20 kW Generator Generac Guardian


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Continuous Standby Power Rating Models:
15kW 60 Hz 04721 (15kW/Single Phase NG or LPV)
04722 (15kW/Single Phase NG or LPV) 20kW 60 Hz
04723 (20kW/Single Phase NG or LPV)
04724 (20kW/Single Phase NG or LPV) UL 2200 Listed
2 Year Limited Warranty

Quiet, powerful, liquid-cooled engine fueled by natural gas or LP gas.

A standard weather protective enclosure protects generator from harmful weather and also reduces exterior noise levels. Includes key locks for security.

Built-in charger maintains battery at optimum performance level.

Automatic safety shutdowns protect engine and generator in event of low oil pressure, high temperature, overspeed and/or overcrank.

Automatic seven-day exerciser runs the system for fifteen minutes each week to maintain top running condition.

Standard 100-amp remote-mounted automatic transfer switch for fast and efficient unattended transfer to generator when utility source fails

Power Matched Naturally Aspirated Generac 100 Amp Automatic Transfer Switch (UL Listed) Included with Models 04721 04723. Available for models 04722 & 04724 - 2 Year Limited Warranty.

Model

04721

04723

Rated Power (kW)*

60 Hz Phase

Single

Voltage

120/240V

Amps @ 120/240V, Single Phase 60 Hz

125/62.5

166.6/83.3

Engine / Alternator RPM

1800

3600

Engine

1.5L OHC 4 cyl.

Fuel

Natural gas or LP gas

UL 2200 Listed

Yes

CSA Listed

Yes

Main Line Circuit Breaker

70 Amp

90 Amp

Engine Cooling

Liquid

Dimensions (L" x W" x H")

68 x 30 x 40

Unit Wt. (lbs.)**

980

985

Start/Stop Control

Cyclic cranking: 7 seconds on, 7 seconds rest. 90 seconds overcrank protection.

Automatic Low Oil Shutdown

Standard

Overspeed Shutdown

Standard, 70 Hz

Overcrank Protection

Standard

Automatic Voltage Regulator with Over-Voltage Protection

Standard

Engine Warmup

15 seconds

Engine Cool-Down

1 minute

Safety Fuse

Standard

Safety Fuse

Standard

Starter Lockout

Starter cannot re-engage until 5 seconds after engine has stopped

2 Amp Timed Trickle Battery Charger

Standard

Auto Switch

Utility failure/7 day exercise

Off Switch

Stops unit. Power is removed. Control and charger still operate

Manual / Test

Start with starter control, unit stays on. If utility fails, transfer to load takes place

** Includes Transfer Switch

INNOVATIVE DESIGN & PROTOTYPE TESTING are key components of

GENERAC’S success in “IMPROVING POWER BY DESIGN.” But it doesn’t stop there. Total commitment to component testing, reliability testing, environmental testing, destruction and life testing, plus testing to applicable CSA, NEMA, EGSA, and other standards, allows you to choose GENERAC POWER SYSTEMS with the confidence that these systems will provide superior performance.

- TEST CRITERIA:

- PROTOTYPE TESTED

- SYSTEM TORSIONAL TESTED

- ELECTRO-MAGNETIC INTERFERENCE

- NEMA MG1-22 EVALUATION

- MOTOR STARTING ABILITY

SOLID-STATE, FREQUENCY COMPENSATED VOLTAGE REGULATION.

This state-of-the-art power maximizing regulation system is standard on all Generac models. It provides optimized FAST RESPONSE to changing load conditions and MAXIMUM MOTOR STARTING CAPABILITY by electronically torque-matching the surge loads to the engine.

- SINGLE SOURCE SERVICE RESPONSE from Generac’s dealer network provides parts and service know-how for the entire unit, from the engine to the smallest electronic component. You are never on your own when you own a GENERAC POWER SYSTEM.

- GENERAC TRANSFER SWITCHES. Long life and reliability are synonymous with GENERAC POWER SYSTEMS. One reason for this confidence is that the GENERAC product line includes its own transfer systems and controls for total system compatibility.

APPLICATION & ENGINEERING DATA Home Standby - 20 Home Standby 15

GENERATOR SPECIFICATIONS

TYPE Home Standby 15 .......................................... Four-pole, revolving field

TYPE Home Standby 20 ........................................... Two-pole, revolving field

ROTOR INSULATION ....................................................................... Class F

STATOR INSULATION ...................................................................... Class F

VOLTAGE WAVE FORM DEVIATION .................................................... <5%

TOTAL HARMONIC DISTORTION (line to line) .................................... <5%

TELEPHONE INTERFERENCE FACTOR (TIF) ..................................... <50

ALTERNATOR ................................................. Self-ventilated and drip-proof

BEARINGS (PRE-LUBED & SEALED) ....................................................... 1

COUPLING .................................................................... Direct, Flexible Disc

LOAD CAPACITY (STANDBY) ............................................................. 100%

NOTE: Emergency loading in compliance with NFPA 99, NFPA 110,

paragraph 5-13.2.6. Generator rating and performance in accordance

with ISO8528-5, BS5514, SAE J1349, ISO3046, and DIN6271 standards.

EXCITATION SYSTEM

DIRECT .................................................................. DC excitation system

Low-velocity brushes and slip rings

REGULATION ......................................................................... Solid-state

±1% regulation

GENERATOR FEATURES

> Two/Four pole, revolving field generator, directly connected to the engine

shaft through a heavy-duty, flexible disc for permanent alignment.

> Generator meets temperature rise standards for class “F” insulation as

defined by NEMA MG1-22.

> Stator windings are “trickle” varnished and rotor windings are “roll-dipped”

for complete impregnation.

> Unit tested for motorstarting ability by measuring instantaneous voltage

dip with a waveform data acquisition system.

All models utilize an advanced wire harness design for reliable interconnection

within the circuitry.

> Magnetic circuit, including amortisseur windings, tooth and skewed stator

design, provides a minimal level of waveform distortion and an electromagnetic

interference level which meets accepted requirements for standard AM radio,

TV, and marine radio telephone applications.

>Voltage waveform deviation, total harmonic content of the AC waveform,

and balanced T.I.F. (Telephone Influence Factor) have been evaluated to

acceptable standards in accordance with NEMA MG1-22.

> Alternator is of drip-proof guarded construction.

> Fully life-tested protective systems, including “field circuit and thermal

overload protection” and standard mainline circuit breakers capable of

handling full output capacity.

> System torsional acceptability confirmed during prototype testing.

ENGINE SPECIFICATIONS

MAKE .......................................................................................... GENERAC

MODEL ....................................................................................... MMC 4G15

CYLINDERS ..................................................................................... 4 in-line

DISPLACEMENT ........................................................ 1.5 Liter (91.5 cu. in.)

BORE ............................................................................... 75.5 mm (2.97 in.)

STROKE ............................................................................. 82 mm (3.23 in.)

COMPRESSION RATIO ........................................................................ 9:4:1

INTAKE AIR ................................................................... Naturally Aspirated

NUMBER OF MAIN BEARINGS ................................................................ 5

CONNECTING RODS .................................................... 4-Drop forged steel

CYLINDER HEAD ........................................................................... S.O.H.C.

PISTONS .......................................................................... 4-Aluminum Alloy

CRANKSHAFT ................................................................ Drop Forged Steel

VALVE TRAIN

LIFTER TYPE .................................................................... Rocker Arm Type

INTAKE VALVE MATERIAL ......................... High Temperature Alloy Forged

EXHAUST VALVE MATERIAL ..................... High Temperature Alloy Forged

VALVE SEATS ........................................................................... Replaceable

ENGINE GOVERNOR

ELECTRONIC.............................................................................. Standard

FREQUENCY REGULATION, NO-LOAD TO FULL LOAD ............ 0.5%

STEADY STATE REGULATION .................................................. ±0.25%

LUBRICATION SYSTEM

TYPE OF OIL PUMP ............................................................................ Gear

OIL FILTER ...................................................................... Full flow, cartridge

CRANKCASE CAPACITY .................................................. 3.8 Liters (4 qts.)

COOLING SYSTEM

TYPE OF SYSTEM ........................................ Pressurized, closed recovery

WATER PUMP .......................................................... Pre-lubed, self-sealing

TYPE OF FAN ................................................................................... Pusher

NUMBER OF FAN BLADES ....................................................................... 6

DIAMETER OF FAN ......................................................... 380 mm (15.0 in.)

COOLANT HEATER ........................................................................... 500 W

FUEL SYSTEM

FUEL

Natural Gas or L.P. Vapor .......................................................... Standard

CARBURETOR ............................................................................ Down draft

SECONDARY FUEL REGULATOR. Nat. Gas or L.P. Vapor Systems

AUTOMATIC FUEL LOCKOFF SOLENOID ................................... Standard

OPERATING FUEL PRESSURE VAPOR SYSTEMS ..Nat. Gas 5 to 14” H2O

LP Vapor.....11” to 14” H2O

ELECTRICAL SYSTEM

BATTERY CHARGE ALTERNATOR ................................... 15 Amps at 12 V

STARTER MOTOR .................................................................................. 12 V

RECOMMENDED BATTERY ............... 12 V, 525 CCA @ 0o F/75 A.H., 26R

GROUND POLARITY ..................................................................... Negative

Rating definitions - Standby: Applicable for supplying emergency power for the duration of the utility power outage. No overload capability is available for this rating. (All ratings in accordance with BS5514, ISO3046 and DIN6271). Maximum wattage and current are subject to and limited by such factors as fuel Btu content, ambient temperature, altitude, engine power and condition, etc.

STANDBY

Home Standby-15

Home Standby-20

Rated

GENERATOR OUTPUT VOLTAGE/KW - 60Hz 120/240V, 1-phase, 1.0 pf

N.G./L.P.

AMP

N.G./L.P.

AMP

62.5

83.3

MOTORSTARTING

Maximum at 35% instantaneous voltage dip

with standard alternator; 60 Hz

28 KVA

39 KVA

FUEL

N.G.

L.P.

N.G.

L.P.

ft.3 /hr.(gal./hr.) Fuel consumption - 60 Hz--100% Load

265

110 (3.0)

369

153 (4.2)

m3 /hr.

7.5

3.1

10.4

4.3

COOLING

Coolant capacity

System lit.(US gal.)

7.5 (2)

Engine lit.(US gal.)

0.9 (0.25)

Radiator lit.(US gal.)

6.6 (1.75)

Coolant flow/min.

60 Hz lit.(US gal.)

25 (6.6)

40 (10.6)

Heat rejection to coolant

60 Hz BTU/hr.

72,000

96,000

Cooling air flow

60 Hz m3/min. (cfm)

40 (883)

45 (1590)

COMBUSTION AIR REQUIREMENTS

Flow at rated power 60 Hz m3/min. (cfm)

1.2 (41)

1.6 (57)

EXHAUST

Exhaust flow at rated output 60 Hz m3/min.

(cfm)

3.9 (137)

6.0 (212)

Max. recommended back pressure

Kpa (Hg)

5.0 (1.5")

Exhaust temp. at rated output

°C (°F)

621 (1150)

704 (1300)

Exhaust outlet size

N.P.T. (female)

1.5"

ENGINE

Rated at RPM

60 Hz

1800

3600

HP at rated KW

60 Hz

Piston speed

60 Hz m/min. (ft./min.)

295 (969)

590 (1937)

BMEP

60 Hz

116

FOR AMBIENT CONDITIONS

Temperature

-1.65% for every 10°F above - °F

Altitude

-3% for every 1000 ft. above - ft.

600

SOUND OUTPUT

In dB(A) at 23 feet with generator operating at full load

TRANSFER SWITCH SPECIFICATIONS (If so equipped)

No. of Poles

Current Rating (amps)

100

Voltage Rating (VAC)

250

Utility Voltage Monitor (fixed)

Pick-up

80%

Enclosure - NEMA 3R

Standard

Dropout

60%

Return to Utility

1 minute

Exerciser 15 minutes weekly

Standard

UL Listed

Standard

Dimensions (H" x W" x D")

20 x 15 x 7

Weight

35 lbs.

STANDARD ENGINE & SAFETY FEATURES

Home Standby - 15 Home Standby - 20

High Coolant Temperature Automatic Shutdown Battery Charge Alternator

Low Coolant Level Automatic Shutdown Battery Cables

Low Oil Pressure Automatic Shutdown Battery Tray

Overspeed Automatic Shutdown (Solid-state) Vibration Isolation of Unit to Mounting Base

Crank Limiter (Solid-state) 12 Volt, Solenoid-Activated Starter Motor

Oil Drain Extension Air Cleaner

Radiator Drain Extension Fan Guard

Factory-Installed Cool Flow Radiator Control Console

Closed Coolant Recovery System UV/Ozone Resistant Hoses

Stainless Steel Flexible Exhaust Connection Battery Trickle Charger

Rubber-Booted Engine Electrical Connections Flexible Fuel Line

Fuel Lockoff Solenoid Critical Exhaust Silencer

Isochronous Governor Main Line Circuit Breaker

Secondary Fuel Regulator (N.G. and L.P.) Automatic Transfer Switch

Weather Protective Enclosure (Locking Type) (Included with models 04721 & 04723 only)

Battery Charge Alternator

Battery Cables

Battery Tray

Vibration Isolation of Unit to Mounting Base

12 Volt, Solenoid-Activated Starter Motor

Air Cleaner

Fan Guard

Control Console

UV/Ozone Resistant Hoses

Battery Trickle Charger

Flexible Fuel Line

Critical Exhaust Silencer

Main Line Circuit Breaker

Automatic Transfer Switch

(Included with models 04721 & 04723 only)

Guardian 15 & 20 kW Standby Generator

Guardian | Guardian Elite | QuietSource | Commercial | Specs | Transfer Switches | Pricing | Email

Continuous Standby Power Rating Models:
15kW 60 Hz 04721 (15kW/Single Phase NG or LPV)
04722 (15kW/Single Phase NG or LPV) 20kW 60 Hz
04723 (20kW/Single Phase NG or LPV)
04724 (20kW/Single Phase NG or LPV) UL 2200 Listed
2 Year Limited Warranty

Guardian 15 & 20 kW Standby Generator

Guardian | Guardian Elite | QuietSource | Commercial | Specs | Transfer Switches | Pricing | Email

Continuous Standby Power Rating Models: 15kW 60 Hz 04721 (15kW/Single Phase NG or LPV) 04722 (15kW/Single Phase NG or LPV) 20kW 60 Hz 04723 (20kW/Single Phase NG or LPV) 04724 (20kW/Single Phase NG or LPV) UL 2200 Listed 2 Year Limited Warranty

Continuous Standby Power Rating Models:
15kW 60 Hz 04721 (15kW/Single Phase NG or LPV)
04722 (15kW/Single Phase NG or LPV) 20kW 60 Hz
04723 (20kW/Single Phase NG or LPV)
04724 (20kW/Single Phase NG or LPV) UL 2200 Listed
2 Year Limited Warranty