Improvements in heating systems

摘要

921,137. Automatic temperature control. HEAT TIMER CORPORATION. Sept. 29, 1959, No. 33061/59. Class 38 (4). In a heating system, radiation means adapted for connection with, or disconnection from, a heating fluid supply circuit by means of a thermostatically controlled valve arranged to be operated by a motor-driven cam. As shown, a motor 22 positioning a valve, connecting a radiator in a zone to a hot water supply, is energized from a transformer 44 via switches 28A, 28B in series. The switches are alternately operated by apertures 30, 301 in a gear 25 driven by the motor, the switch 28B being open when the valve is open. A thermostat T tends to maintain the temperature in a zone constant by short-circuiting switch 28B when the temperature is below a desired value to cause the motor to open the valve until the switch 28A is opened. For an excessive temperature the switch 28A is short-circuited by the thermostat and the converse switching sequence occurs.- When the valve is closed arcuate apertures 30A, 30B in the gear 25 open a switch 29 to deenergize a relay 42. Contacts 43 of the relays for the plurality of zones are connected in parallel so that a motor 35, driving a steamcirculating pump 31 is disconnected from a supply P1, P2 where there is no zone valve open The valve can be a plug or poppet valve.