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Old 09-05-2012, 11:26 AM   #1
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3Qs -Drop Main Return, Backup Drain, Coil Cleaning


Hey Gang-

I would really appreciate your help with my three questions:

Q1. I am trying to plan out my mastic duct-sealing project. There are 4four 6" branches off the main supply duct but I cannot get to them because the main return is in the way. I cannot get to them from the opposite side because the main beam is in the way. How easy or difficult would it be for 1 person to temporarily drop and re-install the main return (approx. 20 feet) in sections? Any tips or special tools?





Q2: I just noticed that my AC backup drain has been plugged? Shouldn't this outlet be attached to a PVC to dump water on the ground in case the primary drain is plugged up? Since I will not be able to install a floor pan, can I point my new secondary pipe into a small bucket. Should I install a water detection switch? How difficult would it be to install such switch and tie into the system?



Q3: I am not sure when was the last time my coil was cleaned. Can someone tell me if the cover (pictured) contains the coil inside and that I simply need to remove the sheet metal screws, take the cover off and clean my coil? Any special cleaning chemicals I should use?


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Old 09-05-2012, 12:08 PM   #2
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3Qs -Drop Main Return, Backup Drain, Coil Cleaning


1.) I'd have two people present. Removing those cleats is the correct way.

2.) Easy to install an evaporator float switch into the secondary drain line. It simply screws into where that plug is right now and you connect the two wires from it to one of the wires going to the condenser, putting the switch in line of that one wire. All power by way of breaker, not just the stat, must be off or you can blow a fuse or transformer.

3.) Yes. There are a few screws on the inside that hold the drain pan in place. You'd first need to remove that exhaust pipe out of the way, then the service doors of the coil, remove the inside screws that hold the guts in place and VERY CAREFULLY pull the entire thing out. Carefully so as to not bend the refrigerant lines.

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Old 09-05-2012, 12:09 PM   #3
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Old 09-05-2012, 12:11 PM   #4
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3Qs -Drop Main Return, Backup Drain, Coil Cleaning


This is what your upflow evaporator coil will look like.

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Old 09-05-2012, 12:14 PM   #5
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3Qs -Drop Main Return, Backup Drain, Coil Cleaning


Thanks Doc for the pictures!

I will post a follow up with some pictures.
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Old 09-05-2012, 12:21 PM   #6
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Not a problem.
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Old 09-05-2012, 12:35 PM   #7
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3Qs -Drop Main Return, Backup Drain, Coil Cleaning


Also, you're going to need to cut that main drain. I'd cut it after those first two 90 degree turns where there's a few inches of regular pvc pipe on the side of the evaporator so you can reconnect it with a coupling and some glue. You need at least an inch of pvc to stick into the new coupling on each side.

Good luck.

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