Plural temperature level fluid heating system

Claim 2

The temperature control system as claimed in claim 1 in which said inlet temperature control means comprises first thermostatically operated switch means having a temperature sensing element disposed in said inlet and said switch means being connected in a series electrical circuit with said energizing means, said energizing means being electrically operated, said sensing element being operable on said first switch means to de-energize said energizing means when the inlet fluid temperature exceeds a predetermined temperature level to permit passage of said fluid through said heat exchanger and discharge of same from said outlet in unheated condition if the fluid at the inlet has already reached said predetermined temperature level.

Claim 3

The temperature control system as claimed in claim 3 in which said minimum outlet control means comprises second thermostatically operated switch means in series with said first thermostatically operated switch means, said second switch means having its thermostatic temperature sensing element disposed within said outlet and being responsive to open said electrical circuit at a predetermined minimum temperature level at the outlet.

Claim 4

The temperature control system as claimed in claim 4 in which said maximum outlet temperature control means comprises third thermostatically operated switch means arranged in parallel electrical relationship with said second switch means and override switch means in series with said third switch means, closing thereof maintaining said electrical circuit closed notwithstanding opening of said second switch means, said third switch means having its temperature sensing element disposed within said outlet and responsive to a maximum temperature level at the outlet.

Claim 5

The temperature control system as claimed in claim 5 in which said override switch means comprises a selectively operated switch.

Claim 6

The temperature control means system as claimed in claim 6 in which said switch is manually operable.

Claim 7

A multiple pool fluid heating system capable of providing heated fluid for at least two pools of fluid to maintain said pools at different relative temperature levels from a single fluid heater; comprising, a fluid heater having an inlet and outlet, heat exchanger means coupled between said inlet and outlet, means for supplying heat to the exterior of said heat exchanger and means for energizing said heating means, conduit means coupling the pair of pools to said fluid heater, inlet temperature control means connected in series electrical circuit with said energizing mEans and operable at a selected temperature level within a temperature level range, first and second outlet temperature level control means at the outlet, said first control means serially connected with said energizing means and operable at a selected minimum discharge temperature to de-energize said heating means and second control means operable at a selected maximum discharge temperature to de-energize said heating means and switch means for selectively coupling said second control means into parallel electrical circuit relationship with said first control means but in series circuit with said inlet temperature control means whereby to override said first control means when so coupled.

Claim 8

The system as claimed in claim 8 in which said inlet temperature control means and said first and second control means comprise thermostatically controlled switch means.

Claim 9

The system as claimed in claim 8 in which said selectively coupling means comprises switch means and said inlet temperature control means and said first and second control means is temperature responsive.