Gas Equipment & Large Boiler 248 CMR 7.00

Question 1

Burner assemblies and all component parts shall be installed according to the ______.

Answer 1

manufacturers instructions and shall be properly and firmly secured in place to maintain correct alignment in normal use.

Question 2

A low-water cutoff may be bypassed for what reason?

Answer 2

for blow down purposes only.

Question 3

Linkage for controlling air and gas input rates are designed to ______.

Answer 3

reliably maintain correct air-gas ratio.

Question 4

What is the primary function of a boiler limit control?

Answer 4

to prevent excessive steam pressure in a steam boiler or excessive temperature or pressure in a hot water boiler.

Question 5

When shall combustion control be provided?

Answer 5

for burners with a firing rate of 2,500,000 BTUs per combustion chamber per hour and over

Question 6

An electric ignition system shall ignite only…?

Answer 6

a pilot

Question 7

What shall an air shutter be capable of?

Answer 7

being readily adjustable to any desired setting and securely locked to prevent accidental change in setting.

Question 8

A pressure-operated safety shutoff valve shall close…?

Answer 8

upon failure of its operating pressure

Question 9

How close to the entrance of a gas train must the gas shutoff be?

Answer 9

within 6 feet

Question 10

An electrically operated safety shut-off valve shall not _____

Answer 10

depend on electricity to shutoff the gas supply

Question 11

Natural and mechanical draft systems with continuously burning pilot(s) capable of igniting any gas flowing from the main burner shall, upon demand for heat, ______

Answer 11

prove all interlocks

Question 12

Natural draft systems with intermittent pilot or interrupted pilots, upon demand for heat shall ______

Answer 12

1.) prove all interlocks
2.) prove open for at least 90 seconds

Question 13

Gas main pressure regulators and gas pressure interlocks. Each burner assembly shall be equipped with a ___(A)___ main gas pressure regulator that will regulate within ___(B)___.

Answer 13

(A) listed
(B) plus or minus 10% of the operating pressure at all firing rates.

Question 14

Except where zero governors are used in connection with air-gas mixers, all main gas pressure regulators shall be ______.

Answer 14

vented independently to a safe outdoor location

Question 15

Vent lines from main gas pressure regulators shall not be connected into a ___(A)___ with the bleed line from gas operated ___(B)___.

Answer 15

(A) common line
(B) diaphragm valves or from pressure relief valves

Question 16

What 3 materials can be used for vent lines?

Answer 16

1.) steel
2.) wrought iron pipe
3.) Corrugated stainless steel tubing (CSST)

Question 17

Vent lines shall extend no less than ______ above the roof surface.

Answer 17

18 inches

Question 18

vent lines shall be run to the outside using ___(A)___ and shall not be ___(B)___.

Answer 18

(A) shortest practical route
(B) trapped or installed in a manner that restricts air flow

Question 19

CSST vent lines shall transition to steel no less than ______

Answer 19

one foot inside the building

Question 20

Vent lines that terminate a building opening shall be located no less than ______

Answer 20

4 feet away from any building opening or air intake.

Question 21

Name 3 things for pilot testing.

Answer 21

1.) pilot burner shall be lighted and adjusted to manufacturers instructions
2.) pilots shall not deposit carbon
3.) when bleed pilots are used the discharge shall be in a fixed position

Question 22

complete written or printed instructions including wiring diagrams shall be ______.

Answer 22

supplied and made conveniently available or posted in permanent form near the equipment.