GAS RS & TQ

Question 1

how far can a pool heater be from the property line?

Answer 1

18”

Question 2

how far must a direct vent be from a regulator vent?

Answer 2

3’

Question 3

how many supports does a horizontal propane tank need

Question 4

Max pressure in a family dwelling?

Answer 4

2psig

Question 5

max propane pressure in a commercial building

Answer 5

20Psig

Question 6

What type of material for a gasket

Answer 6

neoprene

Question 7

Joining method for tubing underground?

Answer 7

Brazed, flare or mechanical
approved compressio

Question 8

what is the max distance of Metal flex conn for decorative appliance?

Answer 8

2’

Question 9

standard vent termination for gas above roof?

Answer 9

2’

Question 10

What type of pipe is not allowed on gas:

Answer 10

cast iron

Question 11

buried plastic pipe needs what:

Answer 11

tracer wire

Question 12

min bury depth of gas line?

Answer 12

15” unless its a comm drive way then its 24”

Question 13

Higher flammability of propane:

Answer 13

9.6%

Question 14

when does the high limit operate?

Answer 14

an temp rise

Question 15

min. service clearance?

min clearance of b vent?

min clearance c vent?

Answer 15

SER = 24”
B = 1”
C= 6”

Question 16

How does the relief vent of a propane cylinder have to be connected?

Answer 16

in contact with vapour space and lose cap fitting

Question 17

Know distances for vaporizer

Question 18

plastic piping is allowed on liquid propane systems?

T or F

Answer 18

F

Question 19

How far should a rooftop unit be from the edge?

Answer 19

6’

Question 20

What is the minimum length of a dirt pocket:

Answer 20

3” but matches the diameter of piping

Question 21

what must piping have in a corrosive environment?

Answer 21

a coating

Question 22

if piping is less then 1/2” what must it be made of?

Answer 22

Schedule 80 pipe

Question 23

what is the smallest pipe diameter that can be concealed?

Answer 23

1/2”

Question 24

what is regulator freeze up caused by?

Answer 24

high demand

Question 25

If snare flame at a regulator vent limiting orifice:

Answer 25

pin hole in diaphragm?

Question 26

incomplete combustion creates what harmful products

Answer 26

aldehydes

Question 27

why do you drill a orifice two dms size smaller?

Answer 27

because can drill steady enough to have a prefect hole

Question 28

what type of current is use on a rectification signal?

Answer 28

DC

Question 29

Primary air

Answer 29

provides a percentage of the combustion air, but more importantly it controls the amount of fuel that can be burned efficiently.

Question 30

Secondary air

Answer 30

increases combustion efficiency by causing the fuel to completely burn. Atmospheric burners require secondary air, but power burners do not; however, air leaking in at the access or cleanout doors will allow some secondary air to enter the combustion chamber.

Question 31

Excess air | 40% of theoretical air

Answer 31

s supplied to the combustion zone, is air in excess of the air which is theoretically needed for combustion. It is added to ensure each molecule is surrounded by air. Tuning the burner will improve the mixing of the fuel and air, thereby reducing the amount of excess air required. If the excess air is dramatically increased beyond what is actually needed, the result will be lowered flue gas temperatures, leading to lower combustion efficiency.

Question 32

Dilution air

Answer 32

does not directly promote the combustion process but is used to control the stack effect and to reduce the probability that the moisture formed by the combustion of the fuel will condense in the venting system. This will influence the amount of combustion air taken in.

Question 33

Theoretical air

Answer 33

Input BTU/ Calorific Value = CFH Natural Gas CFH Gas X Ratio (10, 24, 31) = Theoretical Air

Question 34

Excess air

Answer 34

40%

Question 35

The amount of air to completely burn twenty cubic feet of propane gas

Answer 35

25 Calorific Value X 20 CU ft = 500 Cu Ft

Question 36

how are Cylinders holding less then 300lbs. of propane filled?

Answer 36

by weight

Question 37

he first indication of poor combustion would be a?

Answer 37

yellow flame

Question 38

A thermocouple must be inserted ____ to _____ into the pilot flame

Answer 38

3/8" to 1/2"

Question 39

The highest combustion efficiency in an appliance is obtained with:

Answer 39

ow stack temperature and high CO2

Question 40

he most common pilot burner found in gas appliances is a:

Answer 40

target type

Question 41

The purpose of a draft hood is to

Answer 41

Allow the entry of dilution air, maintain a zero overfire draft, dry the flue gases

Question 42

Ultimate C02 for natural gas is

Answer 42

12%

Question 43

Ultimate C02 for propane is

Answer 43

14%

Question 44

to correct a lazy flame you must

Answer 44

increase the primary air supply

Question 45

Hot water boiler service clearance (in front)

Answer 45

48" infront

Question 46

Counter flow furnace being installed on a combustible floor must have

Answer 46

a factory supplied base tee

Question 47

domestic gas fired clothes dryer is not allowed to be installed where?

Answer 47

Bathroom

Question 48

Appliance draft hood can be installed and connected to:

Answer 48

B vent, BW vent, a chimney

Question 49

how are bw vent and b vent different

Answer 49

in shape

Question 50

How many gallons of propane will a cylinder with WC (Water Capacity) of 595 hold at maximum filling density

Answer 50

595 X .42 (Specific Density)/5.1 Lbs = 49 Gallons

Question 51

The minimum distance that 1000 USWG tank can be located from a concrete wall is

Answer 51

10'

Question 53

propane tank must be supported by no more the ______ supports

Answer 53

2

Question 54

Propane cylinders stored at a construction site must be stored ________ in a secure area

Answer 54

outside

Question 55

he minimum clearance from combustibles for a single wall connector is _________ inches

Answer 55

6 inches

Question 56

Flame sensing range

Answer 56

1-10 microamps

Question 57

he recommended spark gap on an IPI pilot assembly is a _______ inch gap

Answer 57

1/8 inch

Question 58

A type BH vent would have a stack temp rating of about ______ deg F

Answer 58

125 deg F

Question 59

When a transformer in a system repeatly burns out what might be the issue

Answer 59

wrong VA rating on the transformer

Question 60

VA rating

Answer 60

VA Rating is Voltage X Amperage=VA (Watts)

Question 61

open circuit test ranges

Answer 61

Thermocouple using an open circuit test must be 17-32 mV Thermopile using an open circuit test must be 500-750 mV

Question 62

HWT clearances

Answer 62

Residential Hot water tank min 2” from combustible materials Other Hot water tanks min 6” Clearance Service clearance of 24“ Direct vented requires 3’ from burner side

Question 63

Unit heaters clearances

Answer 63

8’ from floor unless protected 4’ from floor protected Clearance from combustibles is 18 “

Question 64

furnace clearances

Answer 64

Above 1” Sides and rear 6” Front is 24”

Question 65

Boiler clearances

Answer 65

Top, sides, rear 18” Front 48”

Question 66

Natural Gas "Stats"

Answer 66

chemical formula: CH4 CV: 1000 C.A.R.: 10:1 Spcific Grav g/L: 0.6/0.424 Flame range: 5-15%

Question 67

Propane Gas "Stats"

Answer 67

chemical formula: C3H8 CV.: 2500 C.A.R.: 24:1 Specific Grav G/L: 1.5/.51 Flame range: 2.3-9.5%

Question 68

Fluctuating flame is caused by:

Answer 68

plugged vent on regulator

Question 69

a noisy lifting flame is caused by:

Answer 69

too much air (adjust primary air shutter)

Question 70

what are the three types of orifices?

Answer 70

plug cap and adjustable

Question 71

Safe shut off means

Answer 71

pilot stays lit

Question 72

100% shut off means

Answer 72

all the gas is off

Question 73

OHMS law formula

Answer 73

E/IR e voltage i amperage R resistance

Question 74

vent termination from a mechanical air intake is _____ feet

Answer 74

10

Question 75

How is the flame sensing current measured?

Answer 75

between spark and ground