1. Introduction and Overview
Thank you for choosing the VITO VIGD20ST 20kVA Diesel Generator. This manual provides important information for the safe and efficient operation, installation, and maintenance of your generator. Please read this manual thoroughly before operating the generator and keep it for future reference.
The VITO VIGD20ST is a robust 20kVA (16 kW continuous power) diesel generator designed for reliable power supply. It features a 4-cylinder water-cooled diesel engine, an ATS (Automatic Transfer Switch) connection for automatic startup during power outages, and AVR (Automatic Voltage Regulation) technology to protect sensitive electronic equipment. Its sound-insulated casing ensures reduced noise levels, making it suitable for various applications.

Image 1.1: Two VITO VIGD20ST diesel generators. This image illustrates the compact and robust design of the generator, highlighting its industrial-grade construction and sound-insulated casing.
2. Safety Instructions
WARNING: Failure to follow these safety instructions can result in serious injury, death, or property damage.
- Carbon Monoxide Hazard: Generators produce carbon monoxide, a colorless, odorless, poisonous gas. Operate the generator outdoors in a well-ventilated area, far away from windows, doors, and vents. Never operate indoors or in enclosed spaces.
- Electrical Shock Hazard: Never operate the generator in wet conditions. Ensure all electrical connections are secure and properly grounded. Do not touch live electrical parts.
- Fire Hazard: Diesel fuel is flammable. Store fuel in approved containers away from heat sources. Do not refuel while the engine is running or hot. Ensure adequate ventilation around the generator to prevent overheating.
- Hot Surfaces: The generator engine and exhaust system become very hot during operation and remain hot for some time after shutdown. Avoid contact with hot surfaces to prevent burns.
- Moving Parts: Keep hands, feet, and clothing away from moving parts such as the fan and belts.
- Hearing Protection: Wear appropriate hearing protection when operating the generator, especially during prolonged use.
- Grounding: Always ensure the generator is properly grounded according to local electrical codes.
3. Setup and Installation
3.1 Unpacking and Placement
- Carefully remove the generator from its packaging. Inspect for any shipping damage.
- Place the generator on a firm, level surface. The chassis is designed for towing or lifting with a crane or forklift for easier positioning.
- Ensure adequate clearance around the generator for ventilation and maintenance access. Maintain at least 1 meter (3 feet) of clear space on all sides.
3.2 Fuel and Oil
- Fill the fuel tank with clean diesel fuel. The tank capacity is 50 liters, providing up to 17 hours of runtime. Do not overfill.
- Check the engine oil level and fill with the recommended engine oil type (refer to the engine manual for specifics) to the appropriate mark on the dipstick.
3.3 Electrical Connections
The generator features both single-phase (230V AC 50Hz) and three-phase (400V AC 50Hz) outlets.

Image 3.1: Generator control panel and power outlets. This image shows the main control panel with the key switch and the various power outlets, including both single-phase and three-phase connections.

Image 3.2: Generator power outlets with warning label. This image provides a closer look at the robust power outlets and the electrical hazard warning label, emphasizing safety precautions.
- Connect your appliances or electrical system to the appropriate outlets. Ensure the total load does not exceed the generator's rated capacity (16 kW continuous).
- For optimal performance and longevity, distribute the load symmetrically across the phases if using three-phase power.
- ATS Connection: The generator is equipped with an ATS connection for automatic start upon power failure. Connect a compatible ATS housing (not included) according to its specific instructions and local electrical codes.
4. Operating Instructions
4.1 Pre-Start Checklist
- Check fuel level.
- Check engine oil level.
- Ensure all electrical connections are secure.
- Verify the generator is properly grounded.
- Ensure no obstructions are near the air intake or exhaust.
4.2 Starting the Generator (Electric Start)
- Turn the main circuit breaker to the 'OFF' position.
- Insert the key into the ignition switch and turn it to the 'START' position. Hold until the engine starts. Do not crank for more than 5 seconds at a time. If the engine does not start, wait 10 seconds before trying again.
- Once the engine starts, release the key, and it will return to the 'RUN' position.
- Allow the engine to warm up for a few minutes before applying a load.
- Turn the main circuit breaker to the 'ON' position to supply power to your connected devices.
4.3 Automatic Voltage Regulation (AVR)
The VITO VIGD20ST is equipped with AVR technology, which automatically regulates voltage fluctuations. This ensures a stable and correct voltage output, protecting your sensitive electronic devices from damage due to voltage spikes or drops.
4.4 Stopping the Generator
- Turn off all connected appliances and disconnect them from the generator.
- Turn the main circuit breaker to the 'OFF' position.
- Allow the generator to run for a few minutes without load to cool down.
- Turn the ignition key to the 'OFF' position to shut down the engine.
5. Maintenance
Regular maintenance is crucial for the longevity and reliable operation of your generator. Always perform maintenance with the engine off and cooled down, and disconnect the battery if performing electrical work.
5.1 Daily/Before Each Use
- Check engine oil level.
- Check fuel level.
- Inspect for any visible leaks (fuel, oil, coolant).
- Check air filter for excessive dirt.
5.2 Every 50 Hours or Monthly
- Change engine oil.
- Clean or replace air filter.
- Check battery terminals and electrolyte level (if applicable).
5.3 Every 200 Hours or Annually
- Replace fuel filter.
- Replace oil filter.
- Inspect and adjust valve clearance (professional service recommended).
- Check and clean cooling system.
- Inspect all hoses and clamps.
6. Troubleshooting
This section provides solutions to common operational issues. For problems not listed here or if issues persist, contact qualified service personnel.
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine does not start | No fuel Low oil level Dead battery Faulty ignition switch | Add diesel fuel Add engine oil Charge or replace battery Contact service |
| No power output | Circuit breaker tripped Overload AVR malfunction | Reset circuit breaker Reduce load Contact service |
| Engine runs rough | Dirty fuel filter Clogged air filter Incorrect fuel type | Replace fuel filter Clean/replace air filter Use correct diesel fuel |
| Excessive noise | Loose components Exhaust leak Engine issue | Inspect and tighten Check exhaust system Contact service |
7. Specifications
| Feature | Specification |
|---|---|
| Model | VIGD20ST |
| Brand | VITO (Central Lobao) |
| Nominal Power (PRP) | 20 kVA / 16 kW |
| Backup Power (STP) | 22 kVA / 17.6 kW |
| Output Voltage | 230 V AC 50 Hz (Single-phase) / 400 V AC 50 Hz (Three-phase) |
| Nominal Output Current | 30.3 A |
| Fuel Type | Diesel |
| Cylinder Capacity | 2.54 Liters |
| Fuel Tank Capacity | 50 Liters |
| Runtime (50% load) | Up to 17 hours |
| Cooling System | Water-cooled |
| Noise Level (Lwa at 1m) | 80 dB(A) |
| Dimensions (L x W x H) | 184 x 85 x 110 cm |
| Weight | 760 kg |
| Start System | Electric Start |
| Voltage Regulation | AVR (Automatic Voltage Regulation) |
| Special Features | ATS Connection, Sound-insulated casing |
8. Warranty and Support
For warranty information, technical support, or spare parts, please contact your authorized VITO dealer or the manufacturer, Central Lobao. Keep your purchase receipt and the generator's serial number readily available when contacting support.
Please refer to the specific warranty terms and conditions provided at the time of purchase, as these may vary by region and retailer.