This document provides comprehensive operating instructions for the Hilti DD VP-U vacuum pump, a specialized appliance designed for professional use. It is crucial to read these instructions thoroughly before operating the device for the first time and to keep them with the appliance for future reference, especially when transferring it to other users.
The DD VP-U vacuum pump is primarily intended for use in conjunction with vacuum fastening devices, such as those employed with Hilti diamond coring machines, supporting coring diameters up to a maximum of 250 mm. Its core function is to act as an air suction pump, and it is strictly not to be used for other gases or liquids. A key feature is its integrated water separator, which makes it suitable for applications where water is present, such as diamond core drilling. However, it is explicitly stated that the appliance must not be operated in locations with a risk of explosion, like near gas tanks. This appliance is designed for use by trained and authorized personnel who are aware of potential hazards. Untrained individuals, children, or persons with physical, sensory, or mental disabilities, or those lacking appropriate experience and knowledge, should not use this appliance. To ensure safety and prevent injury, only genuine Hilti tools and accessories should be used with the DD VP-U.
Usage Features:
The DD VP-U vacuum pump is designed for straightforward operation, with several features to ensure efficient and safe use. Before operation, the pump must be set up on a dry, horizontal surface and secured to prevent movement. It is essential to ensure an unobstructed flow of cooling air to the pump, maintaining at least 20 cm of free space around the cooling air intake and exit to prevent overheating. The supply cord and hose should be protected from pinching or kinking.
To begin operation, the supply cord is plugged into a power outlet, and the pump is switched on using the on/off switch. A built-in pressure gauge monitors the vacuum, and after a short time, the pressure indicator should be in the green area, signifying adequate vacuum pressure. If the indicator is in the red area, the vacuum pressure is inadequate, and immediate action is required to check for leaks or kinks in the hose. The appliance is equipped with a safety valve to prevent water from being drawn into the pump when the water container is full. If this valve activates, the vacuum pressure will drop, indicating that the water separator needs to be emptied.
Regular checks are crucial during operation. The pressure gauge should be monitored at regular intervals to ensure continuous adequate vacuum. The water level in the water separator also needs to be checked periodically. If the vacuum pressure drops or the safety valve activates, work should be stopped immediately, and the water separator emptied. To switch off the pump, the on/off switch is used, and then the supply cord is disconnected from the power outlet.
Maintenance Features:
Proper care and maintenance are vital for the longevity and safe operation of the DD VP-U vacuum pump. Before any maintenance, the supply cord plug must be disconnected from the power outlet to prevent electrical hazards. Improper cleaning can also affect electrical safety.
A key maintenance task is emptying the water separator. This involves connecting the hose to the vacuum base plate to release any remaining vacuum pressure. The water separator container is then rotated to the "open" position and pulled down and away from the pump via its bayonet connection. After emptying, the ball float inside the separator should be checked to ensure it moves freely within its cage. If it is stuck, it should be pressed down. The top edge of the water separator container should be cleaned before refitting. To reassemble, the bayonet connector on the container is engaged, and the container is rotated towards "close," ensuring it is securely seated.
For general cleaning of the appliance, a damp cloth and a mild household cleaner can be used on the exterior. Solvents should not be used as they can damage plastic components. It is important not to clean the appliance with running water or pressure jet/spray systems, as this can adversely affect electrical safety. The grip surfaces should always be kept free from oil and grease. The ventilation slots must be regularly cleaned with a soft, dry brush to prevent overheating.
Troubleshooting guidance is provided for common issues. For instance, if the pump runs but no vacuum is created, potential causes include a clogged filter, dirt in hoses or fittings, operation at high altitude, or a full water separator. Solutions range from cleaning components and emptying the separator to returning the appliance for repair if the pump itself is defective or damaged. If the pump switches itself off, it could be due to an activated overheating cut-out, requiring the appliance to cool down and ventilation slots to be checked. If the water separator container cannot be removed, it indicates that the system is still under vacuum, which can be resolved by releasing the pressure by connecting the hose to the vacuum baseplate.
The manual also emphasizes the importance of using only genuine Hilti spare parts for repairs and having the appliance serviced by a qualified repair person using identical replacement parts to maintain safety. Regular checks of the supply cord and extension cords for damage are also recommended, with damaged cords to be replaced by a qualified specialist or Hilti Customer Service.