WATER HEATER OF ENDORSEMENT WITH IONIZED IGNITION AND ELECTRONIC CONTROL OF TEMPERATURE, FOR SOLAR HEATERS OF THE TYPE THERMOSIPHON.

摘要

The backup water heater for solar water heaters of the thermosiphon type works by means of an electronic card that gives the order to ignite the heater when a bimetallic cable detects a temperature lower than 38°C and when a water supply, previously detected by a tank flow detector, exists. The backup water heater is attached to a cylindrical collector for transferring from about 85% to about 90% of the calorific power of the burner, which is gradually ignited by an electronic spark emitted by a spark plug that is connected to the electronic card, this latter element gives the signal to open the gas feed valve. Once the burner is lit, the current generated by the first spark plug is changed due to the ionization effect, thus changing the polarization of the current; said change of current is detected by another spark plug which sends a change-of-current signal to the electronic card. If said change-of-current signal is not detected by the electric card, the system is blocked and react ivated after 2 minutes, if no signal is detected after two more attempts the system will be blocked by the card and a visual signal indicating a system error will be shown. If the water heater works correctly, the card will emit a visual signal. Once the bimetallic cable detects a temperature higher than 50°C the card will stop the operation of the water heater until a new temperature cycle is reactivated.