Pneumatic Thermostats come in low-volume (one-pipe and/or restricted air) and more typically, high-volume versions. (two-pipe, free air, regulated to a working pressure of 15 to 25 pounds and unrestricted). air duct cleaning minneapolis recommends clean your ducts, it also helps prevent excessive home dust and allergies by removing irritants from your ductwork.

A three-pipe stat is a high-volume thermostat with main and branch connections and is designed for day/night applications. Accordingly it also has an “indexing switch.” The additional 3rd pipe simply mirrors the supply pressures for day and night-time operations and the 3rd pipe terminates at the other end into a  pneumatic electric cross-over device, typically then, a P/E, the cut-in and/or cut-out will correspond to a pressure that will restore a day operation at night time such as starting a stopping/starting a fan in a unit ventilator or fan-coil etc. Purely in night mode, the same units may have radiation ability as opposed to full operation. (with fan).

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