Electronic Ignition, System Controls And Schmatics

Question 1

Are gas valve considered a safety?

Answer 1

100% saftey reduntant valve

Question 2

Diaphragm inside gas valve and regulars have a bleed or vent weather it’s external internal. (True or false ?

Answer 2

True

Question 3

Main 4 electronic ignition configuration?

Answer 3

Intermittent pilot useing spark
Intermittent pilot using hot surface
Direct ignition using spark
Direct ignition using hot surface

Question 4

Diffrence between interrupted and intermittent pilot ignition systems ?

Answer 4

Intermittent pilot is not extinguished after ignition of main burner

Question 5

Difference between dual rod and single rod pilot burner ignition systems ?

Answer 5

Dual you have flame sensor and spark igniter and single rod has one rod that does both

Question 6

What is an hsi made out of ?

Answer 6

Silicone carbide (brittle)
Silicon nitride (stronger)

Question 7

Diffrence between direct spark ignition and pilot ignition?

Answer 7

Pilot ignition proves the pilot flame before turning on the main burner gas and direct spark ignition turns on the main burner gas, lights the main burner then proves the flame

Question 8

What happens if your fingers touch the hsi ?

Answer 8

Will often burn out at that point

Question 9

What should you never use to clean flame rod and why ?

Answer 9

Aggressive cleaning items such as sand cloth.

Leaves deep scratches in rod and will cause change in ground to flame rod ratio and the system will not probe the flame

Question 10

What are the two types of flame rod detection systems ?

Answer 10

Flame rectification
Flame conductivity

Question 11

Flame conductivity ratio?

Answer 11

Ground to rod 1:1

Question 12

What is the flame rectification ground to flame rod ratio ?

Answer 12

4:1
Ground 4 flame rod 1

Question 13

What’s a example of a recycling control

Answer 13

Ignition board

Question 14

What does recyling control mean

Answer 14

More than one try for ignition

Question 15

What is the only way you hsi will read 24vac?

Answer 15

Smartvalve

Question 16

What kind of wireing diagrams are in furnaces ?

Answer 16

Pictorial (connection)
Schematic (ladder)

Question 17

What state are wire diagrams shown in ?

Answer 17

De energized state

Question 18

What does it mean if wireing diagram has larger lines for wires ?

Answer 18

Powers on most likley in stand by mode

Question 19

Where do u find trouble shooting guides ?

Answer 19

Available in installation and owner Manuel’s

Question 20

What is a a dip switch ?

Answer 20

Dual in line packaged switches

That can be adjusted for different fan off delay settings

Question 21

What do light emitting diodes (LEDS) mean on control boards ?

Answer 21

They flash codes to tell you what is wrong with the system

Question 22

Shay would happen If you screw the pressure regulator 1 reviloution clockwise (down)?

Answer 22

Pressure would increase roughly 1” wc

Question 23

When using electronic ignition what is the process of proving the flame called ?

Answer 23

Flame rectification

Question 24

What is the minimum flame rod to ground electrode area that is immersed in the flame ?

Answer 24

1:4
Rod to ground

Question 25

What is the importance of the connection diagram ?

Answer 25

Shows where the wires go and the colours of each wire

Question 26

What is the importance of the ladder diagram ?

Answer 26

Shows how the appliance works for trouble shooting

Question 27

What state are relays shown in on schematic diagrams ?

Answer 27

De Energized state and the contacts are to be in Thier normally open positions

Question 28

How do u figure out what contacts on a relay are the coil without a diagram ?

Answer 28

Useing a multimeter reading ohms finding the highest resistance that will be the coil

Question 29

Two types of capacitors ? And where u would see them ?

Answer 29

Run (power) - single phase motors like blower motors induced or forced draft fan motors condenser fan motors Start (motor starter) - limited to compressors only used to start compressors

Question 30

5 parts of a relay ?

Answer 30

Coil Core Return springs Armature Contacts

Question 31

Four most common arrangements for the contacts of a relay ?

Answer 31

Spst- single pull single throw normally open Spst - single pull single throw normally closed Spdt- single pull double throw Dpdt- double pull double throw

Question 32

What is the material called that is used to seperate the two plates in capacitors ?

Answer 32

Die electric

Question 33

What activates the pressure switch ?

Answer 33

Idm does and creates enough pressure to force the diaphragm to move to micro switch closing it

Question 34

In a cooling unit where is the high pressure switch located ?

Answer 34

In the tubbing between the discharge side of compressor and the condensing coil

Question 35

Explain function of a low pressure switch

Answer 35

Monitors refrigeration system for a loss of refrigerant charge May also be helpful in stoping the evaporator indoor coil from freezing up due to a dirty filter or low air flow over the coil