ITAZ RQ: Hot Water Boilers

Question 1

Copper-tube boilers typically have

a. better heat transfer characteristics, and longer lifespans than cast-iron boilers
b. better heat transfer characteristics, but shorter lifespans than cast-iron
c. worse heat transfer characteristics, but longer lifespans than cast-iron boilers
d. roughly similar characteristics to cast-iron boilers

Answer 1

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Question 2

• 2- Which of the following is a similarity between furnaces and boilers?
  a. Piping
  b. A low-level safety device
  c. High-temperature limit switches
  d. Backflow preventers
  e. A pressure-relief valve

Answer 2

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Question 3

Heat exchanger diagnosis on boilers is easier than on furnaces because the heat exchanger will leak when it has failed. (True or False?)

Answer 3

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Question 4

List the four safety controls found on hydronic systems.

Answer 4

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Question 5

What is the normal operating pressure in a boiler?

a. 2-5 psi
b. 5-9 psi
c. 9-12 psi
d. 12-15 psi
e. 15 to 18 psi

Answer 5

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Question 6

What is the common temperature setting for the high temperature limit switch?

Answer 6

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Question 7

What is the purpose of the low-water cutout on a residential boiler?

Answer 7

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Question 8

Why do we need a back flow preventer on a modern hydronic system?

Answer 8

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Question 9

What is the function of the pressure-reducing valve?

Answer 9

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Question 10

In a two-story Victorian home with a boiler in the basement, you find a pressure-reducing valve set to 12 psi. Is there a possibility that this valve is set too low?

Answer 10

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Question 11

What is the basic difference between an open system and a closed system?

Answer 11

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Question 12

Where is the expansion tank typically, in an open system?

Answer 12

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Question 13

When a black steel pipe is extended with copper pipe, what can occur?

a. The steel pipe may rust at the connection due to galvanic reaction.
b. The circulator may not be able to overcome the pressure change at the junction.
c. The copper pipe will wear through with the friction force of the water.
d. The copper pipe will rust because of the galvanic reaction.
e. Nothing occurs when steel and copper piping are joined.

Answer 13

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Question 14

Mixing convectors and radiator in a single hydronic system will often result in uncomfortable heating. (True or False)

Answer 14

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Question 15

What is the purpose of the bleed valve near the top of the radiator?

Answer 15

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Question 16

List three styles of circulators.

Answer 16

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Question 17

Why are radiator valves particularly vulnerable?

Answer 17

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