9-B162 Controls2.pdf

This document is a set of control diagrams for steam heating and domestic water metering systems. The diagrams illustrate the piping, valve placement, and instrumentation required for a building's steam and hot water supply infrastructure.

The steam/domestic heat sequence of operations describes a system that supplies steam from a campus central utility to the building, reducing pressure through a control valve and distributing it to existing building systems and heating water through heat exchangers. The hot water distribution system includes a circulation pump with capacity control based on differential pressure, a heat exchanger with opening/closing capabilities, and provisions for preventing short cycling. The system incorporates differential pressure controls that maintain set points between hot water supply and return lines, with adjustable thresholds to prevent pump cycling. Additional features include outdoor air temperature compensation for hot water supply temperature control, with setpoints ranging from approximately 140-180°F depending on outdoor conditions. The diagrams specify valve positioning requirements, including check valves on return lines and isolation valves at strategic points. A makeup water station with chemical feed provisions is required, along with a vortex shedding flow meter and temperature sensors for monitoring system performance. The domestic water metering diagram shows a meter installation with pressure compensation and flow monitoring capabilities, with connections to campus infrastructure.