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Sep 21 '17 at 10:56 comment added d.george His unit may have been engineered for an 825 RPM motor. I do not know what your fans RPM should be. You could check with the MFG. to see what the RPM should be. In your case someone may have installed the 1075 motor by mistake. I would ask someone who can give you reliable information.
Sep 9 '17 at 20:38 comment added user56530 My neighbor has been running a 1/5 HP at 825 RPM motor, so I think it will be good.
Sep 9 '17 at 9:38 comment added d.george The 825 RPM may be too slow to provide the needed air flow for the condensing unit during peak operating conditions. Not enough air flow will result in the high side refrigerant pressure exceeding it's rated limits. This will also cause a greatly reduced operating efficiency. I have been retired for 10+ years but I do not think that things have changed that much in the industry except for the types of refrigerant used. I was weaned on R-12, R-22, ans R-500. To get the rated air flow you will need the original RPM of 1075. Hopefully, the younger people will also share their comments.
Sep 9 '17 at 1:46 comment added user56530 Turns out the 1/6 HP motor was too weak. I replaced it with a 1/3 HP motor which is running flawlessly (50 + 5 μF cap instead of 50 + 3 cap μF).
Sep 7 '17 at 20:32 comment added user56530 d.george-Sounds reasonable. I did buy another motor, this time 1/3 HP, 825 RPM. We'll see what happens when it gets here.
Sep 7 '17 at 16:20 comment added d.george Years ago when we replaced motors on fans and the like we would increase the horse power i step. When replacing small motors we would assume that the newer motors were made slightly cheaper and provided less power, which many times turned out to be true. By increasing the motor HP. we would always have a satisfied customer on the first call.
Sep 5 '17 at 19:55 comment added user56530 The condenser and compressor are both outside. I have no means to check amperage; I don't have an ammeter clamp. The motors are indeed same HP, but different amperage (new rated .73 A; old rated 1.2 A). I had made another thread on this a week or so ago (but it was about selecting the proper capacitor). RPM is theoretically the same (1075 RPM). I don't know how to determine actual RPM. I did not check input voltage. I will read up on that.
Sep 5 '17 at 19:49 history answered d.george CC BY-SA 3.0