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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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Page 15 of 15
HVAC21 Nov 202510 min
How Long Does a Ceiling-Mounted FCU Last? Retrofit vs Replacement Guide
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BMS Technical19 Nov 202516 min
End-of-Line Resistors: Values, Wiring and Fire Alarm Circuits
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BMS Technical17 Nov 202515 min
How to Integrate Old Belimo VAV Actuators with Trend IQ412 Controllers
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HVAC Systems10 Nov 202512 min
AHUs vs FCUs: Why Modern Buildings Need Both
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