News for hackers. Stuff that matters.

A comment on What a Year at a Mechanic Shop Taught Me About Process (2016). Parent comment

Re:What a Year at a Mechanic Shop Taught Me About Process (2... by jcims on Saturday November 16, 2019 @09:33PM (#21556207)
I never worked on very large systems, mostly small commercial and residential. A buddy of mine supervises HVAC for a large commercial facility and we were talking about their makeup air. Basically it sounded like the building is effectively hermetically sealed until the makeup air vents open because of interior pressure or O2/CO2 levels. Seemed kind of creepy that there was some active system in charge of that. How do you know when it's not working?
[ Parent | on HN ]
Re:What a Year at a Mechanic Shop Taught Me About Process (2... by t34543 on Saturday November 16, 2019 @11:05PM (#21556506)
The same CO2 sensors that call for make up air are hopefully monitored. Sick building syndrome.

Buildings are poorly sealed in my experience. In California code requires economizers on RTUs and they are almost always broken / stuck partially open. In the Inland Empire for example the actuators bind up from sand and often seize. Nobody wants to pay to fix just that, if they even know it’s busted.

I stay under 10 tons. Things are different in bigger buildings!

[ Parent | on HN ]