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149 articles found
HVAC SystemsFeatured
Why the Frost Stat Is on the Extract Side of a Plate Heat Exchanger
On a plate heat exchanger AHU the frost protection reads the extract, not the incoming fresh air, and engineers rewire it believing it to be a mistake. Why the ice forms on the extract side, how pack frost protection differs from the coil frost stat, and what actually triggers a defrost.
11 Oct 20269 min read
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Latest Articles
HVAC Systems
What Is a Recuperator AHU, and How Does It Compare With a Thermal Wheel?
A recuperator AHU recovers heat through a static plate pack; a thermal wheel does the same job with a rotating matrix and moves moisture with it. What separates them, the efficiency figures the manufacturers actually publish, and the different point schedule each type lands on a controls contractor.
11 Oct 20269 min
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BMS Technical
AHU Controls: How Air Handling Unit Control Sequences Actually Work
A full guide to AHU control sequences: start/stop and optimum start, the damper sequence, fan control, coil sequencing through a deadband, CO₂ demand ventilation, heat recovery by device type, both frost protections, and what to prove at commissioning before you accept a unit.
11 Oct 202612 min
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Case Studies
24V Window Actuator Wiring After a School Roof Replacement
Royal Harbour Academy, Ramsgate: eight weather-damaged 24V window actuator feeds re-cabled in 4 mm² fire-resistant cable, AHU control cabling drawn back and re-terminated, and extract fans wired back to the BMS during a roof replacement.
2 Oct 20267 min
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HVAC Systems
VAV Installation: TROX VAVs & Sontay CO₂ on a Trend BMS
A real VAV installation on a refurbished office floor: four TROX TA-Silenzio extract VAVs and Sontay duct CO₂ sensors wired back to a Trend panel two floors up. Core-by-core terminations, the signal-range and mode checks that decide whether the floor works, and what good looks like at handover.
28 Sept 20269 min
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BMS Technical19 May 20264 min
AHU-2 Extract Fan Inverter Replacement: Unidrive to Vacon NXP
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Plant Rooms18 May 202614 min
Cooling Tower BMS Integration: Controls, Water Treatment, and Legionella Compliance
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Fire Safety17 May 202611 min
Motorised Smoke Fire Damper Installation: Actuator Wiring, Panel Install & Commissioning
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Plant Rooms15 May 202615 min
Plant Room Refurbishment: BMS Controls for Boiler Houses, Chiller Plants, and AHU Rooms
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Bms Fundamentals14 May 202614 min
Smart Building vs BMS: Do You Actually Need IoT, or Just Better Controls?
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Network & Data Cabling14 May 202610 min
Network Cabling for New Builds: Getting It Right at First Fix Stage
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Commissioning Maintenance14 May 202612 min
Why Your BMS Commissioning Was Probably Done Wrong
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Network & Data Cabling14 May 20269 min
Fibre Optic vs Copper Cabling: When to Use Each in Commercial Buildings
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Installation Retrofit14 May 202612 min
Legacy BMS Upgrade: Retrofit or Replace? A Practical Decision Guide
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Network & Data Cabling14 May 20268 min
Structured Cabling Standards UK: What BS EN 50173 Means for Your Install
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