Hydronic heating Exam Questions with Correct
Answers
What are the four main hydronic heating piping layouts that are commonly installed?
ONE PIPE - SERIES LOOP - CAN ALSO BE CALLED A PERIMETER HEATING
SYSTEM
ONE PIPE - MONOFLOW OR DIVERSION TEE
TWO PIPE - DIRECT RETURN
TWO PIPE - REVERSE RETURN
What is the purpose of an expansion tank in a hot water heating system and where
should it be located?
PREVENTS THE PRESSURE RELIEF VALVE FROM GOING OFF WHEN THE
BOILER FIRES UP - IN THE END IT PREVENTS MORE WATER FROM GETTING
INTO THE SYSTEM AND CAUSING CORROSION THE EXPANSION TANK SHOULD
BE LOCATED UPSTREAM FROM THE SYSTEM PUMP. THE PLACE WHERE THE
EXPANSION TANK IS ATTACHED IS COMMONLY KNOWN AS THE POINT OF NO
PRESSURE CHANGE.
Where is the best location for the circulator to be installed on a hydronic heating
system?
THE BEST LOCATION IS ON THE SUPPLY PIPING LEAVING THE BOILER. IT
SHOULD BE LOCATED DOWNSTREAM OF THE EXPANSION TANK. ANOTHER
POSSIBLE LOCATION WOULD BE ON THE RETURN PIPING INTO THE BOILER. IN
SOME CASES A CIRCULATOR CAN BE PLACED ON BOTH THE SUPPLY AND THE
RETURN PIPING. THIS WOULD ME MORE LIKELY IN A SITUATION THAT
, REQUIRES A CONSTANT AND STEADY FLOW, SUCH AS A HEAT PUMP GROUND
LOOPS.
What is the pressure relief valve in a residential boiler usually set to? Where is it
usually located? What would cause the pressure relief valve to start dripping?
THE PRESSURE RELIEF VALVE IS USUALLY SET TO 30 PSIG ITS LOCATED ON
THE BOILER IT MUST BE ABLE TO RELIEVE 100% RATING OF THE BOILER
WATERLOGGED EXPANSION TANK
What is make-up water on a hydronic heating system? What is another name for the
pressure reducing valve that reduces the pressure before it get into the system? What is
the pressure in a residential hydronic heating system usually set to?
MAKE UP WATER IS WATER THAT IS INTRODUCED INTO THE CLOSED
HYDRONIC SYSTEM WHEN WATER EITHER LEAKS OUT THROUGH A BREAK IN
THE SYSTEM OR MORE COMMONLY WHEN THE RELIEF VALVE KICKS OFF.
THE PRESSURE REDUCING VALVE CAN ALSO BE KNOWN AS THE FEED WATER
VALVE THE PRESSURE IN A RESIDENTIAL HYDRONIC HEATING SYSTEM IS
USUALLY SET TO BETWEEN 12-20 PSIG
What is aw flow check valve and where is it located? What is the difference between a
flow check and a flow switch
A FLOW CHECK IS A VALVE THAT PREVENTS THE UNWANTED FLOW OF
WATER THROUGH A SYSTEM WHEN THE BURNER IS NOT ON. ITS LOCATED ON
THE SUPPLY LEAVING THE BOILER A FLOW SWITCH ENSURES FLOW THOUGH
THE SYSTEM BEFORE THE BURNER WILL KICK ON
Answers
What are the four main hydronic heating piping layouts that are commonly installed?
ONE PIPE - SERIES LOOP - CAN ALSO BE CALLED A PERIMETER HEATING
SYSTEM
ONE PIPE - MONOFLOW OR DIVERSION TEE
TWO PIPE - DIRECT RETURN
TWO PIPE - REVERSE RETURN
What is the purpose of an expansion tank in a hot water heating system and where
should it be located?
PREVENTS THE PRESSURE RELIEF VALVE FROM GOING OFF WHEN THE
BOILER FIRES UP - IN THE END IT PREVENTS MORE WATER FROM GETTING
INTO THE SYSTEM AND CAUSING CORROSION THE EXPANSION TANK SHOULD
BE LOCATED UPSTREAM FROM THE SYSTEM PUMP. THE PLACE WHERE THE
EXPANSION TANK IS ATTACHED IS COMMONLY KNOWN AS THE POINT OF NO
PRESSURE CHANGE.
Where is the best location for the circulator to be installed on a hydronic heating
system?
THE BEST LOCATION IS ON THE SUPPLY PIPING LEAVING THE BOILER. IT
SHOULD BE LOCATED DOWNSTREAM OF THE EXPANSION TANK. ANOTHER
POSSIBLE LOCATION WOULD BE ON THE RETURN PIPING INTO THE BOILER. IN
SOME CASES A CIRCULATOR CAN BE PLACED ON BOTH THE SUPPLY AND THE
RETURN PIPING. THIS WOULD ME MORE LIKELY IN A SITUATION THAT
, REQUIRES A CONSTANT AND STEADY FLOW, SUCH AS A HEAT PUMP GROUND
LOOPS.
What is the pressure relief valve in a residential boiler usually set to? Where is it
usually located? What would cause the pressure relief valve to start dripping?
THE PRESSURE RELIEF VALVE IS USUALLY SET TO 30 PSIG ITS LOCATED ON
THE BOILER IT MUST BE ABLE TO RELIEVE 100% RATING OF THE BOILER
WATERLOGGED EXPANSION TANK
What is make-up water on a hydronic heating system? What is another name for the
pressure reducing valve that reduces the pressure before it get into the system? What is
the pressure in a residential hydronic heating system usually set to?
MAKE UP WATER IS WATER THAT IS INTRODUCED INTO THE CLOSED
HYDRONIC SYSTEM WHEN WATER EITHER LEAKS OUT THROUGH A BREAK IN
THE SYSTEM OR MORE COMMONLY WHEN THE RELIEF VALVE KICKS OFF.
THE PRESSURE REDUCING VALVE CAN ALSO BE KNOWN AS THE FEED WATER
VALVE THE PRESSURE IN A RESIDENTIAL HYDRONIC HEATING SYSTEM IS
USUALLY SET TO BETWEEN 12-20 PSIG
What is aw flow check valve and where is it located? What is the difference between a
flow check and a flow switch
A FLOW CHECK IS A VALVE THAT PREVENTS THE UNWANTED FLOW OF
WATER THROUGH A SYSTEM WHEN THE BURNER IS NOT ON. ITS LOCATED ON
THE SUPPLY LEAVING THE BOILER A FLOW SWITCH ENSURES FLOW THOUGH
THE SYSTEM BEFORE THE BURNER WILL KICK ON
