Lennox KHA SERIES - Economizer Operation Details; Economizer Wiring Diagram; Economizer Sequence of Operation

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ECONOMIZER
SEQUENCE OF OPERATION
POWER:
1. Terminal strip TB1 found in the main control box energizes the economizer components with 24VAC.
OPERATION:
2. Enthalpy sensor A7 and A62 (if differential enthalpy is used) communicates to the economizer control
module A6 when to power the damper motor B7.
3. Economizer control module A6 supplies B7 with 0 − 10 VDC to control the positioning of economizer.
4. The damper actuator provides 2 to 10 VDC position feedback.