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- How Do I Adjust a Honeywell Pressuretrol Controller? A Honeywell Pressuretrol Controller is a device that monitors the pressure in a boiler. The Pressuretrol.
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Pressuretrol question - Home Improvementquote: Let's take a look at the basic controls on a one- pipe (and a two- pipe) system. The pressuretrol determines the operating range of the boiler during the heating cycle.
It's important to understand that a heating boiler doesn't make steam all the time. It only does that when the thermostat clicks on. During a call for heat, the boiler will cycle up to the cut- out setting of the pressuretrol. At that point, the pressuretrol will shut off the burner. Some pressuretrols show the cut- out setting as "Differential." Usually, you'll add that "Differential" to the "Cut- In" setting to get the "Cut- Out" setting.
Be careful, though, because some pressuretrols show "Differential" as a number to be subtracted from the cut- out setting. Take a few minutes to read the instructions and think about what the manufacturer is telling you. When the pressuretrol reaches its cut- out setting, steam will be moving out into the system and condensing in the pipes. This condensing process will cause an overall drop in system pressure. When the system cycles down to the cut- in pressuretrol setting, the pressuretrol will re- start the burner, as long as the thermostat is still calling for heat.
If the thermostat isn't calling for heat, the burner will remain off, and the steam pressure will drop to zero (atmospheric pressure). Usually, you should set the pressuretrol to turn the burner on at one- half psi and off at the lowest possible pressure required to heat the furthest radiator. If that pressure winds up being more than 2 psi, something is probably wrong. Most likely, the air vents aren't working properly.
Years ago, fitters used vaporstats to control the boiler. These are like pressuretrols, but they're much more sensitive. A vaporstat measures pressure in ounces. They're still available today, but they're more expensive than pressuretrols. Nevertheless, along with quality air vents, a vaporstat is probably the best investment you can make.
You see when it comes to steam, low pressure is the key to success. If you're concerned about the burner because it’s short- cycling, look to the air vents, not the pressuretrol. Main vents are the key here. Get rid of the air and the building should heat without short cycling.
This is a great article, not the one I was talking about though. Master. Plumbers. All Rights Reserved.