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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 Installation16 Jul 202612 min

BMS Electrical Installation in London: What It Actually Involves

On most London commercial buildings the BMS controllers and strategy are fine — it's the electrical work underneath that lets the system down. Here's what BMS electrical contractors in London actually do, and where it usually goes wrong.

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Innovation12 Jul 20268 min

AI in Building Management Systems: What's Working, What's Risky, What's Hype

The controls industry splits "AI in BMS" into three technologies with very different maturity levels — here's what's proven, what's risky, and what to check before you buy.

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Security12 Jul 20268 min

BMS Cyber Security: Why Your Building Management System Is the Soft Way In

Building management systems are quietly becoming the softest route into a UK commercial building's network. Here's what the exposure looks like, why regulation is catching up, and the proportionate fixes that don't mean ripping out your BMS.

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BMS Technical12 Jul 20269 min

BMS Vendor Lock-In: Who Actually Owns Your Building's Controls?

Most BMS lock-in has nothing to do with the protocol. It's the passwords, licences, files and certificates nobody handed over — here's what to ask for before the contractor leaves site.

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BMS Upgrades12 Jul 20269 min

BMS Lifecycle Planning: How to Build a Five-Year Controls Upgrade Strategy

Most estates upgrade their building controls the same way they replace a burst pipe — in a panic, at the worst possible moment, for the highest possible price. BMS lifecycle planning turns that reactive spend into a costed, prioritised programme you can put in front of a finance director.

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HVAC Systems12 Jul 20269 min

Heat-Pump Performance Monitoring: What Your BMS Should Trend and Measure

A commercial heat pump can pass commissioning and still quietly run at half its rated efficiency. Unless the BMS is measuring energy in, heat out and the temperatures that drive COP, the first sign of a problem is the bill. Here is exactly what your BMS should trend.

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Energy Management10 Jul 202610 min

The UK Net Zero Carbon Buildings Standard: Why Your BMS Decides Whether You Can Prove It

The UK Net Zero Carbon Buildings Standard verifies buildings on 12 months of metered in-use data. What UKNZCBS means for your BMS, metering and controls.

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BMS Upgrades15 Jun 202614 min

BMS Upgrade in London: Migrating Legacy Controls in High-Value Commercial Buildings

London's commercial buildings are sitting on legacy BMS platforms that waste energy, frustrate tenants, and block MEES compliance. Here is what a controlled migration to a modern platform looks like — phased, non-disruptive, and designed to pay for itself.

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BMS Upgrades12 Jun 202615 min

BMS Upgrade in Kent: When Legacy Systems Cost More Than Replacement

Your Trend 963, Satchwell MicroNet, or Honeywell Excel 500 in Kent is not just old — it is actively costing you money every month in wasted energy, reactive callouts, and lost tenant confidence. Here is how to plan an upgrade that pays for itself.

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BMS Installation10 Jun 202613 min

BMS Installation in London: Costs, Timelines, and What Goes Wrong

BMS installation in London's commercial buildings is more complex and more expensive than anywhere else in the UK. Here is what drives the cost, what goes wrong, and how to avoid the most common failures.

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Building Management Insights

Why the Frost Stat Is on the Extract Side of a Plate Heat Exchanger

Latest Articles

More Articles

BMS Electrical Installation in London: What It Actually Involves

AI in Building Management Systems: What's Working, What's Risky, What's Hype

BMS Cyber Security: Why Your Building Management System Is the Soft Way In

BMS Vendor Lock-In: Who Actually Owns Your Building's Controls?

BMS Lifecycle Planning: How to Build a Five-Year Controls Upgrade Strategy

Heat-Pump Performance Monitoring: What Your BMS Should Trend and Measure

The UK Net Zero Carbon Buildings Standard: Why Your BMS Decides Whether You Can Prove It

BMS Upgrade in London: Migrating Legacy Controls in High-Value Commercial Buildings

BMS Upgrade in Kent: When Legacy Systems Cost More Than Replacement

BMS Installation in London: Costs, Timelines, and What Goes Wrong

Ready to Optimise Your Building?