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Old 12-18-2010, 09:26 PM   #1
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This cold snap has us pros running....


...as have I.

I have been seeing a lot of lockouts on 90% furnaces that have clean filters but the secondary heat exchanger had noticeable build up in the fins. These are first time referred customers who have been doing business with another company for years, but the company could not get to them until the following day. With this cold snap these customers could not wait so I get the call.

I just want to pass on to our DIY friends with 90% furnaces to make sure your service company cleans the secondary exchanger during your annual inspection and cleaning. During mild winter weather your furnace may just shut off once or twice a day and you would not notice it.

But with this deep freeze we have been getting around here, in my area, and other parts of the nation, your furnace is going to run longer and harder and over heat multiple times and will go into lock out and stop working.

When I do an annual cleaning for my customers I always pull the blower motor and vacuum/blow the dirt from between the secondary ht ex fins.

Evidently the new customers I serviced this past week are going to have some long talks with the last hvac servicer that did this years cleanings for them.


I hope this is helpful to DIYs (and maybe our younger pros too.) who do their own cleaning or have it done professionally.

Peace-Love-And Rock And Roll!

Merry Christmas
Happy New Year.

Clover Actual

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Last edited by hvaclover; 12-18-2010 at 09:29 PM.
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Old 12-18-2010, 09:50 PM   #2
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This cold snap has us pros running....


Thanks for the head's up. My system is only 2 years old, with an electronic cleaner, but I will check it out on Monday, when I change out my blower motor.
The thing decided to burn up on me this morning at about 4am. Still can't get the stink out of my nose!
Not sure what happened exactly, but the filters are clean, voltage meters fine, unit is grounded, and everything is wired correctly.
Oh well...

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Old 12-18-2010, 10:07 PM   #3
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This cold snap has us pros running....


Two years only?

Dang...at least it's warranty since it's so new.
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Old 12-18-2010, 10:14 PM   #4
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Yeah, but not sure how long to get a new replacement. But, at least I will have a new one I purchased sitting on my desk Monday morning. I'll get the warranty replacement eventually, and keep it as a spare.
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Old 12-21-2010, 06:27 PM   #5
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This cold snap has us pros running....


Got the new motor in and running great.
What is your thoughts on the DC Brushless ECM Retrofit motors (Emerson Rescue EcoTech, Evergreen Genteq, etc). I like the thought of a low speed circulating mode (600 RPM), and a soft ramp up to speed for heat or cool. That plus the energy savings makes it interesting. Especially considering I can get a Genteq for only $200 more than the PSC I just got.
Thanks.

BTW... sorry to hijack the thread. Could start a new one if needed.
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Old 12-21-2010, 06:36 PM   #6
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i think ecm motors are good. They deliver much more comfort than a PSC can.

My only objection is the price.
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Old 12-21-2010, 06:45 PM   #7
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The retrofit ones operate quite differently than the factory OEM ones. The retrofits do not have soft ramp up and are not variable speed like the OEM infinite speed variable speed ECM ones that come with new furnaces. Those are computer controlled by a programmed circuit board. Retrofits have 4 speeds like a PSC but are DC and more energy efficient.
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Old 12-21-2010, 07:00 PM   #8
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Found that out when my supplier introduced our new product line some years back. Thought it was weird getting DC motors in new equipment. Flet like a step back in history before the discovery of of AC current.

But ECM VS motors on new equipment was what I was referring to in my previous post.
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Old 12-22-2010, 10:48 AM   #9
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This cold snap has us pros running....


Just so I am clear, you are recommending careful cleaning of the outside of the secondary exchanger and, not, the inside where the combustion gases pass through. Is that correct?

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