Lennox ALLIED Commercial TCA180S2B Standard Manual page 51

POWER:
1. Economizer control module A6 is energized through main module A45, P142 when contactor K3 is ener-
gized.
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.
T" SERIES ECONOMIZER
SEQUENCE OF OPERATION
Page 51