Red Seal /tq Questions

Question 1

What is another term for 24vac on transformers ?

Answer 1

Control circuit

Question 2

Which colour of wire is used for r on thermostat terminals?

Answer 2

Red/power

Question 3

Max temp setting for high limit switch ?

Answer 3

250 degrees Fahrenheit

Question 4

How are transformers rated for power ?

Answer 4

Va ratings = volt amps

Question 5

Which class are transformers in furnaces ?

Answer 5

Class 2

Question 6

What’s required to perform a closed circuit test ?

Answer 6

Multimeter and thermocouple adapter

Question 7

4 thermocouple tests ?

Answer 7

Open circuit : 17-32mvdc
Closed circuit: 10-17mvdc
Dropout:0.75-6mvdc
Flame response time: 180 seconds

Question 8

What is a draft diverter used for ?

Answer 8

Dilution air (cools products of combustion )

Breaks the stack effect

Question 9

What needs to be done when measuring heat anticipator amperage of the circuit ?

Answer 9

10 wraps of the wire around clamp of the multimeter

Question 10

If your circuit is reading 96vac are u in phase or out of phase ?

Answer 10

In phase
24-120vac
96 is inbetween

Question 11

If your circuit is reading 144vac is-it in phase or out of phase ?

Answer 11

Out of phase
24-120vac
144vac not inbetween

Question 13

What is the recommended size of spark gap on ignition spark ?

Answer 13

1/8” recommended

Question 14

On an hot surface ignition the ignition itself is made of __________ and is very brittle ?

Answer 14

Silicon carbide

Question 15

What is a stronger material for hot surface igniters that are not silicon carbide?

Answer 15

Silicon nitride

Question 16

Why should you not touch hot surface igniters with your fingers ?

Answer 16

Often burns out at that point u touched

Question 17

What to and not to use for cleaning flame rods ?

Answer 17

Use scotch brite pads or 000 Steele wool

No abrasive materials like clothe as it makes scratches and changes ground to flame ratio and system won’t probe flame

Question 18

2 main principles in flame rod detection system ?

Answer 18

Flame rectification
Flame comductivity

Question 19

It’s most important that the areas of the electrodes exposed to the flame be at least __________ ground to flame rod in order for current to be rectified from ac to dc

Answer 19

Minimum. 4:1

Question 20

What is flame rod to ground ratio?

Answer 20

1:4

Question 21

What does rectify mean?

Answer 21

Converting ac to dc

Question 22

What do u call an ignition system when it’s retrying ?

Answer 22

Recycling control ( more than one try for ignition)

Question 23

Wgst is a recycling control ?

Answer 23

Ignition board

Question 24

How long is warm up time on a hot surface igniter ?

Answer 24

17-34 seconds

Question 25

What state are wireing diagrams shown in?

Answer 25

De energized state

Question 26

What does ait call pressure switch ?

Answer 26

Air switch

Question 27

What does Ait call inducer motor ?

Answer 27

Vent motor

Question 28

An hrv is classified as what type of air supply ?

Answer 28

Mechanical air supply (Bath fans are too )

Question 29

Combustion air is classified as what type of air supply ?

Answer 29

Non-mechanical. Fresh air 10ft back from from furnace in return is also non mechanical

Question 30

What else does wire speed control on a welding machine ?

Answer 30

Also controls Amps

Question 31

What current does spray transfer use ?

Answer 31

Direct current electrode positive

Question 32

If you screw the pressure regulator 1 revelotion clockwise (down) what will happen ?

Answer 32

Pressure will increase roughly 1”wc

Question 33

What kind of valve is a gas valve ?

Answer 33

100% safety redundant valve

Question 34

Distance between the grease removal device and the cooking surface shall be as great as possible but not less than ________inches ?

Answer 34

18” (457mm)

Question 35

What is flame rectification?

Answer 35

Ac electrical current that sends a very small current from the furnace electronic board up to the flame rod

Question 36

Where is the cpu located ?

Answer 36

In the electronic control board