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

STANDBY

Home Standby-15

Home Standby-20

Rated

Rated

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

N.G./L.P.

AMP

N.G./L.P.

AMP

15

62.5

20

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)

7.5 (2)

Engine lit.(US gal.)

0.9 (0.25)

0.9 (0.25)

Radiator lit.(US gal.)

6.6 (1.75)

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")

5.0 (1.5")

Exhaust temp. at rated output

°C (°F)

621 (1150)

704 (1300)

Exhaust outlet size

N.P.T. (female)

1.5"

1.5"

ENGINE

Rated at RPM

60 Hz

1800

3600

HP at rated KW

60 Hz

24

32

Piston speed

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

295 (969)

590 (1937)

BMEP

60 Hz

116

78

FOR AMBIENT CONDITIONS

Temperature

-1.65% for every 10°F above - °F

77

77

Altitude

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

600

600

SOUND OUTPUT

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

75

81

TRANSFER SWITCH SPECIFICATIONS (If so equipped)

No. of Poles

2

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.