Damper with override control

Details Damper with override control Damper with override control

1989-04-11

1990-03-27

Joyce, Harold

Automatic temperature and humidity regulation

Thermostatic

Expanding solid

98 4215, 98 4203, 236 492, F24F 1100

Patent

active

049110659

ABSTRACT:
A fire and smoke damper equipped with a thermal responsive electric switch for closing the damper responsive to the elevation of the ambient temperature above a first predetermined level. Control circuitry is provided for permitting selective override of the switch for opening the damper from a remote control panel so that toxic fumes and smoke may be vented through the damper. A second thermal responsive switch operable at a higher predetermined temperature is interposed in the control circuit to insure that the damper may not be opened by the override circuit in the event that such higher ambient temperature has been reached in the location of the damper.

REFERENCES:
patent: 4039123 (1977-08-01), Frankel
patent: 4432272 (1984-02-01), Van Becelaere
patent: 4463896 (1984-08-01), Schaus
Rixson-Firemark, Inc. brochure entitled, "Automatic Damper Operator Model FM-5590" (1972).

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