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Inspecting HVAC Systems Topics include heating, venting, and air conditioning inspections.

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  #1  
Old 10/5/12, 2:22 PM
wchandler wchandler is offline
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Default AC reset question

What generally is the problem when the AC does not restart when you simulate an overflow by removing the switch and of course then replacing it? Thanks for any info.




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  #2  
Old 10/5/12, 2:32 PM
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David A. Andersen David A. Andersen is offline
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Default Re: AC reset question

what are you talking about?

Are you testing the overflow pan switch?

Many units will not come right back on when you interrupt control circuit power. They timeout to allow equalization of refrigerant pressures.

If it never came back on, you did something wrong when you "reinstalled the switch"…

Why are you dismantling anything?



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  #3  
Old 10/5/12, 2:37 PM
John Ritter John Ritter is online now
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Default Re: AC reset question

if it is a mechanical float switch and you inverted it,it may be stuck
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  #4  
Old 10/5/12, 4:10 PM
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Bruce A. King Bruce A. King is offline
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Default Re: AC reset question

Quote:
Originally Posted by wchandler View Post
What generally is the problem when the AC does not restart when you simulate an overflow by removing the switch and of course then replacing it? Thanks for any info.

Did the t-stat display power back up?
Or, if it has no display, can you hear the relays in the t-stat click when you change modes?

When you interrupt the control voltage and reenergize it, it causes a slight surge that can blow a weak fuse in the air handler. Yes, fuses get weak, its called metal fatigue. Some blown fuses are simply "bad fuses" with absolutely no cause other than age. Air handler fuses are typically 3 to 5 amps and often use one of the common types of automotive fuses.



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  #5  
Old 10/6/12, 2:50 AM
wchandler wchandler is offline
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Default Re: AC reset question

Thanks, Bruce. That's what it was. the t-stat did not display, replaced the fuse and it powered up. Adding fuses to my inventory now.

FYI David Anderson: I check the pan overflow switch as a part of my inspection - don't you? It's a simple and important thing to do and when the unit shuts down, it's easier to remove the AHU door panel to check the A coil - you check the A coil don't you?




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  #6  
Old 10/6/12, 8:16 PM
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David A. Andersen David A. Andersen is offline
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Default Re: AC reset question

Quote:
and of course then replacing it?
So what's with this comment?

What do you have to 'replace'?

I know your used to have compliance with the Florida only group, but you don't have to show what a flaming *** you can be...



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http://www.midtninspections.com
ITC Level III Thermographer Cert#1958
Building Science Thermographer Cert#33784
http://www.thermalimagingscan.com
HVAC Certification EPA Cert#2046620
BPI# 5015804
Link to my Website at: http://www.midtninspections.com/link-submission
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