Guardian 04389-2, 04390-2, 04456-2 User Manual

Installation and

Owner’s Manual

Air-cooled, Prepackaged

Automatic Standby Generators

Models: 04389-2 (6 kW NG, 7 kW LP) 04456-2 (12 kW NG, 12 kW LP) 04390-2 (13 kW NG, 15 kW LP)

DEADLY EXHAUST FUMES. OUTDOOR INSTALLATION ONLY!!

Not intended for use as Primary Power in place of utility or in

life-support applications.

GENERAC

POWER SYSTEMS, INC.

DANGER

Generac®Power Systems, Inc.

INTRODUCTION

Thank you for purchasing this model of the Guardian product line by Generac Power Systems Inc. This model is a compact, high performance, air-cooled, engine-driven generator designed to automatically supply electrical power to operate critical loads during a utility power failure.

This unit is factory installed in an all-weather, metal enclosure that is intended exclusively for outdoor installation. This generator will operate using either vapor withdrawn liquid propane (LP) or natural gas (NG).

READ THIS MANUAL THOROUGHLY

If any portion of this manual is not understood, contact Generac or the nearest Generac/Guardian Authorized 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 operation that may be hazardous if performed incorrectly or carelessly. Observe them carefully. Their definitions are as follows:

After this heading, read instructions that, if not strictly complied with, will result in serious personal injury, including death, in addition to property damage.

After this heading, read instructions that, if not strictly complied with, may result in serious 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 follows:

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

This symbol points out potential explosion hazard.

This symbol points out potential fire hazard.

This symbol points out potential electrical shock hazard.

The operator is responsible for proper and safe use of the equipment. Generac strongly recommends that the operator read this Owner's Manual and thoroughly understand all instructions before using this equipment. Generac 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.

CONTENTS

This manual contains pertinent owner’s information, including warranty, electrical diagrams, exploded views and lists of repair parts, for three different Guardian models:

• 04389-2 – 6 kW NG, 7 kW LP, single-cylinder GH410 Engine

• 04456-2 – 12 kW NG, 12 kW LP, V-twin GT-990 Engine

• 04390-2 – 13 kW NG, 15 kW LP, V-twin GT-990 Engine

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 a Generac/ Guardian Authorized 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 ensures a minimum number of problems and keep operating expenses at a minimum. See a Generac/ Guardian Authorized Dealer for service aids and accessories.

HOW TO OBTAIN SERVICE

When the generator requires servicing or repairs, simply contact a Generac/Guardian Authorized Dealer for assistance. Service technicians are factorytrained and are capable of handling all service needs.

When contacting a Generac/Guardian Authorized Dealer or the factory about parts and service, always supply the complete model number and serial number of the unit as given on its data decal, which is located on the generator. See Figure 1.1 or Figure 1.2 in Section 1.6 for decal location.

Model No. ____________ Serial No. ______________



AUTHORIZED

DEALER LOCATION

To locate the nearest GENERAC/GUARDIAN

AUTHORIZED DEALER, please call this number:

1-800-333-1322

DEALER LOCATION INFORMATION

CAN BE OBTAINED AT THIS NUMBER.

DANGER

Table of Contents

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

Generac®Power Systems, Inc. 1

Introduction ........................Inside Front Cover

Read This Manual Thoroughly ........................IFC

Contents ..........................................................IFC

Operation and Maintenance ............................IFC

How to Obtain Service ....................................IFC

Authorized Dealer Locator Number ....................IFC

Safety Rules ........................................................2

Standards Index ..................................................3

Section 1 – General Information ..................4

1.1 Unpacking/Inspection ....................................4

1.2 Protection Systems ........................................4

1.3 NEC Requirement for Arc Fault Circuit

Interruption Breaker for Bedrooms ..............4

1.4 The Generator ..............................................5

1.5 Specifications ................................................6

1.6 System Set LED ............................................7

1.7 Fuel Requirements and Recommendations....7

1.8 Fuel Consumption ........................................7

1.9 Reconfiguring the Fuel System ......................7

1.10 Location ........................................................8

1.11 Battery Installation ........................................9

1.12 The Battery ....................................................9

Section 2 – Post Installation Start-up

and Adjustments ......................10

2.1 Before Initial Startup ..................................10

2.2 Check Transfer Switch Operation................10

2.3 Electrical Checks ........................................10

2.4 Generator Tests Under Load ......................11

2.5 Checking Automatic Operation ....................11

2.6 Adjusting the Regulator (Natural Gas Only) ..12

2.7 Engine Governor Adjustment ......................13

2.8 Voltage Regulator Adjustment......................13

Section 3 – Operation ....................................14

3.1 Break-in Procedure......................................14

3.2 Using the Auto/Off/Manual Switch ..............14

3.3 Automatic Transfer Operation ....................14

3.4 Sequence of Automatic Operation................15

3.5 Manual Transfer Operation ........................15

3.6 Setting the Exercise Timer ..........................16

3.7 Protection Systems ......................................16

Section 4 – Maintenance ..............................17

4.1 Fuse ............................................................17

4.2 Checking the Engine Oil Level ....................17

4.3 Changing the Engine Oil ..............................18

4.4 Changing the Oil Filter ................................18

4.5 Changing the Engine Air Cleaner ................18

4.6 Spark Plug(s) ..............................................19

4.7 Battery Maintenance ....................................19

4.8 Adjusting GH-410/GT-990 Valve Clearance ..20

4.9 Cooling System............................................20

4.10 Attention After Submersion ........................21

4.11 Corrosion Protection ..................................21

4.12 Out of Service Procedure ............................21

4.13 Service Schedule ........................................22

Section 5 – Troubleshooting ........................23

5.1 Troubleshooting Guide ................................23

Section 6 – Electrical Data ............................24

Section 7 – Exploded Views and

Parts Lists....................................32

Section 8 – Mounting Dimensions..............53

Section 9 – Notes ............................................54

Section 10 – Warranty....................................56

2 Generac®Power Systems, Inc.

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.

Generac cannot possibly 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 using a procedure, work method or operating technique Generac does not specifically recommend, ensure that it is safe for others. Also make sure the procedure, work method or operating technique chosen does not render the generator unsafe.

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 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 HAZAR

• For safety reasons, Generac recommends that the

installation, initial start-up and maintenance of this equipment is carried out by an Authorized Generac/Guardian Dealer.

• The engine exhaust fumes contain carbon monox-

ide, which can be DEADLY. This dangerous gas, if breathed in sufficient concentrations, can cause unconsciousness or even death. This exhaust system must be installed properly, in strict compliance with applicable codes and standards. Following installation, do nothing that might render the system unsafe or in noncompliance with such 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 venti-

lating air is critical to 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. The generator MUST be installed outdoors.

• 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 contact the

nearest Generac/Guardian Authorized Dealer for parts needing repair or replacement.

• Before performing any maintenance on the genera-

tor, 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.

IMPORTANT SAFETY INSTRUCTIONS

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe operation be copied and posted near the unit’s installation site. Safety should be stressed to all operators and potential operators of this equipment.

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.

WARNING:

DANGER

Generac®Power Systems, Inc. 3

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 does the standby generator when it is in operation. Avoid contact with bare wires, terminals, connections, etc., while the unit is running. 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.

• The National Electrical Code (NEC) requires the frame and external electrically conductive parts of the generator to be connected to an approved earth ground. Local electrical codes also may require proper grounding of the generator electrical system.

• After installing this home standby electrical system, the generator may crank and start at any time without warning. When this occurs, load circuits are transferred to the STANDBY (generator) power source. To prevent possible injury if such a start and transfer occur, always set the generator’s Auto/Off/Manual switch to its OFF position before working on equipment and remove the 5A and 15A fuses from the generator control panel.

• 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

• For fire safety, the generator must be installed and maintained properly. Installation always must 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 in accordance with the manufacturer’s instructions and recommendations. Following proper installation, do nothing that might alter a safe installation and render the unit in noncompliance with the aforementioned codes, standards, laws and regulations.

• Keep a fire extinguisher near the generator at all times. Extinguishers rated “ABC” by the National Fire Protection Association are appropriate for use on the standby electric system. Keep the extinguisher properly charged and be familiar with its use. Consult the local fire department with any questions pertaining to fire extinguishers.

EXPL

OSION HAZARDS

• 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.

• Gaseous fluids such as natural gas and liquid propane (LP) gas are extremely EXPLOSIVE. Install the fuel supply system according to applicable fuel-gas codes. Before placing the home standby electric system into service, fuel system lines must be properly purged and leak tested according to applicable code. After installation, inspect the fuel system periodically for leaks. No leakage is permitted.

STANDARDS INDEX

In the absence of pertinent standards, codes, regulations and laws, the published information listed below may be used as installation guide for this equipment.

1. NFPA No. 37, STATIONARY COMBUSTION

ENGINES AND GAS TURBINES, available from the National Fire Protection Association, 470 Atlantic Avenue, Boston, MA 02210.

2. NFPA No. 76A, ESSENTIAL ELECTRICAL SYS-

TEMS FOR HEALTH CARE FACILITIES, available same as Item 1.

3. NFPA No. 54, NATIONAL FUEL GAS CODE,

available same as Item 1.

4. NFPA No. 58, AMERICAN NATIONAL STANDARD

FOR STORAGE AND HANDLING OF LIQUEFIED PETROLEUM GAS, available same as Item 1.

5. NFPA No. 70, NFPA HANDBOOK OF NATIONAL

ELECTRIC CODE, available same as Item 1.

6. Article X, NATIONAL BUILDING CODE, available

from the American Insurance Association, 85 John Street, New York, N.Y. 10038.

7. AGRICULTURAL WIRING HANDBOOK, available

from the Food and Energy Council, 909 University Avenue, Columbia, MO 65201.

8. ASAE EP-3634, INSTALLATION AND MAINTE-

NANCE OF FARM STANDBY ELECTRICAL SYSTEMS, available from the American Society of Agricultural Engineers, 2950 Niles Road, St. Joseph, MI 49085.

9. NFPA No. 30, FLAMMABLE AND COMBUSTIBLE

LIQUIDS CODE, available same as Item 1.

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IMPORTANT SAFETY INSTRUCTIONS

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

Only qualified electricians or contractors should attempt such installations, which must comply strictly with applicable codes, standards and regulations.

1.1 UNPACKING/INSPECTION

After unpacking, carefully inspect the contents for damage.

• This standby generator set has been factory supplied with a weather protective enclosure that is intended for outdoor installation only.

• This standby generator set is packaged with an automatic transfer switch with built in load center. The combination transfer switch and load center is pre-wired with a two foot and 30 foot conduit. Circuit breakers for emergency circuit connections are included.

• This UL listed, 2-pole switch is rated at 100 AC amperes at 250 volts maximum. This transfer

switch is for indoor use only.

If this generator is used to power electrical load circuits normally powered by a utility power source, it is required by code to install a transfer switch. The transfer switch must effectively isolate the electrical system from the utility distribution system when the generator is operating (NEC 700, 701 & 702). Failure to isolate an electrical system by such means will result in damage to the generator and also may result in injury or death to utility power workers due to backfeed of electrical energy.

If any loss or damage is noted at time of delivery, have the person(s) making the delivery note all damage on the freight bill or affix their signature under the consignor's memo of loss or damage.

If a loss or damage is noted after delivery, separate the damaged materials and contact the carrier for claim procedures.

“Concealed damage” is understood to mean damage to the contents of a package that is not in evidence at the time of delivery, but is discovered later.

1.2 PROTECTION SYSTEMS

Unlike an automobile engine, the generator may have to run for long periods of time with no operator present to monitor engine conditions. For that reason, the engine is equipped with the following systems that protect it against potentially damaging conditions:

1. Low Oil Pressure Sensor 3. Overcrank

2. High Temperature Sensor 4. Overspeed

There are LED readouts on the control panel to notify personnel that one of these faults has occurred. There is also a “System Set” LED that is lit when all of the conditions describe in Section 1.3 are true.

1.3 NEC REQUIREMENT FOR ARC FAULT CIRCUIT INTERRUPTION BREAKER FOR BEDROOMS

In 2001, the National Electric Code (NEC) introduced a requirement for new construction. This new requirement indicates the need for Arc Fault Circuit Interrupters to be used to protect the complete branch circuit that feeds a dwelling bedroom. The actual NEC requirement is indicated below.

1.3.1 SECTION 210.12 ARC FAULT CIRCUIT INTERRUPTER PROTECTION

1. Definition: An arc fault circuit interrupter is a device intended to provide protection from the effects of arc faults by recognizing characteristics unique to arcing and by functioning to de-energize the circuit when an arc fault is detected.

2. Dwelling Unit Bedrooms: All branch circuits that supply 125 volt, single-phase, 15 and 20 ampere outlets installed in dwelling unit bedrooms shall be protected by an arc fault circuit interrupter listed to provide protection of the entire branch circuit.

Section 210.12 requires that AFCI protection be provided on branch circuits that supply outlets (receptacle, lighting, etc.) in dwelling bedrooms. The requirement is limited to 15 and 20 ampere, 125 volt circuits. There is no prohibition against providing AFCI protection on other circuits or in locations other than bedrooms. Because circuits are often shared between a bedroom and other areas such as closets and hallways, providing AFCI protection on the complete circuit would comply with 210.12.

If during the installation of the Guardian Home Standby system the decision is made to provide back up power to a bedroom branch circuit, then the circuit breaker in the Guardian Transfer Switch should be replaced with an Arc Fault Circuit Interrupter.

It is most important that breakers only be switched like for like. For instance, if replacing a 15A breaker, it MUST be replaced with a 15A AFCI breaker. Likewise, a 20A breaker MUST be replaced with a 20A AFCI.

These AFCI breakers are available at the nearest Home Depot or hardware store.

Siemens Item # Description

Q115AF 15A Single Pole AFCI

Q120AF 20A Single Pole AFCI

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Section 1 — General Information

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

4 Generac®Power Systems, Inc.

DANGER

Section 1 — General Information

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

Generac®Power Systems, Inc. 5

1.4 THE GENERATOR

Figure 1.2 – 12 kW and 15 kW, V-twin GT-990 Engine

Figure 1.1 – 7 kW, Single Cylinder GH-410 Engine

Exhaust Enclosure

Oil Check/Fill

Data Decal

Control Panel

Air Filter

Fuel Regulator

Oil Filter

Oil Dipstick

Exhaust Enclosure

Air Filter

Battery Compartment

Data Decal

Control Panel

Fuel Inlet

Fuel Regulator

Oil Filter

Fuel Inlet

Battery Compartment

6 Generac®Power Systems, Inc.

Section 1 — General Information

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

1.5 SPECIFICATIONS

1.5.1 GENERATOR

Model 04389-2 Model 04456-2 Model 04390-2

Rated Max. Continuous Power Capacity (Watts*) 6,000 NG/7,000 LP 12,000 NG/12,000 LP 13,000 NG/15,000 LP† Rated Voltage 120/240 120/240 120/240 Rated Max. Continuous Load Current (Amps)

120 Volts** 50.0 NG/58.3 LP 100.0 NG/100.0 LP 108.3 NG/125.0 LP

240 Volts 25.0 NG/29.2 LP 50.0 NG/50.0 LP 54.2 NG/62.5 LP Main Line Circuit Breaker 30 Amp 50 Amp 60 Amp/70 Amp† Phase 1 1 1 Number of Rotor Poles 2 2 2 Rated AC Frequency 60 Hz 60 Hz 60 Hz Power Factor 1 1 1 Recommended Air Filter Generac Part # C8127 Generac Part # C8127 Generac Part # C8127 Battery Requirement Group 26/26R Group 26/26R Group 26/26R

12 Volts and 12 Volts and 12 Volts and

350 Cold-cranking 550 Cold-cranking 550 Cold-cranking

Amperes Minimum Amperes Minimum Amperes Minimum

Weight 452 Pounds 470 Pounds 487 Pounds

Output Sound Level @ 23 ft (7m) at full load 68 db (A) 70.5db (A) 71.5 db (A)

Normal Operating Range -20°F (-28.8°C) to 104°F (40°C)

* Maximum wattage and current are subject to and limited by such factors as fuel Btu content, ambient temperature, altitude, engine power and condition, etc. Maximum power

decreases about 3.5 percent for each 1,000 feet above sea level; and also will decrease about 1 percent for each 6° C (10° F) above 16° C (60° F) ambient temperature.

** Load current values shown for 120 volts are maximum TOTAL values for two separate circuits. The maximum current in each circuit must not exceed the value stated for 240 volts. † 15,000 watt with upgrade kit 04578-1. Kit includes power harnesses and 70 amp 2-pole circuit breaker.

1.5.2 ENGINE

Model 04389-2 Model 04456-2 Model 04390-2

Type of Engine GH-410 GT-990 GT-990 Number of Cylinders 1 2 2 Rated Horsepower 14.5 @ 3,600 rpm 26 @ 3,600 rpm 30 @ 3,600 rpm Displacement 410cc 992cc 992cc Cylinder Block Aluminum w/Cast Aluminum w/Cast Aluminum w/Cast

Iron Sleeve Iron Sleeve Iron Sleeve Valve Arrangement Overhead Valves Overhead Valves Overhead Valves Ignition System Solid-state w/Magneto Solid-state w/Magneto Solid-state w/Magneto Recommended Spark Plug RC12YC RC12YC RC12YC Spark Plug Gap 0.76 mm (0.030 inch) 0.508 mm (0.020 inch) 0.508 mm (0.020 inch) Compression Ratio 8.6:1 9.5:1 9.5:1 Starter 12 Vdc 12 Vdc 12Vdc Oil Capacity Including Filter Approx. 1.5 Qts Approx. 1.7 Qts Approx. 1.7 Qts Recommended Oil Filter Generac Part # 70185 Generac Part # 70185 Generac Part # 70185 Recommended Air Filter Generac Part # 0C8127 Generac Part # 0C8127 Generac Part # 0C8127 Operating RPM 3,600 3,600 3,600

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Generac®Power Systems, Inc. 7

1.6 SYSTEM SET LED

The “System Set” LED is lit when all of the following conditions are true:

1. The AUTO/OFF/MANUAL switch is set to the AUTO position.

2. The utility voltage being supplied to the unit is being sensed by the PCB. If the utility sense voltage is not connected to the unit or if it is below 168 volts AC, then the system set light will flash rapidly. This indicates that if the AUTO/OFF/ MANUAL switch is placed in the Auto position, the generator will start.

3. The “Not In Auto” dip switch is set to the OFF position on the control board.

4. No alarms are present, for example, low oil pressure, high temperature, etc.

1.7 FUEL REQUIREMENTS

AND RECOMMENDATIONS

With LP gas, use only the vapor withdrawal system. This type of system uses the vapors formed

above the liquid fuel in the storage tank.

The engine has been fitted with a fuel carburetion system that meets the specifications of the 1997 California Air Resources Board for tamper-proof dual fuel systems. The unit will run on natural gas or LP gas, but it has been factory set to run on natural gas. Should the primary fuel need to be changed to LP gas, the fuel system needs to be reconfigured. See Section 1.9 for instructions on reconfiguration of the fuel system.

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.

Fuel pressure for both natural gas and liquid propane set ups should be 11 inches to 14 inches

of water column (0.6 psi) at all load ranges.

NOTE:

A separate gas line and regulator may be needed to assure proper gas pressure (11-14”) to the generator. Low gas pressure can cause hard starting and could affect engine durability.

1.8 FUEL CONSUMPTION

*Natural gas is in cubic feet per hour. **LP is in gallons per hour/cubic feet per hour.

Gaseous fuels such as natural gas and liquid propane (LP) gas are highly explosive. Even the slightest spark can ignite such fuels and cause an explosion. No leakage of fuel is permitted. Natural gas, which is lighter than air, tends to collect in high areas. LP gas is heavier than air and tends to settle in low areas.

1.9 RECONFIGURING THE FUEL SYSTEM

1.9.1 7 KW, 410CC ENGINE

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 of the demand regulator (Figure 1.3).

3. Disconnect wire #0 and wire #14 from the gas

solenoid located on the top of the demand regulator.

4. Remove the demand regulator by rotating coun-

terclockwise.

5. Remove the brass hose fitting from the outlet port

of the demand regulator.

6. Remove the brass metering jet (loosen counter-

clockwise) from the housing port of the demand regulator located on the side of the regulator.

7. Install new LP metering jet (tighten clockwise) in

the outlet port of the demand regulator.

8. Refit the brass hose fittings to the outlet port of

the demand regulator.

9. Reverse procedure steps 1-4 to reinstall demand

regulator.

10. Reverse the procedure to convert back to natural

gas.

Figure 1.3 – Demand Regulator

OSE

OUSING PORT

◆

Section 1 — General Information

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

Model # Nat. Gas (*) LP Vapor (**)

1/2 Load Full Load 1/2 Load Full Load

04389 74 105 0.91/33 1.21/44.1 04456 114 185 1.34/48.9 2.17/79.0 04390 148.5 240 1.73/63.2 2.80/102.3

DANGER

FUEL H

BRASS H

FITTIN

BRASS H

REGULAT H

FITTIN

FUEL JE

NG FUEL SYSTE

LP FUEL SYSTE

NOTE:

The natural gas adjustment screw is preset during installation and should not need any further adjustment.

1.9.2 12KW AND 15KW, 990CC ENGINES

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

NOTE:

The primary regulator for the propane supply is NOT INCLUDED with the generator. A fuel pressure of 11 to 14 inches of water column (0.6 psi) to the fuel inlet of the generator MUST BE SUPPLIED.

1. Turn OFF the main gas supply.

2. Remove the engine air in baffle located on the left hand side of the battery compartment. Two M6 screws are located on top of the baffle and two M6 screws are located on the inside of the baffle towards the back.

3. Remove the small hose clamp and hose from the fuel regulator. It may be necessary to pry the hose off of the brass fitting using a screw driver to gently lift up the hose edge.

4. Remove the brass hose fitting screwed into the fuel regulator.

5. Locate and identify the brass idle jet. This will be located in the fuel regulator casting facing the front of the unit.

6. Remove the idle jet from its holding location.

7. Place the idle jet, thread side first, into the threaded hole originally occupied by the brass hose fitting.

8. Using a short No. 2 Phillips screw driver, thread the idle jet into the regulator casting. DO NOT OVER TIGHTEN.

9. Apply thread sealant to the threads of the hose fitting and replace it into the regulator body.

10. Re-attach the small hose and hose clamp and tighten as necessary.

11. Replace the engine air in baffle using the four M6 screws.

12. Identify both brass adjustment screws on the regulator.

NOTE:

One adjustment screw can be accessed from the front of the unit and the second can be accessed from the back of the unit enclosure by removing the plastic hole plug.

13. To adjust the system to run on LP fuel, turn the adjuster screw that can be accessed from inside the front of the unit, ¼ TURN CLOCKWISE. This should now set the system for maximum power and best performance.

14. It may be necessary to make minor adjustments to the preset adjustment screw settings to achieve maximum power. If experiencing problems with the unit producing maximum power, follow the procedure in Section 2.6 (Adjusting the Fuel Regulator).

Figure 1.4 - Demand Regulator

1.10 LOCATION

1.10.1 GENERATOR

Install the generator set, in its protective enclosure, outdoors, where adequate cooling and ventilating air is always available. Consider these factors:

• Install the unit where air inlet and outlet openings

will not become obstructed by leaves, grass, snow, etc. If prevailing winds will cause blowing or drifting, consider using a windbreak to protect the unit.

• Install the generator on high ground where water

levels will not rise and endanger it.

• Allow sufficient room on all sides of the generator

for maintenance and servicing. A good rule is to allow three feet of space on all sides.

• Where strong prevailing winds blow from one

direction, face the generator air inlet openings to the prevailing winds.

• Install the generator as close as possible to the fuel

supply, to reduce the length of piping.

• Install the generator as close as possible to the

transfer switch. HOWEVER, REMEMBER THAT LAWS OR CODES MAY REGULATE THE DISTANCE.

The genset must be installed on a level surface. The base frame must be level within two (2) inches all around.

1.10.2 TRANSFER SWITCH

1.10.2.1 7 kW, 12 kW and 15 kW Units

The transfer switch shipped with this generator is enclosed in a NEMA 1 enclosure. This type of enclo- sure is intended for indoor use only. Follow these rules:

◆

SSURE

OSE

OUSING PORT

JUSTER

◆

Section 1 — General Information

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

8 Generac®Power Systems, Inc.

FUEL H BRASS HOSE

FITTIN

IDLE CIRCUI

POR

PRE

1/8 NP

BRASS HOSE

FITTIN

REW

FUEL JE

REGULAT H

MAL

Generac®Power Systems, Inc. 9

• Install the transfer switch indoors on a firm, sturdy supporting structure.

• To prevent switch distortion, level the switch if necessary. This can be done by placing washers between the switch enclosure and mounting surface.

• Never install the switch where water or any corrosive substance might drip onto the enclosure.

• Protect the switch at all times against excessive moisture, dust, dirt, lint, construction grit and corrosive vapors.

1.11 BATTERY INSTALLATION

Fill the battery with the proper electrolyte fluid if necessary and have the battery fully charged before installing it.

Before installing and connecting the battery, complete the following steps:

1. Set the generator's AUTO/OFF/MANUAL switch to

OFF.

2. Turn off utility power supply to the transfer

switch.

3. Remove the 5A and 15A fuses from the generator

control panel.

If the AUTO/OFF/MANUAL switch is not set to its OFF position, the generator can crank and start as soon as the battery cables are connected. If the utility power supply is not turned off, sparking can occur at the battery posts and cause an explosion.

Battery cables were factory connected at the generator (Figure 1.5). Connect cables to battery posts as follows:

Figure 1.5 – Battery Cable Connections

4. Connect the red battery cable (from starter con-

tactor) to the battery post indicated by a positive, POS or (+).

5. Connect the black battery cable (from frame ground) to the battery post indicated by a negative, NEG or (—).

NOTE:

Damage will result if battery connections are made in reverse.

NOTE:

The generator is equipped with a battery trickle charger that is active when the unit is set up for automatic operation. With the battery installed and utility power source voltage available to the transfer switch, the battery receives a trickle charge while the engine is not running, to prevent self-discharge. The trickle charger is designed to help extend the life of the battery by maintaining the battery when the unit is not running. The trickle charge feature cannot be used to recharge a discharged battery.

1.12 THE BATTERY

Servicing of the battery is to be performed or supervised by personnel knowledgeable of batteries and the required precautions. Keep unauthorized personnel away from batteries.

When replacing the battery, use the following type of battery: Group 26/26R 12-volt DC, negative ground battery with a rating of 350 cold-cranking amps minimum for 7 kW; 550 cold-cranking amps minimum for 12 and 15 kW at -17.8º C (0º F) minimum. When using a maintenance-free battery, it is not necessary to check the specific gravity or electrolyte level. Have these procedures performed at the intervals specified in the “Service Schedule.” A negative ground system is used. Battery connections are shown on the wiring diagrams. Make sure the battery is correctly connected and terminals are tight. Observe battery polarity when connecting the battery to the generator set.

Do not dispose of the battery in a fire. The battery is capable of exploding.

A battery presents a risk of electrical shock and high short circuit current. The following precautions are to be observed when working on batteries:

• Remove the 5A and 15A fuses from the generator

control panel.

• Remove watches, rings or other metal objects;

• Use tools with insulated handles;

• Wear rubber gloves and boots;

• Do not lay tools or metal parts on top of the

battery; and

• Disconnect charging source prior to connecting or dis-

connecting battery terminals.

Section 1 — General Information

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

DANGER

10 Generac®Power Systems, Inc.

Do not open or mutilate the battery. Released electrolyte has been known to be harmful to the skin and eyes, and to be toxic.

The electrolyte is a dilute sulfuric acid that is harmful to the skin and eyes. It is electrically conductive and corrosive.

The following procedures are to be observed:

• Wear full eye protection and protective clothing;

• Where electrolyte contacts the skin, wash it off immediately with water;

• Where electrolyte contacts the eyes, flush thoroughly and immediately with water and seek medical attention; and

• Spilled electrolyte is to be washed down with an acid neutralizing agent. A common practice is to use a solution of 1 pound (500 grams) bicarbonate of soda to 1 gallon (4 liters) of water. The bicarbonate of soda solution is to be added until the evidence of reaction (foaming) has ceased. The resulting liquid is to be flushed with water and the area dried.

Lead-acid batteries present a risk of fire because they generate hydrogen gas. The following procedures are to be followed:

• DO NOT SMOKE when near the battery;

• DO NOT cause flame or spark in battery area; and

• Discharge static electricity from body before touching the battery by first touching a grounded metal surface.

Be sure the AUTO/OFF/MANUAL switch is set to the OFF position before connecting the battery cables. If the switch is set to AUTO or MANUAL, the generator can crank and start as soon as the battery cables are connected.

Be sure the utility power supply is turned off and the 5A and 15A fuses are removed from the generator control panel, or sparking may occur at the battery posts as the cables are attached and cause an explosion.

2.1 BEFORE INITIAL START-UP

Before starting, complete the following:

1. Set the generator’s main circuit breaker to its

OFF (or open) position.

2. Set the generator's AUTO/OFF/MANUAL switch to

the OFF position.

3. Turn OFF the utility power supply to the transfer

switch using the means provided (such as the utility main line circuit breaker).

4. Turn OFF all loads connected to the transfer

switch terminals T1 and T2.

5. Check the engine crankcase oil level and, if necessary, fill to the dipstick FULL mark with the recommended oil. Do not fill above the FULL mark.

6. Check the fuel supply. Gaseous fuel lines must have been properly purged and leak tested in accordance with applicable fuel-gas codes. All fuel shutoff valves in the fuel supply lines must be open.

Never operate the engine with the oil level below the “Add” mark on the dipstick. Doing this could damage the engine.

2.2 CHECK TRANSFER SWITCH

OPERATION

Refer to Section 3.5, of the owner’s manual for manual operation procedures.

Do not attempt manual transfer switch operation until all power voltage supplies to the transfer switch have been positively turned off. Failure to turn off all power voltage supplies will result in extremely hazardous and possibly fatal electrical shock.

2.3 ELECTRICAL CHECKS

Complete electrical checks as follows:

1. Set the generator's main circuit breaker to its OFF (or open) position.

2. Set the generator's AUTO/OFF/MANUAL switch to the OFF position.

3. Turn OFF all loads connected to the transfer switch terminals T1 and T2.

4. Turn on the utility power supply to the transfer switch using the means provided (such as a utility main line circuit breaker).

The transfer switch is now electrically “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. Nominal line-to-line voltage should be 240 volts AC.

6. Check utility power source voltage across terminals N1 and the transfer switch neutral lug; then across terminal N2 and neutral. Nominal line-toneutral voltage should be 120 volts AC.

Section 2 — Post Installation Start-up and Adjustments

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

DANGER

Generac®Power Systems, Inc. 11

7. When certain that utility supply voltage is compatible with transfer switch and load circuit ratings, turn OFF the utility power supply to the transfer switch.

8. On the generator panel, set the AUTO/OFF/ MANUAL switch to MANUAL. The engine should crank and start.

9. Let the engine warm up for about five minutes to allow internal temperatures to stabilize. Then, set the generator’s main circuit breaker to its ON (or closed) position.

Proceed with caution! Generator power voltage is now supplied to the transfer switch. Contact with live transfer switch parts will result in dangerous and possibly fatal electrical shock.

10. Connect an accurate AC voltmeter and a frequency meter across transfer switch terminal lugs E1 and E2. Voltage should be 242-252 volts; frequency should read about 61-63 Hertz.

11. Connect the AC voltmeter test leads across terminal lug E1 and neutral; then across E2 and neutral. In both cases, voltage reading should be 121126 volts AC.

12. Set the generator’s main circuit breaker to its OFF (or open) position. Let the engine run at noload for a few minutes to stabilize internal engine generator temperatures.

13. Set the generator's AUTO/OFF/MANUAL switch to OFF. The engine should shut down.

NOTE:

It is important not to proceed until certain that generator AC voltage and frequency are correct and within the stated limits. Generally, if both AC frequency and voltage are high or low, the engine governor requires adjustment. If frequency is correct, but voltage is high or low, the generator’s voltage regulator requires adjustment.

2.4 GENERATOR TESTS UNDER LOAD

To test the generator set with electrical loads applied, proceed as follows:

1. Set generator’s main circuit breaker to its OFF (or open) position.

2. Turn OFF all loads connected to the transfer switch terminals T1 and T2.

3. Set the generator's AUTO/OFF/MANUAL switch to OFF.

4. Turn OFF the utility power supply to the transfer switch, using the means provided (such as a utility main line circuit breaker).

5. Manually set the transfer switch to the STANDBY position, i.e., load terminals connected to the generator's E1/E2 terminals. The transfer switch operating lever should be down.

6. Set the generator's AUTO/OFF/MANUAL switch to MANUAL. The engine should crank and start immediately.

7. Let the engine stabilize and warm up for a few minutes.

8. Set the generator’s main circuit breaker to its ON (or closed) position. Loads are now powered by the standby generator.

9. Turn ON electrical loads connected to transfer switch T1 and T2. Apply an electrical load equal to the full rated wattage/amperage capacity of the installed generator.

10. Connect an accurate AC voltmeter and a frequency meter across terminal lugs E1 and E2. Voltage should be greater than 230 volts; frequency should be greater than 58 Hertz.

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.

13. Set the generator's main circuit breaker to its OFF (or open) position.

14. Let the engine run at no-load for a few minutes.

15. Set the AUTO/OFF/MANUAL switch to OFF. The engine should shut down.

2.5 CHECKING AUTOMATIC

OPERATION

To check the system for proper automatic operation, proceed as follows:

1. Set generator’s main circuit breaker to its OFF (or open) position.

2. Check that the AUTO/OFF/MANUAL switch is set to OFF.

3. Turn OFF the utility power supply to the transfer switch, using means provided (such as a utility main line circuit breaker).

4. Manually set the transfer switch to the UTILITY position, i.e., load terminals connected to the utility power source side.

Section 2 — Post Installation Start-up and Adjustments

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

DANGER

12 Generac®Power Systems, Inc.

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

6. Set the AUTO/OFF/MANUAL switch to AUTO. The system is now ready for automatic operation.

7. Turn OFF the utility power supply to the transfer switch.

With the AUTO/OFF/MANUAL switch at AUTO, the engine should crank and start when the utility source power is turned OFF. After starting, the transfer switch should connect load circuits to the standby side. Let the system go through its entire automatic sequence of operation.

With the generator running and loads powered by generator AC output, turn ON the utility power supply to the transfer switch. The following should occur:

• After about six seconds, the switch should transfer

loads back to the utility power source.

• About one minute after retransfer, the engine

should shut down.

2.6 ADJUSTING THE REGULATOR

(NATURAL GAS ONLY)

Although the generator has been factory set to provide maximum power, it may be necessary in some areas to adjust this setting. Because natural gas has different BTU or power content across the country the engine may not perform as designed.

If experiencing engine problems at high or full load conditions follow these steps. It will require a frequency meter to perform this procedure.

1. Turn off utility power to the main distribution panel in the house. This can be done by switching the service main breaker to the off or open position.

2. Allow the generator to start. Before loading the generator, confirm that the No Load Frequency, with the roof open and door off, is set to 63-63.5 Hz. Transfer load to emergency circuits.

3. Turn on appliances, lights, pumps, etc., that are on the emergency circuits in an attempt to fully load the generator. Be cautious not to overload the generator. Use the following chart as a guide:

4. When full load has been achieved. Connect a frequency meter to the output lugs of the generator’s main line circuit breaker.

5. The fuel regulator is fitted with one (7 kW), or two (12 & 15 kW) adjustment screws. While watching the frequency meter, slowly turn the adjustment screws clockwise or counterclockwise one at a time until the highest frequency is read on the meter. Only limited adjustment is available between the set pins (7 kW only). Under no circumstances should any of the pins be removed (Figures 2.1 and 2.2).

Figure 2.1 — Dual Fuel Regulators

6. When the highest frequency is reached maximum power has been set. From this point turn both adjustment screws 1/4 turn counterclockwise. The regulator is now set.

Figure 2.2 — Placement of Regulator

7. Turn utility power to the main distribution panel back on. This can be done by switching the service main breaker to the on or closed position. Allow the generator to shut down.

Do not make any unnecessary adjustments. Factory settings are correct for most applications. However, when making adjustments, be careful to avoid overspeeding the engine.

Section 2 — Post Installation Start-up and Adjustments

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

Unit 120 Volts 240 Volts

7 kW 50.0 amps 25.0 amps 12 kW 100.0 amps 50.0 amps 13 kW 108.3 amps 54.1 amps

990

Adjustment

Screw

(Both sides)

Adjustment

Screw

(One Side Only)

410

Set

Pins

Adjustment Screw

Generac®Power Systems, Inc. 13

Section 2 — Post Installation Start-up and Adjustments

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

If this procedure or the equipment are not available, locate the nearest Generac Guardian Dealer and they can perform the adjustments.

NOTE:

A service fee may be charged for this adjustment.

2.7 ENGINE GOVERNOR ADJUSTMENT

If both AC frequency and voltage are correspondingly high or low, adjust the engine governor as follows:

2.7.1 7 KW UNITS

1. Loosen the governor clamp bolt (Figures 2.3).

2. Hold the governor lever at its wide open throttle position, and rotate the governor shaft clockwise as far as it will go. Then, tighten the governor lever clamp bolt to 70 inch-pounds (8 N-m).

3. Start the generator; let it stabilize and warm up at no-load.

4. Connect a frequency meter across the generators AC output leads.

5. Turn the speed adjust nut to obtain a frequency reading of 63 Hertz.

6. When frequency is correct at no load, check the AC voltage reading. If voltage is incorrect, the voltage regulator may require adjustment.

Figure 2.3 — Engine Governor Adjustment

2.7.2 12 KW AND 15 KW UNITS

1. Loosen governor clamp bolt (See Figure 2.3).

2. Completely remove the idle spring.

3. With governor arm at wide open throttle position, rotate governor shaft fully clockwise. Tighten clamp bolt to 84 inch-pounds.

4. Start unit and apply full load. Use full load speed adjust screw (Figure 2.4) to adjust frequency to 58 Hz.

5. Remove load, stop engine, loosen the idle adjust screw and reconnect the idle spring.

Figure 2.4 — Full Load Speed Adjust Screw

6. Using a hand, push the governor arm to the closed throttle position. Make sure the idle spring does not stretch at all.

7. Restart the unit.

8. Slowly turn the idle adjust screw to adjust the noload idle frequency to 63-63.5 Hz (with door open).

9. The governor is now set.

2.7.3 ADDITIONAL CORROSION

PROTECTION

Periodically spray all engine linkage parts and brackets with corrosion inhibiting spray such as WD-40 or a comparable product.

2.8 VOLTAGE REGULATOR

ADJUSTMENT

With the frequency between 62-63 Hertz, slowly turn the slotted potentiometer (Figure 2.5) until line voltage reads 247-252 volts.

Figure 2.5 – Voltage Adjustment Potentiometer

◆

Idle Spring

Governor Shaft

(Rotate

Clockwise)

Full Load Speed Adjust Screw

Governor Clamp Bolt

No Load Idle Adjustment Screw

14 Generac®Power Systems, Inc.

Section 3 — Operation

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

NOTE:

The access panel on top of the control panel must be removed to adjust the voltage regulator.

NOTE:

The voltage regulator is housed above the generator's control panel. The regulator maintains a voltage in direct proportion to frequency at a 2-to-1 ratio. For example, at 62 Hertz, line-to-neutral voltage will be 124 volts.

3.1 BREAK-IN PROCEDURE

Once the unit has been installed and all electrical checks have been made, it is strongly recommended that the following “Break-in Procedure” be completed to ensure correct generator operation in the future.

1. Set the generator’s AUTO/OFF/MANUAL switch to AUTO.

2. Turn OFF the utility power supply to the transfer switch using the means provided (such as a utility main line circuit breaker).

3. The unit will start, and the transfer switch will transfer to standby.

4. Using the transfer switch’s built-in emergency load center, turn on circuits to load the generator to approximately 25% rated load and run the unit for one hour.

5. Run the unit for one hour at 50% rated load.

6. Run the unit for one hour at 75% rated load.

7. Run the unit for one hour at 100% rated load.

8. Turn ON the utility power supply to the transfer switch, which will allow the transfer switch to transfer back to utility power. The unit will continue to run for one minute and then shut down.

9. Allow the unit to cool.

10. Set the generator’s main circuit breaker to its OFF (or open) position.

11. Set the generator's AUTO/OFF/MANUAL switch to OFF. Remove the 5A and 15A fuses from the generator control panel. Disconnect the battery cables as outlined in “General Hazards” (page 2).

12. Drain the oil and remove the oil filter. Replace the oil filter according to Section 4.4, “Changing the Oil Filter”. Replace the oil with synthetic oil as recommended in Section 4.3, “Changing the Engine Oil”.

13. Reconnect the battery cables as outlined in “General Hazards” (page 2) and insert the 5A and 15A fuses into the generator control panel. The generator is now ready for service.

3.2 USING THE AUTO/OFF/MANUAL SWITCH (FIGURE 3.1)

3.2.1 “AUTO” POSITION

Selecting this switch position activates fully automatic system operation. It also allows personnel to start and exercise the engine every seven days with the setting of the exercise timer (see Section 3.6). This position also is used for remote starting, when it is set up.

3.2.2 “OFF” POSITION

This switch position shuts down the engine. This position also prevents automatic operation.

3.2.3 “MANUAL” POSITION

Set the switch to MANUAL to crank and start the engine. Transfer to standby power will not occur unless there is a utility failure.

Figure 3.1 – Generator Control Panel

With the switch set to AUTO, the engine may crank and start at any time without warning. Such automatic starting normally occurs when utility power source voltage drops below a preset level or during the normal exercise cycle. To prevent possible injury that might be caused by such sudden starts, always set the switch to OFF and remove the fuses before working on or around the generator or transfer switch. Then, place a “DO NOT OPERATE” tag on the generator panel and on the transfer switch.

3.3 AUTOMATIC TRANSFER OPERATION

To select automatic operation, do the following:

1. Make sure the transfer switch main contacts are

set to their UTILITY position, i.e., loads connected to the utility power source (Figure 3.2).

2. Be sure that normal UTILITY power source volt-

age is available to transfer switch terminal lugs N1 and N2.



FUSE

15A

OFFAUTO

SET

EXERCISE

TIME

MAN.

Locat e your nearest dealer at :

POWER SYSTEMS, INC.

FLA S HING GREEN L ED=

4FLASHINGREDLEDS=

SYSTEM SET LOW OIL HIGH TEMP. OVER SPEED OVER CRANK

N O U T IL IT Y S E N S E

EX ERCISER N O T SET

Generac®Power Systems, Inc. 15

3. Set the generator’s AUTO/OFF/MANUAL switch to AUTO.

4. Set the generator’s main circuit breaker to its ON (or closed) position.

With the preceding steps complete, the generator will start automatically when utility source voltage drops below a preset level. After the unit starts, loads are transferred to the standby power source. Refer to Section 3.4, “Sequence of Automatic Operation.”

3.4 SEQUENCE OF AUTOMATIC

OPERATION

The generator’s control panel houses a control logic circuit board. This board constantly monitors utility power source voltage. Should that voltage drop below a preset level, circuit board action will signal the engine to crank and start. After the engine starts, the circuit board signals the transfer switch to activate and connect load circuits to the standby power supply (load terminal lugs T1/T2 connect to terminal lugs E1/E2).

Upon restoration of utility source voltage above a preset level, generator circuit board action signals the transfer switch to transfer loads back to that power supply. After retransfer, the engine is signalled to shut down.

The actual sequence of operation is controlled by sensors and timers on a control logic circuit board, as follows:

A. Utility Voltage Dropout Sensor

• This sensor monitors utility source voltage.

• If utility source voltage drops below about 70 percent of the nominal supply voltage, the sensor energizes a 15-second timer.

• Once the timer has expired, the engine will crank and start.

B.Engine Warm-up Time Delay

• This mechanism lets the engine warm up for about 10 seconds before the load is transferred to the standby source.

C.Standby Voltage Sensor

• This sensor monitors generator AC output voltage. When the voltage has reached 50 percent of the nominal rated voltage, transfer to standby can occur.

D.Utility Voltage Pickup Sensor

• This sensor monitors utility power supply voltage. When that voltage is restored above 70 percent of the nominal source voltage, a retransfer time delay starts timing.

E.Retransfer Time Delay

• This timer runs for about 15 seconds.

• At end of a 15-second delay, circuit board action de-energizes transfer relay in the transfer switch.

• Retransfer to utility power source then occurs.

F. Engine Cool-down Timer

• When the load is transferred back to utility power source, the engine cool-down timer starts timing.

• The timer will run for about one minute, and the generator will then shut down.

3.5 MANUAL TRANSFER OPERATION

3.5.1 TRANSFER TO GENERATOR POWER SOURCE

To start the generator and activate the transfer switch manually, proceed as follows:

1. Set the generator’s AUTO/OFF/MANUAL switch to OFF.

2. Set the generator’s main circuit breaker to its OFF (or open) position.

3. Turn OFF the utility power supply to the transfer switch using the means provided (such as a utility main line circuit breaker).

Do not attempt to activate the transfer switch manually until all power voltage supplies to the switch have been positively turned off. Failure to turn off all power voltage supplies may result in extremely hazardous and possibly fatal electrical shock.

4. Use the manual transfer handle inside the transfer switch to move the main contacts to their “Standby” position, i.e., loads connected to the standby power source (Figure 3.2).

Figure 3.2 – Manual Transfer Switch Operation

5. To crank and start the engine, set the AUTO/OFF/MANUAL switch to MANUAL.

6. Let the engine stabilize and warm up for a few minutes.

7. Set the generator’s main circuit breaker to its ON (or closed) position. The standby power source now powers the loads.

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Section 3 — Operation

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

DANGER

16 Generac®Power Systems, Inc.

3.5.2 TRANSFER BACK TO UTILITY POWER SOURCE

When utility power has been restored, transfer back to that source and shut down the generator. This can be accomplished as follows:

1. Set the generator’s main circuit breaker to its OFF (or open) position.

2. Let the engine run for a minute or two at no-load to stabilize the internal temperatures.

3. Set the generator’s AUTO/OFF/MANUAL switch to its OFF (or open) position. The engine should shut down.

4. Check that utility power supply to the transfer switch is turned OFF.

5. Use the manual transfer handle inside the transfer switch to move the main contacts back to their UTILITY position, i.e., loads connected to the utility power source (Figure 3.2).

6. Turn ON the utility power supply to the transfer switch using the means provided.

7. Set the system to automatic operation as outlined in “Automatic Transfer Operation,” Section 3.3.

3.6 SETTING THE EXERCISE TIMER

This generator is equipped with an exercise timer. Once it is set, the generator will start and exercise once every seven days, on the day of the week and at the time of day the following sequence is completed. During this exercise period, the unit runs for approximately 12 minutes and then shuts down. Transfer of loads to the generator output does not occur during the exercise cycle.

A switch on the control panel (see Figure 3.1) permits selection of the day and time for the system to exercise. At the chosen time, perform the following sequence to select the desired day and time of day the system will exercise.

1. Verify that the AUTO/OFF/MANUAL switch is set to AUTO.

2. Hold down the “Set Exercise Time” switch until the generator starts (approximately 10 seconds) and then release.

3. The generator will start and run for approximately 12 minutes and then shut down on its own. The exerciser will then be set to run at that time of day every week.

NOTE:

The exerciser will only work in the AUTO mode and will not work unless this procedure is performed. The exerciser will need to be reset every time the 12-volt battery is disconnected and then reconnected. The exerciser WILL NOT work if dip switch 2 on the controller printed circuit board (Remote Not Auto) is ON.

3.7 PROTECTION SYSTEMS

3.7.1 LOW OIL PRESSURE SWITCH

This switch (Figure 3.3) 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. The AUTO/OFF/MANUAL switch must then be turned to OFF and then back to AUTO.

3.7.2 HIGH TEMPERATURE SWITCH

This switch’s contacts (Figure 3.3) close if the temperature should exceed approximately 140º C (284º F), initiating an engine shutdown. The generator will automatically restart and the LED on the generator control panel will reset once the temperature has returned to a safe operating level.

Figure 3.3 – Low Oil Pressure and

High Temperature Switches

3.7.3 OVERCRANK

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 starting. The unit will crank and rest for a preset time limit. Then, it will stop cranking, and the LED on the generator control panel will light indicating an overcrank failure. The AUTO/OFF/MANUAL switch will need to be set to OFF and then back to AUTO to reset the generator control board.

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Section 3 — Operation

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

DANGER

Low Oil Switch

High Temp Switch

Oil Drain Hose

Oil Filter

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