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Electronic ignition 4th year > Electronic Ignition 4th year > Flashcards

Electronic Ignition 4th year Flashcards

1
Q

What is important for the Sheet Metal Worker to understand effectively when
troubleshooting HVAC appliances?

A

By understanding these factors, sheet metal workers can troubleshoot appliances more effectively, ensuring that systems are repaired correctly and functioning safely

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2
Q

What are the four different ways that an electronic ignition system can be configured for a
heating appliance?

A
  1. Hot Surface Ignition:
  2. Direct Spark Ignition:
  3. Standing Pilot Ignition:
  4. Intermittent Pilot Ignition:
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3
Q

Describe how the ignition process for an interrupted Pilot Ignition System works.

A

. It works by using an electrical spark to ignite a small flame, called a pilot light, which in turn ignites the main burner.

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4
Q

Describe how the ignition process for an Intermittent Pilot Ignition system works.

A

It works by using an electrical spark to ignite a small flame, called a pilot light, which in turn ignites the main burner.
The only difference is that the pilot is not extinguished after ignition of the main burner

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5
Q

On the occasion that a smart valve is used in a gas heating appliance, what is the voltage,
ignition type, and what is lit first?

A
  1. Voltage: Smart valves typically operate on 24-volt AC power.
  2. Ignition type: hot surface ignition,direct spark ignition and intermittent pilot ignition
  3. What is lit first: In smart valves with intermittent pilot ignition, the pilot light is the first to be lit.
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6
Q

What device controls the ignition process and also senses that there is flame through the
flame rod?

A

is called a flame sensor, also known as a flame rectification sensor

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7
Q

What is the recommended spark gap distance?

A

The recommended spark gap is 1/8”

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8
Q

About how many volts are sent through the spark igniter?

A

24- volts

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9
Q

What are some of the disadvantages for using a silicon carbide igniter as part of the hot
surface igniter?

A
  1. Fragility: Silicon carbide igniters can be brittle and can easily break or crack. They are also sensitive to physical damage from handling during installation or maintenance, which can shorten their lifespan.
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10
Q

Describe how the ignition process for a Direct –Spark Ignition System works.

A

It lights the main burner directly,using spark as in the intermittent pilot ignition.

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11
Q

What does the external fuse protect inside a furnace?

A

The external fuse in a furnace is designed to protect the furnace’s electrical components, including the control board, blower motor, and gas valve, from electrical current surges or shorts.

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12
Q

What voltage does the hot surface igniter use?

A

115-volt AC

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13
Q

How long does the hot surface igniter take for it to heat up fully?

A

17-34 seconds

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14
Q

What is the approximate temperature of the hot surface igniter when energized?

A

approximately 2600 f (1427c)

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15
Q

Why should you not touch the hot surface igniter itself with your fingers (silicon carbide)?

A

is very brittle, it will burn out.

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16
Q

When the flame rod needs to be cleaned, what should be used to clean it?

A

use scotch brite pads or 000 steel wool only.

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17
Q

If an abrasive material is used for cleaning of the flame rod then what could happen to the
ratio?

A

will cause a change and the system will not prove flame.

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18
Q

What is the flame sensor to ground ratio?

A

at least 4:1

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19
Q

Why is the ratio needed for flame rectification?

A

to best operate, the larger the ratio of ground area to flame rod area the greater the rectified current.

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20
Q

List the two different principles in a flame detection system.
___________________________________________________________________________
___________________________________________________________________________

A
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21
Q

Which flame detection system is not used today?
___________________________________________________________________________

A
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22
Q

List the parts of the circuit required for flame rectification.
___________________________________________________________________________
__________________________________________________________________________

A
23
Q

What ionizes the current?
___________________________________________________________________________

A
24
Q

What is usually good knowledge when servicing a furnace or heating appliance?
___________________________________________________________________________

A
25
Q

What is the first thing that needs to happen to start the sequence of operation?
___________________________________________________________________________

A
26
Q

Which terminals are used for the call for heat signal?
___________________________________________________________________________

A
27
Q

What are some of the other names that can be used for, “Inducer fan”?
___________________________________________________________________________
___________________________________________________________________________

A
28
Q

What ensures that the inducer fan is in proper operation before the furnace is able to
continue its heating process?
__________________________________________________________________________

A
29
Q

What does the module do when it completes the safe- start check?
___________________________________________________________________________
__________________________________________________________________________

A
30
Q

Once the pilot flame is present, what does the module do next?
___________________________________________________________________________
__________________________________________________________________________

A
31
Q

Describe post purge cycle.
___________________________________________________________________________
__________________________________________________________________________

A
32
Q

When the furnace has completed the heating cycle, what happens next?
__________________________________________________________________________

A
33
Q

When the ignition system fails to ignite properly, the module will wait to clear the
combustion chamber of unburned gas and re-try. This is called:
__________________________________________________________________________

A
34
Q

What are some ways to reset the lockout for trial for ignition?
__________________________________________________________________________

A
35
Q

List the two different types of wiring diagrams that are usually available in HVAC equipment.

A

pictorial (connection), schematic (ladder)

36
Q

Are there any standards set for the electrical symbols and abbreviations in wiring diagrams?
_________________________________________________________________________

A
37
Q

Which type of wiring diagram uses wire colors in its schematic?
_______________________________________________________________

A

connection diagram

38
Q

Do the wiring diagrams show with power or no power?
______________________________________________________________________

A
39
Q

What is the benefit of using a ladder diagram over the connection diagram?
________________________________________________________________________

A

it is most helpful in determining the sequences of operation of the appliance for the purposes of troubleshooting.

40
Q

When working with a thermostat, there are the following terminals: R,W,Y,G,C,W1,W2.
Identify what each letter is used for.
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
__________________________________________________________________________

A
41
Q

What does IDM stand for?

A

induced draft motor

42
Q

What does PRS stand for?

A

pressure switch

43
Q

What voltage is at the “R” terminal when energized?

A

24 vac

44
Q

About how long does it take for the hot surface igniter to warm up?

A

17-34 seconds

45
Q

What is the “Spare” terminal used for?
________________

A
46
Q

What is the average time allowed for the Post Purge?
___

A

30 seconds

47
Q

When replacing a fuse in the furnace, it is best to replace it with:

A

the right size

48
Q

Replacing electrical components in the furnace must be installed as per the manufacturer’s
specifications. (True/False)

A

true

49
Q

What are the fan speeds adjusted to when starting up the furnace?
_________________________________________________________________

A
50
Q

What does DIP stand for?

A

Dual in-line packaged

51
Q

What two methods are normally used to change the fan off delay in the furnace?

A

the electronic control board incorporates small DIP switches or there could be a jumper plug that can be adjusted for different fan off delay setting.

52
Q

Do all ignition control modules (gas fired furnaces) come with Light –emitting diodes?

A

yes

53
Q

What is good about the LED codes in a furnace?

A

good for troubleshooting, diagnose normal condition or a faulty one,

Electronic ignition 4th year (1 decks)

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