Spec Sheet

G4-248 (12RES) 10/20b
Application Data
Engine
Engine Specifications 60 Hz 50 Hz
Manufacturer Kohler
Engine: model, type CH740 4-Cycle
Cylinder arrangement V-2
Displacement, L (cu. in.) 0.725 (44)
Bore and stroke, mm (in.) 83 x 67 (3.27 x 2.64)
Compression ratio 9.0:1
Main bearings: quantity, type 2, Parent Material
Rated rpm 3600 3000
Max. engine power at rated rpm, kW (HP)
LPG 17.6 (23.6) 15.8 (21.2)
Natural gas 15.3 (20.5) 13.8 (18.5)
Cylinder head material Aluminum
Valve material
Steel/Stelliter
Piston type and material Aluminum Alloy
Crankshaft material Heat Treated, Ductile Iron
Governor: type Electronic
Frequency regulation, no load to full load Isochronous
Frequency regulation, steady state 0.5%
Air cleaner type Dry
Engine Electrical
Engine Electrical System
Ignition system Electronic, DSAM
Starter motor rated voltage (DC) 12
Battery charger, ampere rating 6
Battery (purchased separately):
Ground Negative
Volts (DC) 12
Battery quantity 1
Recommended cold cranking amps
(CCA) rating for - 18_C(0_F)
525
BCI group size 26
Exhaust
Exhaust System 60 Hz 50 Hz
Exhaust flow at rated kW, m
3
/min. (cfm) 3.8 (135) 3.2 (113)
Exhaust temperature at rated kW, dry
exhaust, _C(_F)
760 (1400)
Lubrication
Lubricating System
Type Full Pressure
Oil capacity (with filter), L (qt.) 1.9 (2.0)
Oil filter: quantity, type 1, Cartridge
Oil cooler Integral
Operation Requirements
Cooling Air 60 Hz 50 Hz
Total inlet air,
m
3
/min. (cfm)
28.0 (990) 23.4 (825)
Cooling air, m
3
/min. (cfm) 26.9 (950) 22.4 (790)
Combustion air , m
3
/min. (cfm) 1.1 (39.2) 0.9 (32.6)
Fuel Requirements
Fuel System
Fuel types Natural Gas or LPG
Fuel supply inlet 1/2 NPT
Fuel supply pressure, kPa (in. H
2
O):
Natural gas 0.9- 2.7 (3.5-11)
LPG 1.7- 2.7 (7-11)
Fuel Composition Limits *
Nat. Gas LPG
Methane, % by volume (minimum) 90 min. —
Ethane, % by volume (maximum) 4.0 max. —
Propane, % by volume 1.0 max. 85 min.
Propene, % by volume (maximum) 0.1 max. 5.0 max.
C
4
and higher, % by volume 0.3 max. 2.5 max.
Sulfur, ppm mass (maximum) 25 max.
Lower heating value,
MJ/m
3
(Btu/ft
3
), (minimum)
33.2 (890) 84.2 (2260)
* Contact your local distributor for suitability and r ating derates based
on fuel compositions outside these limits.
Minimum Gas Pipe Size Recommendation, in. NPT
Pipe Length,
m (ft.)
Natural Gas
(193,000 Btu/hr.)
LPG
(203,000 Btu/hr.)
8(25) 3/4 3/4
15 (50) 1 3/4
30(100) 1 1
46(150) 1 1/4 1
61(200) 1 1/4 1
Fuel Consumption at % rated load
%Load 60 Hz 50 Hz
Natural Gas, m
3
/hr. (cfh)
100% 5.4 (193) 4.8 (173)
75% 4.7 (163) 4.2 (148)
50% 3.5 (124) 3.1 (108)
25% 2.6 (93) 2.4 (84)
LPG, m
3
/hr. (cfh)
100% 2.3 (81) 2.1 (74)
75% 2.1 (75) 1.9 (68)
50% 1.8 (60) 1.5 (53)
25% 1.2 (45) 1.1 (40)
LPG, kg/hr. (lb./hr.)
100% 4.3 (9.4) 3.9 (8.6)
75% 3.9 (8.7) 3.6 (7.9)
50% 3.4 (7.0) 2.8 (6.2)
25% 2.2 (5.2) 2.1 (4.7)
LPG conversion factors:
8.58 ft.
3
=1lb.
0.535 m
3
=1kg
36.39 ft.
3
=1gal.
Nominal fuel rating:
Natural gas: 37 MJ/m
3
(1000 Btu/ft.
3
)
LPG: 93 MJ/m
3
(2500 Btu/ft.
3
)