EWC Controls Forum

hi i just tried to replace an old ewc zone damper with a honeywell zd 24 x 8 with 2 wires on the motor. the problem is that i have 3 wires to deal with, and the damper i have is spring open, power close. the control panel is pretty old, i'd say 15 to 20 yrs old? i think it could be st-2 model. can ...