The attic solar sensor [thermistor] must be wired "IN-SERIES" [in-line] with the leak detection float's white wires [AS SHOWN ABOVE]. The float is a closed circuit switch. If excess water should ever occur inside the PCS1, the float rises and the switch opens. In AUTO mode, the LX220 interprets this open circuit condition as a cold attic and shuts the bypass valve off. The LX220 "Solar Sensor Service Req'd" light will then turn ON indicating a need for service.
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