AZ ROC C-77 Plumbing Including Solar (Commercial) Practice Questions - Arizona ROC C-77 CR-77 Plumbing Including Solar (Commercial) Examination Exam

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In an active solar water heating system, what is the primary operational function of a differential temperature controller?

To energize the circulator pump when collector temperature exceeds storage tank temperature by a set differential (Delta T ON) To modulate the flow rate of city water directly into the solar collectors based on outdoor ambient air temperature To switch the auxiliary backup heater on whenever solar storage tank temperature drops below 160°F To open the thermal expansion valve when collector loop pressure reaches 100 psi

Correct Answer:

To energize the circulator pump when collector temperature exceeds storage tank temperature by a set differential (Delta T ON)

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