Testing and troubleshooting 4th year

Question 1

List the variety of test instruments that could be used for troubleshooting a furnace?

Question 2

Why would a combustion analyzer be used?

Question 3

A manometer measures gas pressures, what is the unit of measure?

Answer 3

A manometer is a device used to measure the pressure of gases and liquids. The most common unit of measure for gas pressure is pounds per square inch (psi),

Question 4

What instrument measures RPM?

Answer 4

a tachometer is used to measure RPM (revolutions per minute).

Question 5

What does a multimeter have a combination of?

Answer 5

1. Voltage: A multimeter can measure both AC (alternating current) and DC (direct current) voltage levels.
2. Current: A multimeter can measure both AC and DC current levels.

Question 6

What are two uses for a draft gauge?

Answer 6

A draft gauge is a tool used to measure the air pressure differentials inside and outside of a heating appliance.

1. Determining proper ventilation:
2. Troubleshooting:

Question 7

What does AFUE stand for?

Question 8

Explain AFUE.

Question 9

What are the stack temperatures of the following?
a. Standard Eff. ________________________
b. Mid Eff. ________________________
c. High Eff. ________________________

Question 10

CFH stands for:

Question 11

The Calorific Value of:
a. Natural gas: _______________________
b. Propane gas: _______________________

Question 12

What would happen if the furnace is turned off before the LED diagnostics were read?

Question 13

List some of the problems that could arise if there is a pressure switch issue?

Question 14

What measurement is used when checking for the flame sensor current?
___________________________________________________________________________

Question 15

Does the meter need to be in series or parallel with the flame sensing circuit when reading
flame current?
___________________________________________________________________________

Question 16

List the ways an igniter can be checked for proper operation.
___________________________________________________________________________
___________________________________________________________________________

Question 17

What voltage should be at the secondary side of the transformer?
___________________________________________________________________________

Question 18

What does ECM stand for?
___________________________________________________________________________

Question 19

Define the following:
a. Direct Ignition:
_____________________________________________________________________
_____________________________________________________________________
b. Flame sensor:
_____________________________________________________________________
_____________________________________________________________________
c. Intermittent Pilot:
_____________________________________________________________________
_____________________________________________________________________
d. Rectification:
_____________________________________________________________________
_____________________________________________________________________