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hydronic heating circulator question Rick 12-24-2006
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Posted by Rick on December 24, 2006, 1:43 pm


First time poster...avid reader. In november the oil furnace tech came
to do the annual inspection and cleaning. Apparently, he needed to
replace the transformer, which he did. So the other day I happen to be
down near the furnace and notice a humming sound. It is the circulator
pump. It seems even with the heat side of the boiler off, the pump is
still running. It never used to be that way. When we turned the heat
off, the pump was off as well. It also looks like something is missing.
Just from memory, I think there was either a relay or a seperate
transformer wired in before the pump to prevent it from running all the
time. Does anyone know what is missing and hoe it's supposed to be
wired in. I would call the oil company again but were in the country
and don't have a choice who to use and I don't like who were stuck
with. I really don't want to pay for another service call.
Thanks,
Rick
Almost forgot... it's a John woods JWF 307V boiler
White-Rodgers 8A05A-101 transformer
Grundfos pump
thermostat is wired to the R and G terminals of the transformer, Com is
open


Posted by Stubby on December 24, 2006, 2:09 pm


Mine is wired so that the thermostat applies power (24 vac) to a relay.
The relay starts the boiler (flame) and applies 120 vac to the
circulator motor. The circuits are simple and you should be able to
figure them out. It sounds as if the relay thinks a thermostat is "on"
all the time. Get out your meter! Use a clip lead to simulate a
contact closure.



Rick wrote:
> First time poster...avid reader. In november the oil furnace tech came
> to do the annual inspection and cleaning. Apparently, he needed to
> replace the transformer, which he did. So the other day I happen to be
> down near the furnace and notice a humming sound. It is the circulator
> pump. It seems even with the heat side of the boiler off, the pump is
> still running. It never used to be that way. When we turned the heat
> off, the pump was off as well. It also looks like something is missing.
> Just from memory, I think there was either a relay or a seperate
> transformer wired in before the pump to prevent it from running all the
> time. Does anyone know what is missing and hoe it's supposed to be
> wired in. I would call the oil company again but were in the country
> and don't have a choice who to use and I don't like who were stuck
> with. I really don't want to pay for another service call.
> Thanks,
> Rick
> Almost forgot... it's a John woods JWF 307V boiler
> White-Rodgers 8A05A-101 transformer
> Grundfos pump
> thermostat is wired to the R and G terminals of the transformer, Com is
> open
>

Posted by Rick on December 24, 2006, 2:15 pm


>From what I remember, there was a seperate relay coming off the
transformer that isn't there anymore.
Stubby wrote:
> Mine is wired so that the thermostat applies power (24 vac) to a relay.
> The relay starts the boiler (flame) and applies 120 vac to the
> circulator motor. The circuits are simple and you should be able to
> figure them out. It sounds as if the relay thinks a thermostat is "on"
> all the time. Get out your meter! Use a clip lead to simulate a
> contact closure.
>
>
>
> Rick wrote:
> > First time poster...avid reader. In november the oil furnace tech came
> > to do the annual inspection and cleaning. Apparently, he needed to
> > replace the transformer, which he did. So the other day I happen to be
> > down near the furnace and notice a humming sound. It is the circulator
> > pump. It seems even with the heat side of the boiler off, the pump is
> > still running. It never used to be that way. When we turned the heat
> > off, the pump was off as well. It also looks like something is missing.
> > Just from memory, I think there was either a relay or a seperate
> > transformer wired in before the pump to prevent it from running all the
> > time. Does anyone know what is missing and hoe it's supposed to be
> > wired in. I would call the oil company again but were in the country
> > and don't have a choice who to use and I don't like who were stuck
> > with. I really don't want to pay for another service call.
> > Thanks,
> > Rick
> > Almost forgot... it's a John woods JWF 307V boiler
> > White-Rodgers 8A05A-101 transformer
> > Grundfos pump
> > thermostat is wired to the R and G terminals of the transformer, Com is
> > open
> >


Posted by Rick on December 24, 2006, 3:05 pm


The guy wired the circulator pump hot all the time so it won't shut
off. Can I wire in a seperate 24V transformer to the thermostat
terminals directly to the circ. pump?
Rick wrote:
> >From what I remember, there was a seperate relay coming off the
> transformer that isn't there anymore.
> Stubby wrote:
> > Mine is wired so that the thermostat applies power (24 vac) to a relay.
> > The relay starts the boiler (flame) and applies 120 vac to the
> > circulator motor. The circuits are simple and you should be able to
> > figure them out. It sounds as if the relay thinks a thermostat is "on"
> > all the time. Get out your meter! Use a clip lead to simulate a
> > contact closure.
> >
> >
> >
> > Rick wrote:
> > > First time poster...avid reader. In november the oil furnace tech came
> > > to do the annual inspection and cleaning. Apparently, he needed to
> > > replace the transformer, which he did. So the other day I happen to be
> > > down near the furnace and notice a humming sound. It is the circulator
> > > pump. It seems even with the heat side of the boiler off, the pump is
> > > still running. It never used to be that way. When we turned the heat
> > > off, the pump was off as well. It also looks like something is missing.
> > > Just from memory, I think there was either a relay or a seperate
> > > transformer wired in before the pump to prevent it from running all the
> > > time. Does anyone know what is missing and hoe it's supposed to be
> > > wired in. I would call the oil company again but were in the country
> > > and don't have a choice who to use and I don't like who were stuck
> > > with. I really don't want to pay for another service call.
> > > Thanks,
> > > Rick
> > > Almost forgot... it's a John woods JWF 307V boiler
> > > White-Rodgers 8A05A-101 transformer
> > > Grundfos pump
> > > thermostat is wired to the R and G terminals of the transformer, Com is
> > > open
> > >


Posted by RBM on December 24, 2006, 3:11 pm


You could wire it to a separate relay, however the relay you have is a
double pole relay and should be able to control the circulator. If the
thermostat does not control the circulator, I'd call the service company
back and correct their mistake


> The guy wired the circulator pump hot all the time so it won't shut
> off. Can I wire in a seperate 24V transformer to the thermostat
> terminals directly to the circ. pump?
> Rick wrote:
>> >From what I remember, there was a seperate relay coming off the
>> transformer that isn't there anymore.
>> Stubby wrote:
>> > Mine is wired so that the thermostat applies power (24 vac) to a relay.
>> > The relay starts the boiler (flame) and applies 120 vac to the
>> > circulator motor. The circuits are simple and you should be able to
>> > figure them out. It sounds as if the relay thinks a thermostat is "on"
>> > all the time. Get out your meter! Use a clip lead to simulate a
>> > contact closure.
>> >
>> >
>> >
>> > Rick wrote:
>> > > First time poster...avid reader. In november the oil furnace tech
>> > > came
>> > > to do the annual inspection and cleaning. Apparently, he needed to
>> > > replace the transformer, which he did. So the other day I happen to
>> > > be
>> > > down near the furnace and notice a humming sound. It is the
>> > > circulator
>> > > pump. It seems even with the heat side of the boiler off, the pump is
>> > > still running. It never used to be that way. When we turned the heat
>> > > off, the pump was off as well. It also looks like something is
>> > > missing.
>> > > Just from memory, I think there was either a relay or a seperate
>> > > transformer wired in before the pump to prevent it from running all
>> > > the
>> > > time. Does anyone know what is missing and hoe it's supposed to be
>> > > wired in. I would call the oil company again but were in the country
>> > > and don't have a choice who to use and I don't like who were stuck
>> > > with. I really don't want to pay for another service call.
>> > > Thanks,
>> > > Rick
>> > > Almost forgot... it's a John woods JWF 307V boiler
>> > > White-Rodgers 8A05A-101 transformer
>> > > Grundfos pump
>> > > thermostat is wired to the R and G terminals of the transformer, Com
>> > > is
>> > > open
>> > >
>



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