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AZ ROC R-4R Boilers (Residential) Practice Questions - Arizona ROC R-4R Boilers (Residential) Examination Exam

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Prior to installing a diaphragm expansion tank on a 2-story residential hydronic heating system with a cold fill pressure of 12 psig, what should the air pre-charge pressure of the tank be set to while unpressurized on the water side?
Correct Answer:
12 psig

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