Common Mistakes When Choosing an HVAC System

Common Mistakes When Choosing an HVAC System

When designing an HVAC system for any industrial or commercial premises, there are many things to keep in mind and sometimes many things that are too often forgotten.


For example, if you have been a heating contractor for 30 years surely you can design a heating system in the same way you always have done?


With new regulations within the building industry that outline materials authorised for use on new buildings and the upcoming legislation changes within the HVAC industry, it’s important that each building is assessed thoroughly and each system designed individually to ensure it’s safety and efficiency.

Do Not Forget The Math


The basic rule of thumb has become a widely used tool when calculating heat loss with some contractors even using heat loss calculation apps, and this rule has never changed. This will not always give you the correct calculations as although this technique has not altered, many other contributing factors when designing an efficient system have. These changes include building structures of industrial and commercial premises including how the building is insulated and the various processes that are carried out within a single facility.

One Size Does Not Fit All


Incorrect heat loss analysis can introduce a broad range of issues that can affect the efficiency or even safety of any heating system.


Another common mistake with new HVAC installation is the incorrect flue sizing for the appliance or application. The primary purpose of the flue is to transfer the combustion emissions out of the building and into the atmosphere.

When sizing the flue, it is important to match the internal diameter of the flue with the outlet on the appliance.

Flue termination is also a key point and should not be located in a position that can allow products of combustion into the building. This could compromise the safety of any system. Manufacturers will usually supply the information required to choose and install the correct flue for each appliance.


Pipe sizing is also a major factor if the pipework is undersized there will be insufficient gas pressures for your system to operate correctly. This can lead to incorrect combustion, nuisance lockouts and damage to your new heating installation

All gas installations new and existing must comply with all current regulations and manufacturers installation instructions.

Heating Equipment Is Not The Only Thing That Is Condensing


In the interests of efficiency and energy saving, a lot of businesses are actively adopting lean manufacturing techniques. This means that space limitation is also an issue as a significant amount of the building will be optimised for maximum production efficiency with some buildings utilising most or all of their floor space. That’s where the design of an appropriate alternative to floor standing heating would be necessary.

Activate Your Warranty


Although completing a warranty card may seem like a lengthy process, it is a significant step for any industrial heating installation. This means that companies can contact you should there be a significant update regarding your product. They will also have all of the appliance information should you need to contact them with any questions or issues. It also provides peace of mind that should there be a problem with your product throughout the length of the warranty that it will be replaced or repaired (this will be different with various manufacturers.


With the industry continually evolving with very different requirements from industrial and commercial facilities it’s important to adhere to all of the relevant regulations and follow all of the manufacturer’s instructions and recommendations. These regulations and recommendations coupled with staying up to date with any product or system training while adopting a “not one size fit all” attitude you can design an efficient system every time.