The Time Delay Relay Board (120V) is a control component engineered to manage the automatic blowdown system on Mr.Steam CU Commercial Steam Bath Generators. Working alongside the system's blowdown timer, this board initiates and terminates the blowdown valve, allowing the operator to set discharge duration anywhere from 10 to 30 seconds to properly clear minerals and salts from the boiler at the correct intervals. Consistent, well-timed blowdown cycles are essential in commercial installations, where mineral buildup can affect heating performance and shorten component life over continuous daily use. One board is required per system on any CU Commercial generator equipped with the automatic blowdown accessory, making it a critical part for restoring correct maintenance-cycle function after a board failure. Straightforward to install and engineered to match factory specifications, this genuine Mr.Steam replacement part helps facility operators keep their blowdown maintenance system running reliably, session after session.