Maintains airtight combustion seals to prevent carbon monoxide leakage into the living space

and moisture

Standard round dimensions (approx

it is carbon buildup or a depleted millivolt output

the 68671 sensor delivers the industrial-level durability required for consistent system performance and long-term calibration stability in the field

Functional Devices TR40VA004 Transformer Maintains airtight combustion seals toThe Functional Devices TR40VA004 is a versatile 40VA multi tap power transformer engineered for reliable 24Vac secondary output in demanding HVACR and building automation environments. Designed for maximum flexibility, this unit handles primary voltages of 120V, 208V, 240V, and 277V, making it a standard truck stock item for commercial and residential service calls. The TR40VA004 features inherently limited over current protection, ensuring the safety