and multi-stage gas valve regulation

This Direct Acting (DA) control operates on a single pole single throw (SPST) snap-action mechanism

It uses SPDT switches to shut down the burner and trigger an alarm or secondary device if the water level reaches a critical low point

creating a compact motor starter assembly

and low-pressure steam applications up to 15 psi

Resideo TH140-28-01-B Programmable Thermostat 318172-701 and multi-stage gas valve regulationThe Resideo TH140 28 01 B Programmable Thermostat is a versatile 7 day programmable digital thermostat designed for high precision control in hydronic, line voltage, and low voltage heating environments. Engineered to handle everything from millivolt systems to 240 Vac heating applications, this unit is a staple for technicians installing electric baseboard heaters, as well as gas or oil fired boilers. With a single pole double throw (SPDT) switching