Oil burner intermittent fault and puffback

Reply

  #1  
Old 01-13-15, 05:43 AM
Member
Thread Starter
Join Date: Jan 2015
Posts: 1
Received 0 Votes on 0 Posts
Oil burner intermittent fault and puffback

I have an older (1987?) Williamson oil burning furnace. It has a Beckett burner re-badged as a Williamson 02-693. I had it professionally serviced and it was running well last year and only reset probably once the entire season. At the end of the season I was stupid and let it run out of oil. This year I changed the tank filter, pump strainer, nozzle, and air filters myself. The burner wouldn't fire and would trip the Honeywell control after about 8 seconds or so. I disconnected and blew out the line from the tank with compressed air and re-primed the pump. I then determined that the pump was getting oil and producing pressure but the gun was not seeing any pressure. I looked at a pump diagram, took the pump apart, cleaned it, and rebuilt it. When I installed the pump the burner fired fine and I thought I was done. Since then I have been experiencing intermittent safety switch trips anywhere from once a day to once a week. I have noticed that while the burner usually fires almost instantly after the motor turns on, sometimes it takes a few seconds and there is bang, rumble, and a little bit of smoke comes out around the observation window lid. I believe this is called a puffback.
Last night I replaced the pump with an identical one from a used burner. It fired and ran fine but then tripped again sometime in the middle of the night.
the CAD cell looks OK, the electrodes look OK, the nozzle is a .85 80deg and was new this year. I noticed a little bit of oil in the air tube under the gun. It looks like it has been dripping and evaporating leaving a small puddle and some black buildup.
I have not witnessed what happens when the furnace actually shuts down so I cannot comment on the events that lead to a failure. What could be causing my problems?
Another note, I tightened up my basement a lot since last year, but the house should still be nowhere near airtight. I know this can sometimes impact natural draft appliances.
 
Sponsored Links
  #2  
Old 01-14-15, 10:29 PM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 14,013
Received 12 Votes on 11 Posts
I'm thinking weak ignitioin transformer. Sorry for the slow reply. I somehow just plain missed your question.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: