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Old 04-20-2017, 07:46 PM   #1
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evaporator coil plenum


The threaded fitting from my internal drain pan has rusted out so I need to replace it. I'm not sure what type of connections the discharge plenum and coil plenum have as it is all covered with mastic. I'm guessing it is not the slip and drive connections, would it be those push together type? The mastic is pretty thick but I don't see any screws.
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Old 04-20-2017, 08:02 PM   #2
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Re: evaporator coil plenum


Actually maybe there are screws on closer look.
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Old 04-21-2017, 07:20 AM   #3
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Re: evaporator coil plenum


It's hard to tell what's going on there. That mastic is terrible. Maybe some pics further away would help.
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Old 04-24-2017, 08:20 PM   #4
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Re: evaporator coil plenum


Sorry, life got in the way. More pics attached. I put the black caulk around the drain connections but it did not help, you can see it is likely just filling pan inside and dripping into plenum and exterior tray. HVAC guy told me that if its taken apart the coil will need to be replaced because its old and will likely get damaged and therefore condenser needs to be replaced also. It's true it is old, but I read this is a pretty common statement by some repairmen. I'd like to at least see if I can replace pan. At very least if I open it up I've cut out an hour or so of labor.
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Old 04-25-2017, 11:24 AM   #5
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Re: evaporator coil plenum


Can you cut the insulation on the drain pipe back so we can see what's there ? Normally the pan will have a PVC fitting on it.
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Old 04-25-2017, 06:41 PM   #6
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Re: evaporator coil plenum


There must have been a steel nipple in it because it was completely rusted. I did not think about the pan on female being plastic, I will have to try cleaning that out. Currently I siliconed it all together so peeling back insulation wont show you anything.

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