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David WhiteAug 5, 2025
How to troubleshoot a Dunham-Bush Chiller that will not start?
- PPaul WellsAug 5, 2025
If your Dunham-Bush Chiller unit isn't starting, several factors could be at play. Here's what to check: * **Power Supply:** Begin by verifying the main disconnect switch and fuses. * **Control Power:** Inspect the control transformer fusing. * **Circuit Breakers:** Ensure the compressor circuit breakers are closed. If they trip, examine the compressor itself. * **Undervoltage Relay:** Look for power supply issues like low voltage or phase imbalance. Correct any problems and then press the reset button. * **Flow Switch:** Start the pumps and check the flow switch. * **Compressor Switch:** Turn the compressor switch on and check the alarm status, addressing any issues. * **Microcomputer Shutdown:** Press the reset button to clear any microcomputer shutdowns.
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