Fourth Period Gas Labs 1 And 2

Front 1

After the igniter is powered , why does it take so long for the main burner gas to come on?

Back 1

To allow the igniter to reach main operating temperature?

Front 2

A hot surface ignition system energizes and the igniter and turns on main burner gas, the main burner lights but goes out after a brief period .

What is wrong with this module?

Back 2

The flame is not being proved

Front 3

Can a continuous trial ignition modular be used on propane?

Back 3

No

Front 4

What happens if the 24 volt power supply leads are reversed on the universal module?

Back 4

The module will lock out and flash a code

Front 5

What is the advantage of a combined igniter/sensor over separate ones?

Back 5

There is no distinct advantage over one another

Front 6

What is the average distance for a spark gap for a DSI system?

Back 6

1/8”

Front 7

What is the average spark gap for an IP system?

Back 7

1/8”

Front 8

What is the difference between an IP and DSI system?

Back 8

The DSI system has no pilot

Front 9

What nominal voltage should be present at the MV terminals when the unit is firing?

Back 9

24 volts ac

Front 10

What type of current is returned to module as a flame current?

Back 10

DC micro amps

Front 11

What voltage is supplied to the module for the gas valve?

Back 11

24 volts ax

Front 12

What voltage is supplied to the module for the hot surface igniter?

Back 12

Line voltage ac

Front 13

When replacing ignition modules what is the most important factor?

Back 13

The parameters such as the lock out and trials for ignition must match.

Front 14

When taking the flame current on a a working ignition system, the module sparks until lock out occurs . You have checked that the meter is set up and connected to the circuit properly. What could cause the circuit to suddenly stop working?

Back 14

The fuse in the meter is burnt out.

Front 15

Why is proper grounding of an ignition module so important?

Back 15

This path proves the flame

Front 16

Why is there a delay between powering the module and igniter warm up period?

Back 16

To allow for a brief pre purge cycle

Front 17

A relay has all the contacts connected for use. How many power ( hot) wires would be connected to the relay?

Back 17

Three

Front 18

A relay has the following rating;

24/115 vac -1725 VA. What is the coil voltage ?

Back 18

24 volts AC power

Front 19

How can the max amount of current be determined for the relay contacts?

Back 19

Divide the VA rating by the contact voltage rating

Front 20

How many contacts switches are are in the relays used in this lab?

Back 20

2 NO and 2 NC

Front 21

How much amperage could the contacts handle on 115 vac?

Back 21

15 amps

Front 22

If the coil of the relay was energized but the device connected to the contacts did not activate , what would most likely be the cause?

Back 22

The relay coil has burned out

Front 23

What type of control would a relay be?

Back 23

A primary control

Front 24

If the relay rating is 24/115Vac- 1725 VA, what is the maximum voltage allowed for the contacts?

Back 24

115 volts of AC power

Front 25

What minimum gauge wire would be used to connect 115 vac devices to the relay contacts

Back 25

14 gauge

Front 26

Why would a relay need to be installed in a wiring circuit?

Back 26

To allow one voltage to control another voltage