Electrical short diagnostics Low volt transformer breaker is tripping instantly Install replacement transformer 75 VA 240vac Install replacement 35 UF compressor capacitor. Old at 29uf Trace electrical short to the red 20\2 wire in series with a transformer low voltage feed Remove integrated smoke detector shutdown wire that was in series with the R (hot) wire of the transformer. Run test equipment in cooling mode If equipment continues to run correctly and smoke detector company confirms a correct repair or a real breakdown, the transformer installed today can be swapped out for the original that is still on site in place at the next regular maintenance service *** Currently HP4 is running with no smoke detector shutdown and is a safety concern if there is a fire in the building Recommend addressing the repairs with the smoke detector company ASAP***