HVAC Unit 33 Hydronic Heat Review Questions and Answers with
Verified Solutions | Latest 2026 Update
Q: the _____ valve.
Answer:
Pressure relief. pg 846
Q: Describe the function of a low-water cut-off.
Answer:
It is responsible for deenergizing the system in
the event the level water in the system drops below the desired point. pg 847
Q: The relief valve setting for a typical low-pressure boiler is ____ psig.
Answer:
30. pg 846
, HVAC Unit 33 Hydronic Heat Review Questions and Answers with
Verified Solutions | Latest 2026 Update
Q: Describe how an air cushion tank functions in a hydronic heating system.
Answer:
When water is
added to the system, air is pushed into the expansion tank, causing pressure in the
tank to
increase. Since air is able to compress, the hot water can expand and contract without
causing
the pressure relief valve to constantly open. pg 837
Q: T of F: City water does not contain air.
Answer:
False
Q: State two ways that air can get into a hydronic heating system.
Answer:
Makeup water
By the maintenance technician
Verified Solutions | Latest 2026 Update
Q: the _____ valve.
Answer:
Pressure relief. pg 846
Q: Describe the function of a low-water cut-off.
Answer:
It is responsible for deenergizing the system in
the event the level water in the system drops below the desired point. pg 847
Q: The relief valve setting for a typical low-pressure boiler is ____ psig.
Answer:
30. pg 846
, HVAC Unit 33 Hydronic Heat Review Questions and Answers with
Verified Solutions | Latest 2026 Update
Q: Describe how an air cushion tank functions in a hydronic heating system.
Answer:
When water is
added to the system, air is pushed into the expansion tank, causing pressure in the
tank to
increase. Since air is able to compress, the hot water can expand and contract without
causing
the pressure relief valve to constantly open. pg 837
Q: T of F: City water does not contain air.
Answer:
False
Q: State two ways that air can get into a hydronic heating system.
Answer:
Makeup water
By the maintenance technician
