Heating I Section#2 Hot Water Boiler Quiz#1

This study session deals with the scope of the heating inspection, as set out in the ASHI®/CAHI Standards of Practice. The session also includes a general discussion on materials, and the heat transfer methods used with boilers. The differences between boilers and furnaces are outlined.

This is a relatively short study session. The estimated completion time for this study session is forty-five minutes.

Objectives
At the end of this study session, you should be able to:

• List two broad systems the inspector must inspect in a heating inspection to meet the Standards.
• List two items the inspector must describe in a heating inspection to meet the Standards.
• List five items the inspector is not required to do or observe in a heating inspection to meet the Standards.
• List two ways we are limited on our summer inspections of boilers.
• List four materials used in boiler construction.
• List and describe three ways heat is moved through a hot water system.
• List ten differences between boilers and furnaces.
• List the advantages and disadvantages of hot water heat.
• List three problems found with boiler heat exchangers.

Explain briefly how we can get superheated water in a hydronic heating system.

Because the system is pressurized, the water can be heated beyond 212F without creating steam. If this water is ever released, a steam explosion can result

Explain briefly why you don't want to drain the boiler water in the summer.

Adding fresh water each fall adds new oxygen to the system. This causes corrosion through the entire system.

How do boilers use conduction to transfer heat from the flame to the air in the room?

Conduction is used to transfer heat from the products of combustion through the metal heat exchanger to the water.

List five advantages of a hot water heating system

1. They provide very even heat.
2. They do not create drafts.
3. They are quieter than forced air furnaces. 
4. They do not circulate odors. 
5. The piping requires less room than ducts. 
6. Boilers are smaller than furnaces for the same heat capacity.

List five disadvantages of a hot water heating system.

1. More costly to install and service compared to forced air furnaces

2. More difficult to add central air conditioning, humidifying and filtering equipment to a home

3. Less selections on the market

4. Radiators take up more spaces in rooms than heating registers

5. A leak in a hot water system usually means water damage. A leak in a supply or return duct does not damage

Copper tube boilers have:

Better heat transfer characteristics, but shorter lifespans than cast iron boilers

Which of the following is a similarity between furnaces and boilers?

High temperature limit switches <selected answer>

Piping

A low level safety device

Backflow preventers

A pressure relief valve

Heat exchanger diagnosis on boilers is easier than on furnaces because the heat exchanger will leak when it has failed.

True

We are required to test hydronic systems for system capacity in the summer.

False

We should test automatic safety controls.

False