90. Which of the installation steps listed is necessary for the proper operation of the thermostatic expansion valve?

Clean off oxidation from the surface of the suction line and sensing bulb with fine abrasive cloth or steel wool.
Attach the thermal bulb to the suction line using plastic ties.
Heat shrink insulating material around the device once the bulb has been properly secured.
Remove excess lengths of the sensing bulb capillary tube from the device to increase sensitivity.

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