Daikin-McQuay 044275100 Thermostat

The Daikin-McQuay 044275100 Thermostat is a heavy-duty 120V SPDT thermostat designed for precise temperature regulation in legacy and modern fan coil units. Engineered for reliable 55-90°F temperature control, this analog dial-style controller is the direct OEM replacement for a wide range of Daikin and McQuay equipment vintages. The Single-Pole Double-Throw (SPDT) configuration allows for versatile integration, managing either heating or cooling circuits to maintain setpoint accuracy in commercial environments. This Daikin-McQuay HVAC replacement part is essential for technicians servicing FCHB, FCHF, FTSF, and TSF units, providing a robust interface that eliminates the complexity of digital menus while ensuring consistent contact closure. Its compatibility spans unit sizes 03-15 and 02-12 across multiple production eras, making it a staple for maintaining vintage A, B, D, E, and G series infrastructure.

• Broad Compatibility: Drop-in replacement for McQuay 044275100 across FTSB, FTSS, and FTPF series fan coils.
• High-Voltage Reliability: Native 120V operation eliminates the need for external Step-down transformers in standard line-voltage applications.
• Rugged SPDT Switching: Features a durable Single-Pole Double-Throw internal switch for reliable changeover between heating and cooling modes.
• Wide Operating Range: Covers a standard 55°F to 90°F range, suitable for various commercial comfort cooling and heating setpoints.
• Precision Dial Control: Provides tactile feedback and simple setpoint adjustments, reducing callback issues associated with complex electronics.

Which McQuay units are compatible with the 044275100?
This thermostat is specifically designed for Daikin-McQuay FCHB/FCHF, FTSF/FTPF, and TSF/TSB units. It is the standard service part for unit sizes 03-15, 02-12, and 021-121.

Can this thermostat handle line voltage?
Yes, this is a 120V HVAC thermostat. Always verify your specific wiring diagram and ensure power is disconnected before installing this SPDT dial control.

How do I wire the SPDT terminals for heating or cooling?
The SPDT configuration allows the thermostat to make or break a circuit on temperature rise or fall. Refer to the specific unit's terminal strip labels to determine the correct common, heating, and cooling load connections.

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.