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 to the pump, regulates the level of water in the receiving tank. As soon as the water in the tank rises above the proper level the pump is started by the float, and when it falls below this level the pump is stopped.

Figure 8 represents an arrangement with an open heater. The steam connection is precisely similar in principle, but a different arrangement of details is indicated, the valves being lettered to correspond with those in Figure 7. The returns are run into a receiving tank similar to the other arrangement, but this tank is connected directly to the heater, and practically forms a part of it. The automatic float which controls the operation of the pump is generally, in such cases, connected directly on to the heater, as indicated in the governor marked D.

Steam Heating and Ventilation - Figure 7.png

Figure 7—Arrangement with Pressure Heater.

In Figure 8, on the left of the heater, is indicated another float governor, E, which is frequently attached to heaters of this character. This operates on the cold-water supply. In this connection it will be noted that frequently in moderate weather only a portion of the exhaust steam is needed to heat the building, the remainder escaping through the back-pressure valve. In such cases it is necessary to make up the loss of water by taking a certain amount from the city mains or other source of supply. With the open type of