Boiler Burner Cuts Off

Reply

  #1  
Old 11-03-18, 09:42 AM
D
Member
Thread Starter
Join Date: Nov 2018
Location: USA
Posts: 1
Received 0 Votes on 0 Posts
Unhappy Boiler Burner Cuts Off

I have a Utica boiler with a Honeywell control. It has an intermittent but very annoying problem: sometimes the main burner has trouble lighting. When the problem occurs, the sequence is always the same:
1. The ignition control module activates the spark igniter which lights the intermittent pilot.
2. The spark stops, and the pilot stays on.
3. The main burner valve opens, and the main burner ignites for up to a few seconds.
4. The ignition control shuts off both the pilot and the main burner and restarts the ignition procedure.
5. After a predetermined trial period, the system shuts down and must be manually reset (the old Honeywell control would just continuously retry; the new one does 20 tries or 90 seconds trial for ignition, with a dipswitch to adjust to 15 seconds).
The suspected cause is a weak signal voltage through the flame rod. The flame rod, ground wire, spark wire, and ignition control module have all been replaced (control was updated to S8610u3009). The ground wire has been relocated as close to the burner as possible, using a 24k gold plated terminal at the control end, and at one point this fixed the problem for a few months. Once I think it gave a low input voltage code (8 flashes). There are three zone valves connected to the system and fed by the transformer; could that be affecting control? Should we replace or upgrade the transformer? This would involve replacing the main control or upgrading to a transformer with a higher amperage rating. Note: the ignition control module usually indicates 5 milliamps when it does manage to stay lit for more than a few seconds. Does anyone know if this is near the high end of its operating parameters?
 

Last edited by dome3; 11-03-18 at 09:44 AM. Reason: Paragraph return
Sponsored Links
  #2  
Old 11-03-18, 10:07 AM
S
Member
Join Date: Oct 2013
Location: United States
Posts: 3,006
Received 50 Votes on 47 Posts
d,
The transformer on that boiler is not made to power up zone valves. Zones valves need an external transformer for their power.

Depending on the zone valve you can basically put 3 zone valves on a 24V 40VA transformer. Taco ZV's draw the most, 3 is the limit. Honeywell is a little better.

The transformer on the boiler is there only to run the 24 circuit on the boiler.

Hope this helps a little.
 
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: