boiler is short cycling

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  #1  
Old 01-12-10, 06:15 AM
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boiler is short cycling

My friend has a new gas fired Utica boiler and steam radiators throughout the house. just replaced the same boiler that was 20 years old. when it builds pressure, the cut off valve shuts down. Pressure builds up to 2.5 pounds and cuts off. when the pressure drops to .5 pounds then it refires again.
The vents have been replaced and the thermostat has been taken out of the equation along with a new pressure regulator.
Any suggestions?

thanks, JB
 
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Old 01-12-10, 06:53 AM
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My pressuretroll is set to the same limit, 2.5. That shouldn't be a problem. Did the problem occur before the vents were replaced? What about the low water safety.
 
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Old 01-12-10, 04:21 PM
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Other than the cut-off pressure being too high whats the problem. It is doing what it is suppose to do. The new boilers will normally cycle due to making steam much faster.
Were all the radiators measured to determine proper boiler size? If not maybe boiler is over sized. If properly sized I would suspect it still would cycle.
 
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