ES342768A1 - Storage heater - Google Patents

Abstract

In an electric storage heater of the type in which the maximum core temperature is determined by an adjustable thermostat which also receives heat from a control heater controlled in accordance with the temperature outside the space to be heated, at least two heating elements are provided and a temperature-sensitive switch arranged to be heated by the control heater is connected in series with one of the elements. Thus, when the outside temperature is above a predetermined minimum and the control heater is energized to reduce the maximum core temperature, the switch opens to de-energize its associated heating element. As shown, three core heating elements 2, 3, 4 are connected in parallel and are energized via a thermostatic switch 16 which receives heat from the core via a metallic heat conducting bridge 17. Elements 3 and 4 are in series with respective bimetal switches 7, 8 which are arranged to receive radiant heat from control heaters 11, 12 heat from the latter is conducted to switch 16 via metallic bridges 18a, 18b, 18. Heaters 11, 12 are respectively energized by the contacts 15b, 15c of a temperature senser 15 mounted on the outside of an exterior wall AM. In operation, both contacts 15b, 15c are closed at outside temperatures greater than 5 C., switches 7 and 8 are open and the core is heated to a relatively low final temperature by element 2 alone. At temperatures between - 10 and +5 C., only contact 15b is closed and the core is heated to an intermediate temperature by elements 2 and 4. Below - 10 C., both contacts 15b, 15c are open and the core is heated to a relatively higher temperature by all three elements.