This document is a technical specification and compliance diagram for public lavatory plumbing systems. The diagram illustrates a recirculating hot water loop configuration that complies with energy code requirements for public lavatories, specifically addressing fixture supply water volume limitations and piping specifications.
The system incorporates KHS flow-splitter models (6510603200 and 6510604000) with an integral shut-off valve requiring an access panel above the ceiling. A reducer is specified for sizing with reference to isometrics. The schematic shows branch connections to fixtures that must not exceed 2 feet, with piping routed through inside wall cavities. Table C404.5.1 provides nominal pipe sizes ranging from 3/4 inches to 2 inches or larger, with corresponding liquid ounces per foot length and maximum piping lengths. The maximum allowable pipe volume method (C404.5.2) limits water volume in piping to specific thresholds: public lavatory faucets are restricted to 2 ounces (0.06 liters) maximum, while other plumbing fixtures on plumbing appliances cannot exceed 0.5 gallons (1.89 liters). The diagram includes heat trace temperature maintenance system considerations for heated water supply pipe termination. This specification ensures energy efficiency in public lavatory installations by controlling the volume of heated water maintained in distribution piping.
