Does anyone know where i can find a wiring diagram for a model 600 aprilaire humidifier.

You can purchase the tubing at most hardware stores or any HVAC supply store. They carry the vinyl plastic tubing and pvc pipe for drain lines.

Hello, no the humidifier does not have a power cord. It needs to be wired to a transformer to provide 24 volts to power it.

sounds like you may have it wired to a continuous power source vs one that shuts off with the furnace. The most common wiring is red to C & white to W

go for the Aprilaire 600 but make sure they install the outdoor sensor and set it up for AUTO operation

if the wire to the outdoor sensor runs close to high voltage wiring it may cause that

You should have a #50 relay hooked up to the main blower assembley to turn the 24 volts on and off with the blower to the humidistat. Alot of humidifiers sold do not tell you about the #50 relay. They assume that you are a hvac pro and you aready know about.
Good luck
HVAC Teacher

HVAC Mechanic.com

check this website for a wiring diaghram Aprilaire 700 Repair Parts & Supplies
http://www.arnoldservice.com/Aprilaire_700_repair_parts_supplies.htm

I logged on to the April Aire website and found the wire diagram i needed.
they have really good information on all their units. thanks.sc.

Call Aprilaire and tell them, this is happining everywhere