Having a control circuit issue Carrier 48TME006-A-501. 208/230 3p. Blower runs fine but when terminal Y is energized the contactor chatters like mad with the compressor jumping all over trying to start. Easy right, I install a new contactor. BUT, same results.
I start searching for a loose or corroded 24v control circuit connection. not finding anything. I check both the LP & HP cut out switches for continuity. Both good but for the good measure I temporary remove both switches from the circuit and test. Still, heavy chattering of contactor. I check actual voltage at the contactor coil, 23.8v. Little low, I notice the control transformer is wired for 240. My service is 208 3p.
With the fluke hooked up to the contactor coil and I energize Y, I see my meter voltage reading dropping out. Can I have a bad control transformer? It is able to send 24v to G for the blower but craps out when asked to send 24v to Y & G?
I think so, will pick up a new 40va control trans in the morning. Is there anything I could be missing? Thanks