KOHLER 48RCLC Multi Fuel LPG Natural Gas Owner’s Manual

: July 22, 2024
: Kohler

Table of Contents

KOHLER 48RCLC Multi Fuel LPG Natural Gas
Specifications
Product Usage Instructions
FAQ
The Kohler Advantage
Standard Features
Generator Set Ratings
Alternator Specifications
Application Data
Dimensions and Weights
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

KOHLER 48RCLC Multi Fuel LPG Natural Gas

Specifications

Model: 48RCLC
Fuel Type : Multi-Fuel LPG/Natural Gas
Engine: Kohler 6.2L liquid-cooled engine
Controller: Digital controller for generator set and transfer switch functions
Features: Electronic speed control, digital voltage regulation, electronic engine management system, dual fuel capability, electronically controlled fan speeds
Warranty: Kohler’s premium limited warranty covering parts, labor, and travel
Certifications: EPA certified, cUL/UL listing, CSA certification, NFPA 37 compliant

Product Usage Instructions

Controller Operation
The digital controller manages both the generator set and transfer switch functions. Ensure the controller is properly set up and configured based on your power needs.

Fuel Conversion
If needed, perform a field conversion between natural gas and LP vapor fuels. Follow the manufacturer’s instructions carefully to maintain emission certification.

Maintenance
Regular maintenance of the engine and electronic components is essential for optimal performance. Refer to the user manual for maintenance schedules and procedures.

Emergency Operation
In case of a power outage, connect the generator to your home’s electrical system using the appropriate transfer switch. Ensure proper ventilation and fuel supply during extended use.

FAQ

Can I switch between natural gas and LP vapor fuels easily?
Yes, the generator allows for simple field conversion between natural gas and LP vapor fuels while maintaining emission certification. An optional dual fuel automatic changeover kit is available for convenience.
How quiet is the generator during operation?
The electronically controlled fan speeds minimize the generator set sound signature, providing quiet, neighborhood-friendly performance.
What certifications does the generator have?
The generator is EPA certified, cUL/UL listed, CSA certified, and meets NFPA 37 requirements for installation offset.

The Kohler Advantage

High Quality Power
Kohler home generators provide advanced voltage and frequency regulation along with ultra-low levels of harmonic distortion for excellent generator power quality to protect your valuable electronics.
Fast Response
Kohler’s Fast-Response® X excitation system delivers excellent voltage response and short-circuit capability using a rare-earth permanent magnet (PM)-excited alternator.
Quiet Operation
Kohler home generators provide quiet, neighborhood-friendly performance.
Premium 5-year/2000 hr Limited Warranty Included
Kohler is known for extraordinary reliability and performance. Kohler’s premium limited warranty covers parts, labor, and travel for the full warranty period.
Aluminum Enclosure
Attractive aluminum enclosure allows installation as close as 18 inches from your home or small business. Optional 291 kph (181 mph) wind-load-rated enclosure door kit is available for field installation.

Standard Features

The generator set and its components are prototype-tested, factory-built, and production-tested.
The generator set accepts rated load in one step.
A premium 5-year/2000-hour limited warranty covers all systems and components.
Quick-ship (QS) models with selected features are available. See your Kohler dealer for details.
GFCI service outlet installed on the junction box.
RDC2 Controller
- One digital controller manages both the generator set and transfer switch functions (with optional Model RXT ATS).
- Designed for today’s most sophisticated electronics.
- Electronic speed control responds quickly to changing demand.
- Digital voltage regulation protects your valuable electronics from harmonic distortion and unstable power quality.
- OnCue® Plus Generator Management System for remote monitoring is included with the generator.
Engine Features
- Powerful and reliable Kohler 6.2L liquid-cooled engine
- Electronic engine management system.
- Simple field conversion between natural gas and LP vapor fuels while maintaining emission certification. (Optional dual fuel automatic changeover kit is available.)
Innovative Cooling System
Electronically controlled fan speeds minimize generator set sound signature.
Approved for stationary standby applications in locations served by a reliable utility source.
Certifications
- The 60 Hz generator set engine is certified by the Environmental Protection Agency (EPA) to conform to the New Source Performance Standard (NSPS) for stationary spark-ignited emissions.
- cUL/UL listing, CSA certification standard are available.
- Accepted by the Massachusetts Board of Registration of Plumbers and Gas Fitters.
- Meets NFPA 37 requirements for 18 in. offset for installation.

Generator Set Ratings

Standby Ratings| Standby Ratings| |
---|---|---|---
| | | | Natural Gas| LPG| | Line Circuit Breaker
Alternator| Voltage| Ph| Hz| kW/kVA| Amps| kW/kVA| Amps| Amps| Poles
| 120/240| 1| 60| 44/44| 184| 44/44| 184| —| —
| 120/208| 3| 60| 48/60| 167| 50/62| 174| 175| 3
4P7BX| 127/220| 3| 60| 48/60| 158| 50/62| 165| —| —
| 120/240| 3| 60| 48/60| 145| 50/62| 151| 150| 3
| 277/480| 3| 60| 48/60| 73| 50/62| 76| 80| 3
4Q7BX| 120/240| 1| 60| 48/48| 200| 48/48| 200| 200| 2

Voltage configuration not available from the factory. Field-adjustable by an authorized service technician.|
† 50 Hz options are available. Contact your Customer Service representative.|

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-8528-1 and ISO-3046-1. Obtain technical information bulletin TIB-101 for ratings guidelines, complete ratings definitions, and site condition derates. The generator set manufacturer reserves the right to change the design or specifications without notice and without any obligation or liability whatsoever. Availability is subject to change without notice. Contact your local Kohler generator dealer for availability.

Alternator Specifications

Specifications		Alternator
Manufacturer		Kohler
Type		4-Pole, Rotating Field
Exciter type		Brushless, Rare-Earth Permanent Magnet

The unique Fast-Response® X excitation system delivers excellent voltage response and short-circuit capability using a rare-earth, permanent magnet (PM)-excited alternator.
Brushless, rotating-field alternator.
NEMA MG1, IEEE, and ANSI standards compliance for temperature rise and motor starting.
Sustained short-circuit current of up to 300% of the rated current for up to 10 seconds.
Sustained short-circuit current enabling downstream circuit breakers to trip without collapsing the alternator field.
Self-ventilated and dripproof construction.
Windings are vacuum-impregnated with epoxy varnish for dependability and long life.
Superior voltage waveform from a two-thirds pitch stator and skewed rotor.
Total harmonic distortion (THD) from no load to full load with a linear load is less than 4%.

Application Data

Engine

Engine Specifications 60 Hz
- Manufacturer Kohler
- Engine: model, type KG6208 6.2L Natural Aspiration
- Cylinder arrangement V-8
- Rated rpm 1800
- Displacement, L (cu. in.) 6.2 (378)
- Bore and stroke, mm (in.) 101.6 x 95.25 (4.00 x 3.75)
- Compression ratio 10.5:1
- Max. power at rated rpm, kW (HP) 77.0 (103)
- Cylinder head material Cast Aluminum
- Piston type and material High Silicon Aluminum
- Crankshaft material Cast Iron
- Valve (exhaust) material Forged Steel
- Governor type Electronic
- Frequency regulation, no-load to full-load Isochronous
- Frequency regulation, steady state ±1.0%
- Frequency Fixed
- Air cleaner type Dry

Engine Electrical

Engine Electrical System
- Ignition system Electronic
- Battery charging alternator:
- Ground (negative/positive) Negative
- Volts (DC) 12
- Ampere rating 130
- Starter motor rated voltage (DC) 12
- Battery, recommended cold cranking amps (CCA):
- Qty., rating for -18°C (0°F) One, 630
- Battery voltage (DC) 12
- Battery group size 24

Exhaust

Exhaust System 60 Hz
- Exhaust manifold type Dry
- Exhaust flow at rated kW, m3/min. (cfm) 16.4 (580)
- 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.) 76 (3.0) OD

Fuel

Fuel System
- Fuel type LP Gas or Natural Gas
- Fuel supply line inlet 1 in. NPT
- Natural gas fuel supply pressure, kPa (in. H2O) 1.2-2.7 (5-11)
- LPG vapor withdrawal fuel supply pressure, kPa (in. H2O) 1.2-2.7 (5-11)
Fuel Composition Limits****

Lubrication

Lubricating System
- Type Full Pressure
- Oil pan capacity, L (qt.) 5.7 (6.0)
- Oil pan capacity with filter, L (qt.) 7.1 (7.5)
- Oil filter: quantity, type 1, Cartridge

Cooling

Radiator System 60 Hz
- Ambient temperature, °C (°F) 45 (113)
- Radiator system capacity, including engine, L (gal.) 21.3 (5.6)
- Engine jacket water flow, Lpm (gpm) 131 (34.6)
- Heat rejected to cooling water at rated kW, dry exhaust, kW (Btu/min.) 48 (2730)
- Water pump type Centrifugal
- Fan diameter, mm (in.) qty. 3 @ 356 (14)
- Fan power requirements (powered by engine battery charging alternator) 12VDC, 18 amps each

**Operation Requirements***

Air Requirements 60 Hz
- Radiator-cooled cooling air, m3/min. (scfm)† 62.2 (2200)
- Air over engine, m3/min. (cfm) 31.1 (1100)
- Combustion air, m3/min. (cfm) 5.5 (195)
  Air density = 1.20 kg/m3 (0.075 lbm/ft3)
Fuel Consumption‡
- Natural Gas, m3/hr. (cfh) at % load 60 Hz
- 100% 24.8 (875)
- 75% 20.3 (717)
- 50% 14.5 (512)
- 25% 8.7 (307)
- LP Gas, at % load 60 Hz

Sound Enclosure Features

Sound-attenuating enclosure uses acoustic insulation that meets UL 94 HF1 flammability classification and repels moisture absorption.
Internally mounted critical silencer.
Skid-mounted, aluminum construction with two removable access panels.
Scratch- and corrosion-resistant Kohler® cashmere powder-baked finish.

Sound Data

Model 48RCLC sound levels are 61 dB(A) during engine exercise and 61 dB(A) during normal operation.*
All sound levels are measured at a distance of 23 ft. (7 m) from the generator set.
Lowest of 8 points measured around the generator. Sound levels at other points around generator may vary depending on installation parameters.

RDC2 Controller

The RDC2 controller provides integrated control for the generator set, Kohler® Model RXT transfer switch, programmable interface module (PIM), and load shed kit.
The RDC2 controller’s 2-line LCD screen displays status messages and system settings that are clear and easy to read, even in direct sunlight or low light.

RDC2 Controller Features

Membrane keypad:
- OFF, AUTO, and RUN pushbuttons
- Select and arrow buttons for access to system configuration and adjustment menus
LED indicators for OFF, AUTO, and RUN modes
LED indicators for utility power and generator set source availability and ATS position (Model RXT transfer switch required)
LCD screen:
- Two lines x 16 characters per line
- Backlit display with adjustable contrast for excellent visibility in all lighting conditions
Scrolling system status display
- Generator set status
- Voltage and frequency
- Engine temperature
- Oil pressure
- Battery voltage
- Engine runtime hours
Date and time displays
Smart engine cooldown senses engine temperature
Digital isochronous governor to maintain steady-state speed at all loads
Digital voltage regulation: ±1.0% RMS no-load to full-load
Automatic start with programmed cranking cycle
Programmable exerciser can be set to start automatically on any future day and time, and to run every week or every two weeks
Exercise modes
- Unloaded exercise with complete system diagnostics
- Unloaded full-speed exercise
- Loaded full-speed exercise (Model RXT ATS required)
Front-access mini USB connector for SiteTech™ connection
Integral Ethernet connector for Kohler® OnCue® Plus
Built-in 2.5 amp battery charger
Remote two-wire start/stop capability for optional connection of a Model RDT transfer switch

Additional RDC2 Controller Features

Diagnostic messages
- Displays diagnostic messages for the engine, generator, Model RXT transfer switch, programmable interface module (PIM), and load shed kit
- Over 70 diagnostic messages can be displayed
Maintenance reminders
System settings
- System voltage, frequency, and phase
- Voltage adjustment
- Measurement system, English or metric
ATS status (Model RXT ATS required)
- Source availability
- ATS position (normal/utility or emergency/generator)
- Source voltage and frequency
ATS control (Model RXT ATS required)
- Source voltage and frequency settings
- Engine start time delay
- Transfer time delays
- Fixed pickup and dropout settings
- Voltage calibration
Programmable Interface Module (PIM) status displays
- Input status (active/inactive)
- Output status (active/inactive)
Load control menus
- Load status
- Test function

Generator Set Standard Features

Aluminum sound enclosure with enclosed silencer
Battery rack and cables
Coolant in generator
cUL/UL 2200 listed, CSA certified
Electronic, isochronous governor
Engine-generator set is designed and manufactured in facilities certified to ISO:9001.
Flexible fuel line
Gas fuel system (includes fuel mixer, electronic secondary gas regulator, two gas solenoid valves, and flexible fuel line between the engine and the skid-mounted fuel system components)
GFCI service outlet (120/240 V) for customer connections
Integral vibration isolation
Line circuit breaker
NEC prime mover shutdown switch
Oil drain extension
OnCue® Plus for remote monitoring
Operation and installation literature
RDC2 controller with built-in battery charger
Standard 5-year/2000-hour premium warranty

Available Options

Electrical System
- Battery
- Battery Heater
- OnCue® Plus Wireless Radio Kit
Fuel System
Dual Fuel Automatic Changeover Kit with Reset Box
Enclosure Option
291 kph (181 mph) Wind Load Rated Enclosure
Starting Aids §
- Block Heater, 1500 W, 120 V*
- Block Heater, 1500 W, 240 V
  Single phase QS available with factory installed block heater
  Recommended for ambient temperatures below 0°C (32°F)
Controller Accessories
- Lockable Enclosure or Remote Mount Emergency Stop (lockout/tagout)
- Programmable Interface Module (PIM) (provides 2 digital inputs and 6 relay outputs)
Automatic Transfer Switches and Accessories
Model RXT Automatic Transfer Switch with Combined
Interface/Load Management Board
- Model RDT Automatic Transfer Switch
- Load Shed Kit for RDT or RXT
- Power Relay Modules (use up to 4 relay modules for each load management device)
- Other Kohler® ATS
Miscellaneous
Maintenance Kit (includes air filter, oil, oil filter, and spark plugs)
Literature
- General Maintenance Literature Kit
- Overhaul Literature Kit
- Production Literature Kit
Warranty
- Extended 7-Year/2000 Hour Premium Limited Warranty
- Extended 10-Year/2000 Hour Premium Limited Warranty

Dimensions and Weights

Overall Size, L x W x H, mm (in.): 2280 x 836 x 1182 (89.8 x 32.9 x 46.5)
Shipping Weight, wet, kg (lb.): 767 (1690)
Weight includes generator set with engine fluids and 4Q7BX alternator, sound enclosure, and silencer.
NOTE: This drawing is provided for reference only and should not be used for planning installation. Contact your local dealer for more detailed information.