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Old 02-11-2011, 01:44 PM   #1
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Ducane furnace part number needed


I have a Ducane CMPA075U3 furnace. The flame roll out sensor tripped this morning. As I was resetting it, I accidentally bumped the small tube that connects from one of the pressure sensors to the heat exchanger plate. Upon closer inspection, I realized there was a small plastic adapter that interfaced between the heat exchanger nozzle and the rubber tube. It had become very brittle from years of heating and crumbled to pieces. The tube is too small to fit on the heat exchanger's nozzle/port, and would probably melt anyway. Can anyone provide a part number of the original piece, or even a solution that might work satisfactorily?
thanks
Mike

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Old 02-11-2011, 07:30 PM   #2
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Ducane furnace part number needed


Before you buy any parts find out why the flame roll out switch tripped. Plugged flue or cracked heat exchanger would be the place to start looking.

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Old 02-11-2011, 10:52 PM   #3
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Ducane furnace part number needed


Yeah but before he corrects the roll out he has to fix the nipple first for the furnace to run.

The right way is to change the plastic cover the broken nipple id molded to.

The other way is to drill out the broken nipple the same size as the nipple.
Insert a (just an example...your nipple could be larger)1/4" barb by 1/4" male thread Or a barb fitting the same ID as your sensing tube. The tubing could be 1/4/", 5/16", or 3/8' barb fitting.



(new pressure switch and tubing)

A good guide is use the old tubing and pressure switch. Buy a barb fitting that the pressure switch tubing will fit over tightly
Drill the hole and use RTV silicone to glue it in place.
If you need longer tubing just get regular clear vinyl tubing from your local hardware.

The burners are enclose so the heat won affect it.

Than find out why you roll out switch tripped.
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Old 02-12-2011, 10:38 AM   #4
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Ducane furnace part number needed


Marty, the intake has a mesh screen (to keep critters out?). The temp dropped into the single digits the other night and the screen became clogged with ice. Could that have caused the roll out switch to trip?
hvaclover, I like the idea of the barb fitting, although I don't think I'll find one to match the size on my heater. Today, there exists a small metal stud, about 1/4 inch diameter, mounted on the center of the heat exchanger plate (see photo). A 12-24 machine screw will screw into it. Is it possible this fitting is screwed into the plate? I am tempted to try to turn it with pliers.
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Old 02-12-2011, 01:52 PM   #5
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Ducane furnace part number needed


From the parts breakdown, that small nipple that extends out from the collector box appears to be part of that box and not a separate piece.

The part is a 20275301 FLUE BOX COLLECTOR. It appears to be the complete Flue box with the protrusion for the attachment of the tubing.

Good Luck
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Old 02-12-2011, 03:15 PM   #6
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OOOOuuooooooo that's made of metal....my bad. thought it was plastic.
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Old 02-12-2011, 07:33 PM   #7
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Home Air Direct - the small nipple that extends out from the collector box is too large to accept the 1/8 inch ID tube. There is (was) a small plastic adapter that fit snugly on the nipple and fit into the end of the tube. Is that part shown?
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Old 02-13-2011, 02:54 AM   #8
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Quote:
Originally Posted by mmcgirr View Post
Home Air Direct - the small nipple that extends out from the collector box is too large to accept the 1/8 inch ID tube. There is (was) a small plastic adapter that fit snugly on the nipple and fit into the end of the tube. Is that part shown?
so buy some furnace tubing the same id and hose clamp it.
Or get some high temp plastic connectors. It's no big deal/

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