weil mclain 66 chamber insulation

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Old 10-07-13, 02:28 AM
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Question weil mclain 66 chamber insulation

hi

I took the front plate off my boiler and the refractory insulation on the back of the plate is in tough shape. Can I run the boiler without it ? I dont believe that the front plate has ever been off and the boiler is 26 years old , so how did the techs clean it out in the past? It's an oil fired weil mclain model 66 forced hot water system.

Thanks
Bob
 
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Old 10-07-13, 05:22 PM
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Chamber kits are readily available for that boiler & only take an hour or two to install. I wouldn't fire it without the chamber.
 
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Old 10-14-13, 05:48 AM
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weil mclain 66 chamber insulation

Thanks for the reply Grady


I took your avice and replaced the chamber with a lynn 1060 kit.
It did take about 2hours and fit perfectly. The next time I do a clean out do I just remove the motor to clean the chamber or do I remove the plate everytime?

Thanks again
Bob
 
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Old 10-14-13, 02:41 PM
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You can just remove the burner. In general the chamber doesn't need to be vacuumed every year. Normally every 5 years or so is fine unless you get a lot of debris in there. When you do vacuum it out, be very careful not to damage the chamber.
 
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Old 10-14-13, 05:22 PM
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weil mclain 66 chamber insulation

Grady

Weil Mclain says I should be running a 1.25 x80a nozzle but I found a .75x70a installed, any idea why someone would have changed it this far from the specs.

Thanks Bob
 
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Old 10-15-13, 07:29 PM
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It's not unusual to downfire a boiler but from 1.25 to .75gph is quite a drop. Often downfiring is done because of a lack of draft or due to short cycling. What model is the boiler (366,466, etc.)?
 
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Old 10-15-13, 08:21 PM
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weil mclain 66 chamber insulation

the boiler is a weil mclain p466he with a becket afg burner
 
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Old 10-15-13, 08:29 PM
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That boiler should have an F6 burner head, a 2.75" static plate, the pump pressure should be set at 100#, & the specified nozzle is a 1.25 x 80* B Delavan. You need to check the static plate, burner head, & pump pressure. Let me know the results. The chamber may have failed due to condensation.
 
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Old 10-16-13, 07:22 AM
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weil mclain 66 chamber insulation

Hi Grady

I looked over 20+ years worth of tune up/clean out receipts and nothing appears to have been changed from stock. The pump has is a suntec a2va-7116 100psi.
After it was cleaned the last time it started groaning occasionaly at start up and I would smell smoke afterwards,but the boiler would stay running. Would this be caused by the smaller nozzle being installed? There was a lot of soot in the heat exchanger but I had gone more than 2 winters between cleanouts. Do you think I should change the nozzle back or see how it runs for now.
The chimney is 27 feet tall so I think the draft is ok.

Thanks Bob
 
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Old 10-16-13, 03:29 PM
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If it's been working that way for 20+ years, I wouldn't monkey with it. Sorry I don't understand "groaning". Is there delayed ignition? If so, it could be the ignition transformer getting weak.
 
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Old 10-16-13, 05:58 PM
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weil mclain 66 chamber insulation

IT MAKES A GROANING OR MOANING TYPE SOUND OCCATIONALLY WHEN IT STARTS AND THEN YOU CAN SMELL SMOKE AFTERWORDS. IT DOESN'T HAPPEN A LOT BUT YOU CAn HEAR THE DRAFT REGULATOR SLAM SHUT SHORTLY AFTER THE NOISE. WHAT IS DELAYED IGNITION?
 
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Old 10-16-13, 07:10 PM
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Delayed ignition is the failure of the burner to ignite as soon as the motor starts. Unless your burner has been modified, the flame should appear within a fraction of a second of the motor starting.
 
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