Siemens Building Technology 188-0031 Stat 321894-706 Fail-Safe Operation: Mechanical spring return

Fail-Safe Operation: Mechanical spring return ensures the valve returns to its stem up position during power or signal failure

While dimensions may look similar to other brands

Key Benefits Specifically engineered for Williams 600A Series 60

OEM Reliability: Replacing worn burners with genuine Lochinvar 100135304 parts protects the heat exchanger from hot spots and uneven heat distribution

Precision Mounting: Utilizes a standard 48 Frame and 0

Siemens Building Technology 188-0031 Stat 321894-706 Fail-Safe Operation: Mechanical spring returnThe Siemens 188 0031 (Model TH 188D) is a professional grade unit mount pneumatic thermostat designed for precision control in fan coil units and unit ventilators. As a direct acting (DA) instrument, it employs a liquid filled sensing element and a remote bulb to provide gradual acting control of heating or cooling mediums. Operating on a force balance principle, this thermostat ensures high linearity and rapid response to temperature fluctuations