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The Honeywell 40003916-021/U Replacement Head is designed for use with zone valves that operate with a spring return to open. It operates at twenty-four volts and is suitable for fifty or sixty hertz applications. This replacement head can withstand maximum ambient temperatures of one hundred twenty-five degrees Fahrenheit, making it a reliable choice for HVAC systems.
The Honeywell replacement head provides efficient operation for heating and cooling systems, ensuring reliability in various conditions.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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