Line E Sensing Line Installation

Question 1

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

Answer 1

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

Question 2

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?

Answer 2

5 Pipe diameters

Question 3

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)?

Answer 3

3 Pipe diameters

Question 4

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?

Answer 4

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

Question 5

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

Answer 5

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

Question 6

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

Answer 6

t limits gas flow to the maximum burner rate

Question 7

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

Answer 7

By adjusting the spring in the regulator

Question 8

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?

Answer 8

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

Question 9

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

Answer 9

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

Question 10

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?

Answer 10

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