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If the manometer shows negative pressure at the valve but it fails to open when 24VAC is applied
or excessive "play" on the shaft
Enhanced Durability: Silver cadmium oxide contacts offer superior conductivity and resistance to pitting
This Lennox heat strip is primarily designed for use with CBX25UH and CBX25UHV air handlers
Siemens Building Technology QFM3101 Sensor 318518-761 If the manometer shows negativeThe Siemens Building Technology QFM3101 is a high precision duct relative humidity sensor designed for demanding building automation and HVAC control applications. Featuring a robust 4 20mA output signal, this sensor provides a linear 0 100% RH measurement with a strict 2% accuracy rating. Engineered for professional grade reliability, it functions as a direct functional cross for the HD2XMSX, ensuring seamless integration into existing control loops