GB284965A - Improvements in and relating to the ventilation of enclosures - Google Patents

Abstract

284,965. Carrier Engineering Co., Ltd., and Groom, S. L. Oct. 14, 1927. Heating air.-A heater 7, disposed in the air supply duct 3 of a ventilation system, is controlled normally by a thermostat 15 arranged in the enclosure, and in addition a pair of thermostats 18, 19 are provided, one of which causes the supply of heat to be cut off when a predetermined maximum temperature is reached and the other operates to permit the passage of additional heat when a predetermined minimum temperature is reached. The heater consists of coils 7 to which steam is fed by a pipe 8 which is divided into two conduits 13, 14 controlled by valves 10, 11, 12. The valve 10 is normally open and is controlled by the thermostat 18, being adapted to be closed when the maximum temperature is reached. The normal thermostat 15 regulates the valve 11 in the conduit 13 according to fluctuations prevailing in the enclosure. The valve 12 is adapted to be opened by the thermostat 19 when the supply air is at a minimum temperature, and in this case the thermostat 15 may have operated to close the valve 11 due to the heat given off by people in the enclosure. The coil 7 may be divided into two parts 24, 25, Fig. 2, the coil 24 only being used under normal conditions, and the coil 25 coming into operation on the valve 12 being opened by the thermostat 19. The thermostats are adapted to operate the valves through a compressed air system and motors. Specifications 133,897 and 273,069, [both in Class 137, Ventilation], and 276,221, [Class 55 (ii), Gas manufacture &c.], are referred to.