Generac Guardian Series Residential Standby Generators

8/11 kW Air-Cooled Gas Engine

Product Overview

The Generac Guardian Series offers reliable residential standby generators designed to provide backup power during utility outages. These air-cooled gas engine units feature advanced technology for performance and durability.

What's Included

True Power™ Electrical Technology
Two Line LCD Multilingual Digital Evolution™ Controller (Supports English, Spanish, French, Portuguese)
Two Transfer Switch Options: 50 Amp Pre-Wired Switch or 200 Amp Service Rated Switch (See Page 4 for Details)
Electronic Governor
External Main Circuit Breaker
System Status & Maintenance Interval LED Indicators
Sound Attenuated Enclosure
Flexible Fuel Line Connector
Composite Mounting Pad
Natural Gas or LP Gas Operation
5 Year Limited Warranty
Capability to be installed within 18 inches (457 mm) of a building*

*Installation clearance requires location away from doors, windows, and fresh air intakes, and adherence to local codes.

Key Features

Innovative Design & Prototype Testing: Generac's commitment to rigorous testing ensures superior performance and reliability. This includes component, reliability, environmental, destruction, and life testing, adhering to applicable CSA, NEMA, EGSA, and other standards.
True Power™ Electrical Technology: Delivers superior harmonics and a sine wave form with less than 5% Total Harmonic Distortion for utility-quality power. This ensures confident operation of sensitive electronic equipment and micro-chip based appliances, such as variable speed HVAC systems.
Test Criteria: Units are rigorously tested, including Prototype Tested, System Torsional Tested, NEMA MG1-22 Evaluation, and Motor Starting Ability.
Solid-State, Frequency Compensated Voltage Regulation: This advanced system provides optimized fast response to changing load conditions and maximum motor starting capability by electronically torque-matching surge loads to the engine. It offers digital voltage regulation at ±1%.
Single Source Service Response: Generac's extensive dealer network provides comprehensive parts and service support for the entire unit.
Generac Transfer Switches: Designed for long life and reliability, Generac offers integrated transfer systems and controls for complete system compatibility.

Standby Power Ratings

Model Series	Fuel Type	Standby Power Rating
006237-0, 006245-0 (Steel - Bisque)	8 kW 60 Hz	8,000 Watts (LP) / 7,000 Watts (NG)
006437-1, 006438-2, 006439-1 (Steel - Bisque)	11 kW 60 Hz	11,000 Watts (LP) / 10,000 Watts (NG)
006720-0 (Aluminum - Grey)	11 kW 60 Hz	11,000 Watts (LP) / 10,000 Watts (NG)

Note: CUL certification applies to unbundled units and units packaged with pre-wired switches. Units packaged with the Smart Switch are UL certified in the USA only.

Generator Visual

The product features an image of a Generac Guardian Series air-cooled gas engine standby generator, model 006720-0, presented in a grey aluminum enclosure.

Engine Features and Benefits

Generac (OHVI) Design: Maximizes engine "breathing" for increased fuel efficiency. Plateau honed cylinder walls and plasma moly rings help the engine run cooler, reducing oil consumption and resulting in longer engine life.
"Spiny-lok" Cast Iron Cylinder Walls: Rigid construction and added durability provide long engine life.
Electronic Ignition/Spark Advance: Ensures smooth, quick starting every time.
Full Pressure Lubrication System: Pressurized lubrication to all vital bearings means better performance, less maintenance, and longer engine life. Features up to a 2 year/200 hour oil change interval.
Low Oil Pressure Shutdown System: Prevents catastrophic engine damage due to low oil.
High Temperature Shutdown: Prevents damage due to overheating.

Generator Features and Benefits

Revolving Field: Allows for a smaller, lighter unit that operates 25% more efficiently than a revolving armature generator.
Skewed Stator: Produces a smooth output waveform for compatibility with electronic equipment.
Displaced Phase Excitation: Maximizes motor starting capability.
Automatic Voltage Regulation: Regulates output voltage to ±1%, preventing damaging voltage spikes.
UL 2200 Listed: For your safety.

Transfer Switch Features

Fully Automatic: Transfers your vital electrical loads to the energized source of power.
Pre-wired, Color-Coded Conduits (Pre-wired switches only): Ensures the easiest, trouble-free installation.
Remote Mounting: Mounts near your existing distribution panel for simple, low-cost installation.

Evolution™ Controls Features

Auto/Manual/Off Illuminated Buttons: Selects operating mode and provides easy, at-a-glance status indication.
Two-Line LCD Multilingual Display: Provides easily visible logs of history, maintenance, and events (up to 50 occurrences).
Sealed, Raised Buttons: Offers a smooth, weather-resistant user interface for programming and operations.
Utility Voltage Sensing: Constantly monitors utility voltage, with setpoints for 60% dropout and 80% pick-up.
Generator Voltage Sensing: Constantly monitors generator voltage for clean power delivery.
Utility Interrupt Delay: Prevents nuisance engine start-ups, adjustable from 2-1500 seconds.
Engine Warm-up: Ensures the engine is ready to assume the load (approx. 5 seconds).
Engine Cool-down: Allows the engine to cool before shutdown (approx. 1 minute).
Programmable Exerciser: Runs the generator for 12 minutes every other week (or weekly/monthly) to prevent oil seal drying and maintain readiness, offering flexibility and lower fuel costs.
Smart Battery Charger: Delivers charge only when needed, adapting to outdoor air temperature.
Main Line Circuit Breaker: Protects the generator from overload.
Electronic Governor: Maintains a constant 60 Hz frequency.

Unit Features

SAE Weather Protective Enclosure: Ensures quiet operation and protection against weather, withstanding winds up to 150 mph. Features a hinged key locking roof panel for security, lift-out front for maintenance access, and durable electrostatically applied textured epoxy paint.
Enclosed Critical Grade Muffler: Mounted inside the unit to prevent injuries.
Small, Compact, Attractive: Designed for easy, eye-appealing installation, as close as 18 inches away from a building.

Installation System

1 ft (305 mm) Flexible Fuel Line Connector: Absorbs generator vibration when connected to rigid pipe.
Composite Mounting Pad: Eliminates the need to pour a concrete pad unless required by local municipalities.

Specifications

Generator Specifications

	006237-0, 006245-0 (8 kW)	006437-1, 006438-2, 006439-1 (11 kW)
Rated Maximum Continuous Power Capacity (LP)	8,000 Watts*	11,000 Watts*
Rated Maximum Continuous Power Capacity (NG)	7,000 Watts*	10,000 Watts*
Rated Voltage	240	240
Rated Maximum Continuous Load Current – 240 Volts (LP/NG)	33.3/29.2	45.8/41.7
Total Harmonic Distortion	Less than 5%	Less than 5%
Main Line Circuit Breaker	35 Amp	50 Amp
Phase	1	1
Number of Rotor Poles	2	2
Rated AC Frequency	60 Hz	60 Hz
Power Factor	1.0	1.0
Battery Requirement (not included)	Group 26R, 12 Volts and 525 CCA Minimum	Group 26R, 12 Volts and 525 CCA Minimum
Unit Weight (lb/kg)	360/163.3	407/184.6
Dimensions (L x W x H) in/mm	48 x 25 x 29 / 1218 x 638 x 732	48 x 25 x 29 / 1218 x 638 x 732
Sound output in dB(A) at 23 ft (7 m) at normal load**	62	63
Exercise Duration	12 min	12 min

*Maximum wattage and current are subject to factors like fuel content, ambient temperature, altitude, and engine condition. Power decreases with altitude and higher temperatures.

**Sound levels are taken from the front of the generator. Other sides may have higher levels depending on installation.

Engine Specifications

	GENERAC OHVI	GENERAC OHVI V-TWIN
Type of Engine	GENERAC OHVI	GENERAC OHVI V-TWIN
Number of Cylinders	1	2
Displacement	410 cc	530 cc
Cylinder Block	Aluminum w/ Cast Iron Sleeve	Aluminum w/ Cast Iron Sleeve
Valve Arrangement	Overhead Valve	Overhead Valve
Ignition System	Solid-state w/ Magneto	Solid-state w/ Magneto
Governor System	Electronic	Electronic
Compression Ratio	9.5:1	9.5:1
Starter	12 Vdc	12 Vdc
Oil Capacity Including Filter	Approx. 1.5 qt/1.4 L	Approx. 1.7 qt/1.6 L
Operating rpm	3,600	3,600
Fuel Consumption (Natural Gas)	1/2 Load: 78 ft³/hr (2.21 m³/hr) Full Load: 121 ft³/hr (3.43 m³/hr)	1/2 Load: 124 ft³/hr (3.51 m³/hr) Full Load: 195 ft³/hr (5.52 m³/hr)
Fuel Consumption (Liquid Propane)	1/2 Load: 31.6 (0.87) [3.29] ft³/hr (gal/hr) [l/hr] Full Load: 51.6 (1.42) [5.37] ft³/hr (gal/hr) [l/hr]	1/2 Load: 42.8 (1.18) [4.45] ft³/hr (gal/hr) [l/hr] Full Load: 70 (1.92) [7.28] ft³/hr (gal/hr) [l/hr]

Note: Fuel pipe must be sized for full load. Required fuel pressure to generator fuel inlet: 3.5-7" water column (7-13 mm mercury) for natural gas, 10-12" water column (19-22 mm mercury) for LP gas.

Controls Specifications

2-Line Plain Text Multilingual LCD Display	Simple user interface for ease of operation.
Mode Buttons: Auto, Manual, Off	Automatic Start on Utility failure (Auto). Start with starter control (Manual). Stops unit (Off).
Ready to Run/Maintenance Messages	Standard
Engine Run Hours Indication	Standard
Programmable Start Delay	Adjustable 2-1500 seconds (factory default 5 seconds).
Utility Voltage Loss/Return to Utility	Monitors utility voltage, adjustable settings (e.g., brownout).
Exerciser/Exercise Set Error Warning	Programmable exerciser runs generator for 12 minutes every other week (or weekly/monthly).
Run/Alarm/Maintenance Logs	Stores up to 50 events.
Engine Start Sequence	Cyclic cranking: max five times at factory set intervals.
Starter Lock-out	Starter cannot re-engage until 5 seconds after engine has stopped.
Smart Battery Charger	Charges battery only when needed, adapts to temperature.
Charger Fault/Missing AC Warning	Standard
Low Battery/Battery Problem Protection	Standard
Automatic Voltage Regulation	With Over and Under Voltage Protection.
Under-Frequency/Overload/Stepper Overcurrent Protection	Standard
Safety Fused/Fuse Problem Protection	Standard
Automatic Low Oil Pressure/High Oil Temperature Shutdown	Standard
Overcrank/Overspeed/rpm Sense Loss Shutdown	Standard
High Engine Temperature Shutdown	Standard
Internal Fault/Incorrect Wiring Protection	Standard
Common External Fault Capability	Standard
Field Upgradable Firmware	Standard

Switch Options

Pre-Wired Switch Features

Electrically operated, mechanically-held contacts for fast, positive connections.
Rated for all classes of load, 100% equipment rated (inductive and resistive).
2 pole, 250 VAC contactors.
30 millisecond transfer time.
Single coil design.
Main contacts are silver plated or silver alloy to resist welding and sticking.
NEMA 1 (indoor rated) enclosure is standard.
Includes a 30-foot (9.1 meter) pre-wired whip to connect to the provided 5-foot pre-wired whip and external connection box.
Includes a 2-foot (0.61 meter) pre-wired whip, color-coded to connect into the existing electrical panel.

50 Amp Pre-Wired Switch Specifications

	006237-0 (8 kW)	006437-1 (11 kW)
Model	006237-0 (8 kW)	006437-1 (11 kW)
No. of Poles	2	2
Current Rating (Amps)	50	50
Voltage Rating (VAC)	250	250
Utility Voltage Monitor (Fixed)	Pick-up: 80% Dropout: 60%	Pick-up: 80% Dropout: 60%
Return to Utility*	approx. 15 sec	approx. 15 sec
Exerciser weekly for 12 minutes*	Standard	Standard
UL Listed	Standard	Standard
Total of Pre-wired Circuits	10	12
No. 15 A 120 V	3	5
No. 20 A 120 V	3	3
No. 20 A 240 V	1	1
No. 30 A 240 V	1	1
No. 40 A 240 V	-	1
No. 50 A 240 V	-	1
Circuit Breaker Protected Available RMS Symmetrical Fault Current @ 250 Volts	10,000	10,000

*Function of Evolution Controller

50 Amp Switch Mechanical Dimensions

	Height			Width			Depth
	H1	H2	H3	W1	W2	W3	Depth
in	18.5	22.5	22	10.5	15.4	14.4	3.8
mm	470	571.8	558.8	266.7	392	366	97.5

Note: The 50 amp switch is flush mountable. H1 and W1 refer to mounting hole spacing. H2 and W2 are cover dimensions. H3 and W3 are the enclosure dimensions without cover.

Wire Ranges

Conductor Lug	Neutral Lug	Ground Lug
1/0 - #14	2/0 - #14	2/0 - #14

Service Rated Switch Features (Available on 11 kW model only)

Electrically operated, mechanically-held contacts for fast, clean connections.
Rated for all classes of load, 100% equipment rated (inductive and resistive).
Service equipment rated, dual coil design.
Rated for both aluminum and copper conductors.
NEMA/UL 3R aluminum outdoor enclosure.
Main contacts are silver plated or silver alloy to resist welding and sticking.

200 Amp Open Transition Service Rated Switch Specifications

	006438-2 (11 kW)
Model	006438-2 (11 kW)
No. of Poles	2
Current Rating (Amps)	200
Voltage Rating (VAC)	250
Utility Voltage Monitor (Fixed)	Pick-up: 80% Dropout: 60%
Return to Utility*	approx. 13 sec.
Exerciser weekly for 12 minutes*	Standard
UL Listed	Standard
Enclosure Type	NEMA/UL 3R
Withstand Rating (Amps)	22,000
Lug Range	250 MCM - #6