Generac Power Systems 27 kW

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Owner’s Manual

For

Spark-Ignited Stationary Emergency Generators

Residential and Commercial

This manual should remain with the unit.

This manual must be used in conjunction

with the appropriate installation manual.

*

NOT INTENDED FOR USE IN CRITICAL

LIFE SUPPORT APPLICATIONS.

*

ONLY QUALIFIED ELECTRICIANS OR

CONTRACTORS SHOULD ATTEMPT

INSTALLATION!

*

DEADLY EXHAUST FUMES! OUTDOOR

INSTALLATION ONLY!

22 kW 2.4L

25 kW 1.5L

27 kW 2.4L

30 kW 1.5L

32 kW 2.4L

36 kW 2.4L

38 kW 2.4L

45 kW 2.4L

48 kW 5.4L

60 kW 2.4L

Para español , visita:

http://www.generac.com/service‐support/product‐support‐lookup

Pour le français, visiter : http://www.generac.com/service‐support/product‐support‐lookup

Table of Contents

Questions and Answers:

N
Nicole HarrisonAug 4, 2025
Why Generac Power Systems 27 kW engine will not crank?
- T
  Tiffany BriggsAug 4, 2025
  If your Generac Power Systems Portable Generator engine won't crank, here's what might be happening: * A blown fuse could be the culprit. Replace the 7.5 amp fuse in the generator control panel. If it blows again, there may be a short circuit that needs fixing. * Loose, corroded, or defective battery cables can also prevent cranking. Try tightening, cleaning, or replacing them as needed. * A defective starter contact or starter motor could also be the reason. Tighten, clean, or replace these components as necessary. * The battery might be dead. In this case, charge or replace the battery.
S
Sandra GuerreroAug 8, 2025
What to do if Generac Power Systems 27 kW unit shuts down during operation?
- W
  William FuentesAug 8, 2025
  If your Generac Power Systems Portable Generator unit shuts down during operation, it could be due to several reasons: * **High Temperature:** Ensure there's enough ventilation around the intake, exhaust, and rear of the generator. If there are no obstructions, contact a dealer. * **Overload:** Clear the alarm, remove loads from the generator, put back in AUTO, and restart. * **RPM Sense Loss:** Clear the alarm, remove loads from the generator, put back in AUTO, and restart. If the problem continues, contact a dealer to check for fuel issues.
T
Timothy NortonAug 12, 2025
What to do if Generac Power Systems 27 kW Portable Generator engine cranks but will not start?
- M
  Mark DiazAug 13, 2025
  If your Generac Power Systems Portable Generator engine cranks but won't start, consider these potential causes: * **Out of fuel:** Replenish the fuel supply and ensure the fuel valve is turned on. * **Open F1 7.5 amp fuse:** Replace the F1 7.5 amp fuse. If it blows again, there might be an issue requiring further inspection. * **Open F2 15 amp fuse:** Replace the F2 15 amp fuse. If it blows again, further inspection may be needed. * **No fuel supply:** Make sure the fuel supply is turned on.
J
John RossAug 16, 2025
How to fix no AC output from Generac Power Systems Portable Generator?
- M
  Maria HowardAug 17, 2025
  If your Generac Power Systems Portable Generator is not producing AC output, check if the main line circuit breaker is in the OFF (OPEN) position. If so, reset the circuit breaker to the ON (CLOSED) position.
A
Anthony LangAug 21, 2025
Why Generac Power Systems 27 kW unit consumes large amounts of oil?
- K
  Kenneth LarsonAug 21, 2025
  If your Generac Power Systems Portable Generator unit consumes large amounts of oil, the following reasons are possible: * The engine is overfilled with oil. Adjust the oil to the correct level. * The oil type or viscosity is incorrect. Refer to the Engine Oil Recommendations. * There is a damaged gasket, seal, or hose. Check for oil leaks.
M
mcgeejordanAug 26, 2025
Why Generac Power Systems 27 kW Portable Generator engine starts hard and runs rough?
- K
  Kenneth WatsonAug 26, 2025
  If your Generac Power Systems Portable Generator engine starts hard and runs rough, the air cleaner might be plugged or damaged. Inspect and replace the air cleaner if necessary.
J
johnsonsamanthaAug 29, 2025
What to do if Generac Power Systems 27 kW unit will not start in AUTO with utility loss?
- J
  josephvaughnAug 29, 2025
  If your Generac Power Systems Portable Generator unit will not start in AUTO with utility loss, the following reasons are possible: * NOT ACTIVATED: Refer to activation section in Owner’s Manual. * LOW OIL PRESSURE: Check oil level. Add oil per Owner’s Manual. Contact servicing dealer if oil level is correct. * OVERCRANK: Clear alarm. Attempt to start the unit in MANUAL. If it does not start or starts and runs rough, contact servicing dealer. * OVERSPEED: Contact servicing dealer. * UNDER VOLTAGE: Contact servicing dealer. * UNDERSPEED: Contact servicing dealer. * MISWIRE: Contact servicing dealer. * OVERVOLTAGE: Contact servicing dealer.

Generac Power Systems 27 kW Specifications

General

Rated Wattage	27 kW
Voltage	120/240 V
Frequency	60 Hz
Power Output	27, 000 Watts
Fuel Type	Liquid Propane / Natural Gas
Phase	Single Phase
Engine Displacement	2.4L
Noise Level	67 dB at 23 ft
Warranty	5-Year Limited

Summary

Section 1 Safety

1.2 Safety Information

Details general safety rules and precautions for operating and maintaining the generator.

1.3 General Hazards

Covers hazards related to installation, exhaust, electrical systems, and moving parts.

1.4 Exhaust Hazards

Highlights risks of carbon monoxide and requirements for outdoor installation.

1.5 Electrical Hazards

Explains electrical shock risks and safe practices for operation and servicing.

1.6 Fire Hazards

Outlines proper installation and essential fire safety measures.

1.7 Explosion Hazards

Addresses risks associated with flammable materials and potential explosions.

Section 2 Specifications

2.1 Emission Information

Details EPA requirements and certifications for generator emissions.

2.2 Specifications

Provides technical data and performance characteristics for various generator models.

2.3 Engine Oil Recommendations

Guidance on recommended engine oil types, grades, and change intervals.

2.7 Reconfiguring the Fuel System

Instructions for changing the generator's fuel system configuration.

2.7.1 Fuel Conversion Procedure from NG to LPV

Step-by-step guide for converting the generator from Natural Gas to LPV.

Section 3 Activation and Startup

3.3 Install Battery

Step-by-step procedure for correctly and safely installing the generator battery.

3.5 Activate Unit

Guide to activating the generator's control unit and initial setup.

3.6 Start and Run Engine

Instructions for manually starting and stopping the generator engine.

3.7 Operational Checks

Procedures for performing essential checks before and during operation.

3.7.1 Self Test

Performing the controller's system self-test for diagnostics.

3.7.2 Check Manual Transfer Switch Operation

3.7.3 Electrical Checks

3.7.4 Test Generator Under Load

Procedure for testing the generator's performance under electrical load.

3.7.5 Check Automatic Operation

Verifying the generator's automatic response to utility power failure.

Section 4 Operation

4.1 Control Panel

4.2 AutoManualOff

4.3 Menu Navigation

4.4 AlarmWarning Conditions

Lists and explains various alarm and warning messages displayed by the system.

4.9 Transfer Switch Automatic Operation

How the generator automatically operates during utility power outages.

4.9.1 Automatic Sequence of Operation

Step-by-step sequence of automatic generator startup and load transfer.

4.10 Transfer Switch Manual Operation

Procedures for manually controlling the transfer switch.

4.10.1 Transfer to Generator Power

4.10.2 Transfer Back to Utility Power

Section 5 Maintenance

5.3 Service Maintenance Intervals

Schedule outlining routine maintenance tasks and their frequencies.

5.4 Remove From Service

5.5 30 Hour Break-In

5.6 Daily Maintenance

5.7 Schedule A Maintenance

Details for annual or 125-hour service tasks.

5.7.5 Check Coolant Level and Hoses

5.7.6 Check Radiator for Clogging

5.7.7 Check Lubricating Oil Level and Drain Hose

5.7.8 Replace Lubricating Oil and Oil Filter

Procedure for changing the engine's lubricating oil and oil filter.

5.7.9 Check Battery ConditionFluid Level

5.7.9.4 Battery Replacement

5.7.10 Check and Adjust AccessoryDrive Belt

5.7.11 Replace Air Filter Element

5.8 Schedule B Maintenance

Details for bi-annual or 250-hour service tasks.

5.8.2 DrainFlush Coolant System

5.8.3 CleanGapReplace Spark Plugs

5.9 Schedule C Maintenance

Details for 1000-hour service tasks.

5.10 Return To Service

Section 6 Troubleshooting

6.1 Engine Troubleshooting

Common engine-related problems and their corresponding solutions.

6.2 Controller Troubleshooting

Troubleshooting controller alarms, warnings, and operational issues.

6.3 Removal From Service During Utility Outages

6.4 Storage

6.4.1 Prepare For Storage

6.4.2 Return From Storage

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