water boiler shortcycling

john_27

anyone see this before?...I understand short cycling in a steam boiler......but not water.....any thoughts?

ed wallace

short cycling

maybe a bad ciculater

Al Letellier

short cycling

Any boiler can short cycle. If you're having a problem, a little more detail would help us help you. Exactly what is happening?

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Michal

more info and ideas here

First off, is your complaint that its coming on too often? when did you realize that? new or old boiler, give us temp settings. if circulator were bad it wouldnt cycle cause the hot water would not leave the boiler so it would satisfy itself on high limit.

i have seen boilers short cycle, but you need to be aware that new boilers hold little water and will cycle frequently, there is nothing wrong, just how they work. I installed a new Weil Mclain in a house and the guy called me back and said it comes on for 2 minutes and shuts off, well he has a coil in the boiler for domestic, so it will cyle more. But thats how it runs, even when heat is on, it will cycle on since it can get the water to temperature fairly quick. Also If you have your aquastat settings too close apart, it will cycle very frequently, they should be set at 180 high, 160 low and a 20 degree differential. thats the best I can give you

Joe Mattiello

thermostat anticipator setting?

What’s the thermostat anticipator set to? If using a Taco 570 series zonevalve with a .9 amp rating, the anticipator should be set to minimum .9, or you will get short cycling of boiler.

Taco, Inc.
Joe Mattiello
Technical Service Technician
joemat@taco-hvac.com
401-942-8000 X 484
www.taco-hvac.com