Deck 17: Hydronic Heat

Question 1

Typical hot water heating systems circulate water in the ____ degree range.

A) 110
B) 140
C) 180
D) 200

Answer 1

C

Question 2

Which pipe is most commonly used in radiant heating systems?

A) PEX
B) PVC
C) CPVC
D) ABS

Answer 2

A

Question 3

In which type of piping system is the first heating unit supplied with hot water also the last heater to return its water to the boiler?

A) series loop
B) one-pipe system
C) two-pipe system
D) two-pipe reverse return system

Answer 3

D

Question 4

The majority of radiant heating piping systems are located in the ____.

A) ceiling
B) walls
C) floors
D) all of the above

Question 5

If an expansion tank were pressurized to 15 psig when installed,and the pump generates a pressure difference of 20 psig,the point of no pressure change for the system would be ____.

A) 10
B) 15
C) 20
D) 25

Question 6

The desired floor temperature for a radiant floor heating system is ____ degrees.

A) 75
B) 85
C) 95
D) 105

Question 7

Which control will prevent the "dry firing " of the boiler?

A) aquastat
B) reset control
C) low water cutoff
D) water regulating valve

Question 8

In a one-pipe system,the same pipe that carries the supply water from the boiler also carries the return water back to the boiler.

Question 9

What voltage are most zone valve motors?

A) 24
B) 115
C) 208
D) 220

Question 10

In a series loop system,the last heater in the circuit will be the warmest.

Question 11

When troubleshooting a three zone hydronic heating system,the technician observes that two zones are operating correctly while the third zone is not getting warm during a call for heat,what is the most likely problem?

A) defective zone valve
B) defective circulator motor
C) open high limit
D) defective burner

Question 12

A circulator pump should always be installed so that the water is pumped away from the expansion tank.

Question 13

When troubleshooting a hydronic heating system,the technician notices the circulator pump running and the burner firing ,but no hot water is flowing through the system,what is the most likely problem?

A) defective circulator pump
B) defective room thermostat
C) air in the system
D) high limit open

Question 14

As water is heated,the volume of the water is decreased.

Question 15

Water flow rate for a hydronic heating system is measured in ____.

A) gallons per minute
B) gallons per hour
C) gallons per second
D) ounces per minute

Question 16

At what pressure do most residential relief valves open?

A) 20
B) 30
C) 40
D) 50

Question 17

Radiant heating systems typically heat the water in the ____ degree range.

A) 110
B) 140
C) 180
D) 200

Question 18

Which type of expansion tank can become water-logged?

A) standard-type
B) diaphragm-type
C) pressure-type
D) vacuum-type

Question 19

Under normal conditions,the human body produces approximately ____ btus.

A) 200
B) 350
C) 500
D) 1000

Question 20

Which is the best method for checking the pressure in an expansion tank?

A) refrigeration gauge set
B) micron gauge
C) U-tube manometer
D) bicycle tire gauge

Question 21

When troubleshooting a residential hydronic heating system,the technician notices that the burner keeps going out on high limit,what is the most likely cause?

A) defective high limit control
B) defective circulator motor
C) defective room thermostat
D) defective zone valve

Question 22

What does the acronym ASME stand for when referring to hydronic heating systems?

Question 23

What is another name for a flow control valve?

Question 24

Name four different methods for heating water in a boiler heating system.

Question 25

A reset control will adjust the water temperature of the boiler according to the _______________ temperature.