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Is this the thing about various pieces of process equipment adding humidity and heat to the air in your shop?

Back when, Princeton University built a new library. Modern lighting, climate control, the works. During a tour, one of the trustees complained that 'It doesn't smell like a library.' The librarian leading the tour answered 'That, sir, is the smell of books decaying.'

It sounds like the visible steam is a result of the mineral deposits that come from heating and boiling impure water. These same mineral deposits build up and destroy the boiler. Your customer is complaining that they don't see signs of the boiler destroying itself.

The Quick fix is to remove the Red wire from the Coil on the relay. just cap that off.

If the PCB time delay was in place, then that would use the 24 VAC Red wire for constant power for the PCB. Without the PCB in place there is nothing to interrupt the common side for the relay coil from completing the circuit.   Since that PCB part of the R8222 relay is no longer available, someone just removed it to get the system operating temporarily.  Probably 10 years ago temporarily This system without the 24 VAC red wire to the R8222 relay ust means there is no time delay on start or on finish for the fan to use all the energy stored in the refrigerant coil when the thermostat is satisfied.  Probably time to look at new equipment a piece at a time over the next few years.

GB 142 isn't a combi as far as I know. Nut then I could becerong

OK. Step back a square or two here.

We have a critical question which, I think, has not been clearly answered.

Do we have a wet return serving only drips from a steam main? Such as might be found on a one pipe system?

Do we have a "dre return" which is, in fact, a continuation of a steam main back to a boiler?

Or do we have a true dry return up there somewhere, which would be found on a two pipe system?

The rules for connecting them to each other, venting them, and the elevations they run at aren't made up old timers rules. They are basic physics, and getting it wrong is one of the more common reasons why systems don't work well.

What's the point?

When you've got equipment being engineered / manufactured poorly that dumps how many thousands of pounds? of refrigerant into the atmosphere per year, why does it matter? I've got a feeling it's thousands of pounds per month……….but I really don't know.

Now, some will argue the equipment leaks because it's made so thin to meet efficiency requirements. If that's the case, then those requirements are wrong and need to change.

/Rant.

was it ever enforced in the us other than for the most egregious industrial violations?

fsu is in michigan.