BMS-Building Management System Fundamentals: From A to Z

Explore how a building management system controller uses sensor data and onboard logic to determine the control loop response and adjust zone dampers to regulate room conditions.

Discover how pid control, the popular closed-loop algorithm in building and industrial automation, uses proportional, integral, and derivative terms to minimize error between set point and control variable.

Relative humidity sensors measure air moisture and output signals like 0–10 V or 4–20 mA for energy analysis, cooling control, and maintaining comfort and equipment safety in buildings.

Learn how pressure transmitters measure static, differential, and dynamic pressure, interpret total pressure as static plus dynamic, and select sensors and placements to monitor air and water flow accurately.

Explore gas sensors in buildings that monitor carbon monoxide and carbon dioxide and trigger BMS-driven ventilation when levels rise to maintain air quality.

Explore how pressure independent control valves (PICV) combine two valves in one to maintain constant differential pressure and flow in chilled and hot water systems, reducing fluctuations and energy use.

Install the Honeywell S7 015B1060 duct transmitter with its flange-mounted probe. Outputs 0–10 V for humidity and temperature, using a 24 V power supply.

The space temperature sensor measures temperature inside conditioned spaces using a Honeywell TR 21 thermistor (NTC 20 k) with two-point cables and no external power supply.

Explore the Honeywell DPT 5000 differential pressure transmitter, an active device that outputs 0–10 V or 4–20 mA and uses jumpers to select 0–5 or 0–10 kPa ranges.

Explore the Honeywell DPS 400 differential pressure switch, its set point, dry contact output, three connections (common, normally open, normally closed), ports, and the duct kit.

Explore honeywell damper actuators, including two-position and modulating models with end switches, 24-volt power, direct/reverse acting, manual clutch, and 0–10 V control signals from a DDC controller.

Learn the two main point types in building management systems— io or physical points and software points— and how digital and analog points drive, monitor, and control equipment.

Explore a practical DDC panel with a Honeywell eagle controller, fuses, mix module, field terminals, alarm lists, and settings, including IP, firmware, and communication ports.

Explore the basics of hvac within building management system fundamentals, including seven processes: heating, cooling, humidification, dehumidification, cleaning, ventilation, movement. Compare central and local systems.

Understand absolute humidity as the mass of water vapor per volume of dry air (g/m³). Note that relative humidity is vapor amount relative to air capacity at given temperature (saturation).

Explore constant air volume systems, where a constant supply is heated or cooled to meet zone loads via cooling and heating coils, with single duct configurations and energy efficiency considerations.

Understand the primary-secondary chilled water system with two loops, decoupler isolation, and variable speed secondary pumps controlled by differential pressure to manage delta T across loads.

Learn to read an MCC panel drawing for a fan controlled by a VFD with a bypass star delta arrangement, including auto and hand modes and BMS wiring.