This model is frequently used for lighting control applications

The built-in test switch allows for a localized functional check of the internal relay and burner circuit without draining the entire system

3 Amp draw against your existing transformer and controller ratings to prevent nuisance tripping

Industrial-Grade Construction: Built with high-temp resistant components to withstand the rigorous cycling environments of gas wall furnaces

provides hospital-grade filtration by capturing over 95% of airborne particles and bioaerosols down to 0

York S1-700078 Sight Glass 321042-401 This model is frequently usedThe York S1 700078 Sight Glass (Model SA 13) is a critical diagnostic component designed for precision refrigerant flow monitoring in commercial and residential HVAC systems. Engineered for high pressure environments, this SA 13 sightglass provides a high visibility interface to inspect for bubbles, flash gas, and moisture contamination within the liquid line. Featuring a robust fiberglass body and a clear view window, it allows technicians to verify