This document provides specifications for a Kohler 125RZG natural gas/LP gas generator set. It includes details on the generator, engine, alternator, cooling system, fuel system, lubrication system, electrical system, air requirements, and fuel consumption. The generator set has a 130 degree C rise alternator, a GM 8.1L V8 engine, and can output up to 130kW in standby mode or 115kW in prime power mode.
NRP is a multifunction unit charged with R410a gas for the simultaneous but independent production of hot and cold water. The 2-pipe units are designed for applications where cold/hot water and domestic hot water is required throughout the year. The 4-pipe units are designed for systems where hot and cold water may be requested simultaneously. The machine is fitted with axial fans with reduced sound emissions, and scroll compressors with a high yield and low electricity absorption. The NRP has 3 heat exchangers: one on the environment side (finned pack copper/aluminium) and 2 indoor (shell and tube). NRP is ideal for small/medium-sized services in residential, commercial and industrial contexts. There are 3 versions - standard, low noise and high efficiency.
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1. Gas
Standard Features
D Kohler Co. provides one-source responsibility for the generating
system and accessories.
D The generator set and its components are prototype-tested,
factory-built, and production-tested.
D The 60 Hz generator set offers a UL-2200 listing.
D The generator set accepts rated load in one step.
D A one-year limited warranty covers all systems and components.
Two-, five-, and ten-year extended warranties are also available.
D Generator features:
d Kohler’s unique Fast-Responset excitation system delivers
the fastest voltage response in the industry.
d The brushless, rotating-field generator has broadrange
reconnectability.
d Kohler’s permanent magnet-excited generator (PMG) provides
superior short-circuit capability.
D Other features:
d A rugged industrial gas engine delivers rated power at
1800 rpm (60 Hz) and 1500 rpm (50 Hz).
d Controllers are available for all applications. See controller
features inside.
d The electronic, isochronous governor incorporates an
integrated drive-by-wire throttle body actuator delivering
precise frequency regulation.
190--600 V
RATINGS: All three-phase units are rated at 0.8 power factor. All single-phase units are rated at 1.0 power factor. Standby Ratings: Standby ratings apply to installations served by a reliable utility source.
The standby rating is applicable to varying loads for the duration of a power outage. There is no overload capability for this rating. Ratings are in accordance with ISO-3046/1, BS 5514, AS 2789, and DIN 6271.
Prime Power Ratings: Prime power ratings apply to installations where utility power is unavailable or unreliable. At varying load, the number of generator set operating hours is unlimited. A 10% overload
capacity is available for one hour in twelve. Ratings are in accordance with ISO-8528/1, overload power in accordance with ISO-3046/1, BS 5514, AS 2789, and DIN 6271. For limited running time and base
load ratings, consult the factory. Obtain the technical information bulletin (TIB-101) on ratings guidelines for the complete ratings definitions. The generator set manufacturer reserves the right to change the
design or specifications without notice and without any obligation or liability whatsoever. GENERAL GUIDELINES FOR DERATION: Altitude: Derate 0.5% per 100 m (328 ft.) elevation above 1500 m (4921 ft.)
up to a maximum elevation of 3000 m (9842 ft.). Temperature: Derate 2.0% per 10_C (18_F) temperature above 25_C (77_F) up to 50_C (122_F).
Ratings Range
60 Hz 50 Hz
Standby: kW 95--130 84--104
kVA 95--163 84--130
Prime: kW 90--115 77--96
kVA 90--144 77--120
Model: 125RZG
G4-81 (125RZG) 3/02c
Generator Ratings
Natural Gas LP Gas
130_C Rise 105_C Rise 130_C Rise 105_C Rise
Standby Rating Prime Rating Standby Rating Prime Rating
Generator Voltage Ph Hz kW/kVA Amps kW/kVA Amps kW/kVA Amps kW/kVA Amps
120/208 3 60 125/156 434 115/144 399 105/131 364 96/120 333
127/220 3 60 125/156 410 115/144 377 105/131 344 96/120 315
120/240 3 60 125/156 376 115/144 346 105/131 316 96/120 289
120/240 1 60 95/95 396 90/90 375 95/95 396 86/86 358
139/240 3 60 125/156 376 115/144 346 105/131 316 96/120 289
220/380 3 60 120/150 228 110/138 209 105/131 199 96/120 182
277/480 3 60 125/156 188 115/144 173 105/131 158 96/120 144
4S11 347/600 3 60 125/156 150 115/144 138 105/131 126 96/120 1154S11 110/190 3 50 104/130 395 96/120 365 96/120 365 88/110 334
115/200 3 50 104/130 375 96/120 346 96/120 346 88/110 318
120/208 3 50 104/130 361 96/120 333 96/120 333 88/110 305
110/220 3 50 104/130 341 96/120 315 96/120 315 88/110 289
110/220 1 50 84/84 382 77/77 350 84/84 382 77/77 350
220/380 3 50 104/130 198 96/120 182 96/120 182 88/110 167
230/400 3 50 104/130 188 96/120 173 96/120 173 88/110 159
240/416 3 50 104/130 180 96/120 167 96/120 167 88/110 153
120/208 3 60 130/163 451 115/144 399 110/138 382 100/125 347
127/220 3 60 130/163 426 115/144 377 110/138 361 100/125 328
120/240 3 60 130/163 391 115/144 346 110/138 331 100/125 301
120/240 1 60 100/100 417 91/91 379 100/100 417 91/91 379
139/240 3 60 130/163 391 115/144 346 110/138 331 100/125 301
220/380 3 60 125/156 237 115/144 218 110/138 209 100/125 190
277/480 3 60 130/163 195 115/144 173 110/138 165 100/125 150
4S13 347/600 3 60 130/163 156 115/144 138 110/138 132 100/125 1204S13 110/190 3 50 104/130 395 96/120 365 96/120 365 88/110 334
115/200 3 50 104/130 375 96/120 346 96/120 346 88/110 318
120/208 3 50 104/130 361 96/120 333 96/120 333 88/110 305
110/220 3 50 104/130 341 96/120 315 96/120 315 88/110 289
110/220 1 50 90/90 409 80/80 364 90/90 409 80/80 364
220/380 3 50 104/130 198 96/120 182 96/120 182 88/110 167
230/400 3 50 104/130 188 96/120 173 96/120 173 88/110 159
240/416 3 50 104/130 180 96/120 167 96/120 167 88/110 153
4V11 120/240 1 60 110/110 458 105/105 438 100/100 417 91/91 3794V11 110/220 1 50 96/96 436 87/87 395 88/88 400 80/80 364
2. D NEMA MG1, IEEE, and ANSI standards compliance for
temperature rise and motor starting.
D Sustained short-circuit current of up to 300% of the
rated current for up to 10 seconds.
D Sustained short-circuit current enabling downstream
circuit breakers to trip without collapsing the generator
field.
D Self-ventilated and dripproof construction.
D Vacuum-impregnated windings with fungus-resistant
epoxy varnish for dependability and long life.
D Superior voltage waveform from a two-thirds pitch
stator and skewed rotor.
D Solid-state, volts-per-hertz voltage regulator with ±2%
no-load to full-load regulation.
D Fast-Responset brushless alternator with brushless
exciter for excellent load response.
G4-81 (125RZG) 3/02c
Alternator Specifications
Specifications Generator
Manufacturer Kohler
Type 4-Pole, Rotating-Field
Exciter type Brushless, Permanent-
Magnet
Leads: quantity, type
4S11, 4S13 . . . . . . . . . . . . . . . . . . . . . . 12, Reconnectable
4V11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4, 110--120/220--240
Voltage regulator Solid State, Volts/Hz
Insulation: NEMA MG1
Material . . . . . . . . . . . . . . . . . . . . . . . . . . Class H
Temperature rise . . . . . . . . . . . . . . . . . . 130_C, Standby
Bearing: quantity, type 1, Sealed
Coupling Flexible Disc
Amortisseur windings Full
Voltage regulation, no-load to full-load 3-phase, ±2%
Unbalanced load capability 100% of Rated Standby
Current
One-step load acceptance 100% of Rating
Peak motor starting kVA: (35% dip for voltages below)
480 V, 380 V 4S11 (12 lead) . . . . . . . 460 (60Hz), 350 (50Hz)
480 V, 380 V 4S13 (12 lead) . . . . . . 510 (60Hz), 370 (50Hz)
240 V, 220 V 4V11 (4 lead) . . . . . . . . — (60Hz), — (50Hz)
Application Data
Engine
Engine Specifications 60 Hz 50 Hz
Manufacturer General Motors
Engine: model, type Industrial Powertrain,
Vortec 8.1 L, 4-Cycle,
Turbocharged
Cylinder arrangement V-8
Displacement, L (cu. in.) 8.1 (496)
Bore and stroke, mm (in.) 108 x 111 (4.25 x 4.37)
Compression ratio 9.1:1
Piston speed, m/min. (ft./min.) 399 (1311) 332 (1092)
Main bearings: quantity, type Alum. Lead Silicon Alloy
Rated rpm 1800 1500
Max. power at rated rpm, kW (HP) 146 (195) 118 (158)
Cylinder head material Cast Iron
Piston type and material Strutless Flat Top,
Hypereutectic Cast Alum.
Crankshaft material Cast Nodular Undercut
Rolled Fillet
Valve (exhaust) material Int.-A193 Exh. Inconel
Governor type Electronic
Frequency regulation, no-load to full-load Isochronous
Frequency regulation, steady state ±0.5%
Frequency Field-Convertible
Air cleaner type, all models Dry
Exhaust
Exhaust System 60 Hz 50 Hz
Exhaust flow at rated kW, m3/min. (cfm) 26.1 (920) 18.7 (660)
Exhaust temperature at rated kW, dry
exhaust, _C (_F) 649 (1200)
Maximum allowable back pressure,
kPa (in. Hg) 10.2 (3.0)
Exhaust outlet size at engine hookup,
mm (in.) 71 (2.8)
Engine Electrical
Engine Electrical System 60 Hz 50 Hz
Ignition system Individual Coil
Near Plug Ignition
Battery charging alternator:
Ground (negative/positive) . . . . . . . Negative
Volts (DC) . . . . . . . . . . . . . . . . . . . . . 12
Ampere rating . . . . . . . . . . . . . . . . . 70
Starter motor rated voltage (DC) 12
Battery, recommended cold cranking
amps (CCA):
Qty., rating for --18_C (0°F) . . . . . . 1, 630
Battery voltage (DC) 12
Fuel
Fuel System 60 Hz 50 Hz
Fuel type LP Gas or
Natural Gas
Fuel supply line inlet 1.5 NPTF
Natural gas/LPG fuel supply pressure,
kPa (in. H2O) 1.74--2.74 (7.0--11.0)
Lubrication
Lubricating System 60 Hz 50 Hz
Type Full Pressure
Oil pan capacity, L (qt.) 8.0 (8.5)
Oil pan capacity with filter, L (qt.) 8.5 (9.0)
Oil filter: quantity, type 1, Cartridge
3. G4-81 (125RZG) 3/02c
Application Data
Cooling (Standard Radiator)
Cooling System 60 Hz 50 Hz
Ambient temperature, _C (_F)* 50 (122)
Engine jacket water capacity, L (gal.) 10.0 (2.6)
Radiator system capacity, including
engine, L (gal.) 24.2 (6.4)
Engine jacket water flow, Lpm (gpm) 125 (33) 102 (27)
Heat rejected to cooling water at rated
kW, dry exhaust, kW (Btu/min.) 110 (6260) 72 (4100)
Heat rejected to engine oil at rated kW,
kW (Btu/min.) 1.4 (81) 1.2 (68)
Water pump type Centrifugal
Fan diameter, including blades, mm (in.) 599 (23.6)
Fan, kWm (HP) 10.4 (14.0) 6.0 (8.1)
Max. restriction of cooling air, intake and
discharge side of radiator, kPa (in. H2O) 0.125 (0.5)
* Weather housing with roof-mounted silencer and enclosure with
enclosed silencer reduce ambient temperature capability by 10_C
(18_F).
Remote Radiator System[ 60 Hz 50 Hz
Exhaust manifold type Dry
Connection sizes:
Water inlet, ID hose, mm (in.) . . . . 44.45 (1.75)
Water outlet, ID hose, mm (in.) . . . 38.10 (1.50)
Static head allowable
above engine, kPa (ft. H2O) 4.32 (17.0)
[ Contact your local distributor for cooling system options and
specifications based on your specific requirements.
City Water Cooling (CWC) System 60 Hz 50 Hz
Exhaust manifold type Dry
System capacity, L (gal.) —
City water consumption at 10°C (50°F),
Lpm (gpm) —
Connection sizes:
Water inlet, mm (in.) . . . . . . . . . . . . —
Water outlet, mm (in.) . . . . . . . . . . . —
Operation Requirements
Air Requirements 60 Hz 50 Hz
Radiator-cooled cooling air,
m3/min. (scfm)] 306 (10800) 232 (8200)
Cooling air required for generator set
when equipped with CWC or remote
radiator, based on 14_C (25_F) rise and
ambient temperature of 29_C (85_F),
m3/min. (cfm) 307 (10840) 193 (6820)
Combustion air, m3/min. (cfm) 8.8 (312) 6.2 (220)
Heat rejected to ambient air:
Engine, kW (Btu/min.) . . . . . . . . . . 72.0 (4100) 44.1 (2510)
Generator, kW (Btu/min.) . . . . . . . . 13.7 (780) 9.8 (560)
] Air density = 1.20 kg/m3 (0.075 lbm/ft3)
Fuel Consumptionw 60 Hz 50 Hz
Natural Gas, m3/hr. (cfh) at % load Standby Rating
100% 46.8(1651) 39.6(1400)
75% 38.9(1372) 31.3(1105)
50% 27.9 (984) 22.8 (806)
25% 18.4 (650) 15.1 (535)
0% 10.4 (369) 8.8 (310)
Natural Gas, m3/hr. (cfh) at % load Prime Rating
100% 43.9(1549) 36.6(1293)
75% 35.8(1266) 29.0(1023)
50% 26.1 (923) 21.4 (757)
25% 17.7 (624) 14.6 (515)
0% 10.4 (369) 8.8 (310)
LP Gas, m3/hr. (cfh) at % load Standby Rating
100% 16.5 (582) 14.4 (509)
75% 13.3 (469) 11.8 (416)
50% 10.0 (354) 8.4 (298)
25% 6.4 (226) 5.8 (205)
0% 3.7 (130) 3.1 (108)
LP Gas, m3/hr. (cfh) at % load Prime Rating
100% 15.3 (541) 13.5 (475)
75% 12.4 (438) 10.9 (384)
50% 9.4 (331) 8.0 (281)
25% 6.1 (217) 5.6 (196)
0% 3.7 (130) 3.1 (108)
w Fuel consumption is based on 1015 Btu/standard cu. ft. natural gas.
Controllers
Available Controllers
Decision-Makert 550 Controller
Audiovisual annunciation with NFPA 110 Level 1 capability.
Programmable microprocessor logic and digital display features.
Generator safeguard circuit protection.
12- or 24-volt engine electrical system capability.
Remote start, remote annunciation, and remote communication options.
Refer to G6-46 for additional controller features and accessories.
Decision-Makert 3+, 16-Light Controller
Audiovisual annunciation with NFPA 110 Level 1 capability.
Microprocessor logic, AC meters, and engine gauge features.
12- or 24-volt engine electrical system capability.
Remote start, prime power, and remote annunciation options.
Refer to G6-30 for additional controller features and accessories.
4. ã 2001, 2002 by Kohler Co. All rights reserved.
DISTRIBUTED BY:
Dimensions and Weights
NOTE: This drawing is provided for reference only and should not be used for planning
installation. Contact your local distributor for more detailed information.
Overall Size, L x W x H, mm (in.):
Wide Skid 2400 x 1040 x 1484 (94.5 x 40.9 x 58.4)
Narrow Skid 2400 x 865 x 1484 (94.5 x 34.1 x 58.4)
Weight (radiator model), wet, kg (lb.): 1134 (2500)
H
W L
G4-81 (125RZG) 3/02c
Standard Features and Accessories
Additional Standard Features
D Alternator Protection (standard with Decision-Makert550)
D Battery Rack and Cables
D Electronic, Isochronous Governor
D Integral Vibration Isolation
D Low Fuel Pressure Shutdown
D Oil Drain Extension
D Operation and Installation Literature
D Pilot-Excited, Permanent-Magnet Generator (PMG)
Accessories
Enclosed Unit
- Weather Housing (includes critical silencer, mounting, tailpipe,
and skid end caps)
- Sound Enclosure
Open Unit
- Exhaust Silencer, Critical (kits: PA-324292, PA-324470)
- Flexible Exhaust Connector, Stainless Steel
Cooling System
- Block Heater
- City Water Cooling
- Radiator Duct Flange
- Remote Radiator Cooling
Fuel System
- Flexible Fuel Lines
- Gas Strainer
- LP Gas Liquid Withdrawal
- Manual Valve
- Secondary Gas Solenoid Valve
Electrical System
- Battery
- Battery Charger, Equalize/Float Type
- Battery Heater
Engine and Generator
- Air Cleaner Restrictor Indicator
- Bus Bar Kits
- CSA Certification
- Generator Strip Heater
- Line Circuit Breaker (NEMA1 enclosure)
- Line Circuit Breaker with Shunt Trip (NEMA1 enclosure)
- Optional Generators
- Rated Power Factor Testing
- Rodent Guards
- Safeguard Breaker (not available with Decision-Makert550)
- Voltage Regulation, 1%
- Voltage Regulator Sensing, Three-Phase
Literature and Maintenance
- General Maintenance Literature Kit
- Maintenance Kit (includes standard air, oil, and fuel filters)
- NFPA 110 Literature
- Overhaul Literature Kit
- Production Literature Kit
Controller
- Common Failure Relay Kit
- Communication Products and PC Software
(Decision-Makert550 controller only)
- Customer Connection Kit
- Dry Contact Kit (isolated alarm)
- Engine Prealarm Sender Kit
- Local Emergency Stop Kit
- Prime Power Switch (Decision-Makert550 controller only)
- Remote Annunciator Panel
- Remote Audiovisual Alarm Panel
- Remote Emergency Stop Kit
- Remote Mounting Cables
- Run Relay Kit
Miscellaneous Accessories
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KOHLER CO., Kohler, Wisconsin 53044 USA
Phone 920-565-3381, Fax 920-459-1646
For the nearest sales and service outlet in the
US and Canada, phone 1-800-544-2444
KohlerPowerSystems.com
Kohler Power Systems
Asia Pacific Headquarters
7 Jurong Pier Road
Singapore 619159
Phone (65)264-6422, Fax (65)264-6455