steam heating system vapor stat controller

c rafferty

insatalled new boiler in a two pipe wet return steam heating system. when boiler calls for heat, the boiler fires for aprox 2 mins, then cycles off. does this about 8-12 times until tstat is satisfied. any sugestions on how to increase the cycle time. vapor stat is set at 8oz.

Fred Harwood_2

Vaporstat

Is it cycling with the Vaporstat? Or with the anticipator on the thermostat?

frankiewrench

What about..............

........the ever popular quick vents? If they're slow then the steam pressure at the boiler could rise to 8 oz. shut down and wait for the pressure to vent. test the vents

c rafferty

vapor stat

Fred Harwood_2

Vaporstat

Cycling on the Vaporstat before set temp suggests first that air can't get out of the system. Check your end of main vents.

Dan C.

If it's a two pipe system with vents on the radiators then you don't need a vaporstat. you can use a pressuretrol and operate at 1 1/2 psi. Two pipe with vents and wet returns is not a vapor system.

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