Hydronic Heating Boilers

Question 1

What is the maximum temperature for a low temperature hot water boiler?

Answer 1

120 c
250 f

Question 2

What is the maximum pressure for a low temperature hot water boiler?

Answer 2

1100 kPa or 160 psig

Question 3

How are low temperature hot water boilers rated?

Answer 3

BTUH or EDR

Question 4

Are low temperature hot water boilers net or gross rated?

Answer 4

Net

Question 5

What section of the ASME do low temperature boilers comply with?

Answer 5

4

Question 6

What is the lower temperature that high temperature hot water boilers may exceede?

Answer 6

120 c
250 f

Question 7

What is the upper pressure limit for a heigh temperature hot water boiler?

Answer 7

There is none

Question 8

How are high temperature hot water boilers rated?

Answer 8

MBH or BHP

Question 9

Are high temperature hot water boilers net or gross rated?

Answer 9

Gross

Question 10

With what section of the ASME must heigh temperature hot water boilers comply?

Answer 10

1

Question 11

In what 3 ways are boilers rated?

Answer 11

Input
Gross output
Net rating

Question 12

How many BTU’s dose it take to raise one pound of water one degree Fahrenheit?

Answer 12

1

Question 13

One Boiler Horse Power (BHP) will evaporate how many pounds of water per hour?

Answer 13

34.5

Question 14

What dose input represent in a boiler consumption?

Answer 14

Amount of heat in the fuel burned by the burner.

Question 15

Name 4 types of boilers.

Answer 15

Fire tube
Water tube
Cast iron sectional
Condensing

Question 16

In a fire tube boiler what surrounds the tubes?

Answer 16

Water.

Question 17

In a water tube boiler what is in the tubes?

Answer 17

Water.

Question 18

Cast iron is an excellent material for the construction of sectional boilers. Why?

Answer 18

Natural corrosion resistance provides them a long life span with minimal maintenance.

Question 19

Do cast iron sectionals hold more or less fluid than their copper and steel counterparts?

Answer 19

Much more volume of fluid.

Question 20

What are the 2 categories of cast iron sectional boilers?

Answer 20

Vertical

Horizontal

Question 21

What are horizontal cast iron sectional boilers also called?

Answer 21

Pancake boiler

Question 22

In a condensing boiler what is the heat exchanger made from?

Answer 22

Stainless steel

Question 23

Condensing boilers operate with a high or low temperature return?

Answer 23

Low

Question 24

Both water and fire tube boilers use steel heat exchangers.

True or False?

Answer 24

True

Question 25

Water tube boilers use only copper tube heat exchangers. True or False?

Answer 25

True

Question 26

Name 2 high mass boilers.

Answer 26

Fire tube Cast iron sectional

Question 27

Name 2 low mass boilers

Answer 27

Water tube Condensing

Question 28

Which type of boiler uses tie rods and push nipples for assembly?

Answer 28

Cast iron sectional

Question 29

What is the major disadvantage of a high mass boiler?

Answer 29

Slow recovery Potential for explosion

Question 30

What is the first process before installation of a boiler?

Answer 30

Inspect unit for damage

Question 31

What 2 types of air supply must be supplied for proper installation?

Answer 31

Combustion and ventilation

Question 32

Which section of the ASME contains rules for care and operation of heating boilers?

Answer 32

6

Question 33

Why could be the result of low fluid pressure in a boiler?

Answer 33

Lead to no fluid and boiler not firing

Question 34

If you find fluid leaking past the pressure relief valve what is the first thing to check?

Answer 34

Pressure in boiler

Question 35

What should be checked on the combustion air inlet?

Answer 35

Free from obstruction and dirt.

Question 36

What is the BTU value of an EDR?

Answer 36

Steam 240 btu/h Hot water 150 btu/h

Question 37

What problem will occur in a conventional boiler if the flue gases are cooled to their dew point?

Answer 37

Draft hood spillage or damage caused by corrosive condensate.

Question 38

Which is classified as a high mass boiler? Copper tube Steel water tube Copper tube for domestic water supply Cast iron sectional

Answer 38

Cast iron sectional

Question 39

What code covers the fabrication, installation, and inspection of boilers?

Answer 39

ASME code

Question 40

What does ASME stand for?

Answer 40

American Society of Mechanical Engineers

Question 41

Which of these boilers can be used to directly heat domestic water? Cast iron sectional Steel fire tube Cast iron condensing Copper water tube

Answer 41

Copper water tube

Question 42

How would you classify a fire tube boiler?

Answer 42

High Mass

Question 43

What can cause coil damage in a low mass boiler?

Answer 43

Low or no flow through the heat exchanger.

Question 44

What material is commonly used to construct sectional boilers?

Answer 44

Cast iron

Question 45

What is the purpose of the safety relief valve?

Answer 45

To protect the boiler system from excess pressure.

Question 46

When installing a boiler where would you find the clearance to combustibles?

Answer 46

Appliance rating plate.

Question 47

When providing a maintenance check you find a low mass boiler with excessive noise and popping sounds. What could this indicate?

Answer 47

Low flow condition.

Question 48

When checking the combustion air and venting system of a high efficient boiler, you notice the termination is covered in ice. What should be done?

Answer 48

Remove the ice and snow and any debris .

Question 49

Incomplete combustion will cause a carbon build up on the fins of the exchanger. Who should be consulted?

Answer 49

Gasfitter