I have a Rudd RHPL-HM4824JC Air Handler, Rudd Comfort Control2 500 Series Thermostat (serial communication), and a Honeywell TrueSteam HM 509 humidifier. The humidifer is connected to a humidistat wired in series with a sail switch to prove air flow in the supply duct. However, the humidifier service LED shows an error "HVAC power not present". The Honeywell steam generator appears to need confirmation at its R and C inputs that the HVAC system blower has power. Where can this be taken from the Rudd air handler? (Not sure if the Honeywell requires a 24v signal or a relay closure). I have the wiring diagram of the air handler, in its installation manual.