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The Lennox 43K53 Flame Sensor is a critical OEM safety component engineered for precise flame rectification in gas-fired heating systems
High-voltage or standard 24V AC systems will damage the switching mechanism
Reliable Oil Return: Features a high-response stainless steel float for precise lubricant management
Built to handle standard 24V AC control circuits
Carrier HH57ZC003 Enthalpy Switch 321894-709 The Lennox 43K53 Flame SensorThe Carrier HH57ZC003 Enthalpy Switch is a critical component for optimizing economizer control systems and enhancing energy management in commercial HVACR applications. This genuine OEM replacement part measures both ambient temperature and relative humidity to calculate air enthalpy, providing precise relay output for damper modulation. By evaluating real time atmospheric conditions rather than simple dry bulb temperature, the HH57ZC003 determines
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