Pilots

Question 1

The four main categories in which pilot burners are classified are

Answer 1

Continuous , expanding , intermittent and interrupted

Question 2

Continuous pilots are also known as

Answer 2

Standing pilots

Question 3

Expanding pilots are like continuous pilots but

Answer 3

The flame is much smaller size

Question 4

An intermittent pilot is

Answer 4

Only ignited when there is a call for the main burner ignition

Question 5

Interrupted pilots are like intermittent pilots but

Answer 5

But the pilot flame extinguishes when the burners are lit

Question 6

A pilot burner is usually

Answer 6

Ignited manually (you) or by a spark ignition device activated by a control on the appliance

Question 7

Pilot burner designs include

Answer 7

Arrayed pilots , non aerated pilots and post aerated pilots

Question 8

When a burner is lit you want the flame

Answer 8

As blue as possible

Question 9

Aerated pilots allow

Answer 9

Primary air to mix with gas for the pilot to light

Question 10

Pilot orfices for natural gas are usually what Color

Answer 10

Silver metallic Color

Question 11

Propane orfices are what Color

Answer 11

Brown black or dark brass Color

Question 12

Non aerated pilots use what to achieve combustion

Answer 12

Secondary air

Question 13

Aerated pilots are mainly found on

Answer 13

Gas clothes dryers and gas cooking ranges

Question 14

A post aerated pilot is most commonly found in

Answer 14

Residential and light commercial gas appliances

Question 15

Aerated pilots are also called

Answer 15

Incinerating pilots because they burn off any lint or dust present In the air

Question 16

The primary functions of a pilot is

Answer 16

To ensure satisfactory ignition of the main burner at all times

Question 17

Most pilot burners will have a secondary function and that is the activation of a

Answer 17

Flame failure device

Question 18

The secondary function of a pilot is to

Answer 18

Operate the flame failure device by heating a sensor

Question 19

On most residential appliances a fixed orfice and adjustable needle valve

Answer 19

Control the pressure and volume of gas going to the pilot

Question 20

The needle valve is usually incorporated in

Answer 20

The safety control valve

Question 21

Safe hookup is

Answer 21

The automatic safety control of the gas supply limited to the main burner

Question 22

A safe hookup cannot be used with what gas

Answer 22

Propane because it is not lighter than air

Question 23

A 100% safe hookup shut off

Answer 23

Gas to both the main burner and the pilot unlike the safe hookup

Question 24

Thermopiles consist of several

Answer 24

Thermocouples connected in a series

Question 25

Thermopiles are commonly referred to as

Answer 25

Power piles

Question 26

A thermopile should always

Answer 26

Be replaced with the same milli voltage output as the one that was removed

Question 27

The power unit is energized by the thermocouple or thermopile and holds the

Answer 27

Safety gas valve open or safety switch closed

Question 28

Once the pilot is lit is generally takes how long for the thermocouple to heat up

Answer 28

30-60 seconds

Question 29

All propane systems must be

Answer 29

100% safe hookup because propane is heavier than air and does not dissapait quickly in air

Question 30

Adjust the pilot flame so the thermocouple produces

Answer 30

17 to 32 milli volts

Question 31

Pilot flames should only impinge

Answer 31

3/8 to 1/2 inch of a thermocouple

Question 32

A Eco or energy cut off or high limit switch is a temperature activated switch that acts as a high limit to turn

Answer 32

Off the supply to gas in the event of overheating

Question 33

Thermopile voltages on an open circuit produce voltages up to

Answer 33

250 Mv to 1000 milli volts ( 1 volt )

Question 34

Thermocouples can produce an electrical current flow up to

Answer 34

32 milli volts

Question 35

The pilot flame should light the main burner within

Answer 35

4 seconds

Question 36

Excessive heat on the thermocouple will

Answer 36

Burn out the thermocouple

Question 37

Acceptable range on a chart for a thermocouple is

Answer 37

Open circuit 17mv to 32mv
Closed circuit 8mv to 17 mv

Question 38

Response time is the time it takes the thermocouple to cook enough to cause the

Answer 38

Electromagnet on the power unit to dr energize and cut off the gas flow

Question 39

The response time shall not exceed ….
Seconds for standing pilot appliances up to 400 MBH

Answer 39

180

Question 40

The drop out test is a closed circuit test that takes a reading of the milli volts when the

Answer 40

Plunger is released by the electromagnet

Question 41

A turn down test is conducted to ensure that the pilot will

Answer 41

Ignite the main burner when it is reduced in size that will continue to heat the thermocouple enough to prevent drop out

Question 42

Thermopile ranges for open circuit and closed circuit

Answer 42

540 mv to 800mv

Question 43

A lazy yellow flame is caused by

Answer 43

Dirty lint screen or primary air opening or Orphis is to large

Question 44

A waving blue flame is caused by

Answer 44

Excessive draft at the pilot
Location

Question 45

Small blue flame is caused by

Answer 45

Low gas pressure , clogged pilot burner orfice or clogged pilot filter