RNC Knowledge
Knowledge
Reference material on the engineering behind the products RNC builds, and on the rules and standards that shape them. Written for the people who specify, install and develop sanitary and safety products, whether they are choosing a control or designing one.
Water Hygiene and Flushing Control
Stagnation, flushing regimes, temperature control and the electronics that run them. What the requirements are in each market, what they mean at the outlet, and what a control has to do to satisfy them.
Foundations
- Automatic flushing and water hygiene control Start here What automatic flushing controls at the outlet, how it works alongside temperature and disinfectant control rather than replacing them, and how a regime is designed.
- Hygiene flush settings: interval and duration The four settings that describe most regimes: how often the flush runs, how long it runs, whether user activity resets the timer, and when the schedule starts.
Requirements
- Safety showers and eyewash Plumbed emergency showers and eyewash stations are activated periodically, and automation can take over the water side of that job at fixtures nobody visits often.
- Accessibility requirements for controls Accessibility rules govern how a tap, shower or flush control is operated rather than what it looks like, starting with the force it takes to work it.
- Water hygiene requirements in Germany German drinking water rules place duties on the operator of a building's water system, enforced through the Trinkwasserverordnung with technical practice in VDI/DVGW 6023 and the DVGW W 551 series.
Applications
- Low-use and intermittent outlets Low-use outlets are where water age accumulates, and finding them means establishing which pipework actually serves each one.
- Battery-powered flushing Many outlets that need flushing have no mains supply, so whether a control lasts a service life on a battery is a power budget question.
- Temperature and scald protection Hygiene control keeps hot water hot and cold water cold, scald protection limits what the outlet delivers, and the two have to be designed together.
Systems and decisions
- Inside electronic water management systems What these systems control and record at the outlet, and why much of what separates one product from another is firmware rather than hardware.
- Connecting to building management systems Connecting outlet-level flushing to a building system turns a regime that runs quietly into one that can be supervised and adjusted centrally.
- Developing electronics in-house or sourcing Cost is one criterion. Control, dependency, timing, lifecycle responsibility and the evidence each route produces are the others.