The MARS model 12749 features a patented pressure-sensitive interrupter (PSI) that safely disconnects the capacitor in the event of internal pressure buildup

particularly 15kW and 17kW models

Broad Compatibility: Engineered for use in Trane and American Standard gas heating systems and commercial rooftops

Its high-strength construction is built to withstand the rigorous duty cycles typical of industrial process control environments

Note that in most residential furnace applications

Honeywell 34886A Sun Shield The MARS model 12749 featuresAs an experienced HVAC tech, you know that keeping a remote bulb sensor exposed to direct thermal radiation is a shortcut to inaccurate cycling and premature system wear. The Honeywell 34886A Sun Shield is the professional standard for protecting Honeywell remote bulb controllers and sensors from intense UV exposure and solar gain. This heavy duty outdoor temperature sensor shield acts as a dedicated thermal barrier, ensuring your T475, T991B, T678B,