The Model 55 is a rather strong generator of Electro Magnetic Interference (EMI), sometimes referred to as Radio Frequency Interference (RFI). Various precautions can be observed to significantly reduce this interference, but it may not be totally eliminated. This potential problem should be considered when selecting installation locations.

Interruption of high voltage current causes small amounts of ozone gas to be produced. The continual interruption of high voltage by the Model 55 can cause rather high concentrations of ozone gas to accumulate in insufficiently vented areas. Concentrated ozone gas had a very corrosive effect on certain materials. Brass, copper, steel and most types of paint on metal are among those materials adversely effected. Porcelain, glass, pure aluminum, and stainless steel are several materials that resist the corrosive effects of ozone gas. Install the Model 55 in well vented areas which will allow the ozone to dissipate.