Exam 33: Hydronic Heat

The pressure relief valve ____.

The series loop system is the hydronic system that is found most often, primarily because of the  ____.

Hydronic heating systems are systems in which water or ____________________ carries the heat through pipes to the areas to be heated .

The reason for using zone valves on a hydronic heating system is to ____.

The high-limit control, like the ____________________, is a device that opens and closes its contacts in response to boiler water temperature .

Most residences with modern hydronic heating systems use ____________________ baseboard heat transfer for terminal heating units.

A series loop hydronic system is not desirable for use in a large residence because ____.

Pumps generally have a cast-iron body with the impeller and other moving parts made of ____________________ or nonferrous metals .

A column of water 1 ft high exerts a pressure of ____.

Air in a hydronic system can cause ____.

The more common type of expansion tank is the ____ expansion tank.

The more sections a boiler has, the higher its capacity will be.

It is important to note that the air separator does not remove air from the system .

An automatic air vent controls the airflow out of the system by means of a(n) ____________________, which rises and falls with the amount of air in the system.

A pressure relief valve is set at 30 psig. The valve is constantly opening and flooding the floor. What is causing the relief valve to constantly open?

The low-water ____________________ valve is responsible for deenergizing the hydronic system in the event the level of water in the system drops below the desired point .

Expansion tanks must always be bled from the top until all of the air is removed from it.

A tankless domestic water system provides hot water from a coil in the boiler.

Explain how a centrifugal circulating pump creates flow in the hydronic system .

In hot water hydronic systems, water is heated and circulated through pipes to a heat transfer component called a(n) ____________________ unit .