Kohler 8.5, 12RES User Manual
Model: 8.5/12RES
Multi-Fuel
LP Vapor/Natural Gas
Standard Features
D ADC-RES Advanced Digital Control
d Designed for today’s most sophisticated electronics
d Electronic speed control responds quickly to varying
household demand
d Digital voltage regulation protects your sensitive
electronics from harmonic distortion and unstable power
quality
d LED display shows system status and setup information
D Engine Features
d Kohler Command PROr OHV engine with hydraulic
valve lifters for reliable performance without routine
valve adjustment or lengthy break-in requirements
d Digital Spark Advance Ignition (DSAI) optimizes engine
performance for natural gas and LP vapor fuels (12RES
only)
The KohlerrAdvantage
D The Smart Choice
Known for its reliability, the Kohler 12 kW generator set
was named a “Best Buy” as well as the highest-rated
generator in a leading consumer magazine in October,
2006
D Powerful
Exclusive Powerboostt technology allows the Kohler
12 kW generator to start and run a typical 4 ton
(48,000 BTU) central air conditioner, while still running
other home appliances and electronics *
D Clean Power for Sensitive Electronics
Protects sophisticated electronics with clean, stable power
that exceeds strict utility requirements and IEEE standards
for total harmonic distortion (THD)
D Fast Response
Kohler generator sets restore power in as little as 10
seconds
D Quiet
Quiet operation: 65 dB(A) at 7 m maintains neighborhood
solitude
D Premium Five-Year Limited Warranty
d Simple field conversion between natural gas and LP
vapor fuels while maintaining emission certification
D Designed for Easy Installation
d Polymer base eliminates the need for a concrete
mounting pad, reducing installation time and cost
d Fuel and electrical connections through the enclosure
wall eliminate the need for stub-ups through the bottom
d Load connection terminal block allows easy field wiring
d Designed for outdoor installation only
D Certifications
d Meets emission regulations for U.S. Environmental
Protection Agency (EPA) with both natural gas and
LPG.
Note: CARB does not regulate emergency standby
generators outputting less than 50 HP. Only the EPA
standards apply.
d UL 2200 listed (60 Hz models)
d CSA certification available (60 Hz models)
d Accepted by the Massachusetts Board of Registration of
Plumbers and Gas Fitters
D Warranty
d 5-year / 2000 hour warranty for on-grid (standby)
applications in locations served by a reliable utility
source
d 18 month/ 1000 hour warranty for off-grid (non-standby)
applications
Generator Ratings
Standby Ratings
Natural Gas LP Gas
Model Vol t age Phase Hz Alternator
8.5RES
8.5RES 115/230 1 50 2F4 6.3/6.3 27 7.5/7.5 33
12RES 120/240 1 60 2F4 10.4/10.4 43 12.0/12.0 50
12RES 115/230 1 50 2F4 9.3/9.3 40 10.5/10.5 46
RATINGS: Standby ratings apply to installations served by a reliable utility source. All single-phase units are rated at 1.0 power factor. The standby rating is applicable to variable loads with an average
load factor of 80% for the duration of the power outage. No overload capacity is specified at this rating. Ratings are in accordance with ISO--3046/1, BS5514, AS2789, and DIN 6271. GENERAL
GUIDELINES FOR DERATING: ALTITUDE: Derate 4% per 305 m (1000 ft.) elevation above 153 m (500 ft.). TEMPERATURE: Derate 1.5% per 5.5_C(10_F) temperature increase above 16_C
(60_F). Availability is subject to change without notice. The generator set manufacturer reserves the right to change the design or specifications without notice and without any obligation or liability
whatsoever. Contact your local Kohler Co. generator distributor for availability.
* Due to the cycling operation of many electrical appliances, the generator set may not run all appliances simultaneously. Check the appliance manufacturer’s specifications for actual power
requirements. Consult a Kohlerr Power Systems professional for your exact residential power system requirements.
120/240 1 60 2F4 7.0/7.0 29 8.5/8.5 35
G4-97 (8.5/12RES) 4/14n
kW/kVA Amps kW/kVA Amps
Application Data
g
A
Engine
Engine Specifications 60 Hz 50 Hz
Manufacturer Kohler
Engine: model, type
8.5RES CH640 4-Cycle
12RES CH740 4-Cycle
Cylinder arrangement V-2
Displacement, L (cu. in.)
8.5RES 0.624 (38)
12RES 0.725 (44)
Bore and stroke, mm (in.)
8.5RES 77 x 67 (3.03 x 2.64)
12RES 83 x 67 (3.27 x 2.64)
Compression ratio
8.5RES 8.5:1
12RES 9.0:1
Main bearings: quantity, type 2, Parent Material
Rated rpm 3600 3000
Max. engine power at rated rpm, kW (HP)
CH640, LP vapor 11.5 (15.4) 10 (14.0)
CH640, natural gas 10.0 (13.4) 9.1 (12.2)
CH740, LP vapor 17.6 (23.6) 15.8 (21.2)
CH740, natural gas 15.3 (20.5) 13.8 (18.5)
Cylinder head material Aluminum
Valve material
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)
Exhaust
Exhaust System 60 Hz 50 Hz
Exhaust flow at rated kW, m3/min. (cfm)
8.5RES 3.3 (115) 2.7 (96)
12RES 3.8 (135) 3.2 (113)
Exhaust temperature at rated kW, dry
exhaust, _C(_F)
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
Steel/Stelliter
525
760 (1400)
Operation Requirements
8.5RES 12RES
Coolin
Total inlet air,
3
m
Cooling air,
3
m
Combustion air,
3
m
ir
/min. (cfm)
/min. (cfm)
/min. (cfm)
60 Hz 50 Hz 60 Hz 50 Hz
27.8 (980) 23.2 (820) 28.0 (990) 23.4 (825)
26.9 (950) 22.4 (790) 26.9 (950) 22.4 (790)
0.9 (33.4) 0.8 (28.0) 1.1 (39.2) 0.9 (32.6)
Fuel Requirements
Fuel System
Fuel types Natural Gas or LP Vapor
Fuel supply inlet 1/2 NPT
Fuel supply pressure, kPa (in. H
Natural gas 1.2--2.7 (5-11)
LP 1.7--2.7 (7-11)
Minimum Gas Pipe Size Recommendation, in. NPT
8.5RES 12RES
Pipe
Length,
m (ft.)
8 (25) 3/4 1/2 3/4 3/4
15 (50) 3/4 3/4 1 3/4
30(100) 1111
46(150) 1 1 1 1/4 1
61(200) 1 1 1 1/4 1
Fuel Consumption at % rated load
% Load
Natural Gas, m3/hr. (cfh)
100% 3.7 (132) 3.3 (118) 5.4 (193) 4.8 (173)
75% 3.2 (113) 2.9 (101) 4.7 (163) 4.2 (148)
50% 2.6 (93) 2.3 (83) 3.5 (124) 3.1 (108)
25% 2.2 (77) 1.9 (69) 2.6 (93) 2.4 (84)
LP Vapor, m
100% 2.0 (72) 1.7 (61) 2.3 (81) 2.1 (74)
75% 1.3 (45) 1.1 (38) 2.1 (75) 1.9 (68)
50% 1.0 (36) 0.9 (31) 1.8 (60) 1.5 (53)
25% 0.8 (29) 0.7 (25) 1.2 (45) 1.1 (40)
LP Vapor, kg/hr. (lb./hr.)
100% 3.7 (8.4) 3.2 (7.1) 4.3 (9.4) 3.9 (8.6)
75% 2.4 (5.2) 2.1 (4.4) 3.9 (8.7) 3.6 (7.9)
50% 1.9 (4.2) 1.7 (3.6) 3.4 (7.0) 2.8 (6.2)
25% 1.5 (3.4) 1.3 (2.9) 2.2 (5.2) 2.1 (4.7)
LP vapor conversion factors:
Nominal fuel rating:
Natural Gas
(132,000
Btu/hr.)
8.5RES 12RES
60 Hz 50 Hz 60 Hz 50 Hz
3
/hr. (cfh)
3
8.58 ft.
0.535 m
36.39 ft.
Natural gas: 37 MJ/m
LP vapor: 93 MJ/m
=1lb.
3
=1kg
3
= 1 gal.
O):
2
LP Vapor
(180,000
Btu/hr.)
3
(1000 Btu/ft.3)
3
(2500 Btu/ft.3)
Natural Gas
(193,000
Btu/hr.)
LP Vapor
(203,000
Btu/hr.)
G4-97 (8.5/12RES) 4/14n
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