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Your 3 phase unit should not have a capacitor. I'm guessing it's single phase. If it's a single capacitor than the compressor should not be going to it also. To test the motor, common to start plus common to run should equal the ohms you get between start and run. For instance, 1.2 ohms+ 2.2 ohms= 3.4 ohms. Follow the wiring diagram on the inside of the door, send model number!!
If you're talking about the high voltage wiring, the answer could be yes if it is a 3 phase unit. That means you have 3 separate legs of "hot". Many rooftop units are 230v 3 phase in the US. Single phase would have two hot wires and a ground. Look in the disconnect box. If there are 3 fuses you have a 3 phase unit. If you have 2 fuses, you have a single phase unit. Be careful, you are dealing with very high voltage and very dangerous.
What is the type (input, output, power) of the rectifier.
If controllable - may be the control PCB or thyristor. If not controllable - 10 V DC instead of 230 V DC is hardly believable. In this case the rectifier may be OK, but the input - low. If you have a voltmeter, check the input AC and the output DC if the output has about 200 V AC you may have shortened diode.
You cannot do this... 3 phase and single phase cannot be inter used... see 3 phase is 440 V AC, single phase is 230 Vots AC. This is unless the unit has Dual capability, in this case the wiring could only be wired to a Single Phase. of the unit. You will need a slow blow breaker of the correct rating and also the cable must be similarly CURRENT rated.
If it IS only 3 phase, you can purchase after market single phase to 3 phase converters, that will allow you to plug the 3 phase into a single phase circuit and work, they quite costly though.
It is indeed possible to use ONE Phase to run a motor, You simply use One Phase and Neutral. BUT ONLY if the 3 phase is Double, more or less, the required usage Voltage, EG: 440 3 phase, will be OK, for 220 single phase, . But 220 3 Phase,will not run a 240. single Phase. So in your case is suspect not, it really will do no harm to try though. it just wouldn't work, if not enough "juice", be careful.
http://en.wikipedia.org/wiki/Three-phase_electric_power
please 200- 240 volts is a standard for all and for the breaker is depending of the country if 120 v single phase you will install as usa if 220 v single also you can connect you breaker but the problem is some countries are not 50 hz comfirm the unit is 50/60 hz.
Sounds like you have a bad capacitor for your squirrel cage fan , now as for the a/c unit sounds like you have a direct short in compressor to ground or leg to leg , check all wiring to make sure that it is not grounding out or melted together.
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