Heating I Section#1 Furnace - Gas and Oil Quiz#10

This study session deals with problems found in high-efficiency furnaces.

The estimated completion time for this study session is sixty minutes.

Objectives

• At the end of this study session, you should be able to: List and describe the eight common problems found with high-efficiency furnaces.
• Outline the basic testing procedures for a high-efficiency furnace.

List 3 common induced draft fan problems.

1. Damage

2. Worn bearing

3. Inoperative

List 4 concerns with mid or high-efficiency furnace vents.

1. Inappropriate materials

2. Poor location for termination

3. Mechanical damage

4. Inadequate combustible clearance (mid-efficiency furnace only)

5. Improper slope or support

List 5 problems commonly found with condensate systems.

1. Blocked

2. Leaking

3. Poor discharge location

4. No neutralizer bath

5. The neutralizer is clogged

List 5 reasons why an electronic ignition system may not work

1. No electrical power
2. Loose connections
3. Poor electrical ground
4. No spark
5. Flame sensor fails to detect flame
6. Hot surface igniter cracked

List 8 common conditions you may find with mid or high-efficiency furnaces.

1. Vent dampers stuck open or closed
2. Ignition problems
3. Heat exchanger problems
4. Condensate problems
5. Induced draft fan problems
6. Venting problems
7. Differential pressure switch problems
8. Spillage switch problems
9. Poor outdoor combustion air intake location

What is the purpose of the copper wire running across the front end to the heat shield in a condensing gas furnace?

This is the spillage switch. It detects the heat from any spilling combustion gases and shuts the furnace off.

Why is a neutralizer sometimes required by local authorities?

The condensate is slightly acidic, so some jurisdictions require neutralizers to protect sewer piping.

Can leakage of condensate out of the induced draft housing cause corrosion problems with the primary heat exchanger?

No

It is impossible for a vent damper to fail closed.

False