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Line E > Line E ALL > Flashcards

Line E ALL Flashcards

1
Q

Referring to the image below, what must be done to create a proportioning regulator with the use of the regulator shown?

A

Cross-connect an impulse line from downstream of the combustion air control valve to the top of the regulator diaphragm

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2
Q

When an impulse line is used for a proportional regulator system, what is the minimum pipe diameter the line should be installed from the shaft of the combustion air control valve?

A

5 Pipe diameters

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3
Q

When an impulse line is used for a proportional regulator system, what is the minimum pipe diameter the line should be installed from any pipe tee or elbow (change in direction)?

A

3 Pipe diameters

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4
Q

If it is absolutely necessary to locate the connection of an impulse line less than the recommended pipe diameters downstream of the combustion air control valve, how should the hole be drilled in the pipe?

A

Parallel to the to the shaft of the valve on the side of the pipe

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5
Q

How should a cross-connection impulse line from the combustion air to the regulator be installed?

A

With no dips in the line to avoid trapping water and pitched towards the combustion air line

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6
Q

Referring to the figure above, what is the purpose of the limiting orifice?

A

t limits gas flow to the maximum burner rate

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7
Q

Referring to the figure above, how is low fire adjusted and set?

A

By adjusting the spring in the regulator

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8
Q

Referring to the figure above, what can be done to correct the regulator action affected from variable combustion chamber pressures or any combustion chamber pressures higher or lower than the room pressure adjacent to the regulator?

A

An impulse line can be cross-connected from the combustion chamber to the air/gas ratio regulator

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9
Q

For nozzle mix burners, when is a cross-connected impulse line from the regulator’s vent to the main combustion air line required?

A

When the minimum gas inlet pressure exceeds the maximum air pressure by 3.5 or more inches water column

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10
Q

If the minimum gas pressure at the proportional regulator inlet is not more than the maximum air pressure at high fire, what can be done to compensate for this?

A

Install a two-pipe bleeder and set it so the maximum impulse pressure is 4 iwc less than the gas inlet pressure

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11
Q

Referring to the figure below, what type of actuator is used to drive the vent damper?

A

Linear

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12
Q

Referring to the figure below, what type of actuator is used to drive the vent damper?

A

Rotary

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13
Q

When an automatic flue damper used on an appliance equipped with direct-spark ignition falls fully open upon loss of driving medium, the fuel supply to the appliance needs to be shut off.

A

False

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14
Q

What type of tubing is used to connect a differential pressure transducer used to control a damper actuator to the flue stack probe?

A

Silicon

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15
Q

What is the typical maximum distance a differential pressure transducer used to control a damper actuator should be connected to the flue stack probe?

A

6 feet

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16
Q

Referring to the figure below, What should distance ‘A’ be to improve accuracy?

A

3 times the vent diameter

17
Q

If a CO sensor is used in a boiler room, how high above the floor should the sensor be mounted?

A

4 to 6 feet

18
Q

When CO sensors are installed in an 28,250 ft2 boiler room, a total of how many sensors are required?

A

4 (7500sqft per)

19
Q

What Category appliance has nonpositive pressure and a temperature above 140°F (60°C)?

A

Category I

20
Q

What Category appliance has positive pressure and a temperature below 140°F (60°C)?

A

Category IV

21
Q

What Category appliance has positive pressure and a temperature above 140°F (60°C)?

A

Category III

22
Q

What Category appliance requires venting that is made of material that is intended to resist corrosion from condensing?

A

Category II & IV

23
Q

What Category appliance has nonpositive pressure and a temperature below 140°F (60°C)?

A

Category II

24
Q

What Category appliance requires venting to be sealed and pressure tight?

A

Category III & IV

25
Q

What is that maximum temperature of 316L stainless venting?

A

550°F

26
Q

What temperature can high temperature silicone go up to?

A

2000°F

27
Q

A flue vent can be supported by the appliance it serves.

A

False

28
Q

What is the typical grade for horizontal flue venting?

A

1/4” per foot

29
Q

How should the flue venting be graded for a condensing type appliance when running the vent horizontally to the outdoors?

A

Towards the appliance

30
Q

To maintain the flow of condensate in a condensing appliance’s flue venting, a horizontal change in size of the venting should be done with what type of increaser?

A

Eccentric type

31
Q

When changing the size of vertical venting, it should normally be done with what type of increaser?

A

Concentric type

32
Q

What is used on flue venting guy wires to allow for vent expansion and contraction without stretching the guy wires?

A

Spring loaded turnbuckles

Line E (4 decks)

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