As a dual-pressure thermostat

This 24VDC general service valve provides rapid response times and durable performance

this heating system sensor is the standard solution for resolving intermittent "no flame" lockouts caused by carbon buildup or cracked ceramics on furnace ignition parts

as well as 120 VAC on the secondary input

Where is the 110123 relief valve typically used

Lennox 99M99 Pressure Switch 322838-754 As a dual-pressure thermostatAs a service ready high pressure switch for diagnostic and repair calls, the Lennox 99M99 is a critical safety component designed for high side refrigerant monitoring. This genuine Lennox replacement part is engineered to actuate at 590 PSI and features an automatic reset at 418 PSI, ensuring the compressor is protected against catastrophic over pressure conditions common in R 410A systems. Built with 106 inch leads and rated for 120 240 VAC (375 VA),