# US 5,341,986 A · Control circuit and device for humidifying air in a heating system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,341,986 A - Document ID: US5341986A - Status: Granted - Kind: A - Application number: 08/140,666 - Filed: 1993-10-21 - Granted: 1994-08-30 - Earliest claimed: 1993-10-21 - Inventors: Mark A. Galba; Gus N. Gallas - Web page: https://patentgrep.com/patent/US5341986A ## CPC - F24F 6/14: using nozzles - Y02B 30/54: Free-cooling systems - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A humidification system for use with a heating unit to modify and maintain a predetermined level of humidity in an enclosed space using a pulse circuit for energizing a solenoid valve to allow pulsed output of water from a misting nozzle, The system operating the pulse circuit in a plurality of modes to provide humidity to the enclosed space, ## Claims ### Claim 1 A control circuit for a heating and humidification system which system includes a furnace, a fan, a thermostat, and a humidistat, said control circuit including: input means for receiving a humidity increase signal from said humidistat; pulse means for providing a pulsed output of water in response to said humidity increase signal; control means adapted to be connected to said input means, said pulse means, the fan, and the furnace for controlling and energizing said pulse means in response to said humidity increase signal, said control means having a unison mode operable to energize said pulse means during the energization of the furnace and fan, a by-pass mode operable to energize said pulse means and the fan during the deenergization of the furnace, and a stand-by mode operable during said by-pass mode to deenergize said pulse means and the fan and to energize the furnace. ### Claim 2 (depends on 1) A control circuit as in claim 1 wherein said pulse means includes a misting nozzle and said pulse means further includes a solenoid valve adapted to be connected between a water source and said misting nozzle, said pulse means operable to open and close said solenoid valve for generating said pulsed output of water. ### Claim 3 (depends on 2) A control circuit as in claim 2 wherein said pulse means further includes a filter located between the water source and said solenoid valve. ### Claim 4 (depends on 1) A control circuit as in claim 1 wherein said unison mode is operative, after receiving said humidity increase signal from the humidistat and a temperature increase signal from the thermostat, to energize the furnace and the fan before energizing said pulse means. ### Claim 5 (depends on 1) A control circuit as in claim 1 wherein said by-pass mode is operative, after receiving said humidity increase signal from the humidistat and when a temperature increase signal from the thermostat is not detected, to energize the fan and said pulse means. ### Claim 6 (depends on 1) A control circuit as in claim 1 wherein said stand-by mode is operative, after receiving a temperature increase signal from the thermostat during the operation of said by-pass mode, to deenergize the fan and the pulse means and to energize the furnace. ### Claim 7 (depends on 1) A control circuit as in claim 1 including timer means associated with said pulse means and adapted to energize and deenergize said pulse means for a predetermined unit of time during operation of said unison and by-pass modes. ### Claim 8 (depends on 7) A control circuit as in claim 7 in which said timer means is adjustable to allow an operator to vary the units of time during which said pulse means is energized or deenergized. ### Claim 9 (depends on 1) A control circuit as in claim 1 including a gain means for locking said control means in said unison mode. ### Claim 10 A humidification system adapted for installation in conjunction with a heating unit and a fan, said system including, a humidifier adapted to emit moisture into a ductwork system; a humidistat adapted to sense the relative humidity present in the air and to transmit a humidity increase signal when said humidity falls below a preselected value; a first electrical circuit connecting said humidistat and said humidifier whereby when said humidity falls below said preselected value, said first circuit energizes said humidifier; and means for controlling said first circuit, the fan and the heating unit, said control means operative in a first mode to energize said humidifier during the operation of the fan and heating unit, operative in a second mode to energize the fan and said humidifier while the heating unit is idle, and operative in a third mode for interrupting operation of said second mode so as to energize the heating unit and to deenergize the fan and said humidifier. ### Claim 11 (depends on 10) A humidification system according to claim 10 wherein said humidifier includes means for providing a pulsed mist of liquid to air flowing from the heating unit, said pulse means being connected to said control means, said pulse means having a misting nozzle and said humidification system further including a solenoid valve interposed between a source of liquid and said misting nozzle, said control means adapted to energize said pulse means to open and close said solenoid valve to allow said liquid to pass through said misting nozzle. ### Claim 12 (depends on 11) A humidification system according to claim 11 further including filter means connected between the liquid source and said solenoid valve, said filter means operative to filter liquid transmitted to said solenoid valve. ### Claim 13 (depends on 10) A humidification system according to claim 10 including timer means associated with said humidifier adapted to energize and deenergize said humidifier for a predetermined unit of time during operation of said first and second modes. ### Claim 14 (depends on 13) A humidification system according to claim 13 in which said timer means is adjustable to allow an operator to vary the humidifier energization and deenergization times between predetermined values. ### Claim 15 (depends on 10) A humidification system according to claim 10 including a gain means for locking said control means in said first mode.