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Hydronic Heating

Horizontales
This part of the heating system may well be considered its "heart"; its purpose is to circulate cool water from the system circuit into the boiler and heated water from boiler into the system circuit.
The hydronic heating system is initially filled with cold water to design pressure. Since water expands as it is heated, an area must be provided to compensate for this additional volume. This is done by means of an _________ _____.
This valve is designed to prevent gravity flow of hot water into the heating circuit when the circulator is off.
Water in the heating system contains air in solution that is released as the water is heated. An ___ _____ installed in the supply main removes air from water flowing through the system before it can enter the system circuits.
This valve is used to purge the system of air.
Verticales
This is a gate type valve and is used in conjunction with the bleed valve when purging the system. When closed, it stops water from the zones from going back into the boiler, instead routing it through the bleed valve.
Some systems may have this spring-operated valve installed as an option.
An optional on/off switch located at the boiler.
Vents may be installed at selected high points in the circuit to remove residual air trapped in the heated water.