Were there no isolator valves?
I wonder if the original design included isolator valves which were then removed in the “value engineering” phase of the project?
At one time, I worked in the Building Controls Industry (control systems for heating & ventilation). One story that went the rounds in the industry was about a public sector project which included a lot of powerful cooling systems to keep motors and computers cool. The inverters and motor control systems where “value engineered” out of the project. The contractor was asked to go back 6-9 months after handover and retrofit them - at a much greater cost than if they had been installed originally. Once they were in and working, their payback in energy savings was around 6 weeks. All on the public purse.
