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luc
10-29-2009, 08:38 AM
We have two boilers with CF1400 Beckett burners.

Before doing the annual service call last week, we had some problems with one of the burner tripping everyday or so. When the service man came to clean the boilers, he found that there was a really bad combustion in the burners and the boilers. The electrodes and flat plate, on the nozzle line assembly, were dark black with crust on the flat plate. He cleaned the the nozzle asssembly and replaced the nozzle. Then, he checked all the setting and did some reajustment. With the combustion test we could seen that there was too much draft in the chimney.

Now we have problems with both the burners tripping everyday or so. Just want to have your input on what might be the problem. Any idea on what might be tripping the boilers? Could it be to much draft in the chimney?

As for for the bad combustion and excessive draft, this might be due to the changes that we made on the chimney over a year(June 2008) ago when we replaced an old water heater by two new ones. There was a draft control on the old water heater. The two new water heater each have their draft control at the exit of the heater. Other then the draft control on the water heater, there is no other draft control on the chimney. The two boilers and water heaters are on the same chimney. They connect to a main horizontal chimney which then connect to the vertical stack. The boilers are closer to the vertical stack while the water heaters are farther away.

Thanks for the input,
luc

julio.caluori
10-30-2009, 12:57 PM
It might be your cad cell that is filthy, try cleaning it.

luc
10-31-2009, 10:56 AM
Anything else that could cause the coccasional tripping of boilers?

julio.caluori
10-31-2009, 04:41 PM
Anything else that could cause the coccasional tripping of boilers?A faulty cad cell is all I know of. You might want to wait till someone with more experience answers as I am a beginner.

Peter Griffin
11-01-2009, 05:30 AM
The CF1400 series will operate against a 1.0 positive pressure. If the chimney is pulling negative (and it should) adjustment will need to be made by means of a larger draft regulator in the smoke pipe to bring the draft to .4 negative or somewhere in that range. Too much draft will pull the flame off the retention head. If the problem is intermittent it is likely because draft is different depending on the weather

luc
11-11-2009, 10:28 AM
Thanks Peter for replying.

The service man came at the beginnig of the week. We increased the pressure on the nozzle for the low fire. It was too low and it could have caused some of the tripping problems. We also installed a barometric draft regulator on the flue pipe, at the exit of each boiler, just before it connects to the main horizontal connector.

Before the draft regulators were installed we had draft measurement of around -0.22 "WC at the breach of the boilers. With the draft regulators installed, we have -0.01 to -0.08 "WC at the breach of the boilers. The draft seeams to vary.

With this much draft the chimney seems really oversized. It is about 42 feet high with a diameter of 14''. Is there anything that can be installed on the main horizontal connector or on the stack to reduce the draft?

Luc