Final Test - Power Venters/ Draft Inducers, Ignition Systems, Oil Burners

Question 1

A low limit is a normally _________ switch.

Answer 1

normally open

Question 2

A high limit is a normally _________ switch.

Answer 2

normally closed

Question 3

A L8124A type aquastat used for an oil hot water boiler has a low limit set at 160 degrees and the adjustable differential set at 20 degrees. At what temperature will the circulator turn on?

Answer 3

170 degrees

Question 4

The primary voltage of an oil burner ignition transformer is ________ volts.

Answer 4

120 volts

Question 5

A cad cell should have a resistance between ________ ohms when an oil burner is running properly.

Answer 5

300 to 1600 ohms

Question 6

Resistance of a cad cell in darkness should be over _________ ohms.

Answer 6

20,000 ohms

Question 7

An oil primary control with ignition which stays on through the entire “on” cycle is called:

Answer 7

constant ignition

Question 8

An oil primary control with ignition which turns off when flame is proven is called:

Answer 8

intermittent ignition

Question 9

The _______ must prove there is draft with a field power venter before the main burner will light.

Answer 9

pressure switch

Question 10

The voltage going to the power vent motor is ________ volts.

Answer 10

120 volts

Question 11

A power venter does not shut off when the call for heat is over because it has a ________ timer.

Answer 11

a post-purge timer

Question 12

If you use a CK-92F water heater control kit with a power venter, what is the water heater control?

Answer 12

24 volts AC

Question 13

What is installed on the water heater gas valve to turn on the power venter on a call for hot water?

Answer 13

a pressure switch

Question 14

If you install a draft inducer on a boiler, where does it get mounted?

Answer 14

on the flue/exhaust

Question 15

What is the maximum flue temperature that a Tjernlund draft inducer inlet should have?

Answer 15

575 degrees