Basic Hot Water Heating Systems

Question 1

What is the maximum capacity of a Class 2 transformer?

Answer 1

100 VA

Question 2

What is the purpose of a reverse acting aquastat?

Answer 2

To prevent cold water from circulating in a heating system

Question 3

A boiler with standing pilot ignition will incorporate a flame rod to prove the pilot flame.

True or False

Answer 3

False

Question 4

The biggest advantage of a multi-zone system is:

a) individual zone temperature control.
b) only one circulation pump.
c) dustless heat distribution.

Answer 4

a) individual zone temperature control.

Question 5

Which is not a recommended safety and control devices for a boiler?

a) aquastat
b) flow switch
c) LWCO
d) zone valve

Answer 5

d) zone valve

Question 6

A circuit breaker can be used as a disconnect for a boiler.

True or False

Answer 6

True

Question 7

The three wire zone valve:

a) maintains its position in a power failure
b) requires a special thermostat
c) requires power to open and close the valve
d) all of the above

Answer 7

d) all of the above

Question 8

Which system utilizes a high-temperature element to ignite the main burner?

a) flame rod and ignition
b) direct spark ignition
c) hot surface ignition
d) standing pilot ignition

Answer 8

c) hot surface ignition

Question 9

An end-of-travel, or end switch, is normally open set of contacts that will close when the zone valve opens?

True or False

Answer 9

True

Question 10

Which of the following is not considered a terminal unit in a hot water heating system?

a) radiator
b) radiant panel
c) solar panel
d) plenum mounted heat exchanger

Answer 10

c) solar panel

Question 11

A gas-filled bulb/capillary tube device utilized as a temperature switch in a hot water heating system is referred to as a/an:

a) pressure relief valve
b) low water cut-out
c) end switch
d) aquastat

Answer 11

d) aquastat

Question 12

To create a spark, the ignition transformer supplies the spark igniter with typically:

a) 24V
b) 120V
c) 10kV
d) either b or c

Answer 12

c) 10kV

Question 13

Intermittent circulation boilers must use a pilot light to the main burner.

True or False

Answer 13

False

Question 14

In a single zone continuous circulation boiler system, the thermostat controls the:

a) circulation pump
b) gas valve
c) zone valve
d) all of the above

Answer 14

b) gas valve

Question 15

A light-sensitive flame proving device will:

a) experience a change in resistance when exposed to light
b) emit a small amount of light when exposed to heat
c) generate a small emf when exposed to light
d) provide the means to ignite the pilot flame

Answer 15

a) experience a change in resistance when exposed to light

Question 16

When two-wire valves are de-energized they will:

a) open
b) close
c) either a or b

Answer 16

c) either a or b

Question 17

CEC rules 26-800 to 26-808 apply only to forced air heating systems and do not apply to boilers.

True or False

Answer 17

False

Question 18

A reverse acting aquastat would be incorporated into a boiler control circuit to create a/an ___________ circulation system.

a) intermittent
b) continuous
c) cavitating
d) hydronic

Answer 18

a) intermittent

Question 19

Circulation pumps can be a single or variable speed depending on the system.

True or False

Answer 19

True

Question 20

A pressure relief valve opens when the boiler exceeds its maximum allowable working pressure.

True or False

Answer 20

True

Question 21

Seprate water flow circuits in a hot water heating system are known as:

a) circulation systems
b) multi-zone
c) radiant panels
d) zones

Answer 21

—— Come back to this, no answer in the key.

Question 22

What is the typical voltage for zone valves?

a) 10 V
b) 24 V
c) 120 V
d) 240 V

Answer 22

b) 24 V

Question 23

What is the purpose of a flame rod?

Answer 23

to detect a burner flame

Question 24

What is an LWCO used for?

Answer 24

to shut off the burner if the boiler water is too low.

Question 25

What are the two types of aquastats?

Answer 25

a) immersion

b) surface mount

Question 26

What is a device that transfers heat from one system to another called?

a) a heat transfer switch
b) a hydronic
c) a heat circulator
d) a heat exchanger

Answer 26

d) a heat exchanger