HVAC will not function properly. Need help to diagnose.
I have an HVAC system installed in the house I live in. It hasn't functioned in the two years that I have lived here and would really like to lose the window units that I have now. I replaced the thermostat and wired it exactly as the previous thermostat was installed. The blower fan comes on when I switch the thermostat to cool, but the air never gets cold. The condenser fan outside never comes on and I never hear a compressor pump turn on either. All power breakers are flipped to on position and are not tripped. I have tested the coolant bleed valve and coolant sprays out. I have opened the outside panel on the condenser and found nothing to look damaged or burnt out. Due to lack of knowledge, that was the extent of the examination on the condenser and I replaced the access panel. Where should I look next?
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Well, I spent some more time this morning after doing some reading last night and I think I have narrowed it down to 1 of 3 options. I was able to get the compressor and fan to run when I found a test button on the contactor. It successfully started cooling the inside while I press the button in. I used a multimeter and tested all the connections and found that my 24v 40amp wires were not producing any power inside or out. So I disconnected power, used a wire brush and cleaning alcohol and polished all the terminals. I used sand paper to remove the corrosion on the copper wires and replaced them all one at a time to ensure they were properly hooked again. Still nothing from the 24v wire. So, my conclusion after what I read is I either have A) A bad transformer that needs to be replaced. B) A bad contactor that needs to be replaced. C) My refrigerant is lower that I think and a low coolant level switch has shut the circuit from running the machine.
из Kelly Louwers
I guess my next question is, how do I test the transformer? Most likely I will leave it to a professional now that I know one of my friends husbands is a commercial HVAC certified tech. I would still like to know though if there is a way for me to check or if I need certain tools to continue forward with this endeavor.
I also appreciate everyone's comments and helping to make this a great site to come to!
из Kelly Louwers