Generac 20kW User Manual

Serial Number

STANDBY GENERATOR

QT 1.5L 20kW Models

OWNER'S MANUAL

A new standard of reliability

CENTURION

Not intended for use in critical life support applications.

— CAUTION —

ONLY QUALIFIED ELECTRICIANS OR CONTRACTORS SHOULD ATTEMPT INSTALLATION!

DEADLY EXHAUST FUMES. OUTDOOR INSTALLATION ONLY!

This manual should remain with the unit.

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Table of Contents

SECTION	PAGE
SAFETY RULES................................................	1-1
INTRODUCTION .....................................................	1-3
Read this Manual Thoroughly...................................	1-3
Operation and Maintenance......................................	1-3
How to Obtain Service ..............................................	1-3
IDENTIFICATION RECORD.....................................	2-1
Data Label ................................................................	2-1
EQUIPMENT DESCRIPTION ...................................	3-1
Equipment Description ................................................	3-1
Engine Oil Recommendations ......................................	3-1
Coolant Recommendations...........................................	3-1
ENGINE PROTECTIVE DEVICES ............................	4-1
High Coolant Temperature Switch ............................	4-1
Low Coolant Level Sensor.........................................	4-1
Low Oil Pressure Switch...........................................	4-1
Overcrank Shutdown................................................	4-1
Overspeed Shutdown................................................	4-1
RPM Sensor Loss Shutdown.....................................	4-1
DC Fuse ....................................................................	4-1
FUEL SYSTEMS .....................................................	5-1
Fuel Requirements....................................................	5-1
Natural Gas Fuel System ..........................................	5-1
Propane Vapor Withdrawal Fuel System....................	5-1
LP Fuel System .........................................................	5-1
SPECIFICATIONS ...................................................	6-1
Generator .................................................................	6-1
Engine.......................................................................	6-1
Cooling System .........................................................	6-1
Fuel System ..............................................................	6-1
Electrical System ......................................................	6-1
Cold Weather Kit.......................................................	6-2
Reconfiguring the Fuel System..................................	6-2
GENERAL INFORMATION.......................................	7-1
Generator AC Lead Connections ..................................	7-1
Four-lead, Single-phase Stator..................................	7-1
Alternator Power Winding Connections ........................	7-1
3-phase Alternators ..................................................	7-1
INSTALLATION.......................................................	8-1
Installation ...................................................................	8-1
Preparation Before Start-up .........................................	8-1
Transfer Switch ........................................................	8-1
Fuel System ..............................................................	8-1
Generator Set Lubrication ........................................	8-1
Prior to Initial Start-up .............................................	8-1
Engine Coolant .........................................................	8-1
Belt Tension..............................................................	8-1
Electrical System ......................................................	8-1
Initial Inspection for QT Genset Start-up .....................	8-1
Start-up Checklist ........................................................	8-2
Preparation for Start-up............................................	8-2
Start-up Inspection ...................................................	8-2

OPERATION ...........................................................	9-1
Generator Control and Operation ................................	9-1
Operating Unit with Manual Transfer Switch...............	9-1
Engine Start-up and Transfer ...................................	9-1
Retransfer and Shutdown.........................................	9-1
Operating Unit with Automatic Transfer Switch...........	9-1
MAINTENANCE.....................................................	10-1
Maintenance Performed by Authorized
Service Facilities .....................................................	10-1
Every Three Months ...............................................	10-1
Once Every Six Months...........................................	10-1
Once Annually.........................................................	10-1
First 100 Operating Hours......................................	10-1
Every 500 Operating Hours ....................................	10-1
Every 800 Operating Hours ....................................	10-1
Exhaust Manifold Procedure......................................	10-1
Intake Manifold Procedure.........................................	10-1
Cylinder Head Procedure ...........................................	10-1
Cooling System ..........................................................	10-2
Overload Protection for Engine DC
Electrical System ....................................................	10-2
Checking Fluid Levels ................................................	10-2
Check Engine Oil ....................................................	10-2
Battery Fluid...........................................................	10-2
Engine Coolant .......................................................	10-2
Maintenance Owner/Operator Can Perform................	10-3
Check Engine Oil Level ...........................................	10-3
Check Battery .........................................................	10-3
Exercise System......................................................	10-3
Inspect Cooling System...........................................	10-3
Check Engine Coolant Level....................................	10-3
Perform Visual Inspection.......................................	10-3
Inspect Exhaust System..........................................	10-3
Check Fan Belt........................................................	10-3
Inspect Engine Governor ........................................	10-3
Changing Engine Oil ...............................................	10-3
Changing the Engine Air Cleaner ............................	10-3
Spark Plugs ............................................................	10-4
Coolant Change.......................................................	10-4
Miscellaneous Maintenance........................................	10-4
Cleaning the Generator ...........................................	10-4
Battery ....................................................................	10-4
Battery Maintenance ...............................................	10-4
Battery Replacement...............................................	10-5
SERVICE SCHEDULE ...........................................	11-1
TROUBLESHOOTING ...........................................	12-1
Troubleshooting Guide...............................................	12-1
NOTES
EXPLODED VIEWS & PARTS LISTS
WIRING DIAGRAMS & SCHEMATICS
WARRANTY

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Important Safety Instructions

SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe operation be copied and posted in potential hazard areas. Safety should be stressed to all operators, potential operators, and service and repair technicians for this equipment.

WARNING:

The engine exhaust from this product contains chemicals known to the state

of California to cause cancer, birth defects or other reproductive harm.

	WARNING:
This product contains or emits chemicals
known to the state of California to cause
cancer, birth defects or other reproductive harm.

Study these SAFETY RULES carefully before installing, operating or servicing this equipment. Become familiar with this Owner’s Manual and with the unit. The generator can operate safely, efficiently and reliably only if it is properly installed, operated and maintained. Many accidents are caused by failing to follow simple and fundamental rules or precautions.

The manufacturer cannot anticipate every possible circumstance that might involve a hazard. The warnings in this manual, and on tags and decals affixed to the unit are, therefore, not all inclusive. If a procedure, work method or operating technique is used that the manufacturer does not specifically recommend, ensure that it is safe for others. Also make sure the procedure, work method or operating technique utilized does not render the generator unsafe.

DANGER

Despite the safe design of this generator, operating this equipment imprudently, neglecting its maintenance or being careless can cause possible injury or death. Permit only responsible and capable persons to install, operate or maintain this equipment.

Potentially lethal voltages are generated by these machines. Ensure all steps are taken to render the machine safe before attempting to work on the generator.

Parts of the generator are rotating and/or hot during operation. Exercise care near running generators.

GENERAL HAZARDS

•For safety reasons, the manufacturer recommends that this equipment be installed, serviced and repaired by an Authorized Service Dealer or other competent, qualified electrician or installation technician who is familiar with applicable codes, standards and regulations. The operator also must comply with all such codes, standards and regulations.

•Installation, operation, servicing and repair of this (and related) equipment must always comply with applicable codes, standards, laws and regulations. Adhere strictly to local, state and national electrical and building codes. Comply with regulations the Occupational Safety and Health Administration (OSHA) has established. Also, ensure that the generator is installed, operated and serviced in accordance with the manufacturer’s instructions and recommendations. Following installation, do nothing that might render the unit unsafe or in noncompliance with the aforementioned codes, standards, laws and regulations.

•The engine exhaust fumes contain carbon monoxide gas, which can be DEADLY. This dangerous gas, if breathed in sufficient concentrations, can cause unconsciousness or even death. For that reason, adequate ventilation must be provided. Exhaust gases must be piped safely away from any building or enclosure that houses the generator to an area where people, animals, etc., will not be harmed. This exhaust system must be installed properly, in strict compliance with applicable codes and standards.

•Keep hands, feet, clothing, etc., away from drive belts, fans, and other moving or hot parts. Never remove any drive belt or fan guard while the unit is operating.

•Adequate, unobstructed flow of cooling and ventilating air is critical in any room or building housing the generator to prevent buildup of explosive gases and to ensure correct generator operation. Do not alter the installation or permit even partial blockage of ventilation provisions, as this can seriously affect safe operation of the generator.

•Keep the area around the generator clean and uncluttered. Remove any materials that could become hazardous.

•When working on this equipment, remain alert at all times. Never work on the equipment when physically or mentally fatigued.

•Inspect the generator regularly, and promptly repair or replace all worn, damaged or defective parts using only factory-approved parts.

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Important Safety Instructions

•Before performing any maintenance on the generator, disconnect its battery cables to prevent accidental start-up. Disconnect the cable from the battery post indicated by a NEGATIVE, NEG or (–) first. 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 may result in dangerous operating conditions from leaking exhaust gases, fuel leakage, oil leakage, etc.

ELECTRICAL HAZARDS

•All generators covered by this manual produce dangerous electrical voltages and can cause fatal electrical shock. Utility power delivers extremely high and dangerous voltages to the transfer switch as well as the standby generator. Avoid contact with bare wires, terminals, connections, etc., on the generator as well as the transfer switch, if applicable. Ensure all appropriate covers, guards and barriers are in place before operating the generator. If work must be done around an operating unit, stand on an insulated, dry surface to reduce shock hazard.

•Do not handle any kind of electrical device while standing in water, while barefoot, or while hands or feet are wet. DANGEROUS ELECTRICAL SHOCK MAY RESULT.

•If personnel must stand on metal or concrete while installing, operating, servicing, adjusting or repairing this equipment, place insulative mats over a dry wooden platform. Work on the equipment only while standing on such insulative mats.

•The National Electrical Code (NEC) requires the frame and external electrically conductive parts of the generator to be connected to an approved earth ground. This grounding will help prevent dangerous electrical shock that might be caused by a ground fault condition in the generator set or by static electricity. Never disconnect the ground wire.

•Wire gauge sizes of electrical wiring, cables and cord sets must be adequate to handle the maximum electrical current (ampacity) to which they will be subjected.

•Before installing or servicing this (and related) equipment, make sure that all power voltage supplies are positively turned off at their source. Failure to do so will result in hazardous and possibly fatal electrical shock.

•Connecting this unit to an electrical system normally supplied by an electric utility shall be by means of a transfer switch so as to isolate the generator electric system from the electric utility distribution system when the generator is operating. Failure to isolate the two electric system power sources from each other by such means will result in damage to the generator and may also result in injury or death to utility power workers due to backfeed of electrical energy.

•Generators installed with an automatic transfer switch will crank and start automatically when normal (utility) source voltage is removed or is below an acceptable preset level. To prevent such automatic start-up and possible injury to personnel, disable the generator’s automatic start circuit (battery cables, etc.) before working on or around the unit. Then, place a “Do Not Operate” tag on the generator control panel and on the transfer switch.

•In case of accident caused by electric shock, immediately shut down the source of electrical power. If this is not possible, attempt to free the victim from the live conductor. AVOID DIRECT CONTACT WITH THE VICTIM. Use a nonconducting implement, such as a dry rope or board, to free the victim from the live conductor. If the victim is unconscious, apply first aid and get immediate medical help.

•Never wear jewelry when working on this equipment. Jewelry can conduct electricity resulting in electric shock, or may get caught in moving components causing injury.

FIRE HAZARDS

•Keep a fire extinguisher near the generator at all times. Do NOT use any carbon tetra-chloride type extinguisher. Its fumes are toxic, and the liquid can deteriorate wiring insulation. Keep the extinguisher properly charged and be familiar with its use. If there are any questions pertaining to fire extinguishers, consult the local fire department.

EXPLOSION HAZARDS

•Properly ventilate any room or building housing the generator to prevent build-up of explosive gas.

•Do not smoke around the generator. Wipe up any fuel or oil spills immediately. Ensure that no combustible materials are left in the generator compartment, or on or near the generator, as FIRE or EXPLOSION may result. Keep the area surrounding the generator clean and free from debris.

•These generator sets may operate using one of several types of fuels. All fuel types are potentially FLAMMABLE and/or EXPLOSIVE and should be handled with care. Comply with all laws regulating the storage and handling of fuels. Inspect the unit’s fuel system frequently and correct any leaks immediately. Fuel supply lines must be properly installed, purged and leak tested according to applicable fuel-gas codes before placing this equipment into service.

•Diesel fuels are highly FLAMMABLE. Gaseous fluids such as natural gas and liquid propane (LP) gas are extremely EXPLOSIVE. Natural gas is lighter than air, and LP gas is heavier than air; install leak detectors accordingly.

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Important Safety Instructions

INTRODUCTION

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 product(s) at any time without prior notice.

READ THIS MANUAL THOROUGHLY

If any portion of this manual is not understood, contact the nearest Authorized Service Dealer for starting, operating and servicing procedures.

Throughout this publication, and on tags and decals affixed to the generator, DANGER, WARNING, CAUTION and NOTE blocks are used to alert personnel to special instructions about a particular service or operation that may be hazardous if performed incorrectly or carelessly. Observe them carefully. Their definitions are as follows:

DANGER

After this heading, read instructions that, if not strictly complied with, will result in personal injury or property damage.

After this heading, read instructions that, if not strictly complied with, may result in personal injury or property damage.

After this heading, read instructions that, if not strictly complied with, could result in damage to equipment and/or property.

NOTE:

After this heading, read explanatory statements that require special emphasis.

These safety warnings cannot eliminate the hazards that they indicate. Common sense and strict compliance with the special instructions while performing the service are essential to preventing accidents.

Four commonly used safety symbols accompany the DANGER, WARNING and CAUTION blocks. The type of information each indicates is as follows:

This symbol points out important safety information that, if not followed, could endanger personal safety and/or property of others.

Thishazard.symbol points out potential explosion

This symbol points out potential fire hazard.

Thishazard.symbol points out potential electrical shock

The operator is responsible for proper and safe use of the equipment. The manufacturer strongly recommends that the operator read this Owner's Manual and thoroughly understand all instructions before using this equipment. The manufacturer also strongly recommends instructing other users to properly start and operate the unit. This prepares them if they need to operate the equipment in an emergency.

OPERATION AND MAINTENANCE

It is the operator's responsibility to perform all safety checks, to make sure that all maintenance for safe operation is performed promptly, and to have the equipment checked periodically by an Authorized Service Dealer. Normal maintenance service and replacement of parts are the responsibility of the owner/operator and, as such, are not considered defects in materials or workmanship within the terms of the warranty. Individual operating habits and usage contribute to the need for maintenance service.

Proper maintenance and care of the generator ensure a minimum number of problems and keep operating expenses at a minimum. See an Authorized Service Dealer for service aids and accessories.

Operating instructions presented in this manual assume that the standby electric system has been installed by an Authorized Service Dealer or other competent, qualified contractor. Installation of this equipment is not a “do-it-yourself” project.

HOW TO OBTAIN SERVICE

When the generator requires servicing or repairs, simply contact an Authorized Service Dealer for assistance. Service technicians are factory-trained and are capable of handling all service needs.

When contacting an Authorized Service Dealer or the factory about parts and service, always supply the complete model number of the unit as given on the front cover of this manual or on the DATA LABEL affixed to the unit.

AUTHORIZED SERVICE DEALER LOCATION

To locate the nearest AUTHORIZED SERVICE DEALER, please call this number:

1-800-333-1322

or locate us on the web at:

www.generac.com

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IDENTIFICATION RECORD

Standby Generator Sets

General Information

NOTE:

DATA LABEL

Every generator set has a DATA LABEL that contains important information pertinent to the generator. The data label, which can be found attached to the generator’s lower connection box, lists the unit’s serial number and its rated voltage, amps, wattage capacity, phase, frequency, rpm, power factor, etc.

For actual information related to this particular model, please refer to the Manual Drawing Listing located at the end of this manual, or to the data label affixed to the unit.

Generator Model and Serial Number

This number is the key to numerous engineering and manufacturing details pertaining to your unit. Always supply this number when requesting service, ordering parts or seeking information.

Data Label

	GENERATOR SET DATA	MADE IN USA
MODEL QT	SERIAL
RATED KW	RATED KVA	PHASE
RATED VOLTAGE	RATED AMPS
POWER FACTOR	HERTZ	ALT RPM
ENGINE RPM	PRODUCTION DATE
ALTERNATOR SUBTRANSIENT REACTANCE
ALTERNATOR TRANSIENT REACTANCE
CLASS ROTOR	STATOR WINDING INSULATION AT 25 C AMBIENT

GENERAC POWER SYSTEMS, INC.

WAUKESHA, WI

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Equipment Description

EQUIPMENT DESCRIPTION

This equipment is a revolving field, alternating current 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 complete with a sound attenuated enclosure, internally mounted muffler, control console, mainline circuit breaker, battery charger, and protective alarms as explained in the following paragraph.

All AC connections, including the power leads from the alternator, 120 volt battery charger input and control connections to the transfer switch are available in the main connection box.

The generator incorporates the following generator features:

•Rotor and Stator insulation is Class F rated as defined by NEMA MG1-32.6, NEMA MG1-1.66. The generator is self ventilated and drip-proof constructed.

•The voltage waveform deviation, total harmonic content of the AC waveform and telephone influence factor have been evaluated and are acceptable according to NEMA MG1-32.

ENGINE OIL RECOMMENDATIONS

The unit has been filled with 15W-40 engine oil at the factory. Use a high-quality detergent oil classified “For Service CC, SD, SE, SF.” Detergent oils keep the engine cleaner and reduce carbon deposits. Use oil having the following SAE viscosity rating, based on the ambient temperature range anticipated before the next oil change:

	Temperature	Oil Grade (Recommended)
	Above 80° F (27° C)	SAE 30W or 15W-40
	32° to 80° F (0° to 27° C)	SAE 20W-20 or 15W-40
	Below 32° F (0° C)	See Note

Any attempt to crank or start the engine before it has been properly serviced with the recommended oil may result in an engine failure.

NOTE:

COOLANT RECOMMENDATIONS

Use a mixture of half low silicate ethylene glycol base anti-freeze and deionized water. Cooling system capacity is listed in the specifications. Use only deionized water and only low silicate anti-freeze. If desired, add a high quality rust inhibitor to the recommended coolant mixture. When adding coolant, always add the recommended 50-50 mixture.

Do not use any chromate base rust inhibitor with ethylene glycol base anti-freeze or chromium hydroxide (“green slime”) forms and will cause overheating. Engines that have been operated with a chromate base rust inhibitor must be chemically cleaned before adding ethylene glycol base anti-freeze. Using any high silicate anti-freeze boosters or additives will also cause overheating. The manufacturer also recommends that any soluble oil inhibitor is NOT used for this equipment.

DANGER

Do not remove the radiator pressure cap while the engine is hot or serious burns from boiling liquid or steam could result.

Ethylene glycol base antifreeze is poisonous. Do not use mouth to siphon coolant from the radiator, recovery bottle or any container. Wash hands thoroughly after handling. Never store used antifreeze in an open container because animals are attracted to the smell and taste of antifreeze even though it is poisonous to them.

For temperatures below 32° F, it is strongly recommended to use the optional Cold Weather Start Kit (part number listed in the Specification Section). The oil grade for temperatures below 32° F is 5W30 synthetic oil.

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Engine Protective Devices

ENGINE PROTECTIVE DEVICES

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 temperature, oil pressure or rpm. For that reason, the engine has several devices designed to protect it against potentially damaging conditions by automatically shutting down the unit when the oil pressure is too low, the coolant temperature is too high, the coolant level is too low, or the engine is running too fast.

NOTE:

Engine protective switches and sensors are mentioned here for the reader’s convenience. Also refer to the applicable control panel manual for additional automatic engine shutdown information.

HIGH COOLANT TEMPERATURE SWITCH

This switches contacts close if the temperature should exceed approximately 140° C (284° F), initiating an engine shutdown. The generator will automatically restart and the LED will reset once the temperature has returned to a safe operating level.

LOW COOLANT LEVEL SENSOR

Should the engine coolant level drop below the level of the high coolant temperature switch, it is possible for the engine to overheat without automatic shutdown. To prevent such overheating, the engine has a low coolant level sensor. If the level of engine coolant drops below the level of the low coolant level sensor, the engine automatically shuts down.

OVERCRANK SHUTDOWN

After a prespecified duration of cranking, this function ends the cranking if the engine has failed to start. The overcrank LED will turn ON. Turn OFF the AUTO/OFF/MANUAL switch, then turn switch back to AUTO to reset the generator control board.

NOTE:

If the fault is not corrected, the overcrank feature will continue to activate.

Approximate Crank Cycle Times

•15 seconds ON

•7 seconds OFF

•7 seconds ON

•7 seconds OFF

•Repeat for 45 seconds Approximately 90 seconds total.

OVERSPEED SHUTDOWN

A speed circuit controls engine cranking, start-up, operation and shutdown. Engine speed signals are delivered to the circuit board whenever the unit is running. Should the engine overspeed above a safe, preset value, the circuit board initiates an automatic engine shutdown. Contact the nearest Authorized Dealer if this failure occurs.

RPM SENSOR LOSS SHUTDOWN

If the speed signal to the control panel is lost, engine shutdown will occur.

LOW OIL PRESSURE SWITCH

This switch has normally closed contacts that are held open by engine oil pressure during cranking and operating. Should oil pressure drop below the 8 psi range, switch contacts close, and the engine shuts down. The unit should not be restarted until oil is added, and the AUTO/OFF/MANUAL switch must be turned to OFF and then back to AUTO.

DC FUSE

This fuse is located inside of the control panel. It protects the panel wiring and components from damaging overload. Always remove this fuse before commencing work on the generator. The unit will not start or crank if the fuse is blown. Replace the fuse with one of the same size, type, and rating. (See the exploded views and parts lists at the end of this manual for replacement part number.)

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FUEL SYSTEM

FUEL REQUIREMENTS

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 unit.

Recommended fuels should have a Btu content of at least 1,000 Btus per cubic foot for natural gas; or at least 2,520 Btus per cubic foot for LP gas. Ask the fuel supplier for the Btu content of the fuel.

Required fuel pressure for natural gas is 5 inches to 14 inches water column (0.18 to 0.5 psi); and for liquid propane, 5 inches to 14 inches of water column (0.18 to 0.5 psi).

NOTE:

Any piping used to connect the generator to the fuel supply should be of adequate size to ensure the fuel pressure NEVER drops below five inches water column for natural gas or 5 inches water column for propane vapor for all load ranges.

NOTE:

It is the responsibility of the installer to make sure that only the correct recommended fuel is supplied to the generator fuel system. Thereafter, the owner/operator must make certain that only the proper fuel is supplied.

NATURAL GAS FUEL SYSTEM

Natural gas is supplied in its vapor state. In most cases, the gas distribution company provides piping from the main gas distribution line to the standby generator site. The following information applies to natural gas fuel systems.

•Gas pressure in a building is usually regulated by national, state and local codes.

• To reduce gas pressure to a safe level before the gas enters a building, a primary regulator is needed. The natural gas supplier may or may not supply such a regulator.

•It is the responsibility of the gas supplier to make sure sufficient gas pressure is available to operate the primary regulator.

•Gas pressure at the inlet to the fuel shutoff solenoid should not exceed approximately 14 inches water column (0.5 psi). Optimum pressure at the fuel shutoff solenoid is 11 inches water column (0.4 psi).

PROPANE VAPOR WITHDRAWAL FUEL SYSTEM

This type of system utilizes the vapors formed above the liquid fuel in the supply tank. Approximately 10 to 20 percent of the tank capacity is needed for fuel expansion from the liquid to the vapor state. The vapor withdrawal system is generally best suited for smaller engines that require less fuel. The installer should be aware of the following:

•The natural gas and LP gas systems are similar. However, the natural gas system delivers gas at a pressure of approximately five inches water column to the carburetor.

•When ambient temperatures are low and engine fuel consumption is high, the vapor withdrawal system may not function efficiently.

•Ambient temperatures around the supply tank must be high enough to sustain adequate vaporization, or the system will not deliver the needed fuel volume.

•In addition to the cooling effects of ambient air, the vaporization process itself provides an additional cooling effect.

LP FUEL SYSTEM

LP is supplied as a liquid in pressure tanks. It is usually made up of propane, butane, or a mixture of the two gases. Propane tends to vaporize readily even at temperatures as low as -20° F (-29° C). However, butane reverts to its liquid state when temperatures drop below 32° F (0° C).

LP in a liquid withdrawal system must be converted to its gaseous state before it is introduced into the engine carburetor. A vaporizer-converter is generally used to accomplish this. In such a converter, heated engine coolant is ported through the converter to provide the necessary heat for conversion of the fuel from a liquid to a gaseous state.

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Specifications

SPECIFICATIONS

GENERATOR

Type.............................................................................	Synchronous
Rotor Insulation ....................................................................	Class F
Stator Insulation ...................................................................	Class F
Total Harmonic Distortion.........................................................	< 5%
Telephone Interference Factor (TIF)..........................................	< 50
Alternator Output Leads 3-phase...........................................	4-wire
Bearings .........................................................................	Sealed Ball
Coupling .......................................................................	Flexible Disc
Load Capacity (Standby Rating) ............................................	20kW*

*NOTE: Generator rating and perfomance in accordance with ISO8528-5, BS5514, SAE J1349, ISO3046 and DIN 6271 Standards. KW rating is based on LPG fuel and may derate with natural gas.

Excitation System....................................................................			Direct
Generator Output Voltage/kW - 60 Hz	kW	Amp	CB Size
120/240V, 1-phase, 1.0 pf	20	83	100
120/208V, 3-phase, 0.8 pf	20	69	100
Generator Locked Rotor KVA Available @ Voltage Dip of 35%
Single-phase or 208 3-phase.............................................			34 KVA

ENGINE

Make...................................................................................	Generac
Model.....................................................................................	In Line
Cylinders and Arrangement............................................................	4
Displacement.......................................................................	1.5 Liter
Bore......................................................................................	2.97 in.
Stroke ...................................................................................	3.23 in.
Compression Ratio...............................................................	9.4-to-1
Air Intake System ................................................	Natually Aspirated
Valve Seats...................................................................	Replaceable
Lifter Type ..........................................................................	Hydraulic
Engine Parameters
Rated Synchronous RPM..............................................	60 Hz, 3600
HP at rated kW..................................................................	60 Hz, 32
Exhaust System
Exhaust Flow at Rated Output 60 Hz..................................	177 cfm
Exhaust Temperature at Rated Output..................................	910° F
Combustion Air Requirements (Natural Gas)
Flow at rated power, 60 Hz ...................................................	70 cfm
Governor
Type..................................................................................	Electronic
Frequency Regulation ...................................................	Isochronous
Steady State Regulation........................................................	± .25%
Adjustments:
Speed............................................................................	Selectable

Engine Lubrication System
Type of Oil Pump......................................................................	Gear
Oil Filter .............................................................	Full Flow, Cartridge
Crankcase Oil Capacity....................................................	4 U.S. qts.

COOLING SYSTEM

Type.......................................................................................	Closed
Water Pump....................................................................	Belt Driven
Fan Speed ................................................................................	2550
Fan Diameter.....................................................................	15 inches
Fan Mode ..............................................................................	Pusher
Air Flow (inlet air including alternator and
combustion air)..........................................................	1528 ft3/min.
Coolant Capacity ...........................................................	2.0 U.S. gal.
Heat Rejection to Coolant ..........................................	107,000 Btu/h
Maximum Operating Air Temp. on Radiator ..............	60° C (150° F)
Maximum Ambient Temperature................................	50° C (140° F)

FUEL SYSTEM

Type of Fuel.........................................			Natural Gas, Propane Vapor
Carburetor ......................................................................				Down Draft
Secondary Fuel Regulator .................................................				Standard
Fuel Shut-off Solenoid........................................................				Standard
Operating Fuel Pressure ......................			5 in. - 14 in. Water Column
Fuel Consumption - ft3/hr (Natural Gas/LPV)
Exercise	25%	50%	75%	100%
Cycle	Load	Load	Load	Load
60/24	124/49	188/75	250/99	515/125
ELECTRICAL SYSTEM
Battery Charge Alternator ............................................				12V, 15 Amp
Static Battery Charger............................................................				2 Amp
Recommended Battery......................................			Group 26, 525CCA
System Voltage.....................................................................				12 Volts
Voltage Regulator
Type..................................................................................				Electronic
Sensing........................................................................				Single-phase
Regulation ................................................................................				± 1%
Features .................................................			V/F Adjustable, Adjustable
		Voltage and Gain LED Indicators
Power Adjustment for Ambient Conditions
Temperature Deration
3% for every 10° C above °C .....................................................				25
1.65% for every 10° above °F		....................................................		77
Altitude Deration
1% for every 100 m above m ...................................................				182
3% for every 1000 ft. above ft.		.................................................		600
Controller ...................		R-100 (0F7380D - 240V)
			(0F7381D - 208V)

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GenSpec013.RevA09/05

Standby Generator Sets

Specifications

Figure 1 — Interconnections

Utility In

Transfer Switch

CONTROL PANEL

NEUTRAL

TO

ALTERNATOR

Gen

		N1		NEUTRAL
		N2
	GENERATOR	23
		194		4- # 14 GA
	CONNECTION
			CIRCUIT
		183		WIRES TO
	BOX		BREAKER
		178		GENERATOR
				CONNECTION
		Battery		BOX
		Charger
		Input		GROUND
		120 Volt +
		Neutral
		Grd

N1

N2

23

194

186

178

Load

Out

TO GENERATOR CONNECTION BOX

To Generator Control Panel

	FRAME RAIL
		CIRCUIT BREAKER SIZE
	KW	VOLTS	/ AMPS	LUG SIZE
	20	240 1 Ø	100	#4 to 1/0
Ground Level	20	208 3 Ø	80	#4 to 1/0
Concrete Slab	STUB-UP AREA
	See Install Dwg for
	Dimensions

COLD WEATHER KIT

For cold climates, optional cold weather kit (part number 0F6148) is recommended. The kit includes:

•Battery Warmer

•4” Junction Box with hardware

•6 qt. pack 5W-30 synthetic oil (engine)

RECONFIGURING THE FUEL SYSTEM

NOTE:

All models are configured for natural gas or LP vapor from the factory.

To reconfigure the fuel system from NG to LP, follow these steps:

1.Turn the main gas supply off.

2.Remove the carburetor fuel hose from the outlet port (Port 1) of the demand regulator (Figure 6.2).

3.Remove the brass hose fitting from the outlet port (Port 1) of the demand regulator.

4.Remove pipe plug from Port 2.

5.Install brass hose fitting into Port 2.

6.Install pipe plug into Port 1.

7.Connect carburetor gas hose to brass fitting.

8.Tighten all clamps and plugs.

9.Make sure fuel supply is of the proper pressure and type for configuration.

GenSpec013.RevA09/05

10.Reverse the procedure to convert back to natural gas.

11.The Dip switch inside the control panel must be in the LP or NG position when switching to different fuels.

Figure 6.2 — Reconfigure the Fuel System

		Port 1		Port 2
		FUEL HOSE	FUEL HOSE
	PLUG	BRASS HOSE	BRASS HOSE	PLUG
		FITTING	FITTING
		OUT	OUT
		PORT 1	PORT 2
		HOUSING	HOUSING
			PORTS
		PORTS

NG FUEL SYSTEM

LP FUEL SYSTEM

NOTE:

Port 1 is for NG only and Port 2 is for LP vapor only. No provision for dual fuel has been made.

DANGER

Serious injury or damage may occur if not configured properly. Please consult an Authorized Dealer with any questions.

6-2

Standby Generator Sets

General Information

GENERATOR AC LEAD CONNECTIONS

See “Voltage 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 connection (lower) panel should be installed according to the number of leads and the voltage/phase required for the application. If there are any questions regarding lead connection, refer to the wiring diagrams at the back of this manual.

Voltage codes apply to the type of stator assembly installed on a particular generator.

FOUR-LEAD, SINGLE-PHASE STATOR

Four-lead generators (see Figure 7.1) are designed to supply electrical loads with voltage code “A” (240V, 1-phase, 60 Hz). Electrical power is produced in the stator power windings. These windings were connected at the factory to the main circuit breaker as shown in Figure 7.1.

The rated voltage between each circuit breaker terminal is 240V. The rated voltage between each circuit breaker terminal and the neutral point 00 is 120V.

Figure 7.1 — Four-lead, Single-phase Stator

ALTERNATOR POWER WINDING CONNECTIONS

3-PHASE ALTERNATORS

The generator is designed to supply 3-phase electrical loads. Electric power is produced in the alternator power windings. These windings were connected at the factory to the main circuit breaker with a “Y” configuration as shown in Figures 7.2 and 7.3.

The rated voltage between circuit breaker terminals E1-E2, E1-E3 and E2-E3 is either 480V or 208V depending on the model.

The rated voltage between each circuit breaker terminal and the neutral point 00 is either 277V or 120V depending on the model.

Figure 7.2 — Stator Power Winding

Connections - 3-phase, 277/480V (6 Lead)

S1		E1
INTERNAL
CONNECTIONS
				L-L
S6		S4
			NEUTRAL
		S5
E3 S3			S2	E2

L-N

Figure 7.3 — Stator Power Winding

Connections - 3-phase, 120/208V (6 Lead)

E1

S1 S1

	S4		S4		L-L
				00 (NEUTRAL)
	S6		S5
S3	S6	S5		S2
E3	S3			E2
				S2

L-N

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Standby Generator Sets

Installation

INSTALLATION

PRIOR TO INITIAL START-UP

Refer to the separate “Installation Guide QT Product Line” supplied with the unit.

PREPARATION BEFORE START-UP

The instructions in this section assume that the standby generator has been properly installed, serviced, tested, adjusted and otherwise prepared for use by a competent, qualified installation contractor. Be sure to read the “Safety Rules”, as well as all other safety information in this manual, before attempting to operate this (and related) equipment.

Before starting the generator for the first time, the installer must complete the following procedures. For follow-up maintenance information and/or service intervals, please refer to the “Maintenance” section and the “Service Schedule”.

TRANSFER SWITCH

If this generator is used to supply power to any electrical system normally powered by an electric utility, the National Electrical Code requires that a transfer switch be installed. The transfer switch prevents electrical backfeed between two different electrical systems. (For additional information, see the applicable transfer switch manual for this unit.) The transfer switch, as well as the generator and other standby components, must be properly located and mounted in strict compliance with applicable codes, standards and regulations.

FUEL SYSTEM

Make sure the fuel supply system to the generator (a) delivers the correct fuel at the correct pressure and (b) is properly purged and leak tested according to code. No fuel leakage is permitted. See “Specifications” for more information.

GENERATOR SET LUBRICATION

Check the engine crankcase oil level before operating and add oil to the proper level – the dipstick “FULL” mark. Never operate the engine with the oil level below the dipstick “ADD” mark. See “Specifications” and “Engine Oil Recommendations”.

NOTE:

This engine is shipped from the manufacturer with “break-in” oil. This oil should be changed after 30 hours of operation.

Check the oil level in the generator gearbox (if so equipped) prior to initial use and at the intervals indicated by the “Service Schedule.” The recommended oil is SAE 90 gear lubricant.

Also, if the engine is equipped with a mechanical governor, make sure the governor is properly lubricated with clean engine oil.

8-1

Prior to initially starting the generator, it must be properly prepared for use. Any attempt to crank or start the engine before it has been properly serviced with the recommended types and quantities of engine fluids (oil, coolant, fuel, etc.) may result in an engine failure.

ENGINE COOLANT

Have the engine cooling system properly filled with the recommended coolant mixture. Check the system for leaks and other problems. See “Specifications” and “Coolant” sections.

BELT TENSION

Check-the engine-fan belt tension and condition prior to placing the unit into service and at recommended intervals. Belt tension is correct when a force of approximately 22 pounds (10 kg), applied midway between pulleys, deflects the belt about 3/8- to 5/8- inch (10 to 16 mm).

ELECTRICAL SYSTEM

Make sure the generator is properly connected to an approved earth ground.

Make sure the generator battery is fully charged, properly installed and interconnected, and ready for use.

Check to ensure that there are no loose electrical connections. Restrain any loose wires to keep them clear of any moving generator set components.

INITIAL INSPECTION FOR QT GENSET

STARTUP

Inspect for the following.

•Freight Damage.

•Manuals present.

•Fluid Levels ( Oil, coolant, battery, Gear Drive).

•Correct fuel piping.

•Correct muffler installation for QT50, QT70, QT100 - QT150.

•Adequate air flow, clearances and ventilation per installation drawings and applicable codes.

•Correct AC and DC wire size, connections and grounding. Control and communication wiring to/ from the transfer switch must be run in a separate conduit from the AC power leads.

•Battery charger connection to 120 VAC.

•Communication wires connected between transfer switch and generator (HTS only).

•Unit secured to pad.

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Standby Generator Sets

Installation

START-UP CHECKLIST

Before working on the generator, ensure the following:

•The AUTO/OFF/MANUAL switch is in the OFF position.

•The 120VAC supply to the battery charger is switched OFF.

PREPARATION FOR START-UP

•Ensure that the 120VAC circuit breaker to the battery charger is open.

•Remove the fuse from the the control panel. For the H-100 and R-100: Open the front door of the control box and remove the 15 Amp ATO fuse in the lower left-hand corner of the control box.

•Connect the battery cables to the battery. Attach negative battery cable last.

•Close the 120VAC circuit breaker to the battery charger.

•Measure the voltage at the battery before and after the charger is turned on.

•Verify all AC electrical connections are tight at the circuit breaker and transfer switch.

•Visually inspect entire area looking for loose paper, plastic wrappings, leaves, etc.

•Check all hoses clamps fittings for leaks or damage.

•Check all electrical plugs throughout the generator. Ensure each plug is seated correctly and fully inserted into its receptacle.

•Verify the AUTO/OFF/MANUAL switch is in OFF position.

•Open the valve to the engine fuel line.

•Bleed the fuel system of air. (necessary for long fuel lines).

•Open the generator main line circuit breaker.

•Connect a manometer to the gas line and record the static pressure. It must be as listed in the Specifications.

•Insert the fuse into the control panel.

•Move the AUTO/OFF/MANUAL switch to the manual position. The engine should now crank and start.

•Check voltage at the generator terminals.

•For 3-phase units, check phase rotation at the transfer switch terminals. The generator phase rotation must match the utility phase rotation.

•Check for coolant, fuel, oil, and exhaust leaks.

•Close the generators main line circuit breaker.

•Turn the generator set off.

•Connect the UTILITY supply to the transfer switch.

•Set the AUTO/OFF/MANUAL switch to AUTO.

•Disconnect utility power before the transfer switch.

Engine should start, transfer to load.

Run at least 15 minutes on generator power. Make certain all 3-phase loads are functioning correctly (correct phase rotation).

• Reconnect Utility power

Transfer switch will transfer back to Utility and engine will shut down within the given time parameters set up for the specific transfer switch and controller.

•Install all covers, access plates and door panels.

•Put the Owners Manual in a safe and accessible place.

•Make certain the AUTO/OFF/MANUAL switch is in the AUTO position.

START-UP INSPECTION

When a start-up is performed by an Authorized Service Dealer, a standard three-part form titled “Start-up Inspection for Standby Power Systems” (part no. 067377), should be completed by the installation technician or engineer. See page 1-3 for information on locating the nearest Authorized Service Dealer. The installer should complete the form and disseminate copies as follows:

•White copy: Mail to Generac Warranty Department, P.O. Box 340, 211 Murphy Dr., Eagle, WI 531192062.

•Pink Copy: For service file of installing dealer.

•Yellow Copy: For the customer’s records.

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8-2

Standby Generator Sets

Operation

GENERATOR CONTROL AND

OPERATION

Refer to the appropriate control panel operator’s manual for this unit.

OPERATING UNIT WITH MANUAL

TRANSFER SWITCH

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 will not provide automatic start-up and does not include an intelligence circuit.

ENGINE START-UP AND TRANSFER

For additional information, refer to the applicable control panel manual for this unit, as well as any literature pertaining to the specific transfer switch.

DANGER

The Maintenance Disconnect Switch and the AUTO/OFF/MANUAL switches (if so equipped) must be set properly, or the generator will crank and start as soon as the utility power to the transfer switch is turned off. Refer to applicable control panel and transfer switch manuals for more information.

Do not proceed until certain that utility source voltage is available to the transfer switch and the transfer switch main contacts are set to UTILITY.

Do not attempt manual operation until all power supplies to the transfer switch have been positively turned off, or extremely dangerous - possibly lethal - electrical shock will result.

Transfer switch enclosure doors should be kept closed and locked. Only authorized personnel should be allowed access to the transfer switch interior. Extremely high and dangerous voltages are present in the transfer switch.

In order to transfer load from the utility source to the generator, follow these directions:

•Turn OFF or disconnect the utility power circuit to the transfer switch, using the means provided (such as the utility source main line circuit breaker).

•Set the transfer handle to its UTILITY (NORMAL) position with load circuits connected to the utility power supply.

•Set the standby generator’s main line circuit breaker to its OFF (or OPEN) position.

•Start the generator.

Do not crank the engine continuously for longer than 30 seconds, or the heat may

damage the starter motor.

•Let engine stabilize and warm up.

•Check all applicable instrument and gauge readings. When certain that all readings are correct, move the transfer switch manual handle to its STANDBY (GENERATOR) position, i.e., load circuits supplied by the generator.

•Set the standby generator’s main line circuit breaker to its ON (or CLOSED) position.

•Load circuits are now powered by the standby generator.

RETRANSFER AND SHUTDOWN

For additional information, refer to the applicable control panel manual for this unit, as well as any literature pertaining to the specific transfer switch.

To transfer the load back to the utility power source and shut down the generator, follow these directions:

•Set the standby generator’s main line circuit breaker to its OFF (or OPEN) position.

•Manually move the transfer switch handle to its UTILITY (NORMAL) position, i.e., load circuits connected to the utility.

•Turn ON the utility power supply to the transfer switch, using the means provided (such as the utility power source main line circuit breaker).

•Let the generator run at no-load for a few minutes to stabilize internal temperatures.

•Shut down the generator.

OPERATING UNIT WITH AUTOMATIC

TRANSFER SWITCH

If the generator has been installed with an automatic transfer switch, such as an RTS, HTS, or GTS-type transfer switch, the engine may be started and stopped automatically or manually.

NOTE:

Refer to the applicable manual for your transfer switch and to “Transfer Switch Start Signal Connections”. In addition, please note the dangers under “Engine Start-up and Transfer.”

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Standby Generator Sets

Maintenance

MAINTENANCE PERFORMED BY AUTHORIZED SERVICE FACILITIES

Before working on the generator, ensure the following:

•The AUTO/OFF/MANUAL switch is in the OFF position.

•The 15A fuse has been removed from the control box.

•The 120VAC supply to the battery charger is switched OFF.

EVERY THREE MONTHS

1.Check battery condition.

2.Inspect and test fuel system.

3.Check transfer switch.

4.Inspect exhaust system.

5.Check engine ignition system.

6.Check fan belts.

ONCE EVERY SIX MONTHS

1.Test Engine Safety Devices (low oil pressure, low coolant level, high coolant temperature).

ONCE ANNUALLY

1.Test engine governor; adjust or repair, if needed.

2.Clean, inspect generator.

3.Flush cooling system.

COOLING SYSTEM

Air intake and outlet openings in the generator compartment must be open and unobstructed for continued proper operation. This includes such obstructions as high grass, weeds, brush, leaves and snow.

Without sufficient cooling and ventilating air flow, the engine/generator quickly overheats, which causes it to shut down. (See the installation diagram.)

The exhaust system parts from this product get extremely hot and remains hot after shutdown. High grass, weeds, brush, leaves, etc. must remain clear of the exhaust. Such materials may ignite and burn from the heat of the exhaust system.

OVERLOAD PROTECTION FOR ENGINE

DC ELECTRICAL SYSTEM

Engine cranking, start up and running are controlled by a solid state Engine Controller circuit board. Battery voltage is delivered to that circuit board via a 15 amp fuse. These overcurrent protection devices will open if the circuit is overloaded.

If a circuit breaker opens or a fuse element melts, find the cause of the overload before resetting the circuit breaker or replacing the fuse.

FIRST 100 OPERATING HOURS

1.Change engine oil and oil filter. After initial change, service engine oil and filter at 150 operating hours or six months, whichever comes first.

2.Retorque cylinder head.

3.Retorque intake and exhaust manifold.

EVERY 500 OPERATING HOURS

1.Service air cleaner.

2.Check starter.

3.Check engine DC alternator.

EVERY 800 OPERATING HOURS

1.Retorque cylinder head.

2.Retorque intake and exhaust manifold.

3.Check engine compression.

4.Check valve clearance.

CHECKING FLUID LEVELS

CHECK ENGINE OIL

Check engine crankcase oil level (Figure 10.1) at least every 20 hours of operation, or prior to use.

•Remove oil dipstick and wipe dry with a clean, lintfree cloth.

•Install oil dipstick, then remove again.

•Oil should be between FULL and ADD marks.

•If oil level is below the dipstick ADD mark, remove oil fill cap-. Add the recommended oil to bring oil level up to the FULL mark. DO NOT FILL ABOVE THE “FULL” MARK. See “Engine Oil Recommendations” for recommended oils.

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