Dunkirk getting to Hot?

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Old 01-12-13, 04:31 PM
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Question Dunkirk getting to Hot?

Have an 92 Dunkirk XE3 broiler and all of a sudden it appears that the system is running or the water is getting to hot? The temp. Gauge red arrow is set at around 120 and it looks like when the unit kicks on it is getting to hot and goes pass the Red marker and shuts off. Then when it cools down it kicks back on. Boiler is working ok but it's cycling off and on to much? Any suggestions before I call for service.
Aquastat is only 2 yrs old.
 
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Old 01-12-13, 05:00 PM
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Post a photo of the gauge. The red arrow is often "altitude." Tell us the temperature and pressure reading on the gauge.
 
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Old 01-12-13, 05:17 PM
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Photo 1 is when it is off.
Photo 2 is when it goes past Red marker and kicks off.
T-stat still says heat on but boiler kicks off
 
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Old 01-12-13, 05:25 PM
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The red arrow was manually set by the installer, as a guide for the max temp. Your shut-off temp looks to be about 185 deg - no problem at all. Your turn-on temp seems to be 120 deg -which may be too low if you have a warm-start control setup. Give us an assortment of wide-angle photos of your boiler and tell us the model number of your aquastat and a close-up of it. It should be a gray, rectangular box mounted on your boiler, with wires going to it. Remove the box cover to see the model number.
 
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Old 01-12-13, 05:33 PM
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By the way - the gauge itself seems somwhat normal, but the bezel looks like it re-entered from outer-space. Any idea why?
 
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Old 01-12-13, 05:35 PM
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For reference would your unit be an XEB-3????

See install manual here...

http://www.dunkirk.com/uploads/produ...218a84b904.pdf
 
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Old 01-12-13, 05:36 PM
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the bezel looks like it re-entered from outer-space. Any idea why?
Not a bezel, just a hole in the jacket. You are seeing the insulation peeking at you on the top and left side, and the gray cast iron, and on the bottom a shadow from the flash...
 
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Old 01-12-13, 05:38 PM
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History. Last 5-6 yrs
T-stat always set at 69. When it hits 67, boiler kicks on and stays on until stat hits 70 and shuts off the boiler.
The temp on the boiler never went pass the red arrow.
Dunkirk XE3 boiler with aqua stat Honeywell L8148 the was replaced 1/10
 
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Old 01-12-13, 06:45 PM
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From what I you tell us, things seem to be normal. Have you observed any unusual performance? Your aquastat has a single hi-limit contact and the differential is fixed. It is a simple warm-start set-up.

Tell us what prompted your concern.
 
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Old 01-12-13, 06:49 PM
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Before: T-stat always set at 69. When it hits 67, boiler kicks on and stays on until stat hits 70 and shuts off the boiler.
Now it just stays at 69 with the boiler with kicking off and on constantly.
 
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Old 01-12-13, 06:52 PM
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Have you changed the batteries in the t stat?
 
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Old 01-12-13, 06:57 PM
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Yes. Beginning of cold season everything was fine then this problem started about 2 weeks ago.
Even if I crank up the temp to like 74, the boiler kicks on for 5 minutes then kicks off for 5 and then kicks on for 5 minutes, and so on until it reaches the t-stat temp
 
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Old 01-12-13, 07:13 PM
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Yes, what? What about lawrosa's question about the thermostat? Is it battery powered?
 
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Old 01-12-13, 07:14 PM
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Yes the batteries have been replaced.
 
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Old 01-12-13, 09:47 PM
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When the boiler kicks on and off every 5 min what does the boiler temp say when it does this?

180f off - 120 f on????
 
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Old 01-13-13, 03:09 AM
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Off at around 185, then back on about 5 minutes later, it only drops about 5 degrees before going back on. It's more like 5 min on, 5 min off, 5 min on, 5 min off and so on.....
 
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Old 01-13-13, 06:45 AM
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What is the model aquastat???

I would lower it slightly to like 175-180. Then I would need to see if you have an adjustable diff. Possibly you can adjust that or you aquastat may be faulty....
 
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Old 01-13-13, 07:01 AM
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I don't mean to be rude, but its a Honeywell L8148 that was replaced in 1/10 as stated in some of my previous postings.
 
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Old 01-13-13, 09:21 AM
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Not rude... but one thing to understand is that as mods we read and reply to HUNDREDS of messages each day... please forgive if we don't have time to read back and refresh our memories, or completely miss something...

But it's ok, we know you aren't being rude.
 
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Old 01-13-13, 12:09 PM
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OK, another question. The aqua stat has two terminals marked "T" "T" that go the t stat. The wires are connected to the W and Rc terminals inside the t stat. Is this correct for a hot water boiler system only? Can't find anything via google for boiler only connections.
 
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Old 01-13-13, 04:09 PM
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Some t'stats have different labels. We don't know what t'stat you have, but yes, most every one I've seen will use the W and Rh OR Rc (since in most of these cases they will be jumpered) for heat only.

What t'stat do you have?
 

Last edited by NJT; 01-13-13 at 04:49 PM.
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Old 01-13-13, 04:13 PM
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Have a Honeywell RTH221 t stat
 
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Old 01-13-13, 04:47 PM
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I believe this install booklet has the information you are looking for:

https://customer.honeywell.com/resou...69-2060EFS.pdf

Google CAN be our friend!
 
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Old 01-13-13, 05:12 PM
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It seems like we're going around the mulberry bush here. Initially, the problem was that the boiler was running too hot. Then it was that heat calls came and go every few minutes. Now, it's how to wire an aquastat. I can't really follow this. Maybe it's time to call in an experienced serviceman?
 
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