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SAFETY WATER FLOAT SWITCH DOESN'T SHUT DOWN AIR HANDLER FAN

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12K views 12 replies 7 participants last post by  Bocatrip  
#1 ·
I have a Trane XR15 purchased in 2010 with air handler 4TEE3C05A1000AA built in 2009. The handler has a variable stage fan. I noticed that the float switch was not turning off either the outside compressor or the air handler fan. The original installer came by and changed the safety float switch as well as the air handler module and fan motor. Now the float switch will shut down the compressor but still does not shut the air handler fan as it continues to run regardless of how long we wait. Does anyone know if this particular trane unit is designed to only shut the compressor and not the air handler fan? Thanks all.
 
#3 ·
I never wire them up to shut off the fan, just the outdoor unit. That way, if drain clogged up in the winter, you would still have aux heat. And wouldn't need to call someone out at 2 AM for no heat due to a clogged drain. Not to mention it would protect your pipes from freezing.
 
#5 ·
It's all a matter of opinion, but I would rather have water damage from a condensing furnace than have pipes freeze and burst because the furnace shut down. There are pros and cons to both.
 
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#8 ·
It's fine. The switch is an aftermarket accessory that can be wired several different ways. As long as the compressor stops on a trip you're ok.
 
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#12 ·
As for the wiring of the safety, there may be a code issue. I have no idea in Fl, but in my jurisdiction they want the entire unit shut down!!! As I am in a region that does freeze, I think this is beyond stupid.
This being said, check your code and wire it accordingly.

Personally, I wire the safety to shut off the item in question. In your case it is the outdoor unit. It could be a humidifier or any other accessory.

As for the water, usually the water being produced is minimal like you think, but there is some residual moisture on the coil and/or in the pan that needs to drain. There could be a situation where the unit freezes up and then there is even more water as this thaws/defrosts.

Last thought/question, why is this now come up as an issue?
 
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#13 ·
Thanks PACNW. As for your question as to why is it now an issue after I had it installed 4 years ago.......I just happened to pull the safety float for no other reason than to see how it works only to find out it doesn't. In the 16 years I've owned my present home, I've never had any drainage issues as I am diligent in treating the lines with vinegar every month or so and when I park my car in the garage (location of air handler) I always check around the base of the handler for moisture. I'm pretty anal which explains my post.
 
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