wiring problems with new condensor fan motor

12:03 ______________________________________________________________________ we just purchased a new aosmith 1/3 hp fan motor. model F48B65A01, stock no. is FSE1038S. It has 4 wire hookup, black goes to contactor, it has yellow wire which we thought hooked up to the round capacitor that is labeled FAN. the problem we have is that when we hooked up the yellow wire to round capacitor where indicated, the fan did not work, so i called johnstone which is where we purchased the fan and they said that it gets hooked up to the common terminal not the fan terminal. we did that and the fan worked for approximately 10 minutes, then stopped, compressor was still running so we shut it down. there were also there are two brown wires, one that has white stripe, one that is solid brown. we have 2 capacitors. could anybody please help i have searched everywhere to try and find a wiring diagram but no luck. Replies: Xenos Webmaster “Re(1):wiring problems with new condensor fan ” , posted Mon 4 Aug 13:07 ______________________________________________________________________ The brown wires go to a capacitor, the one marked will go to the marked terminal on the capacitor. This Is a safety feature since if the capacitor was ever to ground it would most likely ground on the marked side. And if the capacitor feed wired is connected to this terminal, no motor damage will result. The marked terminal will either have a red dot or a dent on it. If one is not noted dont sweet it just put the 2 brown on the capacitor. With this kind of motor NO OTHER WIRES ARE TO BE ON THE CAPICATOR. Now just power up the other 2 wires. Xenos. The best way to escape a problem is to solve it. bsdidier “Re(2):wiring problems with new condensor fan” , posted Mon 4 Aug 13:16 ______________________________________________________________________ thank you for your quick response, but i am a little confused. we have one square capacitor i believe it is a 7.5 it has 2 terminals, could you tell me which wires go on it. we also have a round capacitor with 3 terminals. one is labeled herm, one is labeled fan other is labeled common, could you tell me which wires go there. i just want to make sure i do it right this time, do not want to burn up new motor. thanks again Xenos Webmaster “Re(3):wiring problems with new condensor fan” , posted Mon 4 Aug 13:55 ______________________________________________________________________ Obviously there is a slight difference in this motor compared to the last one. Your last motor most likely only had 3 wires and now this on has 4. The capacitor you have with 3 terminals is called a duel capacitor it has 2 capacitors in it. For this motor lets just altogether skip this one. Just use it for the compressor. Now this other one the 7.5 uf two terminal capacitor, Look on it and see if there is a marking of some sort near one of its terminals, it could be a dab of paint or a dimple or bump. The brown with a white stripe will go on this terminal, the solid brown on the other. Black to the contactor and the last wire to common witch may just be a terminal on the duel capacitor just make sure its the opposite power wire than the black wire. Xenos. The best way to escape a problem is to solve it. bsdidier “Re(4):wiring problems with new condensor fan” , posted Mon 4 Aug 14:39 ______________________________________________________________________ well the 7.5 capacitor had no markings or dents on it. the left terminal on this capacitor has 2 black with blue stripe wires on it. these two wires did not come from the fan, not sure where they come from. but did not move those. anyways, i put the solid brown wire on that side, and the brown wire with stripe on the other terminal which would be the right side. now the other wire which is yellow i hooked up to common terminal on the other capacitor which has 3 terminals. also on that capacitor is on the herm side there is a red wire, and a skinny orange wire. and also one fat orange wire on the common side which is same side as i put the yellow fan wire. does this sound right, i hope so, cause man it is gettin hot here in tennessee. sure do appreciate all the help you have given so far. if this all sounds right to you i will attempt to switch power on, thanks again Xenos Webmaster “Re(5):wiring problems with new condensor fan” , posted Mon 4 Aug 16:14 ______________________________________________________________________ Ok just received my call back, according to a A.O. Smith rep for 3 wire operation connect the black wire to L1. The brown and white wire to common on the common side of the capacitor and the full brown to the other side of the capacitor with no other wire should be connected on this side. And the last wire just tape it off as its not required. So if your 3 terminal capacitor is 7.5 uf Connect the brown and white wire to the common terminal and the brown wire to fan side. Black to the contactor and tape off the remaining wire. Once its running check the current to verify that the fan blade is placed properly in the housing, If it grabbing to much air the motor may be working too hard. Xenos. The best way to escape a problem is to solve it. Xenos Webmaster “Re(5):wiring problems with new condensor fan” , posted Mon 4 Aug 15:48: ______________________________________________________________________ For flexibility the motor you have is a four wire configuration. I have always just wired it for 4 wire as I always replace the capacitor at the same time. The capacitor is like 5 bucks. Anyway the reason I am mentioning this is I believe the brown wire may be the same wire as the power one. You could verify this with a meter. If it is then and if the 3 terminal capacitor is a 7.5 uf then the solid brown wire would go on the bare terminal and the brown and white would connect to the same terminal as the common wire. I have a phone call in now verifying this and will get back to you as soon as I find out. Xenos. The best way to escape a problem is to solve it. [this message was edited by Xenos on Mon 4 Aug 16:02] Xenos Webmaster “Re(5):wiring problems with new condensor fan” , posted Mon 4 Aug 15:16 ______________________________________________________________________ Ok now you have me confused. You cannot have any other wires on the capacitor other than the brown motor wires. Only connect the brown wires to the capacitor for this motor, Since all motors are different wiring and capacitor ratings are listed on the motor label what capacitor did you get with the motor? or is the old one the right one ?. Every motor requires a capacitor so far you have told me you have 1 duel capacitor for the compressor and old fan and this 7.5 one thats technically 3. Are all 3 being used? Do you have 3 motors ? Where did the last motor connect? The 3 terminals one? And whats the 7.5 uf powering ?. This should be really simple 1 compressor with a capacitor and 1 fan motor with a capacitor. Now lets just look at a full picture for a moment. 2 power wires enter the unit. One lets call it black and L1. The second lets call it white or L2. Both of these wires will go to a contactor. Now off the contactor we will power L1 to one of the fan motor wires and one compressor wire. L2 will power Common on the 3 terminal capacitor and the common wire on your new Motor. The 2 remaining wires on the compressor will connect to the 3 terminal capacitor and the last terminal on the capacitor will be bare, this bare terminal could be used with a 3-wire fan motor but not a 4. Now this new motor requires its own 2 pin contactor and will connect to the 2 brown wires. What is the make and model of the unit you are working on ? I may have access to a wiring diagram. Xenos. The best way to escape a problem is to solve it. bsdidier “Re(6):wiring problems with new condensor fan” , posted Mon 4 Aug 16:13 ______________________________________________________________________ i apologize for the delay, but here is make and model number. TRANE EXECUTIVE HIGH EFFICIENCY MODEL# BTD742A100B0. I also apologize for the confusion. I have 2 capacitors, the small 2 terminal capacitor is the 7.5 and the round 3 terminal capacitor which is marked with herm, common, and fan. the new fan motor is a four wire hookup. the black we connected to the contactor which is where the black one on old motor was at. the yellow wire is now connected to the round 3 terminal capacitor on the common terminal. the two brown wires are connected to the small 2 terminal capacitor one on each side. as far as the orange, red, and the blue striped wires go, we put those back exactly where they were at before since we assumed that those were the compressor wires. and we did nothing to those. thanks again!!!! Xenos Webmaster “Re(7):wiring problems with new condensor fan” , posted Mon 4 Aug 16:31 ______________________________________________________________________ This sounds right as long as there are no other other wires on the 7.5 uf capacitor. Xenos. The best way to escape a problem is to solve it. bsdidier “Re(8):wiring problems with new condensor fan” , posted Tue 5 Aug 16:34 ______________________________________________________________________ well, we flipped the switch on after double checking wires, and the fan ran for about 15 seconds on a hard speed, then ran about 20 min. on a slow speed which it has never done before. then smoke started coming from bottom of the fan motor. not sure what to do now. Xenos Webmaster “Re(9):wiring problems with new condensor fan” , posted Tue 5 Aug 23:20 ______________________________________________________________________ “This sounds right as long as there are no other other wires on the 7.5 uf capacitor.” Sounds like there was another wire on the capicator Xenos. The best way to escape a problem is to solve it.

Comments are closed.