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Old 12-04-2010, 10:49 PM   #1
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Low water cutoff keeps shutting boiler off


Hello. I am new to this forum and I am seeking some advice. Over this past summer I converted from oil to gas and have a burnham 145,000 BTU boiler. The issue that occurs is that the boiler will be able to heat my house, but the way it operates does not make sense to me. Her is what happens....


The sight glass will read about 60% full, a good 3-4 inches above the low operating point on the boiler. It will be running and then turn off. The red light on the low water cutoff will be then be flashing and the automatice water feeders green light will be flashing, HOWEVER the feeder doesn't fill the boiler with water. 30 Seconds later the lights mentioned above go out and the boiler turns back on. This goes on continuously until the thermostat reaches its desired temperature.

The water feeder eventually did feed the boiler and must have filled it too much as the sight glass was completely filled and my pipes were making alot of banging noises. I drained it to about 60% and that stopped, but the boiler turning on and off persists. I dont thing the boiler tunrns on and off from a cold start, but I will have to double check that.


Any Ideas? I never had this problem with my old 1949 American standard boiler. Any help would be greatly appreciated!



-Tom

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Old 12-05-2010, 04:54 AM   #2
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Low water cutoff keeps shutting boiler off


Ayuh,... Is this a Steam system, or hot water,..??
It sounds like you're trying to run a steam boiler as a hot water boiler...

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Old 12-05-2010, 05:37 AM   #3
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Low water cutoff keeps shutting boiler off


Could be improper piping. Post pics of all the piping at the boiler.

Was the boiler skimmed. Or are they coming back to do that.
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Old 12-06-2010, 07:47 AM   #4
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Low water cutoff keeps shutting boiler off


I have steam heat. I have posted some pics of the piping. Incidently the boiler turned this morning 20 times from 7:00am-8:00am. Most of the run times were about 20 seconds. The thermostat read 70.75 with a pre-set temp of 70.50.

The term skimmed has never been mentioned to me.
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Old 12-06-2010, 10:03 AM   #5
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Low water cutoff keeps shutting boiler off


looks like a new install. Who piped the water to the boiler with black iron pipe ?? IMO ,,Water lines shouldn't be piped with that pipe
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Old 12-06-2010, 11:18 AM   #6
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Low water cutoff keeps shutting boiler off


It was a new install back in August of 2010. The install was done by a plumber that was given to me by National Grid. The town inspector didn't have a problem with the black pipe. What can go wrong with that selection?
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Old 12-06-2010, 11:41 AM   #7
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Low water cutoff keeps shutting boiler off


black pipe will rust. It may be ok for your area. They won't let us use it here.I would call the installer back on the cycling issue. It could be flame sensor among other things

Last edited by kenmac; 12-06-2010 at 11:46 AM.
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Old 12-06-2010, 04:26 PM   #8
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Low water cutoff keeps shutting boiler off


Why is the LWCO not piped into the boiler itself like it belongs?

It needs to be piped into the boiler.

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