BMS cabling: what to use for sensors, comms and power, and keeping it apart
Choosing cable for BMS sensors, outputs and networks, why screens and twisted pairs matter, Band I and Band II segregation, and labelling that saves hours later.
Topic
HVAC controls
How heating, ventilation and cooling plant is controlled: loops, sensors, valves and strategies.
BMS commissioning, step by step: from factory test to witnessing
How BMS commissioning runs on a real project: planning, off-site testing, point-to-point checks, functional testing, witnessing, handover and seasonal re-checks.
How to fault-find a BMS without guessing
A step-by-step method for BMS fault-finding: understand the complaint, read the trends, split the problem, prove each step, then write it up properly.
Testing and calibrating a BMS installation: test gear, insulation tests and sensor checks
Safe electrical testing around BMS electronics, choosing and calibrating test equipment, checking sensors against references, and recording it all properly.
Damper actuators: torque, spring return and the things that go wrong
Choosing and fitting damper actuators: open/close vs modulating, sizing torque, spring return and fail-safe positions, linkages, feedback, and common faults on site.
Hand-off-auto, motor starters and interlocks: BMS panel basics
How a BMS control panel actually starts a fan or pump: HOA switches, contactors, DOL and star-delta starters, VSDs, run and fault signals, and hardwired interlocks.
Testing third-party integrations: commissioning a BMS high-level interface
Commissioning BACnet and Modbus links to chillers, boilers, VRF and meters: agree the points list, check scaling and writes, and test what happens when the link fails.
How an AHU control strategy works, from start-up to shutdown
Follow a typical air handling unit through its day: proving airflow, sequencing heat recovery, heating and cooling, fan speed control, night purge and a safe stop.
AHU frost protection: keeping coils from freezing and heat recovery from icing up
Frost thermostats, BMS low-limit control, cold-start routines, preheat, dampers that fail safe and heat recovery anti-icing, plus how to test it all before winter.
BMS sensors: picking the right type and putting it in the right place
Thermistors, PT1000s, 0–10 V and 4–20 mA, how cable length skews readings, and the sensor placement mistakes behind a lot of comfort complaints.
How a BMS runs heating plant: weather compensation, optimum start and boiler sequencing
Weather compensation curves, optimum start and stop, staging and rotating multiple boilers, interlocks, and the heating faults that quietly burn money.
Chiller plant control: sequencing, setpoint reset and low delta-T
What the BMS should and shouldn't do with chillers, how sequencing and setpoint reset work, primary/secondary circuits, and the low delta-T problem.
Sizing HVAC control valves: Kvs, valve authority and a worked example
2-port vs 3-port valves, what valve authority actually means on site, a step-by-step Kvs sizing example for a heating coil, plus PICVs and actuator checks.
7 hydraulic problems that get blamed on the BMS
When a heating or cooling loop won't behave, the cause is often in the pipework rather than the controls. Seven common culprits and how to prove each one.
PID loops in HVAC: what P, I and D really do, and how to tune them on site
A practical look at proportional, integral and derivative control in building services, why loops hunt, and a tuning method that works on real plant.
Putting VRF and heat pumps on the BMS
How VRF and air-to-water heat pumps connect to a BMS, what the BMS should leave alone, the 'last command wins' problem, and stopping heating and cooling fighting.
What is a BMS? A plain-English guide to building management systems
What a building management system actually does, how the controllers, network and front end fit together, and how to tell a well-run BMS from a neglected one.