsts a. Disconnect the J1 Connector from the printed circuit board. b. Connect one test lead to Wire 86 (disconnected from LOP). Connect the other test lead to Pin Location 4 (Wire 86) of the J1 Connector at the Circuit Board (for all models).

  • Page 145: Test 78 - Check Wire 18 Continuity

    Part 4 DC CONTROL PROCEDURE: (INTAkE AND EXHAUST) Make sure that the piston is at Top Dead Center (TDC) of it’s compression stroke (both valves closed). The valve clearance should be 0.05-0.1mm (0.002-0.004 in.) cold. Check and adjust the valve to rocker arm clearance as follows: 1.

  • Page 146: Test 79 - Test Exercise Function

    sEctioN 4.4 DiaGNostic tEsts 10. Connect one meter test lead to Wire 18 removed from the stud connector. Connect the other meter test lead to a clean frame ground. INFINITY should be measured. If CONTINUITY is measured, repair or replace Wire 18 between the stud connector and the J1 Connector.
  • Page 147 Part 4 DC CONTROL PROCEDURE: 1. Set a VOM to measure resistance. 2. Disconnect the J2 Connector from the controller. 3. Connect one meter test lead to the ground terminal. Connect the other meter test lead to each of the follow- ing J2 connector pin locations.

  • Page 148: Test 81 - Check To See If Low Speed

    sEctioN 4.4 DiaGNostic tEsts d. If coil resistance was measured in CS and FS, and FS2 Wire 14 is shorted to ground between J2 connector and CS, FS, or FS2, repair or replace the shorted wire. 8. Disconnect Wire 14 from the Fuel Solenoid (FS) and Choke Solenoid (CS).

  • Page 149: Part 5 - Operational Tests

    Part 5 oPEratioNal tEsts air-cooled, automatic standby Generators 5.1 System Functional Tests ... 148 Introduction ...148 Manual Transfer Switch Operation ...148 Electrical Checks ...148 Generator Tests Under Load ...149 Checking Automatic Operation ...150 Setting The Exercise Timer ...150 taBlE of coNtENts Part titlE 5.1.

  • Page 150: System Functional Tests

    sEctioN 5.1 sYstEm fuNctioNal tEsts introduction Following home standby electric system installation and periodically thereafter, the system should be tested Functional tests of the system include the following: • Manual transfer switch operation. • System voltage tests. • Generator Tests Under Load. •...

  • Page 151: Generator Tests Under Load

    OPERATIONAL TESTS Part 5 AND ADJUSTMENTS DANGER tHE traNsfEr sWitcH is NoW ElEctri- callY “Hot”, coNtact WitH “Hot” Parts Will rEsult iN EXtrEmElY HaZarDous aND PossiBlY fatal ElEctrical sHocK. ProcEED WitH cautioN. 5. Use an accurate AC voltmeter to check utility power source voltage across transfer switch Terminals N1 and N2.

  • Page 152: Checking Automatic Operation

    sEctioN 5.1 sYstEm fuNctioNal tEsts 11. Let the generator run at full rated load for 20-30 minutes. Listen for unusual noises, vibration or other indications of abnormal operation. Check for oil leaks, evidence of overheating, etc. 12. When testing under load is complete, turn off electrical loads.

  • Page 153: Part 6 - Disassembly

    Part 6 DisassEmBlY air-cooled, automatic standby Generators 6.1 Major Disassembly ... 152 Front Engine Access ...152 Major Disassembly ...156 Torque Requirements (Unless Otherwise Specified) ...162 taBlE of coNtENts Part titlE 6.1. major Disassembly Page 151...

  • Page 154: Major Disassembly

    sEctioN 6.1 maJor DisassEmBlY Front enGine acceSS SAFETY: 1. Set the AUTO-OFF-MANUAL switch to OFF. 2. Remove the 7.5 amp main fuse. See Figure 1. 3. Remove the N1 and N2 fuse from the transfer switch. Figure 1. Remove 7.5 Amp Fuse 4.
  • Page 155 Part 6 DISASSEMBLY 4. Remove Stator Wires: Remove all wires from the voltage regulator, remove the neutral and ground wires from landing lugs, and remove N1 & N2 wires from main bea- kers. See Figure 5. 5. Remove Control Wires: Remove Wires #N1,#N2, #0, #15B, #23, GFCI Outlet, and unit status lights from the control box.
  • Page 156 sEctioN 6.1 maJor DisassEmBlY 8. Loosen side panel: Using a 10mm socket remove the two bolts from the base of the enclosure side panel. See Figure 10. 9. Unbolt enclosure side panel mounting bracket: Using a 10mm socket remove the two bolts from the enclosure side panel mounting bracket.
  • Page 157 Part 6 DISASSEMBLY Figure 14. 12. Remove Air Box: Using a 6mm allen wrench remove the four intake manifold socket head cap screws. See Figure 15. Using a 4mm allen wrench, remove the four airbox allen head shoulder bolts. While removing the airbox remove the four rubber washers.

  • Page 158: Major Disassembly

    sEctioN 6.1 maJor DisassEmBlY 14. Remove Blower Housing: Using a 4mm allen wrench remove one button head cap screw from top of blower housing. Using a 10mm socket remove one 10mm bolt from the top of the blower housing. See Figure 19. Using a 10mm socket remove four 10mm bolts from the right- side of the blower housing, (see Figure 20) and four 10mm bolts from the left-side of the blower housing.
  • Page 159 Part 6 DISASSEMBLY STATOR/ROTOR/ENGINE REMOVAL: 1. Remove Top Exhaust Enclosure Covers: Using a 10mm socket, remove the nine bolts from the exhaust top cov- ers. Remove covers. See Figure 23. Figure 23. 2. Remove Side Exhaust Enclosure Cover: Using a 10mm socket, remove the five bolts from the exhaust side cover.
  • Page 160 sEctioN 6.1 maJor DisassEmBlY Figure 27. 6. Remove Left-side enclosure: Using a 10mm ratchet wrench remove the horizontal 10mm bolt that connects the side panel to the back panel. Using a 10mm socket, remove three bolts from the base of the enclosure. See Figure 28.
  • Page 161 Part 6 DISASSEMBLY Figure 31. 9. Remove Fan: Attach a steering wheel puller to the fan using two M8 x 1.25 bolts. Remove the fan from the rotor. Figure 32. Figure 32. maJor DisassEmBlY 10. Remove Brushes: Using a 7mm socket remove brushes. See Figure 33.
  • Page 162 sEctioN 6.1 maJor DisassEmBlY 12. Remove Brush Wires: Using a side cutters remove the tie wraps securing the brush wires to the outside of sta- tor. See Figure 35. Figure 35. 13. Remove Controls Cover: Using a Torx T-27 socket remove two bolts and ground washer from the controls cover.
  • Page 163 Part 6 DISASSEMBLY Figure 39. Figure 40. Figure 41. maJor DisassEmBlY 17. Rotor Removal: Cut 2.5 inches from the rotor bolt. Slot the end of the bolt to suit a flat blade screwdriver. Slide the rotor bolt back through the rotor and use a screw- driver to screw it into the crankshaft.

  • Page 164: Torque Requirements

    sEctioN 6.1 maJor DisassEmBlY 12. Remove Engine: Using proper lifting equipment remove the engine. See Figure 44. Figure 44. Page 162 Part 6 torque requirementS (unleSS otherWiSe SpeciFied) STATOR BOLTS ... 6 ft-lbs ( +1 / -0 ) ROTOR BOLT ... 30 ft-lbs ENGINE ADAPTOR ...

  • Page 165: Part 7 - Electrical Data

    Part 7 ElEctrical Data air-cooled, automatic standby Generators taBlE of coNtENts DWG# titlE 0G7945 WiriNG DiaGram, 8 KW HsB 0G8511 scHEmatic, 8 KW HsB 0G7946 WiriNG DiaGram, 10 KW HsB 0G8512 scHEmatic, 10 KW HsB 0G7947 WiriNG DiaGram, 14 KW HsB 0G8513 scHEmatic, 14 KW HsB 0G7948...

  • Page 166: Wiring Diagram, 8 Kw Home Standby

    WiriNG DiaGram, 8 KW HomE staNDBY ENGINE COMPARTMENT CAPACITOR STATOR CHOKE SOLENOID ENGINE FRAME REVISION: -A- DATE: Page 164 2 3 4 Part 7 ELECTRICAL DATA DraWiNG #0G7945 GROUP G CONTROL PANEL N1 N2 MAIN CONTROLLER 9 10 12 13 14 15 16 17 18 PANEL GND WIRING - DIAGRAM 2008 AIR COOLED...
  • Page 167 Part 7 ELECTRICAL DATA REVISION: -A- DATE: WiriNG DiaGram, 8 KW HomE staNDBY CUSTOMER CONNECT AREA 240V GENERATOR OUTPUT TO TRANSFER SWITCH CONTACTOR LEGEND - CIRCUIT BREAKER, MAIN OUTPUT GND - GROUND HTO - HIGH TEMPERATURE SWITCH IM1 - IGNITON MODULE LOP - LOW OIL PRESSURE SWITCH - STARTER CONTACTOR - STARTER MOTOR...

  • Page 168: Schematic, 8 Kw Home Standby

    scHEmatic, 8 KW HomE staNDBY EXCITATION WINDING CAPACITOR POWER WINDING STATOR POWER WINDING REVISION: -A- DATE: Page 166 OPTIONAL BATTERY WARMER PRINTED CIRCUIT BOARD BATTERY LEGEND CB - CIRCUIT BREAKER, MAIN OUTPUT CS - CHOKE SOLENOID FS - FUEL SOLENOID HTO - HIGH TEMPERATURE SWITCH IM - IGNITION MODULE Part 7...
  • Page 169 Part 7 scHEmatic, 8 KW HomE staNDBY ELECTRICAL DATA DraWiNG #0G8511 GROUP G PAGE LEFT PLANK INTENTIONALLY SCHEMATIC - DIAGRAM REVISION: -A- 2008 AIR COOLED DRAWING #: 0G8511 DATE: Page 167...

  • Page 170: Wiring Diagram, 10 Kw Home Standby

    WiriNG DiaGram, 10 KW HomE staNDBY ENGINE COMPARTMENT CAPACITOR STATOR CHOKE SOLENOID GOVERNOR ACTUATOR ENGINE FRAME REVISION: -A- DATE: Page 168 N.C. N.C. 2 3 4 Part 7 ELECTRICAL DATA DraWiNG #0G7946 GROUP G CONTROL PANEL N1 N2 MAIN CONTROLLER 9 10 12 13 14 15 16 17 18 PANEL GND...
  • Page 171 Part 7 ELECTRICAL DATA REVISION: -A- DATE: WiriNG DiaGram, 10 KW HomE staNDBY 240V GENERATOR OUTPUT TO TRANSFER SWITCH CONTACTOR LED BOARD L1: GREEN = SYSTEM READY L3: RED = ALARM FUEL SOLENOID FUEL SOLENOID BLACK BATTERY CUSTOMER SUPPLIED DraWiNG #0G7946 GROUP G CUSTOMER CONNECT AREA LEGEND...

  • Page 172: Schematic, 10 Kw Home Standby

    scHEmatic, 10 KW HomE staNDBY EXCITATION WINDING CAPACITOR STATOR GOVERNOR ACTUATOR REVISION: -A- DATE: Page 170 POWER WINDING POWER WINDING OPTIONAL BATTERY WARMER PRINTED CIRCUIT BOARD BATTERY LEGEND CB - CIRCUIT BREAKER, MAIN OUTPUT CS - CHOKE SOLENOID FS - FUEL SOLENOID HTO - HIGH TEMPERATURE SWITCH IM_ - IGNITION MODULE Part 7...
  • Page 173 Part 7 scHEmatic, 10 KW HomE staNDBY ELECTRICAL DATA DraWiNG #0G8512 GROUP G PAGE LEFT BLANK INTENTIONALLY SCHEMATIC - DIAGRAM REVISION: -A- 2008 AIR COOLED DRAWING #: 0G8512 DATE: Page 171...

  • Page 174: Wiring Diagram, 14 Kw Home Standby

    WiriNG DiaGram, 14 KW HomE staNDBY ENGINE COMPARTMENT STATOR CLOSEST TO BEARING CHOKE SOLENOID GOVERNOR ACTUATOR ENGINE FRAME REVISION: -A- DATE: Page 172 VOLTAGE REGULATOR 2 3 4 Part 7 ELECTRICAL DATA DraWiNG #0G7947 GROUP G CONTROL PANEL N1 N2 MAIN CONTROLLER 9 10...
  • Page 175 Part 7 ELECTRICAL DATA REVISION: -A- DATE: WiriNG DiaGram, 14 KW HomE staNDBY 240V GENERATOR OUTPUT TO TRANSFER SWITCH CONTACTOR LED BOARD L1: GREEN = SYSTEM READY L3: RED = ALARM FUEL SOLENOID BLACK BATTERY CUSTOMER SUPPLIED DraWiNG #0G7947 GROUP G CUSTOMER CONNECT AREA LEGEND BA -...

  • Page 176: Schematic, 14 Kw Home Standby

    scHEmatic, 14 KW HomE staNDBY REVISION: -A- DATE: Page 174 POWER WINDING STATOR POWER WINDING Part 7 ELECTRICAL DATA DraWiNG #0G8513 GROUP G VOLTAGE REGULATOR BATTERY SCHEMATIC - DIAGRAM 2008 AIR COOLED DRAWING #: 0G8513...
  • Page 177 Part 7 ELECTRICAL DATA GOVERNOR ACTUATOR REVISION: -A- DATE: scHEmatic, 14 KW HomE staNDBY OPTIONAL BATTERY WARMER CONTROLLER PRINTED CIRCUIT BOARD LEGEND BA - BRUSH ASSEMBLY CB - CIRCUIT BREAKER, MAIN OUTPUT CS - CHOKE SOLENOID FS - FUEL SOLENOID HTO - HIGH TEMPERATURE SWITCH IM_ - IGNITION MODULE DraWiNG #0G8513...

  • Page 178: Wiring Diagram, 17 Kw Home Standby

    WiriNG DiaGram, 17 KW HomE staNDBY ENGINE COMPARTMENT STATOR CLOSEST TO BEARING CHOKE SOLENOID GOVERNOR ACTUATOR ENGINE FRAME REVISION: -A- DATE: Page 176 VOLTAGE REGULATOR 2 3 4 Part 7 ELECTRICAL DATA DraWiNG #0G7948 GROUP G CONTROL PANEL N1 N2 MAIN CONTROLLER 9 10...
  • Page 179 Part 7 ELECTRICAL DATA REVISION: -A- DATE: WiriNG DiaGram, 17 KW HomE staNDBY 240V GENERATOR OUTPUT TO TRANSFER SWITCH CONTACTOR LED BOARD L1: GREEN = SYSTEM READY L2: YELLOW = MAINTENANCE REQ'D L3: RED = ALARM FUEL SOLENOID BLACK BATTERY CUSTOMER SUPPLIED DraWiNG #0G7948 GROUP G...

  • Page 180: Schematic, 17 Kw Home Standby

    scHEmatic, 17 KW HomE staNDBY STATOR REVISION: -A- DATE: Page 178 POWER WINDING POWER WINDING Part 7 ELECTRICAL DATA DraWiNG #0G8514 GROUP G VOLTAGE REGULATOR BATTERY SCHEMATIC - DIAGRAM 2008 AIR COOLED DRAWING #: 0G8514...
  • Page 181 Part 7 ELECTRICAL DATA OPTIONAL BATTERY WARMER GOVERNOR ACTUATOR REVISION: -A- DATE: scHEmatic, 17 KW HomE staNDBY CONTROLLER PRINTED CIRCUIT BOARD LEGEND BA - BRUSH ASSEMBLY CB_- CIRCUIT BREAKER, MAIN OUTPUT CS - CHOKE SOLENOID FS - FUEL SOLENOID HTO - HIGH TEMPERATURE SWITCH IM_ - IGNITION MODULE DraWiNG #0G8514 GROUP G...

  • Page 182: Wiring Diagram, 20 Kw Home Standby

    WiriNG DiaGram, 20 KW HomE staNDBY ENGINE COMPARTMENT STATOR CLOSEST TO BEARING CHOKE SOLENOID GOVERNOR ACTUATOR ENGINE FRAME REVISION: -A- DATE: Page 180 VOLTAGE REGULATOR 2 3 4 Part 7 ELECTRICAL DATA DraWiNG #0G8186 GROUP G CONTROL PANEL N1 N2 MAIN CONTROLLER 9 10...
  • Page 183 Part 7 ELECTRICAL DATA REVISION: -A- DATE: WiriNG DiaGram, 20 KW HomE staNDBY 240V GENERATOR OUTPUT TO TRANSFER SWITCH CONTACTOR LED BOARD L1: GREEN = SYSTEM READY L2: YELLOW = MAINTENANCE REQ'D L3: RED = ALARM FUEL SOLENOID BLACK BATTERY CUSTOMER SUPPLIED DraWiNG #0G8186 GROUP G...

  • Page 184: Schematic, 20 Kw Home Standby

    scHEmatic, 20 KW HomE staNDBY REVISION: -A- DATE: Page 182 POWER WINDING STATOR POWER WINDING Part 7 ELECTRICAL DATA DraWiNG #0G8515 GROUP G VOLTAGE REGULATOR BATTERY SCHEMATIC - DIAGRAM 2008 AIR COOLED DRAWING #: 0G8515...
  • Page 185 Part 7 ELECTRICAL DATA OPTIONAL BATTERY WARMER GOVERNOR ACTUATOR REVISION: -A- DATE: scHEmatic, 20 KW HomE staNDBY CONTROLLER PRINTED CIRCUIT BOARD LEGEND BA - BRUSCH ASSEMBLY CB_ - CIRCUIT BREAKER OUTPUT CS - CHOKE SOLENOID FS - FUEL SOLENOID HTO - HIGH TEMPERATURE SWITCH IM_ - IGNITION MODULE DraWiNG #0G8515 GROUP G...

  • Page 186: Wiring Diagram, Home Standby Transfer Switch, 9/10/12/16 Circuit

    WiriNG DiaGram, HomE staNDBY traNsfEr sWitcH, 9/10/12/16 circuit ALL CIRCUIT GROUNDED CONDUCTORS NOT SHOWN FOR CLARITY 16 CIRCUIT LOAD CENTER 14 CIRCUIT LOAD CENTER 12 CIRCUIT LOAD CENTER 10 CIRCUIT LOAD CENTER 8 CIRCUIT LOAD CENTER REVISION: "A" DATE: 03/07/08 Page 184 Part 7 ELECTRICAL DATA...
  • Page 187 Part 7 ELECTRICAL DATA N1A N2A F1 F2 F3 WIRE WIRE 0D4698-T REVISION: "A" DATE: 03/07/08 WiriNG DiaGram, HomE staNDBY traNsfEr sWitcH, 9/10/12/16 circuit LEGEND BC-BATTERY CHARGER C1-UTILITY COIL & RECTIFIER C2-GENERATOR COIL & RECTIFIER F1,F2,F3-5A, 600V FUSE LC-CIRCUIT BREAKER (LOADS) (16 CIRCUIT SHOWN FOR REFERENCE ONLY) N-NEUTRAL SW1-AUTOMATIC TRANSFER SWITCH...

  • Page 188: Schematic, Home Standby Transfer Switch, 9/10/12/16 Circuit

    scHEmatic, HomE staNDBY traNsfEr sWitcH, 9/10/12/16 circuit WIRE WIRE LEGEND BC-BATTERY CHARGER C1-UTILITY COIL & RECTIFIER C2-GENERATOR COIL & RECTIFIER F1,F2,F3-5A, 600V FUSE LC-CIRCUIT BREAKER (LOADS) (16 CIRCUIT SHOWN FOR REFERENCE ONLY) N-NEUTRAL SW1-AUTOMATIC TRANSFER SWITCH SW2,SW3-LIMIT SWITCHES TB1-TERMINAL STRIP TR1-TRANSFER RELAY REVISION: "A"...
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  • Page 192 Generac Power Systems, Inc. Highway 59 & Hillside Rd. P .O. Box 8 Waukesha, WI 53187 1-888-GENERAC MyGenerac.com ©2008 Generac Power Systems, Inc. All rights reserved. Specifications are subject to change without notice. Part No. 0G9266 rev. A / Printed in USA 09.08...

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