Patent ID: 6084218
Filing Date: 2000-07-04
Classification: F24H,G05D

Abstract:
A spa heater control circuit for controlling the flow of electrical power to a heater, the circuit comprising:at least one temperature sensor which produces a signal representative of the temperature of water within the heater;a high limit temperature safety shut off circuit coupled to receive the signal from said at least one temperature sensor, said high limit temperature safety shut off circuit havinga first switch mechanism which controls the application of electrical power to the heater, anda crowbar circuit which will cause said first switch mechanism to stop the flow of electrical power to said heater if the signal from said at least one temperature sensor indicates that the water within the heater has exceeded a predetermined temperature and which will not allow power to be applied to the heater until power to the high limit temperature safety shut off circuit has been turned off and then turned back on again.