Daikin-McQuay 250803500 MIT-FA-005 BACnet Programmable Fan Coil Thermostat

The Daikin-McQuay 250803500 (model MIT-FA-005) is a programmable, digital BACnet thermostat engineered for precise heating and cooling control of commercial fan coil unit systems. Designed as a wall-mounted, field-installed control device, it supports both 3-speed and modulating fan operation as well as ON/OFF or modulating valve control, making it a flexible solution for a wide range of 4-pipe HVAC configurations.

BACnet (Building Automation and Control Networks) protocol support allows this thermostat to integrate directly with building management systems (BMS), enabling centralized monitoring, scheduling, and energy optimization across commercial facilities. Two levels of password security — one for end users and a separate level for control technicians and engineers — help protect system settings and prevent unauthorized changes.

Key Features:

• Programmable digital thermostat with BACnet communication protocol for BMS integration
• Supports 3-speed or modulating fan control
• Compatible with ON/OFF or modulating valve configurations
• Full-color 128×128 pixel active LCD display with LED backlighting
• Five-button menu-driven interface for easy on-site setup and commissioning
• Adjustable setpoints; selectable Fahrenheit or Celsius display
• Two-level password security for users and technicians
• Dead band auto changeover between heating and cooling modes
• Compatible with Daikin Applied 4-pipe fan coil models: FCVH, FCVC, FCVS, FCHC, FCHH, FHVH, FHVC, FHVS, FHSS, FHSK, HCDB, and HHDB

The 250803500 BACnet thermostat is an OEM Daikin Applied component ideal for commercial buildings, healthcare facilities, educational institutions, and industrial environments where centralized HVAC control and energy efficiency are priorities. Installation manual reference: IM-1234-2.