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“L” SERIES ECONOMIZER
SEQUENCE OF OPERATION
L” SERIES ECONOMIZER
POWER:
1. Terminal strip TB34 energizes the economizer components with 24VAC.
OPERATION:
2. The main control module A55 along with outdoor enthalpy sensor A7 and indoor enthalpy sensor A62
(if differential enthalpy is used) communicates to the economizer control module A56 when to power the
damper motor B7.
3. The economizer control module A56 supplies B7 with 0 - 10 VDC to control the positioning of economizer.
4. The damper actuator provides 2 to 10 VDC position feedback.
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