clare

[hem057]

have a clare furnace (and I know many will say replace it; you're right) with the mercury switch, and the white/rogers sparker, and unit occasionally will not start, when I arrive the inducer is running, no voltage to the sparker? turn power off and on, unit starts....
?

[coolguysfl]

Call a Lic. tech -- this is not a DIY item. It requires tools & training to ensure your safety.

[htg guy]

It needs a thorough cleaning by a qualified htg company. That model was know to have that problem, usually each fall upon startup. A cleaning will most likely take care of the problem.

FYI! The Clare Bros. have disappeared completely.

[hem057]

thanks, I'm not the home owner, but I have been in the heating,refrigeration, a/c trade for 25 years, and this unit does not need to be cleaned at this point, it has an intermittent problem, it will work fine, actually it is the mother of another heating contractors home that I do alot of work for, and when I arrive I will just turn the unit off and on and it will light perfectly, but his sister is telling me that she will come home for lunch and the ventor motor is running and the house is cooling off, when I got there yesterday there was no voltage to the sparker, ventor motor running, and obviously no pilot nor burner on, reset and away it went, worked great, I know clare brothers are gone, but this unit is still in good condition and I like a challenge, so we could rip it out and put in a new unit, but at this point I would like to solve the problem, any thoughts as to why the w/r ignitor is loosing its 24 volts, when ventor is running,

[Mr Bill]

ventor motor running? Are you talking about inducer motor?

[jetstream]

sounds like the sequencer

[Mr Bill]

Originally posted by jetstream
sounds like the sequencer

On a gas furnace?

[jpeloni]

If it has a ventor, or inducer, it probably has a pressure switch, I would check there first. You say there's no 24 volts to the ignition module? Check all your safeties. Good luck...

[jetstream]

Yeah, clare hasd a sequencer, brings on the venter, then the 24v gas circuit a bit later.

[HeyBob]

Originally posted by mrbillpro

Originally posted by jetstream
sounds like the sequencer

On a gas furnace?

Yea...If I remember correctly, those Clare MegaSave furnaces had an electric heat sequence in the upper right hand side behind a cover....when they would screw up they could do exactly what the original poster is saying.

Also, if it has the original combustion blower assembly, they were metal with a plastic coating inside, they would delaminate and plug the drains.

So, it could also be a partially plugged drain, by the time you show up, it has "fixed" itself and drained down.

There is a company in Toledo that handles parts for those junkers!

[Mr Bill]

Originally posted by jetstream
Yeah, clare hasd a sequencer, brings on the venter, then the 24v gas circuit a bit later.

Thanks! I never even heard of a clare down here in Texas
I knew a girl name Clare once that keep me pretty warm. Lol!

[HeyBob]

Originally posted by mrbillpro

Originally posted by jetstream
Yeah, clare hasd a sequencer, brings on the venter, then the 24v gas circuit a bit later.

Thanks! I never even heard of a clare down here in Texas
I knew a girl name Clare once that keep me pretty warm. Lol!

Those furnaces are made in Canada...as cold as it gets up there, you would think Canadians should be able to build a better furnace!

[hem057]

thanks, now that is helpful,
I noticed on the wiring diagram that the sequencer is the only thing in the circuit before the ignitor, and probably the only part that could allow the inducer (ventor) motor to run and loose the power to the ignitor, but it is rare (in my experience) for them to go bad, I will change it out today and let you know
maybe clare is gone for that very reason, actually I do not like this system, i.e. the mercury switch arrangement, I recall their was a carrier unit that used them in the past too, (rooftop?) ad no wonder they are no longer in use