Draper 50, 100 & 120 Litre Air Compressor

Quick Guide from the Manual

This manual covers the operation and maintenance of Draper 50, 100, and 120 Litre air compressors. Before using the equipment, ensure the oil level is correct, the drain valve is closed, and the unit is placed in a well-ventilated area with at least 1 metre of clearance. Always disconnect from the power supply before performing any maintenance.

Installation

After unpacking, perform the following steps:

• Replace the plastic shipping cap on the motor housing with the provided oil dipstick.
• Check the oil level using the dipstick; ensure it is between the minimum and maximum notches.
• Ensure the compressor is placed in a well-ventilated area with at least 1 metre of safety clearance around the unit.

Operation

The compressor is controlled by a pressure switch assembly that automatically cuts off power when the maximum pressure is reached and restarts when pressure drops below the minimum. To operate:

• Connect the compressor to the power supply.
• Ensure the reservoir drain valve is closed.
• Turn the switch on the pressure switch box to the ON position.
• To stop, turn the switch to the OFF position. Do not switch off at the power supply before turning off the machine.

Maintenance

Regular maintenance is essential for longevity:

• Every Day: Check oil level and top up if required. Drain condensate from the receiver using the drain plug on the underside of the tank.
• Every Month: Clean the air suction filter using compressed air. Check drive belt tension and adjust if necessary.
• Every 500 Hours: Replace the oil. Clean external surfaces of the pump and motor, ensuring fan cowlings and cooling fins are not obstructed.
• Every 2000 Hours: Check the condition of valves and replace if damaged or worn.

Pressure Switch Adjustments

If the delivery pressure drifts, the pressure switch may require adjustment. Remove the switch cover and turn the pressure regulating screw clockwise to increase the cut-out level or anticlockwise to decrease it. Warning: Do not adjust the cut-out level above the maximum pressure specified for the machine.

Troubleshooting

If the compressor fails to start, check the power cable, fuse, circuit breaker, or thermal overload protection. If the unit runs but produces no air, check that all valves are closed and inspect gaskets and drive belts. For further assistance, contact the Power Division Help Line at 01703 494344.