The power element (consisting of the bulb, capillary tube, and power head) contains a charge which is usually a refrigerant - the same refrigerant as that running in the system.
The refrigerant in the bulb is a saturated vapor. Because the bulb is strapped to the suction line, the temperature of the charge is equal to the suction line temperature. As the suction line temperature increases so does the temperature of the charge.
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