Question about Heating & Cooling
I have a wiring diagram for an air conditioning unit. On the diagram the run capacitors indicate that a "red dot" on the capacitors indicates which corresponding colored wire attaches there. However, the capacitors are rusted (an outside air conditioning unit) and no "red dot" can be seen on either capacitor nor any other indication of polarity. I can make out that the capacitors are rated at 370VAC. That being the case, AC vs. DC, can I not use non-polarized 370VAC capacitors with correct uF for replacement? Thanx.
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Posted on Jan 02, 2017
Polar refers to polarity. When dealing with the power you have to use color coded wire usually red, black, and white. This is so you don't incorrectly hook it up and cause a short. On the control it does not matter if you use coded wire. It is just to complete a 2 wire sine circuit for a thermostat. Hope that helps.
Posted on Jul 01, 2009
Hi, if the first 35 uf run cap shorted, you most likely have a shorted to ground compressor. This is what causes them to burn out.A 35uf, x 440 volt run cap is for the compressor only. You should or will have a smaller one for the out door fan.1 lead from the contactor feeds one side of the capacitor, energizes it. The S wire also plugs into that same terminal. Then the R or run wire from the compressor, and C will go to the other side to start it. The 2 left ove have to be commons to feed other componants, you will need to follow them to see, as I can't pull up any diagram for that model. You need to have the compressor ohmed out, or checked to see if it is shorted to ground. To do this, remove the 3 wires to the compressor terminal. Make sure the power is off! If you have a voltage tester that has the audio alert for checking fuses and so on, touch the black lead to a clean spot on the compressor of copper line, and tough each one to each terminal. If you get a beep, it is shored to ground, and you will need to replace your compressor. Do this check and let me know.
A/C, & Heating contractor
Posted on Jun 06, 2011
Your new fan motor should have a diagram with it or at least printed on the side of the motor, that will help a lot from your end. As for me, I don't know what unit you have, so I will try to help you with just the basics.
Your old motor probably had 3 wires. One went to the contactor, that is the "Line Voltage", one went to the Common terminal on the old capacitor (COM), that's the other "Line Voltage" wire, and the last one went to the "FAN" terminal on the old capacitor. The reason the old capacitor looks different is because it works for both the compressor and the fan motor (split capacitor). You still need this hooked up for the compressor to work.
The new fan motor.
These vary in brands and wiring so I can not tell you the colors without knowing exactly which motor you have. On the new motor wiring diagram, you should see the "Line Voltage" as described above that 2 of the wires are ran to each other (just on the diagram, not wired together on the unit). This is your power wire that goes to the contactor on the unit, usually black, and your Common wire that runs to the capacitor. You can still run this wire (COM) to the common terminal on the old capacitor since you still have to use the old capacitor for the compressor and the common terminal should still be jumper-ed from the contactor to the (COM) terminal. Then you will probably have 2 wires for the new capacitor, usually Brown and Brown/White. These wires run to each side of the new capacitor and doesn't matter which terminal. Then you will take a new jumper wire from the (COM) terminal on the old capacitor to the terminal on the new capacitor that has your Brown/White lead. Make sure you secure the capacitors inside the unit so not to touch anything surrounding them. Your new motor might also be a "Reversible" motor that has reversing wires also. Again, your new motor diagram can tell you how to hook these up. You have to have it spinning the right way, most of the time it is CCW (counter-clockwise).
I'm sorry I can't be any clearer on this, but without knowing the brands, models, etc, I'm in the dark. If you need any additional help, I would be glad to help! Good luck and hope you get to cooler days!
Posted on Jun 29, 2012
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