ECONOMIZER SEQUENCE OF
OPERATION
CONDITION A — COOL OUTDOORS
First stage cooling closes and powers the economizer dampers to economizer mode and the indoor blower starts. Mixed Air Sensor senses a mixture of return air and outdoor air and modulates the dampers accordingly. Compressor operation is inhibited. (See Figure 7.)
If second stage closes on the thermostat, the dampers return to the closed or minimum position setting and the compressor starts for mechanical cooling.
FIGURE 7
CALL FOR BLOWER OPERATION
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