| 摘要 |
An exteriorly installed therapeutic spa has a water circulation loop, including an electric heater for heating the water, an electric motor-driven pump for circulating the water at low and high speeds and electric motor-operated blower for injecting air into the water. Control is effected by an in-house control panel within a residence, a spa side control unit mounted on the spa shell for access by the spa occupant and a main control panel at an equipment area. The control system incorporates a low voltage transformer and rectifier to provide low voltage DC. The spa side control unit utilizes a plurality of low voltage hermetically sealed switches under manual knob control, acting in parallel with in-house control panel low voltage switches. Low voltage relays responsive to low voltage switch operation control operation of the equipment within the equipment area under thermostat control with high voltage override manual switches at the main control panel. Vacation switches within the house and at the main control panel selectively disable at least the in-house switches and insures low flow velocity circulation of the water and heating of the same responsive to freeze thermostat switch closure.
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