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Block 2 > Boiler Trim > Flashcards

Boiler Trim Flashcards

1
Q

What is A?

A

Flow Control Valve

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2
Q

What is B?

A

Line scoop

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3
Q

What is C?

A

Automatic air vent

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4
Q

What is D?

A

Circulator

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5
Q

What is E?

A

Flow Switch

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6
Q

What is F?

A

Low water cut off.

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7
Q

What is G?

A

Temperature Gauge.

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8
Q

What is H?

A

Safety relief valve.

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9
Q

What is I ?

A

Diaphragm expansion tank.

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10
Q

What is J?

A

Pressure reducing valve.

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11
Q

What is K?

A

Backflow Device

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12
Q

What is L?

A

Drain Valve.

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13
Q

What is M?

A

Limit control and Operating control

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14
Q

What is N?

A

Combination Gauge.

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15
Q

What kind of boiler is this?

A

Natural draft boiler

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16
Q

What is this a diagram of?

A

Burner assembly

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17
Q

What is A?

A

Blocked inlet switch

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18
Q

What is B?

A

Air/Fuel valve

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19
Q

What is C?

A

Gas flex hose

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20
Q

What is D?

A

Staged Ignition Solenoid

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21
Q

What is E?

A

Igniter - Injector

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22
Q

What is F?

A

Blower proof switch

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23
Q

What is G?

A

Blower

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24
Q

What is H?

A

Burner plate

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25
Q

What is I?

A

Flame detector

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26
Q

What is J?

A

Oxygen sensor

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27
Q

What is K?

A

Burner

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28
Q

What is the maximum allowable temperature at the boiler outlet in a water boiler.

A

121 c or 250 f

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29
Q

On a water boiler when does a High limit control operate?

A

If the operating control fails.

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30
Q

What is a fluid temperature control used for on a water boiler?

A

As a control safety device to limit the fluid temperature in a boiler.

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31
Q

Where are limit controls wired to?

A

Wired to the gas valve, and close it when the high limit is reached.

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32
Q

What are the 3 most common water boilers?

A

Natural draft boiler

Forced draft modulating boiler

Forced draft modulating condensation boiler

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33
Q

What is the function of a Limit control?

A

Detect any dangerous high temperature condition that may occur in the heating system and prevent operation of the equipment until it is safe to do so.

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34
Q

What is the function of an Operating Control

A

A limit control that is used to maintain a variable condition within a set of desired range of values

35
Q

What is the function of a Combination gauge?

A

Indicates pressure, feet of head, and temperature.

36
Q

What is the function of the Safety relief valve?

A

Protects against excess pressure from thermal expansion.

37
Q

What is the function of a thermometer on a water boiler?

A

Indicates temperature of water n the boiler, at or near the outlet or where the water returns .

38
Q

What is the function of the pressure gauge?

A

Indicates pressure before and after the pump.

39
Q

What is the function of the Flow control valve?

A

Prevents gravity circulation from occurring within the piping system.

40
Q

What is the function of the air scoop?

A

Promotes the elimination of air and other gases from the hot water heating system.

41
Q

What is the function of the automatic air vent?

A

Removes gases from the heating system

42
Q

What is the function of the expansion tank?

A

Allows for continuous expansion and contraction of water within a closed water heating system.

43
Q

What is the function of the Backflow device?

A

Stops reverse flow of boiler water back onto the domestic water system.

44
Q

What is the function of the Pressure-reducing valve?

A

Reduces the city water pressure to a desirable working pressure for closed hydronic heating systems.

45
Q

What is the function of the Circulator- inline circulation pump?

A

Circulates fluid within a how water heating system.

46
Q

If an operating control has a mercury switch how must it be installed?

A

In a level position

47
Q

What must a boiler be equipped with in addition to an operating temperature control ?

A

A safety limit

48
Q

What are the 2 types of switches used in the basic operation of a temperature control?

A

Mercury switch or a micro switch

49
Q

What are the 2 most common sensing elements found on aquastats?

A

Liquid bulb

Capillary tube

50
Q

How is a sensing bulb inserted?

A

Inserted directly into the boiler and sealed with a packing gland and composition disk, or with an immersion well.

51
Q

When can a surface-mounted aquastat be used?

A

If an opening is not provided.

52
Q

What is the adjustable set point for an indoor-outdoor proportional control?

A

21c-60c
70f-140f

53
Q

And indoor-outdoor proportional control has what reset ratio?

A

1:1
Boiler will increase by 1 degree for ever 1 degree outside drops.

54
Q

What kind of sensing element is used in an indoor-outdoor proportional control?

A

2 capillary tubes

One outside and one inside

55
Q

What 3 types of gauges are used in boiler trim?

A

Pressure Gauges

Thermometers

Tridicator/combination gauges

56
Q

What are the 3 types of pressure gauges?

A

Bourdon

Bellow

Spiral

57
Q

What is the most common pressure gauge with the widest range of applications?

A

Bourdon

58
Q

Where must a thermometer be located on a boiler?

A

Must be located so that it will at all times indicate the temperature of the water in the boiler at or near the outlet.

59
Q

Which 2 places must there be a thermometer on a boiler?

A

The supply and return mains

60
Q

How do flow control valves differ from check valves

A

Flow controls use a weighted disc to prevent opening due to gravity of circulation.

61
Q

What does a Boiler fitting do?

A

Separates gases from the water leaving a boiler.

62
Q

When should an air scoop be used?

A

When there is no location for a boiler fitting

63
Q

What is a Micro-Bubble Resorber

A

An advanced line scoop that are fitted with fine screens to which air bubbles adhere and travel upwards to the float-controlled air valve

64
Q

What must be done to Automatic air vents during matinance?

A

Must be isolated from the system to avoid system shutdown or admittance of air into the system.

65
Q

What are the 3 types of expansion tank?

A

Cushion

Diaphragm

Bladder

66
Q

What type of expansion tank has an external sight glass?

A

Cushion

67
Q

What type of expansion tank has no diaphragm or bladder

A

Cushion

68
Q

In what orientation are diaphragm tanks installed?

A

Upside down

69
Q

What are diaphragm expansion tanks pre charged to?

A

12 psi

70
Q

In what orientation are bladder expansion tanks installed?

A

Facing up

71
Q

What are bladder expansion tanks pre charged to ?

A

12 psi

72
Q

What is the most common type of gauge?

A

Burdon tube

73
Q

What pressure would you expect to see in a low pressure steam boiler?

A

15 psig

74
Q

Which type of expansion tank has an external sight glass?

A

Cushion tank

75
Q

Which component does the condensate first exit into in a high efficiency/condensating boiler?

A

Condensate trap.

76
Q

How do you adjust the pressure setting on the pressure relief valve?

A

Replace it or have it adjusted by a qualified technician.

77
Q

What are some signs of poor combustion?

A

Change in flame shape, color or sound.

78
Q

How often should a float type low water cut-off be blown down?

A

Weekly

79
Q

Who can perform the annual maintenance on a Backflow device?

A

Certified cross connection technician.

80
Q

How often should a pressure relief valve be tested?

A

Every 6 months.

81
Q

What should happen if there is a no flow condition when the boiler is operating?

A

The burners shut off to prevent damage to the boiler.

82
Q

What is the purpose of a condensate neutralizer?

A

Reduce the acidity of the condensate

83
Q

What is a way to test the operation of the float type low water cut off?

A

Isolate boiler
Open drain valve
Wait for low water shut off to kick in.

Block 2 (33 decks)

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