OHIO HYDRONICS CONTRACTOR
COMPREHENSIVE LICENSING
EXAMINATION SCRIPT 2026 FULL
SOLUTIONS GUIDE GRADED A+
◉ A water loop system circulates water from the chiller condenser
to the cooling tower and back to the chiller condenser and is
typically a(n) ___ system.
Answer: open
◉ Commissioning is the adjusting of flow to each circuit, zone, and
terminal unit to ensure that the heating or cooling needs of each
space are being met adequately.
Answer: False
◉ Contaminants decrease the efficiency of heating systems and
cause damage to the components.
Answer: True
◉ From the total volume needed, the amount of glycol and water is
calculated from the concentration percentage.
, Answer: True
◉ Glycol concentrations up to about ___% can be checked with a
refractometer or glycol test kit.
Answer: 55
◉ If a terminal unit has ___-way thermostatically controlled valves
with bypasses, a two-step balance is required.
Answer: three
◉ In a hydronic system, HTF flow problems include air in the system
that causes air lock, cavitation, HTF deterioration, and inefficient
heat transfer.
Answer: True
◉ In all applicable plans and specifications, the connection points of
any primary and secondary piping circuits should be identified.
Answer: True
◉ Many of the hydronic system components, such as the pump, the
expansion tank, and the motorized valves, should last about ___
years.
Answer: 20
COMPREHENSIVE LICENSING
EXAMINATION SCRIPT 2026 FULL
SOLUTIONS GUIDE GRADED A+
◉ A water loop system circulates water from the chiller condenser
to the cooling tower and back to the chiller condenser and is
typically a(n) ___ system.
Answer: open
◉ Commissioning is the adjusting of flow to each circuit, zone, and
terminal unit to ensure that the heating or cooling needs of each
space are being met adequately.
Answer: False
◉ Contaminants decrease the efficiency of heating systems and
cause damage to the components.
Answer: True
◉ From the total volume needed, the amount of glycol and water is
calculated from the concentration percentage.
, Answer: True
◉ Glycol concentrations up to about ___% can be checked with a
refractometer or glycol test kit.
Answer: 55
◉ If a terminal unit has ___-way thermostatically controlled valves
with bypasses, a two-step balance is required.
Answer: three
◉ In a hydronic system, HTF flow problems include air in the system
that causes air lock, cavitation, HTF deterioration, and inefficient
heat transfer.
Answer: True
◉ In all applicable plans and specifications, the connection points of
any primary and secondary piping circuits should be identified.
Answer: True
◉ Many of the hydronic system components, such as the pump, the
expansion tank, and the motorized valves, should last about ___
years.
Answer: 20
