SPA CONTROL CIRCUIT

摘要

A spa control circuit (14) is provided for regulating a water circulation and heating system (12) in a spa or hot tub or the like. The control circuit comprises a thermostat circuit (44) and a high temperature limit circuit (50) both of which receive a temperature signal from a common temperature sensor (46). A safety circuit (82) responds to sensor failure to prevent operation of the circulation/heating system. A latching relay (74) ensures system reset in the same operational state following a power outage. An arc suppression circuit (56) substantially prevents arc damage to relay contacts subjected to frequent opening and closing in response to on-off cycling of the thermostat circuit. In a preferred form, the control circuit (14) components are mounted within a compact housing (22) having a heat transfer member in heat exchange relation with circulating spa water, whereby the spa water is used to prevent overheating of the control circuit components.