Deck 26: Hydronic Heat

Question 1

Which pipe is most commonly used in radiant heating systems?

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

Answer 1

A

Question 2

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

Answer 2

A

Question 3

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

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

Answer 3

B

Question 4

Which type of expansion tank can become waterlogged?

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

Question 5

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

Question 6

What voltage are most zone valve motors?

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

Question 7

Radiant heating systems typically heat the water in the __________-degree range.

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

Question 8

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

Question 9

At what pressure do most residential relief valves open?

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

Question 10

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

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

Question 11

Under normal conditions, the human body produces approximately __________ Btus.

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

Question 12

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 13

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

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

Question 14

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

Question 15

Typical hot-water heating systems circulate water in the __________-degree range.

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

Question 16

If an expansion tank were pressurized to 15 psig when installed, and the pump generated 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 17

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 18

When troubleshooting a hydronic heating system, the technician notices that the circulator pump is running and the burner is 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 19

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 20

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

Question 21

What is another name for a flow control valve?

Question 22

Hydronic heating fluid can run through long lengths of pipe before reaching a terminal unit.; heat is lost through the walls of the pipes. To retain as much heat as possible, pipes need to be insulated. Building codes require that the pipes be wrapped with __________ insulation to reduce heat loss. Insulations with R values ranging from __________ are an even better choice to improve the energy efficiency of the hydronic heating system.

Question 23

A __________ is a heat exchanger installed in the boiler that connects to the hot water pipes of the house.

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.

Question 26

A minimum of __________ inches of rigid foam insulation is needed beneath the radiant heated slab to prevent excessive heat loss and improve the efficiency of the system.

A) 3
B) 4
C) 5
D) 6

Question 27

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

Question 28

A/n __________ is a water storage tank an internal heat exchanger that is serviced by the main boiler.

A) compression tank
B) expansion tank
C) indirect water storage tank
D) tankless hot water heater

Question 29

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