The HAX-53Y auxiliary plug in card incorporates 3 x 0-10VDC Outputs,Yh for Heating, Ye for Economy Cycle and Yc for Cooling.
The Yh & Yc outputs have a common Dead Zone adjustment ranging from 0.5 to 5.0 Degrees Celsius and the Ye output has a
Damper Minimum Position Adjustment ranging from 0 to10 VDC which is equal to 0 to 100 %. The HAX-53Y has LED status indication for
all outputs, and also incorporates a Damper Auto Close Feature which negates the use of an outside air thermostat for Damper  Override.