 HONEYWELL W859F1021 Economizer for Modutrol Motors. Contain all controls needed to operate an outdoor return air damper system, when used with an M91XX Modutrol IV Motor with internal balancing relay.Features Combines functions of proportional mixed air temperature controller, outside air changeover controller, minimum position potentiometer, and air conditioning compressor lockout in one package. Can be connected to the cooling thermostat to provide a totally integrated control system that locks out the economizer during the heating system. Used with an H205A or H705A Enthalpy Control to provide maximum economy in high humidity areas. Includes lead wires for remote minimum position potentiometer and remote changeover switch. 24 Vac power supply only. Mounts in place of Modutrol IV Motor cover, when used with 203977A bracket. Weatherproof screw-on caps prevent accidentally changing control adjustments. Hook provided to support device on side of Modutrol IV Motor during wiring.
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