OHIO HYDRONICS CONTRACTOR CERTIFICATION EXAMINATION 2026 PREMIUM QUESTIONS AND SOLUTIONS

OHIO HYDRONICS CONTRACTOR
CERTIFICATION EXAMINATION 2026
PREMIUM QUESTIONS AND SOLUTIONS

◉ 4 pipe diameters
Answer: What is the maximum spacing recommended for the closely
spaced tees on a primary/secondary system?


◉ Angular and parallel
Answer: What are the two types of pump misalignment that must be
checked?


◉ Cavitation
Answer: What is the violent action of vapor bubbles in a centrifugal
pump?


◉ Add static head to piping resistance
Answer: When calculating pump capacity in an open system you
must _____________.


◉ Pump is primed
Answer: A pump is not moving any fluid; what should you check?

, ◉ 34 feet
Answer: What is the maximum theoretical lift of a pump?


◉ HTF is at a high temperature and low velocity
Answer: The best place for air separation is at the boiler; why?


◉ 4 psig
Answer: A typical pressure at the top of a hydronic system with the
pumps off would be __________.


◉ 36 psig
Answer: A system is seven stories tall and it includes a captive
diaphragm expansion tank in the basement, what is the adjusted
tank pressure?


◉ 1-1/2"
Answer: You have installed a 1 inch ATFL sitting in a run of 37 feet to
the boiler fitting; what is the correct size of pipe?


◉ Air pockets, entrained air bubbles, dissolved gases
Answer: Select three ways Air can exist within a hydronic system