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Our local high school had one of these in service. It controlled HVAC all over the school with rf thru the ac wiring. Seems it was at about 290khz and the 2nd harmonic was wiping out our 580khz broadcast for about 1/2 mile around the school including the neighborhood the station owner lives in. After tracking it down with my Nemis-Clark I contacted Johnson controls, they said it only happens in cities with a 580 radio station. They fixed it a few days later.
ours is hard wired to 2 exhaust fans. Johnson controls keeps documentation locked up and reserved for its techs. only doc I could find online was how to wire/install. absolutely nothing on programming/ setting parameters .