My HVAC dealer installed a Carrier Infinity controller and a Skuttle 60-1 humidifier and I noticed that the humidifier is not working. They connected the 24 VAC HUM and COM outputs directly to the input connections on the Skuttle. Based on further review it appears that this will not work and has never worked. They did not leave any other Skuttle equipment behind.
It appears based on the Skuttle wiring diagram that the two terminals on one of the connectors are a constant ground (black) and a switched ground (yellow). It appears that the 24VAC is generated from an internal transformer when their is a ground on the switched input terminal.
1) How should I hook this up to work with the Carrier Infinity controller? It appears that I need a 24VAC relay that completes a ground circuit (yellow) when there is voltage between the HUM and COM carrier outputs. If so, what is a good relay to use?
2) Under what conditions is there 24VAC between the HUM and COM outputs? It appears there is voltage when fan is not running. Actually, I cannot get the Carrier to stop generating the 24VAC on the HUM and COM outputs. If this is so then the Skuttle will boil the water when there is no air flow. This does not seem right.