I have recently purchase an Aprilaire 600A humidifier to be installed on Lennox furnace 90UGF model. Does any one have any idea or experience installing this type of humidifier?

The following instruction is on ADHC terminal strip:

 R & C wire to 24 VAC transformer, (I understand this part.)
 A & B NO wiring, (I understand this part.)
 ODT wire to the outdoor temperature sensor, (I understand this part.)
 W/G wire to HUM (ACC OR EAC) on my accessory terminal I cannot find HUM nor EAC, but I see ACC and HTG ACC, should I wire W/G to ACC or HTG ACC? Also, is either these two 120 volt or 24 VAC?
 Cf wire to COMMON, is this 120 volt or 24VAC? Also is COMMON = C?
 H wire to humidifier, (I understand this part.)

Can someone please help?