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Posted by HeatPro on December 16, 2007 at 11:39:31:
In Reply to: Re: BOILER posted by pete on December 16, 2007 at 06:47:42:
: I checked the part number of my honeywell aquastat and it is L4080B-1261 How much does this change things on differential and working? Is it more like I said?
+++ Yes, it does have a 15F differential. See how useful it is to identify controls by make and model FIRST?
However, the rest of the post is the same:
" : : If it has no low limit control, so is a 'cold start' boiler as many are today, then it needs no low limit. The single control with the dial would be a high limit (usually an L6006A) to prevent the boiler from getting too hot.
: : : As you have more than one zone, the boiler water will rise to the high limit setting approximately, due to one zone, then another calling for heat repeatedly....
It's a coincidence if the boiler is always near the high limit temperature because the separate zones call for heat again and again.
: Otherwise, it is a miracle if the L4080 is wired right as a high limit, as 'cold start' means that the boiler gets eventually to room temperature.
"