Wiring a 24VAC Vacuum Pump to 220VAC Mains Supply - Need Help
The pump is specified to receive 24 V 50/60 Hz half-wave rectified power. When using a diode bridge circuit, you would be applying 100/120 Hz to the pump (no works). Just attracted my attention the hint that you received from the application engineer in order to use a diode in series, since (by the diagram provided on the site - copied below), the pump seems to already incorporate such a diode internally.