Gas Final

Question 1

How far should a swimming pool heater be from the property line?

Answer 1

18”

Question 2

A direct vent should be how far from the regulator vent?

Answer 2

3’

Question 3

How many supports are required on a horizontal tank?

Answer 3

2

Question 4

What is the max pressure in a family dwelling?

Answer 4

2 psig

Question 5

What is the max propane pressure on a commercial building?

Answer 5

20 psi

Question 6

What type of material uses gaskets?

Answer 6

Neoprene

Question 7

What are the joining methods for underground tubing?

Answer 7

• Brazing
• Flare
• Mechanical approved compression

Question 8

What is the maximum metal flex connector for decorative appliances?

Answer 8

2’ (600mm)

Question 9

What is the minimum distance for non-special vent termination?

Answer 9

2’

Question 10

For a hot water tank with 500 BTUH, what is the air supply duct size?

Answer 10

None is required

Question 11

What is the max setting for a high limit on a forced air furnace?

Answer 11

250 degrees F

Question 12

On a 3000 BTUH appliance, how much air is required for combustion besides excess air and dilution air?

Answer 12

100 BTUH for 1 cubic foot of air

Question 13

What type of pipe is not allowed on gas?

Answer 13

Cast iron

Question 14

What is not allowed regarding piping?

Answer 14

• Piping going through the wall with twin joint
• Piping under foundation wall

Question 15

What do you need when installing plastic pipe underground?

Answer 15

Tracer wire

Question 16

What is the bury depth on a gas line?

Answer 16

15”

Question 17

What is the flammability range of propane?

Answer 17

2.15 - 9.6%

Question 18

How does the high limit operate?

Answer 18

On rise in temperature

Question 19

What is the minimum size for the future on a gas line?

Answer 19

Full size if branch

Question 20

What is the minimum service clearance?

Answer 20

24”

Question 21

What is the minimum clearance of B vent?

Question 22

What is the minimum clearance of C vent?

Answer 22

6”

Question 23

Where is the relief valve on propane located?

Answer 23

Vapour space

Question 24

Are you allowed to use plastic pipe on liquid propane?

Answer 24

No

Question 25

What is the minimum length of a dirt pocket?

Answer 25

3"

Question 26

What must be done in a corrosive environment?

Answer 26

Coated

Question 27

What is the schedule on 1/2 threaded pipe?

Answer 27

80

Question 28

What is the pressure test requirement for a gas system of 200' and 2 psi?

Answer 28

15 psi for 60 min

Question 29

What is the cause of a big pressure drop in a gas system?

Answer 29

Undersized pipes

Question 30

What causes internal regulator freeze up?

Answer 30

High demand

Question 31

What happens if the vent regulator is plugged?

Answer 31

Doesn't open on call for heat

Question 32

What happens when the vent is blocked on a regulator?

Answer 32

Sluggish operation

Question 33

What does the turndown test verify?

Answer 33

Positioning of pilot assembly

Question 34

Who is responsible to show the consumer how an appliance works?

Answer 34

Installer

Question 35

What is the orifice size for 4" WC and 24000 BTUH with 4 burners?

Answer 35

27

Question 36

Why do you drill orifice size two sizes smaller?

Answer 36

Because can drill steady enough to have perfect hole

Question 37

What type of voltage is on an electromagnetic device (pilot) for forced air furnace?

Answer 37

Millivolts

Question 38

What has the fastest response time?

Answer 38

Flame rod or thermocouple or thermopile or generator

Question 39

What can be used on intermittent pilot?

Answer 39

Thermocouple or thermopile

Question 40

What has the highest voltage?

Answer 40

Spark igniter 10-30 KV AC

Question 41

Where do you take the rectification signal?

Answer 41

Flame signal to ground

Question 42

What is the type of regulator on a propane system?

Answer 42

Two stage

Question 43

What type of current is used on the rectification signal?

Answer 43

DC

Question 44

What is the minimum vent height on a unit heater?

Question 45

What engages the relay for the blower motor?

Answer 45

Thermostat