When replacing a thermostatic expansion valve power element, what is true concerning the thermal bulb?

Correct Answer: Option A — with steel wool or an abrasive cloth remove oxidation on the bulb and suction line

Thermal bulbs must establish optimal metal-to-metal contact for accurate temperature sensing. Scrubbing oxidation, rust, and scale from both the suction line and bulb using emery cloth or steel wool ensures unimpeded thermal conductivity and system control.