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the 51-21964-11 is the current manufacturer-specified replacement for the legacy 21964K and 51-21964-01 parts
It is ambient temperature compensated
Can this switch be used to monitor flue gases
Designed for precision fitment against the burner plate
and 9034330
Carrier 48CH402274 Heat Exchanger 318423-701 the 51-21964-11 is the currentThe Carrier 48CH402274 Heat Exchanger is an essential OEM replacement part engineered specifically for high efficiency Carrier rooftop units and commercial gas electric packaged systems. As a veteran technician knows, maintaining the integrity of the combustion cycle is paramount; this direct fit heat exchanger ensures maximum thermal transfer while preventing the mixing of flue gases with the supply airstream. Constructed from durable, corrosion
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