How to properly set cut-out pressure of vaportrol?

Steve Garson_6

In all the reading of Dan's books and here on the wall, I have never seen instructions on how to determine the correct cut-out and cut-in pressure of a steam boiler.

My intuition has the cut-out when radiators are half hot, since by that point, they will be all hot in another couple minutes, but I really don't know.

How do the steam pros set their vaportrols?

Steamhead (in transit)

I usually start

with a Main setting of 8 ounces and a Diff of 6. This will cycle the boiler between 8 and 2 ounces. Many Vapor systems were designed around a maximum pressure of 8 ounces.

A low-pressure gauge- one that reads in ounces or inches of water- is a big help when setting up a Vaporstat. You can actually see what pressure the system runs at during different parts of the cycle.

The 30-pound gauge must remain to satisfy Code.

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