Daikin-McQuay 910121753 Temp Controller

The Daikin-McQuay 910121753 is a purpose-built wall-mounted temperature sensor engineered specifically for integration with the MicroTech III (MTIII) unit controller. This is not a standard residential thermostat; it is a high-precision 10k ohm thermistor interface designed for water source heat pump (WSHP) applications, including both constant volume (CAV) and variable air volume (VAV) systems. The controller features a critical tenant override button that allows users to trigger occupied mode for a set duration directly from the space, streamlining building management without specialized software. With integrated occupancy switches (Occ/Unoc/Off) and fan mode selection (Auto/On), this OEM HVAC part provides contractors with a direct-replacement solution for maintaining precise climate control and communication with the main chiller or heat pump logic board. The 910121753 also includes a status LED for real-time diagnostic feedback and clear-alarm capability when held, ensuring seamless HVAC system compatibility and reduced downtime during service calls.

• Precise Space Sensing: Utilizes a high-accuracy 10k Type II thermistor for reliable room temperature adjustment and feedback.
• Operational Efficiency: Manual occupancy switch allows for immediate toggling between heating, cooling, and fan-only modes to reduce energy waste.
• Service-Friendly Interface: Integrated override reset functionality permits the clearing of specific unit alarms directly from the sensor cover.
• Commercial Versatility: Fully compatible with Daikin MicroTech III logic, supporting complex sequences of operation common in larger facility chillers.

Is this a 7-day programmable thermostat?
No, the 910121753 is a MicroTech III wall sensor that interfaces with a centralized unit controller. Programming and main logic are handled at the equipment level, while this device provides local sensing and setpoint adjustment.

Can I use this for both VAV and CAV systems?
Yes. In CAV systems, it serves as the primary control for heating and cooling transitions. In VAV systems, it is typically used as the primary sensor for maintaining unoccupied heating and cooling setpoints.

What does the status LED indicate?
The green LED provides status definitions based on the MTIII controller logic, including unit enable status and specific fault alerts.

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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.