The expansion tank provides a means of removing the air from the system as well as provides ____.

• water for the domestic hot water coil

• a space for the water expansion and contraction with water temperature changes

• a space for excess water from the supply source

• All of the above.

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

• 0.277 psig

• 0.299 psig

• 0.433 psig

• 14.696 psig

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

• compression

• standard

• restricted

• diaphragm-type

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

• allow different areas of the structure to maintain different temperatures

• reduce the chance of a water leak

• prevent unused parts of the house from getting warm, and wasting energy

• Both a and c.

Air in a hydronic system can cause ____.

• reduced water circulation

• increased water concentration

• corrosion

• Both a and c.

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 water-regulating valve is broken.

• The system is overfiring.

• The system needs to be calibrated.

• The system requires a new boiler.

A high-limit control on a hot water boiler is needed to ____.

• regulate the amount of water to each section of baseboard

• regulate the water in the supply line to the boiler

• balance the water flow rate in the piping system

• protect the boiler against excessive water temperatures

The pressure relief valve ____.

• regulates the pressure of the water in the supply line

• is set to relieve the pressure in the boiler below its maximum design pressure

• shuts the boiler off if the water temperature gets too high

• relieves the pressure in the expansion tank

An expansion joint is a device used to ____.

• prevent damage between boiler sections

• enlarge the expansion tank in the system

• allow for expansion and contraction of the loop piping with water temperature changes

• connect the manual vent into the system

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

• all of the heated water will flow to all rooms

• some rooms will overheat before other rooms are warm

• it is difficult to install and maintain

• Both a and b.