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Detecting a leak
What is the most economical way to detect a slow leak.
I have a 1.5 ton split system with condensing unit on the roof.
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Bubble soap, the coil and connections..
'Life begins with the journey each day'
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is that a joke ?
I don't think so, not for a very slow leak, what is meant by coil the connections
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I'd recommend calling a hvac contractor & get him to use his electronic leak detector. It looks something like this.

He's gonna charge you a service call & a fee for finding your leak. Sometimes they'll let that go towards the repair if its something like a evaporator. Just depends. If I were you I wouldnt even bother finding it, unless your planning on spending the money to have it fixed.
Life is like a jar of jalapenos. What you do today might burn your ass tomorrow.
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Call a contractor, they will come out check electronically and with bubbles. They may need to boost the pressure in the system with nitrogen. And as hvachero indicated, if the leak is in a coil it likely will be unrepairable and the coil will have to be replaced.
S**t or get off the pot!
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bubbles detect gross| large| bad leaks.
small leaks by gas detection instruments, tuned for the specific gas.
harvest rainwater,make SHADE,R75/50/30= roof/wall/floor, use HVAC mastic,caulk all wall seams!
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 Originally Posted by summerblues
What is the most economical way to detect a slow leak.
I have a 1.5 ton split system with condensing unit on the roof.
Have you applied for professional membership yet? I highly recommend it. You'll get some more detailed answers to many of the questions you've been posting.
Perhaps you should have read the instructions before calling. 
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look for oil spot
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