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Hi -- I just spent a couple of days taking out the old assembly, cleaning all the parts (layers of dust coats) and putting the 9093N back in order to fix the noisy fan. The cold air coming back in is from to the heating and I'd guess the heating element is busted. Yes, you can run it in both airflow modes: ceiling air exhaust and hot air blown to the floor. That said, the noise level on mine hasn't gone down. So I'll look for the replacement assembly. Good luck!
The replacement motor is available from several sources online. The best way is to purchase the new motor assembly. All you need to do is remove the blower housing from the ceiling, there are three screws that hold the motor assembly in place. The whole job takes about five minutes.
Here are a few sites with the motor.
I had the LS-80SE and it appears that that model is discontinued, including the replacement motor. I ended up replacing it with the QTN110E, which is a bit bigger. The QTN is designed to mount to a joist on the opposite side of the LS model, I avoided having to do that by just screwing through the metal body into the joist that the LS was mounted to instead of using the mounting holes that are provided on the QTN. You will end up having to remove a small amount of drywall approx 1"x 11.5" to fit the QTN in. Put a backing strip or piece of plywood up and behind the drywall so that you have something to screw the filler piece of drywall in to when you do your repair, mud the cracks, sand, texture if need be... hope that helps
The grille is held in place by the reflector. The reflector is hidden by the the lens. The first step is to remove the lens, then you will remove the light bulb. You will see one wing nut above the light socket. If you unscrew that the reflector and the grille should come down. The replacement motor assembly for the 763 RLN is the S0503B000, if you are looking for a little more power you could also purchase the S0504B000
The good news is that this is a relatively easy item to remove and replace, as they make a replacement fan/motor unit (sub assembly) that you can swap out for the old one.
All you need to do is pull down on the trim vent plate and then squeeze the wire retainer clips together to remove the grill/trim.
Once you've done that, you can unplug the fan portion of the exhaust fan unit from the base enclosure. Now simply remove the screw or nut that holds the fan and mounting plate into the enclosure and simply pull it down and pivot it out of the enclosure - you might have to push in on the side of the enclosure where you removed the screw/nut to get the fan and metal plate out of the cabinet.
The replacement fans usually come with a new metal mounting plate that fits many of the older exhaust fans, but if your's looks different or doesn't work, you can remove the fan and install just the fan motore onto your old metal fan mounting plate.
Instructions are typically included in the replacement unit packages. This is also very simple to do with only 2 screws holding the fan onto the mounting plate.
Once you're done, simply hook the edge of the plate back into the fan enclosure and then push it up and fasten the mounting screw/nut onto the plate and plug the fan into the ceiling enclosure and replace the grill plate and you're all set!
First turn the power to the fan OFF. Take it down from the ceiling by removing the screws holding the cover on. Then remove the screws holding it to the ceiling. Then unscrew the screw caps that twist (connect) the wires from fan motor to the house wiring. Do a general clean up on the fan. Use an old paint brush to get in the hard to get at places. Rotate the fan by hand. If it does not rotate freely, put some oil on the shaft where it goes into the motor, and put some on where the shaft comes out the back. If it still does not rotate freely, buy a replacement and install it.