🔧 DIY AC Troubleshooting Story – TRANE 3-Phase Units скачать в хорошем качестве

🔧 DIY AC Troubleshooting Story – TRANE 3-Phase Units

🔧 DIY AC Troubleshooting Story – TRANE 3-Phase Units I was called to inspect a 3-ton TRANE 3-phase AC that had a very loud noise at compressor startup. Not a normal startup hum — it sounded rough, like a crank or mechanical knock 😬 🧐 Initial Checks • Electrical supply ✔️ • Compressor condition ✔️ • Wiring… 🚨 problem found ⚠️ What I discovered • A 2-pole contactor was used on a 3-phase compressor • One phase was connected directly to the compressor, bypassing the contactor • The contactor poles were not picking up simultaneously This caused: • Phases engaging out of sync • Compressor starting on uneven phase timing • Result: loud cranking / knocking noise ⚡⚙️ 🛠️ Fix Applied • Replaced the contactor with a proper 3-pole contactor • Rewired all three phases correctly through the contactor • Ensured simultaneous phase engagement ✅ Result • Smooth startup • No abnormal noise • Compressor running normally 🔥 Bonus I applied the same correction on a 5-ton TRANE 3-phase AC that had a similar startup noise — and it worked perfectly 👌 📌 Lesson Learned Using a 2-pole contactor on a 3-phase compressor is a disaster waiting to happen. All phases must engage together, or the compressor will suffer. #DIYHVAC #TRANE #ThreePhase #CompressorNoise #WrongContactor #FieldFix #HVACTechnician #ElectricalMistake #ACRepair #RealWorldHVAC