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117. Which of the following illustrated thermal expansion valves would be appropriate to use on an evaporator coil with an 8 psi pressure drop, where externally adjustable superheat and a replaceable power element are both desired
Valve D is the correct choice because it features an external equalizer for the 8 psi pressure drop, an externally adjustable superheat mechanism, and a replaceable power element, unlike the other valves.
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