Aquastat troubles

Aquastat troubles

PostBy: Dave 1234 On: Sat Dec 07, 2013 12:47 pm

My aquastat was behaving for 8 months. ( used ). Its a Honeywell L8148E . Monday she started to act up. When the circ pumps were on, and the boiler temp was low she would stay closed and keep power going to the stoker until my safety aquastat opened at its high temp setting.

Normal issue ? Or should I look deeper for a reason ?

New one, Also scavenged but nice is working well. 8-)

Dave
Dave 1234
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: Aquastat troubles

PostBy: Rob R. On: Sat Dec 07, 2013 2:55 pm

My first question is why were you using a L8148E? That is a cold-start aquastat with no low limit control. It is normal for the stoker to keep running during a heat call until the high limit setting is reached.

Next question, how do you have the timer wired into the aquastat?
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: Aquastat troubles

PostBy: Dave 1234 On: Sat Dec 07, 2013 3:15 pm

Rob , that was the 'stat I got with my 520. And it was fine right along 'till this week.

Thanks !

and don't forget im a hacker at this. :o
Dave 1234
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520


Re: Aquastat troubles

PostBy: Rob R. On: Sat Dec 07, 2013 3:31 pm

So what about the timer?
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: Aquastat troubles

PostBy: Dave 1234 On: Sat Dec 07, 2013 4:13 pm

My timer is powered from the L4006E 'stat.( the over-temp ) safety. It can power ,and will, the stoker every half hour for 60 seconds. It bypasses the triple aquastat.
Dave
Rob R. wrote:So what about the timer?
Dave 1234
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: Aquastat troubles

PostBy: Dave 1234 On: Mon Dec 16, 2013 1:06 am

So after a bit of drama with intermittent boiler over-temps for the last 2 weeks I'm pretty sure I found the gremlin causing it all.
It appears that my timer was powering the stoker any old time it felt like it . She is dropped out of the picture for now, we will see if all is well after a few days.

Dave
Dave 1234
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520


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