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When a thermostatic expansion valve is installed in a refrigerated container unit, the sensing bulb almost always requires insulation. Why is this so?
A) the insulation prevents air stream temperatures from influencing the bulb temperature
B) the insulation protects the clamp and screws from corrosion
C) the insulation prevents the bulb from vibrating loose
D) the insulation prevents oil entrained in the suction gas from influencing the bulb temperature
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