Solid state thermostatic control system for evaporative coolers

Details Solid state thermostatic control system for evaporative coolers Solid state thermostatic control system for evaporative coolers

1985-01-15

1986-04-08

Schwartz, Larry I.

Refrigeration

Automatic control

Gas-liquid contact cooler, fluid flow

62180, F28D 300, F25D 1700

Patent

active

045804036

ABSTRACT:
In order to provide a control system for an evaporative cooler which is simple to install correctly and which affords a high degree of safety in use, there is disclosed a circuit employing opto-isolators to switch power triacs which, in turn, control the flow of a-c power to the water pump motor and to the low and high speed fan motor windings. Logic means ensure that energization of the low and high speed fan motor windings is mutually exclusive. The electronic switching devices are selected to afford a high degree of electrical isolation between the thermostat and potentially lethal voltages. The system is housed in a molded fiberglass box for long-term use in a damp environment.

REFERENCES:
patent: 3398889 (1968-08-01), Bohannan
patent: 3464224 (1969-09-01), Swanson
patent: 3464225 (1969-09-01), Watrous et al.
patent: 3877243 (1975-04-01), Kramer
patent: 4232531 (1980-11-01), Manoan, Jr. et al.
patent: 4325225 (1982-04-01), Price

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