Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Electronic Ignition 305A > 305A/305B/305C > Flashcards

305A/305B/305C Flashcards

1
Q

What is the main difference between an intermittent pilot gas valve and a direct ignition gas valve?

A

The direct ignition gas valve has no pilot connection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

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

A

Flame rectification

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

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

A

1:4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Why have the flame conductivity systems not been used for proving the flame?

A

The system will not distinguish between flame and a short to ground

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What’s the first step in the sequence of operation for any heating appliance with electronic ignition?

A

Call for heat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What’s the importance of the connection diagram?

A

It shows where the wires go and the colour of wires.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the importance of a ladder diagram?

A

Shows how the appliance works for troubleshooting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What device has a capacitor connected to it?

A

Blower motor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Two main principles in Flame rod detection systems are?

A

Flame rectification
Flame conductivity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

In conductivity systems the ground electrode must be at least ____ times that of the flame rod?

A

4 times
4:1 ratio

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Flame rectification is measured in what

A

DC micro amps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the spark gap on an Intermittent pilot spark ignition system?

A

1/8” gap

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What’s the difference between intermittent pilot ignition and an interrupted pilot ignition system?

A

In Intermittent pilot system the pilot is not extinguished after ignition of the main burner

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the different types of electronic ignition systems?

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is DSI?

A

Direct spark ignition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is IP

A

Intermittent pilot ignition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is HSI?

A

Hot surface ignition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

An automatic ignition system uses what for a flame sensing device?

A

Flame rod/ flame rectification

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is the igniter on a HSI made of typically?

A

Silicon carbide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What happens when lockout occurs?

A

De energizes spark ignition and burners

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Adjustable components in a mid efficiency furnace?

A

Blower fan off time delay
Blower fan speeds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

List 5 parts of a relay

A

Coil
Core
Return spring
Armature
Contacts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

4 common arrangements for the contacts of a relay

A

SPST-NO - Single Pull Single Throw Normally Open
SPST- NC - Single pull Single throw Normally Closed
SPDT- Single pull Double Throw
DPDT- Double Pull Double Throw

24
Q

2 Types of capacitors?

A

Run Capacitors
Start Capacitors

25
Q

Material used to seperate 2 plates in a capacitor?

A

Dielectric

26
Q

What activates the Pressure Switch?

A

Pressure switch is activated when the IDM starts turning and creates enough pressure

27
Q

What is flame rectification?

A

It is an AC electrical circuit that sends a small current from the furnace board to the flame rod.
When the flame is established the flame acts as a conductor or path which allows current to flow across from the flame rod to ground burner completing the circuit

28
Q

Where is the CPU located?

A

Control board

29
Q

What way is a ladder diagram read?

A

Left to right

30
Q

What’s HPS stand for

A

High Pressure Switch

31
Q

What’s LPS

A

Low Pressure Switch

32
Q

What is a better HSI?
Silicone carbide or silicone Nitride?

A

Silicone Nitride

33
Q

What commonly use Run Capacitors?

A

Air handler blower motors,
Induced or forced draft fan motors on high efficiency furnaces, condenser fan motors, compressors and pumps for hot water and chilled water

34
Q

Common applications for Start capacitors?

A

Typically only used to start compressors

35
Q

Voltage classification for Run Capacitors?

A

370V and 440V

36
Q

Voltage classification for Start capacitors?

A

125V, 250V and 330V

37
Q

Is it safe to inspect electrical components with the power on?

A

No

38
Q

Typical circuit board on any furnace will only have one voltage ?

A

False

39
Q

List 3 acceptable methods to check for gas leaks ?

A

Test dial
Commercial leak detectors
Electronic leak detector

40
Q

What direction must venting on the furnace slope?

A

Upwards and away from the furnace

41
Q

What the maximum distance supports can be apart on a 636 system?

A

5 Feet

42
Q

What should the heat anticipator be set to?

A

The amperage draw of the 24-volt circuit

43
Q

Formulas for converting gas quantity into BTUh?

A

Hourly consumption =( size of test dial / # secs. 1 revolution) x 3600

BTUh = hourly consumption x calorific value

44
Q

How is an ignition system energized?

A

Ignition module

45
Q

What is the usual voltage for a system control module?

A

24V

46
Q

What gas control valve is used for DIS, IP and HIS?

A

Combination Gas Valve

47
Q

A redundant gas valve can provide protection against what?

A

The main operator failing in the open position

48
Q

Which ignition system energizes only the first main valve to open and allows gas to flow to the pilot?

A

Direct ignition

49
Q

What’s the function of a flame sensor?

A

To prove there is a flame

50
Q

A flame sensor rectifies a AC signal to a _________________

A

Micro Amp DC current

51
Q

What does a system pre purge mean?

A

The inducer motor runs to clear out the vent of products of combustion

52
Q

What does trip ignition mean ?

A

The time it takes to light the main burner and prove there is a flame

53
Q

What does lockout mean?

A

After 1 or multiple attempts to light the burners and it fails system will go into lockout.

54
Q

What are 2 things that can be done to reset Lockout?

A

Turn off main power or turn off call for heat @ TSTAT

55
Q

How should Venting be installed?

A

Venting shall be installed with no dips or sags

Electronic Ignition 305A (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions