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Help me find a new pessure switch!

Posted: Sun Nov 13, 2011 1:35 pm
by hr2pilot
I am looking to replace a sticking draft blower pressure switch (occasionally slow to activate....tapping the case throws the switch) on a 20 year old Airco Turbo 8300 mid efficiency furnace (model HMS2-130/120....Canadian manufacture).

The pressure switch to be replaced is an obsolete TriDelta brand model FS6116-659. It has no specs on the label indicating the required water column, making it hard to replace with another brand.

Anyone here online that can offer any tips, advice or help on finding a replacement switch for this furnace?

- Help me find a new pessure switch!

Posted: Mon Nov 14, 2011 9:17 am
by heatseeker
If the parts are obsolete so is the furnace. Also the inducer draft motor could be your problem, Or you could have clogged flue pipe. Time for a new furnace> have you checked the heat exchanger?

- Help me find a new pessure switch!

Posted: Mon Nov 14, 2011 2:52 pm
by hr2pilot
Thanks, but the blower works fine, was replaced a few years ago, and blows adequate pressure through it's exhaust nipple.

The flue has been inspected and is clear. The heat exchanger has also been inspected with no leaks or cracks.

The switch is a simple single nozzle, .20 WC , so I should be able to find other brand online that should work.

Cheers

- Help me find a new pessure switch!

Posted: Tue Nov 15, 2011 8:59 am
by heatseeker
What do you mean the blower works fine? don't you mean the inducer motor works fine? A 20 year old unit needs replacing in this day and age.
cheers

- Help me find a new pessure switch!

Posted: Wed Nov 16, 2011 2:55 pm
by hr2pilot
OK...I give up......a new pressure switch installed still gives me intermittent operation. There is not enough pressure to keep the switch closed all the time.

Jumping the contacts on the switch gives me good furnace operation. Everything else checks out.

So, what you're saying is that although the inducer motor seems to be running ok, it may not be up to proper RPM to provide the required draft pressure?

Sounds reasonable......the motor is making a bit more noise these days.......looks like a new induced motor/blower assembly is needed.

This will be the second motor replaced in 21 years. I suppose I shouldn’t complain, these motors do work pretty hard in extreme conditions and proximity to heat.

Thanks

- Help me find a new pessure switch!

Posted: Thu Nov 17, 2011 8:42 am
by heatseeker
Yea new inducer motor, or new furnace your choice.

- Help me find a new pessure switch!

Posted: Thu Nov 17, 2011 12:24 pm
by hr2pilot
200 bucks versus 5000 bucks......decision won't be hard... -)

- Help me find a new pessure switch!

Posted: Mon Nov 21, 2011 9:15 am
by heatseeker
I don't know where you got your quote but 5 g's for a new furnace is way out of the ballpark.

- Help me find a new pessure switch!

Posted: Mon Dec 12, 2011 6:24 pm
by pacalis
h2pilot. Interesting, I had exactly this problem this week with the same furnace. And the same math.

Heatseaker - what would you think an install cost to upgrade a to a good high efficiency furnace in Canada. And what would you look at?

- Help me find a new pessure switch!

Posted: Tue Dec 13, 2011 8:48 am
by heatseeker
Well I don't know about canada-oh Canada- but for 80% gas equipment 1500 to 2250 is a pretty good ballpark. That's a straight change out. As far as the high efficient units of coarse the dollars go up. I personally like to keep it simple though, big technology can also mean big headaches.