11-30-2009, 02:05 PM
I found a good deal on a whole house Aprilaire 600M humidifier. I need it installed on a Trane XP80 furnace. My brother-in-law is a sheet metal expert and can easily accomplish the physical installation of the unit. My problem is the electrical hook up. Wiring up the 24v transformer won't be a problem. But, do I need a current sensing relay for this unit? The instructions show to install one "if needed?" If not, how does the humidifier turn off and on with the furnace blower? How do I know if one is needed? Is this a job for an amateur or should I get a pro to do the electrical work?