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that the soft or filtered water supply becomes exhausted. The water lift is now extensively used in connection with the automatic storage-tank system, which is often made use of in supplying soft or filtered water in large quantity. This system is shown in Fig. 324, and in Fig. 325 a sectional view of the automatic storage tank, the action of the latter being as follows:

This tank is supplied by the water lift through a ball cock whose float works in a cylinder A, of small size, placed inside the storage tank. Two other floats, X and Y are connected by a lever seating arrangement to two openings into the top and bottom of the cylinder F. Whenever the water falls below the level slightly above C, the float Y falls and opens the lower opening, through which the water in A escapes, causing the float F to drop, this action causing the ball cock to open, and also relieving the pressure on the cut-off shown in Fig. 326. The lift then starts into operation, forcing water up into the tank until the water reaches the level B. When this level is reached the float X is raised, thus opening the upper inlet into A, filling the latter with water, and raising the float F, which shuts off the ball cock.

The pressure of the water in the pipe between the lift and the tank is sufficient when the ball cock closes to close the automatic cut-off, which results in cutting off the water pressure from the lift. The water lift remains inactive until enough water has been drawn from the tank to bring the water level down to C again. By the use of the valves A and B, water from the city mains may be delivered to the fixtures when the regular supply is for any reason cut off. A modification of this system is often found in high city buildings in which the public water supply is not of sufficiently high pressure to supply the upper floors. In this system the lower floors are supplied by city pressure in the ordinary manner, while the upper floors are supplied from the automatic storage tank in connection with the water lift. It will be seen that under these conditions, the city pressure being the operating power and also the supply that is to be pumped, the supply to the lift and the suction must each be connected to the public water supply system. There are several other systems of supply, to which the water lift may be applied, which might be illustrated and described, if space permitted.

The advantages of the water lift are many, among them being the fact that its operation is automatic, requiring no attendant and little attention; it uses comparatively little water in operating; the action of the lift is comparatively noiseless, and there is little wear and tear on the working parts.

CHAPTER XXVIII

MULTIPLE CONNECTIONS FOR HOT-WATER BOILERSRADIATORS AND COILS HEATED BY RANGE BOILERS

WHILE the large majority of range connections are very simple, involving no novel features, very often conditions and requirements arise which alter the matter entirely, often producing very difficult problems. Among the problems constantly arising, are those which require the connection to the same boiler of two or more ranges, coils, or heaters, and the supply from the hot-water system of heat for radiators and coils. When these multiple connections are used on the kitchen range, the conditions are generally such that the range alone furnishes sufficient heating capacity for the boiler, the additional heating capacity being needed only during the colder months.

These facts necessitate the making of connections in such a way that the boiler may be heated properly by the several heating surfaces together, or by either of them alone. A combination such as mentioned above which is often demanded, is to be seen in Fig. 327, in which a coil radiator on the floor above the range boiler is required to be heated, this additional service making it necessary to connect a coil in the furnace to give additional heat when the heating coil is being used. The best method under the circumstances, is to carry the flow pipe from the furnace coil directly to the top of the heating coil. This method delivers the water to the radiator before it has cooled to any extent, and gives the heating coil more power than other methods of connection would. A vent on the coil is necessary to prevent it from becoming air bound.

The return from the coil is carried into the return from the range boiler to the range, and a connection made from this pipe into the return of the furnace coil.

There is nothing about the connection described to interfere in any way with the regular work of the boiler in supplying hot water to the fixtures of the house.

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FIG. 327.-Horizontal Boiler Heated by Furnace Coil and Coal RangeBoiler Heats Coil on Floor Above.

Valves on the flow and return of the furnace coil will enable the cutting out of the coil from the rest of the system when the furnace is no longer in use.

Another common requirement is the heating of a radiator by the hot-water supply, when the only heating surface is that of the

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range. The great objection to this is that too much is often expected of such a connection, and also that it becomes a detriment sometimes to the regular work of the boiler. A small boiler heated by a small range should not be expected to provide both a hot-water supply and radiation.

A connection of this nature is to be seen in Fig. 328. A feed

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