Suction-actuated control system for whirlpool bath/spa installations

A suction-actuated control system and whirlpool bath/spa combination having a motor driving a recirculation pump for removing water from a tub through a suction path and for returning and reintroducing the water as pressurized jets and an actuatable electric switch in circuit with the motor, the system comprising:

• a pneumatically controllable actuator coupled to the electric switch for actuating the switch between a first position to complete an electric circuit with the motor and a second position to interrupt the electric circuit with the motor and having means to mechanically latch the switch in each of said first and second positions, said actuator successively actuating the switch between said first and second positions in response to successive first pneumatic signals, said actuator responsive to a second pneumatic signal different from said first pneumatic signal to cause the switch to assume its second position to interrupt the electric circuit with the motor;
• means, operable by a system user, to apply successive first pneumatic signals to said actuator to successively complete and interrupt the electric circuit;
• a transducer coupled to the suction path for detecting a pre-determined pressure in the suction path and for providing the second fluidic signal to said actuator to cause the switch to assume its second position.