Patent GB-315712-A (GB)
Title: Improvements in heating systems for buildings and the like
IPC: F24D1/00
Filed: 1929-07-13
Abstract: 315,712. Raymond, F. I. July 16, 1928, [Convention date]. Heating buildings.-A heating system for buildings is controlled in accordance with the temperatures of the space heated, the heating medium, and the outside air. The furnace of a hot-water boiler 10, Fig. 1, has the ash-pit door and dampers controlled by a motor 11. A room thermostat 16 may have manual or time adjustment for night and day operation, and may have low and high temperature contacts 17, 18 and a movable contact 19. Another thermostat 20 .has' low and high temperature contacts 21, 22, and a movable contact 23 operated by a Bourdon tube 24 controlled by a bulb 27 in the boiler, and a bulb 28 outside the building or responsive to outside temperature changes. As an example, the heat output may The more than is necessary with the water at 170‹F. and with an outside temperature of 0‹F., and the thermostat 20 may be set to operate at a water temperature between 160‹F. and 170<o>F., the outside temperature being 0‹F. or at a lower water temperature if the outside temperature is higher, the effects of the bulbs 27, 28 being added together. The thermostat 16 may be set to operate between 70‹F. and 72‹F. Fig. 1 shows the position at starting up, both thermostats being on their minimum contacts. When the boiler water reaches its maximum point, contacts 22, 23 are closed and the motor is controlled through circuit 30, 31 to retard the fire. A similar action would take place if the contacts 18, 19 were first completed. The thermostat 20 accelerates the fire when the water cools to 160‹F. and contacts 21, 23 are closed, provided that the room temperature has closed the contacts 17, 19. Thus, either thermostat can retard the fire independently, but both thermostats must be at or below their minimum points to accelerate the fire. The same method may be applied (Fig. 2, not shown) to the control of the oil fuel supply. In another modification, Fig. 3, the connections are such that either thermostat 16, 20 can independently accelerate the fire, but both must function to retard it. A quick heating up is thus ensured, but overheating of the liquid is not prevented by this device. In another modification, Fig. 4, the two systems are combined, and an additional contact plate 45 is provided on the thermostat 20, on which the arm 23 rests except in extreme positions. The connections are such that the fire is retarded when the room thermostat completes the contacts 18, 19 and the thermostat 20 is above the minimum, i.e., on contact plate 45. The fire is also retarded if the thermostat 16 remains on its minimum while the thermostat 20 reaches the high temperature contact 22. Similarly, either thermostat can accelerate the fire independently. The application is also described to hot air supply systems, (Figs. 5 and 6, not shown), to a hot water system heated by multiple burners controlled separately by thermostats in different rooms (Fig 7, not shown), and to the control of the effective radiating surface in a steam or vacuum system (Fig. 8, not shown). The Specification as open to inspection under Sect. 91 (3) (a) describes also the application to a vacuum or vapour system (Fig. 5, not shown). This subject-matter does not appear in the Specification as accepted.