Heat is R to W
Cool is R to Y
Fan ON is R to G
R is 24 volts hot and C is the Common side of the transformer
Humidity would depend on the type of humidifier. If it is a 24 volt humidifier then the humidistat takes power from W and sends it to the humidifier. You want the heat ON when humidifying as it needs to vaporize the water.
Here is a link to a site with a bunch of manuals. Click on the Lennox G51 as I have one and it is a basic furnace. Go to page 42 and it has a sequence of operation. Most furnaces follow the same sequence.
http://www.hvacpartsshop.com/manuals/lennox-furnace-service-manuals.html
Cool is R to Y
Fan ON is R to G
R is 24 volts hot and C is the Common side of the transformer
Humidity would depend on the type of humidifier. If it is a 24 volt humidifier then the humidistat takes power from W and sends it to the humidifier. You want the heat ON when humidifying as it needs to vaporize the water.
Here is a link to a site with a bunch of manuals. Click on the Lennox G51 as I have one and it is a basic furnace. Go to page 42 and it has a sequence of operation. Most furnaces follow the same sequence.
http://www.hvacpartsshop.com/manuals/lennox-furnace-service-manuals.html