Honeywell 4006B Doesn't Work...Maybe

huntabsarokee · Post by **huntabsarokee** » Wed. Dec. 10, 2008 9:36 am

I have a 4006b installed in my by pass loop per Keystoker's instructions and the wires are hooked up to my 3rd zone to dump the excess heat. The other night my boiler temp was 220 and the 4006b did not turn on the circulator. Actually I couldn't even remember what the 4006b was set at so I started to play. I lowered the setting on the 4006b all the way down to 185 or so before the circulator came on and then it only ran for a minutes or two. The differential was set at 15. I didn't see a drop it temp on the boiler gauge. This morning I did the same test where I lowered the set point on the 4006b and I had to get it about 25 degrees lower than the boiler temp before it would kick on the circulator and again it didn't run very long and no change on the boiler gauge so I increased the differential to 20 on the 4006. I guess my questions are what are most people using as set points on the 4006 and should there be that much of a difference between my boiler gauge and the thermacouple on the 4006? I only installed the KA6 about 6 weeks ago so everything is new.
Thanks!

huntabsarokee · Post by **huntabsarokee** » Wed. Dec. 10, 2008 10:22 am

Since I posted this I have been doing some thinking. Maybe I should have done more of that befors I stated the plumbing.

So the circulators turns on from the signal from the 4006 which is in the bypass loop. Won't some of the water that is cold, returning from the zone that just turned on, travel up the bypass loop to the 4006 rather than enter the bottom of the boiler thus dropping the temp at the 4006 and shutting off the circulator? Makes senes to me. I thought an easy fix would be to install a flow valve at the bottom of the bypass loop so all the return water has to go into the bottom of the boiler. Only problem is my buddy that helped me with the plumbing believes that the purpose of the bypass loop is so some cold water does travel up the bypass loop and mixes with the hot water coming out of the boiler thus avoiding sending 180 degree water to your radiators and I guess I will use the word "shocking" them.

Freddy · Post by **Freddy** » Wed. Dec. 10, 2008 10:37 am

A 4006 used as a dump zone should sense the water IN the boiler, not water in a pipe. Most are in a well that's directly into the body of the boiler.

huntabsarokee · Post by **huntabsarokee** » Wed. Dec. 10, 2008 11:10 am

on further review I think I agree. I could always take it out. I have a tapping on the side of the boiler that I think would work.

Machinist · Post by **Machinist** » Wed. Dec. 10, 2008 5:23 pm

I have a 4006b on my system, installed in the bypass loop, and works as advertised. Differential is set at 10.

When I made my first fire in my boiler I noticed that the bypass was much hotter than the top of the boiler, with the sheet metal removed.

I do question the quality of the pressure/temperature gauge supplied with the boiler. Mine is slow to react to pressure so I installed a pressure gauge separately. I trust the Honeywell aquastats more than the temp gauge. I've been looking for another temp/pressure gauge.

huntabsarokee · Post by **huntabsarokee** » Wed. Dec. 10, 2008 8:06 pm

I have a make up water valve on my boiler which is set to 12psi but the gauge that came with the boiler always read 16-18psi so its definitely off a bit. I think I may move the 4006 to the boiler this weekend since it only involves a threaded connection and no soldering.