Electronic Ignition Systems

Question 1

Interrupted Pilot Ignition System

Answer 1

The main burner and pilot are off during standby

Question 2

Intermittent Pilot Ignition System

Answer 2

The pilot is on when the main burner is on

Question 3

Difference between a dual rod and single rod burner ignition system

Answer 3

Dual Rod: has one rod for ignition and one rod for flame sensing
Single Rod: One rod is the ignitor and the flame sensor

Question 4

Recommended spark gap?

Answer 4

1/8”

Question 5

What are two types of HSI?

Answer 5

Silicone Carbide & Silicon Nitride

Question 6

What is the downside of using flame conductivity as a flame sensor?

Answer 6

Can not tell the difference between a flame or a short circuit.

Question 7

Yellow Tip Flame - Cause

Answer 7

Not enough air/airflow

Question 8

Lifting Flame - Cause

Answer 8

Too high velocity

Question 9

Waving Blue Flame - Cause

Answer 9

Drafts/ Air blowing on burner/ Cracked Heat Exchanger

Question 10

Flashback - Cause

Answer 10

Not Enough Gas Pressure

Question 11

Main Burner Flame too large - Cause

Answer 11

too much gas

Question 12

Noisy Flame - Cause

Answer 12

Too high velocity

Question 13

CO ppm allowed exposure in 8 hrs

Answer 13

50

Question 14

CO ppm fatal in less than one hour

Answer 14

4000+

Question 15

Blower fan speed for heat

Answer 15

Medium/Low

Question 16

Combination Gas Valve includes what 3 components

Answer 16

Solenoid Valve, a diaphragm valve & a pressure regulator

Question 17

What’s included in Connection Wiring diagrams

Answer 17

Colour of the wires, location of components, location of wires

Question 18

What’s included in schematic/ladder wiring diagrams

Answer 18

How the appliance works, helpful when troubleshooting

Question 18

What type of control retries ignition more than once

Answer 18

Recycling control

Question 18

Yellow Tip Flame - Reason

Answer 18

Little primary air, blocked flue/ burner port, dirty orifice, misaligned orifice, orifice too large

Question 19

Lifting Flame - Reason

Answer 19

Too much primary air, burners overfired, orifice too large

Question 20

Waving Blue Flame - Reason

Answer 20

Excessive draft around the burner, cracked heat exchanger

Question 21

Flashback - Reason

Answer 21

Too much primary air, burners underfired, orifice to large or to small, gas valve leaking

Question 22

Main Burner flame too large - Reason

Answer 22

Burners overfired, defective regulator, burner orifice too large

Question 23

Noisy Flame - Reason

Answer 23

Too much primary air, pilots overfired, burr in the orifce