Hydronic heating Questions with Correct
Answers
5 benefits
Consistent temp, increased efficiency, no air contaminants, do not remove moisture, easier to
install
Why does temp remain steady in hydronic hesring
Even though the pump is off the pipes still contain heat which radiates in the room
What happens when temp drops below 140c
Combustion gases condense back into a liquid
Why is corrosion not a problem in condensing boilers
They are built to withstand the corrosive condensate and drain it away
Condensing boilers are equipped with ---- that remove heat and gas
Heat exchangers
Proplylene glycol is more environmentally harmful than
Ethylene glycol
Why does corrosion happen in hydronic heating systems
Because of the acidic water
How do chemical scavengers prevent corrosion
They interact with the containments rendering them inert
What is embrittlement
, Weakening of metal
Three places where embrittlement may cause structure faulure
Seams, rivets, tube ends
Proper ph level
Between 7 and 10
What is a wet centrifugal pump
Eliminates the need for a shaft seal and reduces noise
Expansion tank is filled with
Water and air
Charging an expansion tank
Use a bicycle pump
A ---- valve blends hot water from one inlet with cold water
Mixing valve
Motorized mixing valve
Monitors the water temp and a built in electric motor that adjusts the valve as needed based
on sensor feedback
If the supply water is not hot enough what will the mixing valve do
Recirculates the water through the boiler
What happens if terminal units are not balanced
Answers
5 benefits
Consistent temp, increased efficiency, no air contaminants, do not remove moisture, easier to
install
Why does temp remain steady in hydronic hesring
Even though the pump is off the pipes still contain heat which radiates in the room
What happens when temp drops below 140c
Combustion gases condense back into a liquid
Why is corrosion not a problem in condensing boilers
They are built to withstand the corrosive condensate and drain it away
Condensing boilers are equipped with ---- that remove heat and gas
Heat exchangers
Proplylene glycol is more environmentally harmful than
Ethylene glycol
Why does corrosion happen in hydronic heating systems
Because of the acidic water
How do chemical scavengers prevent corrosion
They interact with the containments rendering them inert
What is embrittlement
, Weakening of metal
Three places where embrittlement may cause structure faulure
Seams, rivets, tube ends
Proper ph level
Between 7 and 10
What is a wet centrifugal pump
Eliminates the need for a shaft seal and reduces noise
Expansion tank is filled with
Water and air
Charging an expansion tank
Use a bicycle pump
A ---- valve blends hot water from one inlet with cold water
Mixing valve
Motorized mixing valve
Monitors the water temp and a built in electric motor that adjusts the valve as needed based
on sensor feedback
If the supply water is not hot enough what will the mixing valve do
Recirculates the water through the boiler
What happens if terminal units are not balanced
