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Steam And Hot Water Heating Review > Steam And Hot Water Heating Review > Flashcards

Steam And Hot Water Heating Review Flashcards

1
Q

What is the energy required to raise the temperature of a liquid without changing its state known as?

A

Sensible heat

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2
Q

What are the two variables which are shown on a pump curve?

A

Flow in US gallons per minute and pressure in feet and head

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3
Q

If an in slab radiant heating system is required to produce for 45650 BTUs per hour with a temperature drop of 20°F. What would be the required flow rate through the tubing in the floor?

A

4.57 gallons per minute

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4
Q

What is the temperature of the air surrounding the equipment known as?

A

Ambient temperature

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5
Q

What is the term given to the flow of air or combustion products or both through an appliance and it’s venting system if it is unassisted by a fan?

A

Natural draft

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6
Q

British thermal unit is defined as the amount of heat required to what

A

Raise lower the temperature of 1 pound of water 1°F

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7
Q

What temperature and pressure are low temperature cast iron boilers limited to

A

250°F and 30 psi G

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8
Q

What are the most common materials for boiler construction?

A

Cast-iron, copper and steel

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9
Q

What are the most newer boilers that allow for gas to condense constructed of?

A

Stainless steel

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10
Q

Which type of boiler can be dismantled to allow it to fit into a boiler rooms through normal doors

A

Cast-iron

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11
Q

What is the name given to the control that shuts down the boilers energy source when temperature in the boiler rises above the normal operating temperature

A

High limit

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12
Q

What are boilers with very little water content called

A

Low thermal mass boilers

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13
Q

Which one of the following is defined as boiler input?
A. the amount of energy consumed by the heat transfer units

B.The amount of energy consumed by the transmission losses

C.The amount of energy consumed by the boiler

D.The amount of energy loss through stack and jacket losses

A

C. the amount of energy consumed by the boiler

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14
Q

Which one of the following could be classified as a high mass boiler?
A. Copper tube boiler.
B. Steel water tube boiler.
C. Copper tub boiler used for domestic water heating
D. Cast-iron sectional boiler.

A

D. Cast iron sectional boiler

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15
Q

Which of these hot water boilers can be used to heat domestic water.
A. Cast-iron sectional.
B. Steel fire tube.
C. Cast-iron condensing.
D. Copper tube.

A

D. Copper tube.

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16
Q

What is the purpose of a boiler operating control?

A

To control the normal temperature range of the boiler

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17
Q

What devices required on a low mass boiler over 400,000 BTUs

A

Flow control valve

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18
Q

What device compensate for the normal expansion and contraction of the water in the system

A

Diaphragm tank

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19
Q

What device is used to maintain a minimum pressure with an system

A

Pressure reducing valve

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20
Q

What is the name of the piping system in which the heating transfer units are part of the piping main

A

One pipe series loop

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21
Q

What is the name of the piping system in which the first heat transfer unit supplied is also the first return returned

A

Two pipe direct return

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22
Q

What is the purpose of a balancing valve?

A

To adjust flow rates to each heat transfer unit

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23
Q

What is the purpose of a “wild loop“

A

To prevent the pump from deadheading

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24
Q

What is the purpose of a zone valve?

A

To allow control of heat in different sections of a heating system

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25
Q

What are the preliminary considerations when locating air removal devices?

A

Temperature and pressure

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26
Q

Why is it important to remove gases from the water in a hot water system?

A

To prevent air binding in the system

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27
Q

Where should you locate air vents?

A

At all high points of the system

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28
Q

What part of a circulator transfers energy to the water

A

The impeller

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29
Q

What functions does a circulator provide in a hot water heating system?

A

It moves water within the system

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30
Q

What is considered the best location for a circulator?

A

Downstream from the compression tank

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31
Q

What causes conventional currents

A

Different fluid densities

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32
Q

What method of heat transfer is utilized by a brazed plate heat exchanger

A

Conduction

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33
Q

Which of the following is a trim item which would never be seen as a steam boiler?
Low water cut off
Pressure relief valve
Diaphragm tank
Automatic water feeder

A

Diaphragm tank

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34
Q

Where is in floor radiant heating not install installed

A

Under cabinetS

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35
Q

How is find tube baseboard rated?

A

BTU per foot per hour based upon supply water temperature, flow rate and entrance air temperature of 65°F

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36
Q

What length of fin would be required for a room with a heat loss of 11,000 BTUs per hour if the Finn had an I will put rating of 550 BTU per feet per hour

A

20 feet

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37
Q

What is a way of reducing noise in a chilled water system?

A

Insulate the piping

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38
Q

When installing heating runs in joint space run the tubing how

A

To the farthest point then provide coverage on the return

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39
Q

The pressure relief valve on a boiler is leaking. What is the culprit?

A

Waterlogged expansion tank

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40
Q

What is a consideration when sizing an expansion tank

A

Working temperature

41
Q

A mixed heating system is operating too hot. What is the best way of fixing it

A

Adjust the mixing valve

42
Q

What are the required fittings to properly isolate a heating/cooling emitter

A

Isolation valves, unions and air vents

43
Q

How is the water added to a cooling tower

A

Through an RPA and an air gap

44
Q

An up fed gas supply to a unit heater requires what

A

Shut off and a union

45
Q

What is the direction of unit heater should face when installed in a garage with an overhead door

A

Down toward the door from above and beside the door

46
Q

When installing a chiller, spring isolators would be used for

A

Vibration dampening

47
Q

The cushion tank in a hydronic heating system must be sized to allow for approximately what percent of water expansion

A

4% of expansion of water

48
Q

What is a cooling tower associated with?

A

A commercial building with a chilled water system

49
Q

What is the purpose of a pot feeder on a hot water heating system?

A

To prevent corrosion of the system components

50
Q

Where would type H copper tube be used?

A

Hydronic heating baseboard tubing

51
Q

The best location for an air scoop on a cooling system is the area of

A

Lowest pressure and highest temperature

52
Q

Where is the fan placed in relation to a cooling coil?

A

Upstream of the coil

53
Q

What would be the cause of a low mass boiler making noise during operation?

A

A low velocity of system fluid

54
Q

Large high amateur draw electric motors are typically what phase

A

Three phase motors

55
Q

What must be checked after a three phase pump is installed in a hot water heating system

A

The rotation of the pump

56
Q

A hot water heating system has three zones. Two of the zones are working fine, but when the third zone valve opens, the circulator does not start and the burners do not fire what is most likely the cause

A

A faulty end switch

57
Q

What part would need replacement if a pump was leaking between the motor shaft and the pump body?

A

The mechanical seal

58
Q

Where is the best location for hydronic heating baseboard wallfin

A

On the outside wall under your window

59
Q

Chrillers typically have what type of piping connections

A

Flange

60
Q

If a cooling coil is installed in a ducting system, what else would be required?

A

Access for servicing and condensate drain

61
Q

What is the purpose of an outdoor reset control

A

It reads the outdoor temperature and adjust the system water temperature automatically

62
Q

When are supplemental heating units installed in conjunction with radiant floor heating systems

A

When the radiant system can’t keep up with the heat loss

63
Q

👺How should a float switch be wired to a pump supplying water to a cooling tower?👺

A

In series with an upstream of the pump

64
Q

When replacing an electric boiler with a gas fire boiler what components would be necessary to add

A

An air supply

65
Q

What would be the most important as a consideration when determining the location of a boiler

A

The venting route

66
Q

Where should a flow switch be located on a hydronic heating system?

A

On the boiler supply

67
Q

How was the water level maintained in a cooling tower?

A

By a float operated valve

68
Q

Where should a low water cut off Be installed for a water boiler

A

2 feet above the top of the boiler

69
Q

What is the minimum rating for a relief valve on a boiler?

A

100% of the rating input

70
Q

What is used to minimize vibration for a cooling tower to the building structure?

A

A spring loaded isolator

71
Q

What type of backflow preventer would be used on a make up water chiller?

A

RPBA

72
Q

What is the minimum recommended backflow protection for a cold water make up line to a boiler system that uses 50% water to 50% glycol mixture

A

RPBA

73
Q

What hot water heating system is easiest for flow balancing

A

2 pipe Reverse return

74
Q

Which of the following would not be important consideration when determining the placement of a boiler
Venting location
Floor drain
Terminations
Visibility from street

A

Visibility from the street

75
Q

Which piece of equipment must be installed if a space heating boiler is to be used to heat domestic water

A

Heat exchanger

76
Q

What would be the correct equipment to be installed on a heat transfer unit?

A

Ball valve, a globe valve, two unions, a vent and a drain

77
Q

What will be installed between a cooling fan coil and a fixed piping which is attached to the building structure?

A

Isolation and balancing valves and a flex connecter with unions

78
Q

What is necessary to be installed on a supply and return piping to a chiller that is mounted on rubber isolation pads

A

Flex connecters

79
Q

Where would the flow switch be installed in the hydronic heating system used on a low mass boiler?

A

On the supply piping from the boiler

80
Q

The purpose of a high limit on a boiler is to

A

Ensure the boilers safe operating temperature is not exceeded

81
Q

What is usually used to prove water circulation through a high mass boiler before the main ignites

A

Nothing

82
Q

How is the water level maintained in a reservoir cooling tower?

A

By a float switch

83
Q

When pouring concrete onto a radiant slab on grade floor panel what must be done

A

Maintain pressure in the pipe

84
Q

Where would low water cut off on a steam boiler system?

A

At the minimum safe water level of boiler

85
Q

What would be the probable cause of a relief valve on an RP discharging intermittently?

A

Upstream pressure fluctuations

86
Q

What could be the result of calcium buildup in a boiler?

A

Flow restrictions, reduced heat transfer, higher fuel bills

87
Q

What should be checked first if one zone of a radiant heated house wasn’t getting heat

A

The zone valve motor

88
Q

How is a steam main installed in a system?

A

Graded down and away from the boiler at 1 inch/20 feet

Supply is graded down and away from boiler to drain codencate goes AWAY from boiler

89
Q

On what principle does a float trap in a steam system work

A

The difference in densities between the condensate and the steam

90
Q

How does a mechanical steam trap operate?

A

Senses is the difference in densities between water and steam

91
Q

Low pressure steam boiler has an operating pressure set at five psi G below the maximum allowed by the A.S.M.E code the pressure control has a differential of four psi G what is the cut in and cut out pressure?

A

Six PSig

92
Q

How are the different gasket rings used in a grooves identified in a piping system

A

By their colour

93
Q

What is the minimum size blowdown of a steam boiler?

A

Three-quarter inch

94
Q

What would be the flow rate for a hydronic heating zone that has a heat loss of 45,000 BTUH and will have a temperature differential of 10°F

A

Nine US gallons per minute

95
Q

A boiler was operating at 15 psi G but is now down to seven psi G what should be the first thing to be checked

A

The pressure relief valve

96
Q

This control used on a hot water heating system. Adjust the boiler water temperature by measuring the outside air temperature.

A

Outdoor reset control

97
Q

This valve can modulate water temperature in hydraulic heating systems

A

Mixing valve

98
Q

Where is the heating/cooling coil located in a relation to the fan of a fan coil?

A

Down stream

99
Q

Two low mass boilers have a common make up water feed, what is required

A

Isolating valves, union, and air vents

Steam And Hot Water Heating Review (2 decks)

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