L4080B1295 question

John Penwarden_2

I have the feeling that this is a cheap aquastat from honeywell. The supply house that I bought the WH from does not carry a replacement stat, nor do they carry a comparable model.

Assuming that the probe fits the well, could I theoretically pick another model (4006) that would have the same range without any problems? What is the 4006 rated for?

John Penwarden_2

L4080B1295 Question

I have this aquastat mounted on a 7 yr old Crown 30 gal indirect water heater. The heater is currently over-heating the water (according to the set point on the stat). I am finding that the stat is heating about 20 deg over the setting (120=140). I have pulled the well out of the tank and it is clean. The zone valve on the boiler piping is operating correctly. I do not believe that I am getting any ghost flow, since the return pipe to the boiler is room temp when there is no call for heat from the HW heater. If I set the stat to it's lowest setting (no number on the dial), I get about 130 deg water. If I set it to 180, I get 180. What gives with this thing? I found a supply house that can replace it, ($56), but I don't want to replace it unless I know why it is doing this, and that it is bad.

Any help is greatly appreciated. On the plus side, We do have cleaner dishes now.

kevin

4080...

are not really acurate. The 4006 version that honeywell makes is much better.

Unknown

The 4080 series

is an OEM control only I believe. Usually if there is a "B" after the basic number it may be a reverse acting control. The 4006 or 6006 can be used to replace most aquastats. They are both in Honeywell catalog.

John Cockerill

overheating

When do you get the high temperatures? When the circulator is on / Off when the burner is On/ Off When the boiler is sitting still?

John Penwarden_2

L4080B1295 Question

I'm not really sure when I get the hight temp. It's always there that I know of. Currently I have the aquastat set to the lowest setting and It's still too hot (130). I check the boiler supply/return pipes whenever I'm nearby and the whole house can be calling for heat, but the zone return line from the WH is cold. So I don't think that there is a problem with the circ or the zone valve, just the aquastat. FYI, this started about 3 months ago. I set the WH to 180 to sanitized some brewing equipment. After the cleaning was done, I turned the stat back to 120. The wife said it was too hot, so I turned it to the lowest setting, still too hot. That's when I got the thermometer out and found that lowest setting was giving me 130 and the 120 setting was giving me 140.