The **ALV-B41-R/Q** is a specific variant of an **Automated Logic (ALC) Zone Controller**, typically used in HVAC systems (Heating, Ventilation, and Air Conditioning). It belongs to the **ZNT (Zone Sensor/Controller)** or **ZNS** series, often integrated into Building Automation Systems (BAS). --- ### 1. Key Technical Specifications The device acts as a microprocessor-based controller designed for VAV (Variable Air Volume) or zone applications. | Component/Feature | Description | | :--- | :--- | | **Input Voltage** | 24V AC ± 10% (50/60 Hz) | | **Microprocessor** | High-speed 32-bit RISC processor | | **Memory** | Non-volatile Flash memory for program and data retention | | **Communication** | ARCNET or BACnet MS/TP (depending on firmware) | | **Output Ports** | Binary outputs for damper control or reheat valves | | **Input Ports** | Analog inputs for temperature sensors (Thermistor) and flow sensors | --- ### 2. Major Electronic Subsystems #### A. Power Supply Section This section regulates the incoming **24V AC** power. It includes: * **Bridge Rectifier:** Converts AC to DC. * **Voltage Regulators:** Steps down voltage to 5V DC and 3.3V DC to power the internal logic and sensors. * **Protection:** Varistors (MOVs) and fuses to protect against voltage surges common in industrial environments. #### B. The Actuator Interface (Specific to "R/Q") The "B41" series often includes an integrated **Damper Actuator**. * **Motor:** A brushless DC or synchronous motor. * **Feedback Potentiometer:** Provides the electronic signal for the actual position of the damper blade. * **Logic Board Interface:** Translates digital commands into physical rotation (Torque: ~35-45 in-lb). #### C. Communication & Ports * **Net Port:** A physical connection for the **LogiStat** or **ZS** room sensors. * **EIA-485 Tranceiver:** Handles the hardware layer for the BACnet or ARCNET communication, allowing the controller to "talk" to the main Building Control Unit (BCU). --- ### 3. I/O (Input/Output) Configuration The electronic board is typically populated with the following connection points: 1. **AI (Analog Inputs):** Used for 10k Ohm Thermistors (Zone Temp, Discharge Air Temp). 2. **AO (Analog Outputs):** 0-10V signals for proportional valves or fan speed control. 3. **BO (Binary Outputs):** Triac-based outputs used for 24V AC switching (to trigger contactors for electric heat or fan relays). --- ### 4. Firmware and Programming The electronics rely on **BACnet objects**. * **EPROM/Flash:** Stores the "Logic" or "Control Program" (created in EIKON). * **Battery/Capacitor:** Some models use a SuperCap or Lithium battery to maintain the Real-Time Clock (RTC) and RAM during power outages. ---