Honeywell - W7215B1004

DIFFERENTIAL: W7215B1004 SOLID THERMOSTATE ECONOMIZER C/O CNTRL, SPDT RELAYS, 2 SENSOR INPUTS FOR DIFFERENTIAL ENTHALPY (C7400), 1 ADDITIONAL INDOOR & 1 ADDITIONAL OUTDOOR AIR SENSOR IN- PUT (2-10VDC), USE W/ HW SERIES 72 MOTORS &