Electrical Projects

Testing

In general, both live and resistance testing are used. When reading high voltage, be careful of electrical shock hazard. Immediately after a voltage test, be sure to disconnect the cord and discharge the capacitors before touching any electrical components.

The voltage ratings given here are based on a line voltage of 120V ac. Any variance in the line voltage will affect the high-voltage reading. The testing equipment shown is an RCA Model WV-38A VOM with an RCA WG-297 high-voltage probe and RCA WG-211 resistor (but any similar meter with a high-voltage probe can be used). The high voltage probe and resistor allow a reading of up to 25,000V.

The ionizer is tested with the rear grille removed, the chemical-filter frame in place, and the unit running on total filtration. Connect the high-voltage probe to the VOM as shown in Fig. 5-15. Set the VOM on the 250V dc scale. Connect the clip of the probe to the frame of the unit, preferably to the thumb fastener of the ionizer. Touch the probe to the connection of the ionizer-wire spring and terminal in the lower left corner. The reading on the VOM is 100 times the 250V dc scale. Voltage on the ionizer wire should be at least 5800V and may go as high as 6500V. A low voltage would indicate a defective rectifier or transformer.




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November 20, 2008