Description
Honeywell XL2000B3A
Technical Specifications: Power supply: 24VAC Analog input: multi-channel universal AI for temperature, humidity, 4-20mA, 0-10V Digital input: dry contact digital input channels Analog output: 0-10V analog output for valve and damper actuators Digital relay output: relay digital output Communication: RS485, support Honeywell C-Bus protocol Operating temperature: 0℃ to 50℃ Storage temperature: -20℃ to 70℃ Humidity: 10%~90% non-condensing Protection rating: IP20
Functional Features: Built-in PID algorithm for temperature and humidity closed-loop control. Support scheduling function for time-based automatic equipment on/off. Alarm function for abnormal temperature, equipment fault and sensor failure. Trend data recording for HVAC operation variables. Local logic programming for air handling unit interlock protection. Bidirectional communication with Honeywell building management system. Manual/auto bumpless transfer function.
Application Scenarios: Office building air handling unit control, shopping mall HVAC system, hospital ventilation control, factory clean room air conditioning, hotel chiller auxiliary control, school building environmental control.
Performance Parameters: PID control cycle 1 second. Measurement accuracy ±0.2% full scale for analog channels. Nonvolatile memory retains configuration and schedule data for 10 years.
Material Composition: FR4 industrial printed circuit board. Flame retardant ABS plastic housing. Screw terminal blocks for field sensor and actuator wiring. Relay components for digital output.
Structural Features: DIN rail mounting plastic housing. Front LED indicators for power, run, alarm and channel status. Screw terminals on both sides for field wiring. Internal isolation between power and signal circuits.
Working Principle: 24VAC power energizes the onboard microprocessor. Field temperature and humidity sensor signals are sampled by analog input channels. The processor compares measured value with setpoint value and executes PID calculation. Analog output signal drives valve or damper actuator to adjust air volume or water flow. Digital input collects equipment running feedback and fault signals. Controller communicates with BMS host through RS485 C-Bus to upload data and receive remote commands.
Installation Requirements: Mount on standard 35mm DIN rail inside HVAC control cabinet. Field sensor cables use twisted shielded wire. Separate low voltage signal cables and AC power cables. Avoid installation location near heating components.
Usage Notes: Do not apply voltage exceeding rated range to input terminals. Calibrate analog input channels before commissioning. Backup control logic and schedule configuration before modification. Cut off power supply before changing field wiring.
