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Furnace Commsioning > Electronic Ignition, Furnace Start Up, System Controls And Schematics > Flashcards

Electronic Ignition, Furnace Start Up, System Controls And Schematics 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

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2
Q

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

A

Flame rectification

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3
Q

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

A

1:4

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4
Q

Why have flame conductivity systems not been used for proving flame

A

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

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5
Q

What is the first step in the sequence of operation for any heating appliance with electronic ignition

A

Call for heat at the thermostat

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6
Q

What is the importance of the connection diagram

A

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

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7
Q

What is the importance of the ladder diagram

A

It shows how the appliance works for troubleshooting

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8
Q

List five parts of a relay

A

Coil
Core
Return spring
Armature
Contacts

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9
Q

List the four most common arrangements for the contacts of a relay

A

SPST NO

SPST NC

SPDT

DPDT

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10
Q

Name the two most common capacitors

A

START

RUN

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11
Q

What is the material called that is used to seperate two plates in a capacitor

A

Dielectric

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12
Q

What activates the pressure switch

A

Inducer Motor

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13
Q

What is flame rectification

A

Process of proving flame

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14
Q

Where is the CPU located

A

Control board

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15
Q

In a cooling unit where is the high pressure switch located

A

Tubing between the discharge side and the condensing coil of the unit

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16
Q

Explain the function of a low pressure switch

A

Monitors refridgeration system

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17
Q

It is considered safe practice to inspect the electrical connections with the power on

T or F

A

False

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18
Q

A typical circuit board on any furnace will have only one voltage

T or F

A

False

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19
Q

What should be checked on the blower assembly when performing start-up

A

Alignment
Secured to shaft
Shipping blocks/brackets removed

20
Q

List 3 acceptable methods to check for gas leaks

A

Test Dial
Leak detector
Electronic leak detector (sniffer)

21
Q

Which direction must venting on the furnace slope

A

Upwards and away from the furnace

22
Q

What is the maximum distance between supports on 636 venting

A

5 feet

23
Q

What should you be looking for when checking duct connections

A

Openings/gaps

24
Q

What should the heat anticipator setting match

A

Amperage draw of the 24 volt circuit

25
Q

What are the reasons for setting manifold pressure

A

To ensure appliance is not overfiring
Can be used to de rate the appliance

26
Q

What are the calorific values for natural gas and propane

A

1000
2500

27
Q

How is temperature rise calculated

A

The difference of the return air temperature and the supply air temperature

28
Q

When do the blower speeds have to be changed

A

If the temperature rise is too low or too high

29
Q

What is dsi

A

DIRECT SPARK IGNITION

30
Q

What is IP

A

Intermittent pilot

31
Q

What is HSI

A

Hot surface igniter

32
Q

How is an ignition system energized

A

By the ignition module or PCB

33
Q

An automatic ignition system uses what flame sensing device

A

A flame rod

34
Q

List the components that can be found in a direct spark ignition system.

A

The ignition module, The ignitor, the flame rod, the wiring, the gas valve.

35
Q

Provide the usual voltage for a system control module.

A

24 volts

36
Q

A system control module provides what functions

A

Energizes the pilot valve and main valve, lights the pilot or main burner, proves the flame, monitors the flame, de-energizes the gas valve.

37
Q

What gas control valve is used on a DSI, IP and HSI?

A

A combination gas valve

38
Q

A redundant gas valve can provide protection against what?

A

The main operator failing in the open position

39
Q

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

A

Direct ignition

40
Q

The function of a flame sensor is?

A

To prove there is a flame present

41
Q

A flame sensor rectifies a AC signal to a microamp DC current.

T or F

A

True

42
Q

On a spark ignition system the gap between the igniter sensor and grounding strap should be?

A

1/8”

43
Q

What is meant by system pre-purge?

A

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

44
Q

What is meant by trial for ignition?

A

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

45
Q

What is meant by retry for ignition?

A

The system will try again to light the main burners and prove a flame.

46
Q

What is meant by system lockout?

A

After one or multiple attempts to light the burners fails. The system will “lockout”

47
Q

What are two things that can be done to reset lockout?

A

Turn off the main power or turn off the call for heat at the T-Stat.

Furnace Commsioning (3 decks)

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