Electronic circuit for controlling a heating or air-conditioning

Heat exchange – With alarm – indicator – signal – register – recorder – test or... – Remotely controlled inspection means

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Details

165 43, 236 36, 236 91G, 62158, 237 5, F28D 2100, F28F 2700

Patent

active

044187432

ABSTRACT:
An electronic circuit for controlling the heating or air conditioning apparatus in an automobile permits the capability of heating the vehicle without the heat surges which can occur after short periods of ignition turn off and permitting manual on-off control of the heating system even if the thermostat fails. A second circuit for controlling the device activating the valve controls the flow of heating or cooling medium independently of the ignition switch and contains a timer to keep the valve closed for a predetermined time after ignition switch-off. Two limit switches are also present for permitting the valve to be set at an open or closed position independently of both the ignition switch and the timer.

REFERENCES:
patent: 3796892 (1974-03-01), Stewart
patent: 3871443 (1975-03-01), Jones
patent: 4058255 (1977-11-01), Linder et al.
patent: 4142375 (1979-03-01), Abe et al.
patent: 4180234 (1979-12-01), Hertfelder
patent: 4189093 (1980-02-01), Schnaibel et al.
patent: 4262738 (1981-04-01), Kato et al.

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