I have this air conditioning unit where suddenly stops functioning and no power on the indicator. i have thecked the breaker and it is fine and ON with a three phase supply. I've checked the condenser at...
Hi, I will see if I can give you some idea of what may be happening. I work on these on a day to day basis. So, you have a split system with the condensing unit on the roof, or a package unit on the roof? Sounds to me it is the first one.So, you are telling me that the power supply at breaker below is OK, but you should have a power box at the condenser on the roof. When you reset power to the condenser, that's when you here this blast sound? To me from just hearing what you are saying , it would be the sound of the compressor trying to start up, and it has a internal problem making this noise. Tell me, when it makes this noise, does it trip the breaker again? If so, it is definatley the compressor. You can prove this if you are inclined to do this, is to find the 3 different wires going to compressor, and make sure power is off 1st. Disconnect them at the Contactor or remove the plastc cover from compressor and write down which wire goes to each terminal.Tape the ends so they dont touch metal. Turn the condenser back on and see if this blast is gone. If so, the compressor is dead and you will need a new one.You say you have 3 phase power? This is unusuall for a residential unit, 3 phase units are for comercial unit power. They dont use starting componants like Run or start caps because they have enough power to do the job.3 phase would have 3 hot legs of equal voltage unless it was the older 3 phase which will have a stinger leg with higher voltage then the 2 other legs.Maybe this is a commercial a/c. Also, the compressor is reversable on a 3 phase unit by moving 2 of the 3 wires on the load side of the box, like T-2 and T-3. If these are switched if the compressor is locked up, sometimes you can get lucky and break it loose.Please don't do this, I am just explaining to you a little about 3 phase. Try this so you can elimanate the compressor. The only other thing it could be, if this is a gas pack and you are starting the heat, you can be getting blow back premature combustion? But I don't think this is what you have. It has to be the compressor.So, lets prove it by taking it out of the circuit. all should hold and no noise.Still, a faulty compressor is not a good thing. Let me no. Best of Luck and safety first.
Nov 25, 2009 |