Daikin-McQuay 331893901 Sensor

The Daikin-McQuay 331893901 Flow Sensor is a critical OEM component used for precise fluid and air movement monitoring in commercial HVAC systems. This 24VAC/VDC flow sensor is the direct 331893901 cross reference for the legacy 330571401 part number, ensuring a seamless drop-in replacement without field modifications. Engineered for high-accuracy detection, it provides the necessary feedback to the system controller to prevent low-flow conditions that could lead to heat exchanger scaling or freeze-up. The inclusion of a factory-matched adapter ensures the mechanical connection maintains a leak-proof seal and correct probe depth within the piping or ductwork. For technicians servicing Daikin or McQuay chillers and air handlers, utilizing this genuine Daikin flow switch replacement is essential for maintaining factory specifications and long-term equipment reliability.

Key Benefits for Technicians:

• Direct OEM Replacement: Replaces McQuay part 330571401 with updated sensor technology for better signal stability.
• Dual Voltage Compatibility: Operates on both 24VAC and 24VDC power supplies to match various control board outputs.
• Enhanced System Protection: Provides real-time flow verification to protect expensive downstream components from stagnation or overheating.
• Complete Hardware Kit: Ships with the required 331893901 adapter to eliminate site-visit delays and ensure a proper thread match or flange fit.

Common Service Questions:

Is the 331893901 interchangeable with the older 330571401?
Yes, the 331893901 is the official modern successor to the 330571401. It maintains the same electrical characteristics and physical footprint required for a direct exchange.

What happens if the flow sensor fails or sends an incorrect signal?
Failure typically results in a "Low Flow" fault code, which will lock out the compressor or heating elements to prevent equipment damage. Using a Daikin-McQuay OEM sensor ensures the signal matches the controller’s expected frequency or resistance curve.

Does this sensor require a specific orientation during installation?
Yes, most flow sensors are directional. Ensure the arrow on the body or the probe orientation matches the direction of fluid flow as specified in the technical manual for your specific McQuay or Daikin unit.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.